Imported Tcl 8.6.9

Merge pull request #4 from csabella/8.6.8-tcl
Import Tcl-code 8.6.8
2018-12-11 10:07:57 -08:00 · 2018-02-23 08:20:05 -08:00 · 2018-02-22 14:28:00 -05:00
965 changed files with 559929 additions and 25011 deletions
--- a/2
+++ b/2
@@ -1,6 +1,6 @@
 A NOTE ON THE CHANGELOG:
 Starting in early 2011, Tcl source code has been under the management of
-fossil, hosted at http://core.tcl.tk/tcl/ .  Fossil presents a "Timeline"
+fossil, hosted at https://core.tcl-lang.org/tcl/ .  Fossil presents a "Timeline"
 view of changes made that is superior in every way to a hand edited log file.
 Because of this, many Tcl developers are now out of the habit of maintaining
 this log file.  You may still find useful things in it, but the Timeline is
--- a/ChangeLog.2000
+++ b/ChangeLog.2000
@@ -414,7 +414,7 @@
 	Tcl_IsChannelExisting, and Tcl_ClearChannelHandlers to conform to the
 	new stacked channel implementation. Their stub slots were also moved
 	to give preference to the new 8.3.2 stub functions. This will cause an
-	incompatability with 8.4a1 only.
+	incompatibility with 8.4a1 only.
 	(StopCopy): fixed a bug introduced by a partial fix in 8.3.2 that
 	didn't set nonBlocking correctly when resetting the flags for the
 	write side. [Bug: 6261]
--- a/ChangeLog.2002
+++ b/ChangeLog.2002
@@ -847,7 +847,7 @@
 	exit.
 	* tests/exec.test: marked exec-18.1 unixOnly until the Windows
-	incompatability (in the test, not the core) can be resolved.
+	incompatibility (in the test, not the core) can be resolved.
 	* tests/http.test (http-3.11): added close $fp that was causing an
 	error on Windows because the file was not closed before deleting.
@@ -3642,7 +3642,7 @@
 	* compat/strtoll.c (strtoll):
 	* compat/strtoull.c (strtoull):
 	* unix/tclUnixPort.h:
-	* win/tclWinPort.h: Const-ing 64-bit compatability declarations. Note
+	* win/tclWinPort.h: Const-ing 64-bit compatibility declarations. Note
 	that the return pointer is non-const because it is entirely legal for
 	the functions to be called from somewhere that owns the string being
 	passed. Fixes problem reported by Larry Virden.
@@ -3779,7 +3779,7 @@
 	There are a lot of changes from this TIP, so please see
 	http://purl.org/tcl/tip/72.html for discussion of
-	backward-compatability issues, but the main ones modifications are in:
+	backward-compatibility issues, but the main ones modifications are in:
 	* generic/tcl.h: New types.
 	* generic/tcl.decls: New public functions.
--- a/ChangeLog.2003
+++ b/ChangeLog.2003
@@ -947,7 +947,7 @@
 	declarations match and will end up using the declarations in the
 	public code from now on because of #include ordering. Keeping the old
 	declarations in tclInt.decls; there's no need to gratuitously break
-	compatability for those extensions which are already clients of the
+	compatibility for those extensions which are already clients of the
 	namespace code.
 2003-08-23  Zoran Vasiljevic  <zoran@archiwrae.com>
@@ -1278,7 +1278,7 @@
 	* generic/tclVar.c (Tcl_ArrayObjCmd, TclArraySet): Made [array get]
 	and [array set] work with dictionaries, producing them and consuming
-	them. Note that for compatability reasons, you will never get a dict
+	them. Note that for compatibility reasons, you will never get a dict
 	from feeding a string literal to [array set] since that alters the
 	trace behaviour of "multi-key" sets. [Bug 759935]
--- a/ChangeLog.2004
+++ b/ChangeLog.2004
@@ -1356,7 +1356,7 @@
 2004-10-07  Donal K. Fellows  <donal.k.fellows@man.ac.uk>
 	* *.3: Convert CONST to const and VOID to void so we document how
-	people should actually use the Tcl API and not the compatability hacks
+	people should actually use the Tcl API and not the compatibility hacks
 	that it has to have.
 	* doc/man.macros, *.3: Update .AS macro so it can know how wide to
--- a/24
+++ b/24
@@ -1,5 +1,5 @@
 README:  Tcl
-    This is the Tcl 8.6.6 source distribution.
+    This is the Tcl 8.6.9 source distribution.
 	http://sourceforge.net/projects/tcl/files/Tcl/
    You can get any source release of Tcl from the URL above.
@@ -29,7 +29,7 @@ Tcl is maintained, enhanced, and distributed freely by the Tcl community.
 Source code development and tracking of bug reports and feature requests
 takes place at:
-	http://core.tcl.tk/
+	http://core.tcl-lang.org/
 Tcl/Tk release and mailing list services are hosted by SourceForge:
@@ -37,7 +37,7 @@ Tcl/Tk release and mailing list services are hosted by SourceForge:
 with the Tcl Developer Xchange hosted at:
-	http://www.tcl.tk/
+	http://www.tcl-lang.org/
 Tcl is a freely available open source package.  You can do virtually
 anything you like with it, such as modifying it, redistributing it,
@@ -49,21 +49,21 @@ and selling it either in whole or in part.  See the file
 Extensive documentation is available at our website.
 The home page for this release, including new features, is
-	http://www.tcl.tk/software/tcltk/8.6.html
+	http://www.tcl-lang.org/software/tcltk/8.6.html
 Detailed release notes can be found at the file distributions page
 by clicking on the relevant version.
 	http://sourceforge.net/projects/tcl/files/Tcl/
 Information about Tcl itself can be found at
-	http://www.tcl.tk/about/
+	http://www.tcl-lang.org/about/
 There have been many Tcl books on the market.  Many are mentioned in the Wiki:
-	http://wiki.tcl.tk/_/ref?N=25206
+	http://wiki.tcl-lang.org/_/ref?N=25206
 To view the complete set of reference manual entries for Tcl 8.6 online,
 visit the URL:
-	http://www.tcl.tk/man/tcl8.6/
+	http://www.tcl-lang.org/man/tcl8.6/
 2a. Unix Documentation
 ----------------------
@@ -101,7 +101,7 @@ There are brief notes in the unix/README, win/README, and macosx/README about
 compiling on these different platforms.  There is additional information
 about building Tcl from sources at
-	http://www.tcl.tk/doc/howto/compile.html
+	http://www.tcl-lang.org/doc/howto/compile.html
 4. Development tools
 ---------------------------
@@ -127,7 +127,7 @@ see the "Support and bug fixes" section below.
 A Wiki-based open community site covering all aspects of Tcl/Tk is at:
-	http://wiki.tcl.tk/
+	http://wiki.tcl-lang.org/
 It is dedicated to the Tcl programming language and its extensions.  A
 wealth of useful information can be found there.  It contains code
@@ -153,7 +153,7 @@ We are very interested in receiving bug reports, patches, and suggestions
 for improvements.  We prefer that you send this information to us as
 tickets entered into our tracker at:
-	http://core.tcl.tk/tcl/reportlist
+	http://core.tcl-lang.org/tcl/reportlist
 We will log and follow-up on each bug, although we cannot promise a
 specific turn-around time.  Enhancements may take longer and may not happen
@@ -169,13 +169,13 @@ questions for which no one else is likely to know the answer.  In addition,
 see the following Web site for links to other organizations that offer
 Tcl/Tk training:
-	http://wiki.tcl.tk/training
+	http://wiki.tcl-lang.org/training
 9. Tracking Development
 -----------------------
 Tcl is developed in public.  To keep an eye on how Tcl is changing, see
-	http://core.tcl.tk/
+	http://core.tcl-lang.org/
 10. Thank You
 -------------
--- a/196
+++ b/196
@@ -8698,3 +8698,199 @@ improvements to regexp engine from Postgres (lane,porter,fellows,seltenreich)
 2016-07-20 tzdata updated to Olson's tzdata2016f (venkat)
 --- Released 8.6.6, July 27, 2016 --- http://core.tcl.tk/tcl/ for details
 2016-09-07 (bug)[c09edf] Bad caching with  custom resolver (neumann,nijtmans)
 2016-09-07 (bug)[4dbdd9] Memleak in test var-8.3 (mr_calvin,porter)
 2016-10-03 (bug)[2bf561] Allow empty command as alias target (yorick,nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2016-10-04 (bug)[4d5ae7] Crash in async connects host no address (gahr,fellows)
 2016-10-08 (bug)[838e99] treat application/xml as text (gahr,fellows)
 => http 2.8.10
 2016-10-11 (bug)[3cc1d9] Thread finalization crash in zippy (neumann)
 2016-10-12 (bug)[be003d] Fix [scan 0x1 %b], [scan 0x1 %o] (porter)
 2016-10-14 (bug)[eb6b68] Fix stringComp-14.5 (porter)
 2016-10-30 (bug)[b26e38] Fix zlib-7.8 (fellows)
 2016-10-30 (bug)[1ae129] Fix memleak in [history] destruction (fellows)
 2016-11-04 (feature) Provisional Tcl 9 support in msgcat and tcltest (nijtmans)
 => msgcat 1.6.1
 => tcltest 2.4.1
 2016-11-04 (bug)[824752] Crash in Tcl_ListObjReplace() (gahr,porter)
 2016-11-11 (bug)[79614f] invalidate VFS mounts on sytem encoding change (yorick)
 2016-11-14 OSX: End panic() as legacy support macro; system conflicts (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2016-11-15 (bug) TclOO fix stops crash mixing Itcl and snit (fellows)
 2016-11-17 (update) Reconcile libtommath updates; purge unused files (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2017-01-09 (bug)[b87ad7] Repair drifts in timer clock (sebres)
 2017-01-17 (update) => zlib 1.2.11 (nijtmans)
 2017-01-31 (bug)[39f630] Revise Tcl_LinkVar to tolerate some prefixes (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2017-02-01 (bug)[d0f7ba] Improper NAN optimization. expr-22.1[01] (aspect)
 2017-02-26 (bug)[25842c] zlib stream finalization (aspect)
 2017-03-07 (deprecate) Remove unmaintained makefile.bc file (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2017-03-14 (enhancement) [clock] and [encoding] are now ensembles (kenny)
 2017-03-15 (enhancement) several [clock] subcommands bytecoded (kenny)
 2017-03-23 tzdata updated to Olson's tzdata2017b (jima)
 2017-03-29 (bug)[900cb0] Fix OO unexport introspection (napier)
 2017-04-12 (bug)[42202b] Nesting imbalance in coro injection (nadkarni,sebres)
 2017-04-18 (bug)[bc4322] http package support for safe interps (nash,nijtmans)
 2017-04-28 (bug)[f34cf8] [file join a //b] => /b (neumann,porter)
 2017-05-01 (bug)[8bd13f] Windows threads and pipes (sebres,nijtmans)
 2017-05-01 (bug)[f9fe90] [file join //a b] EIAS violation (aspect,porter)
 2017-05-04 (bug) Make test filesystem-1.52 pass on Windows (nijtmans)
 2017-05-05 (bug)[601522] [binary] field spec overflow -> segfault (porter)
 2017-05-08 (bug)[6ca52a] http memleak handling keep-alive (aspect,nijtmans)
 => http 2.8.11
 2017-05-29 (bug)[a3fb33] crash in [lsort] on long lists (sebres)
 2017-06-05 (bug)[67aa9a] Tcl_UtfToUniChar() revised handling invalid UTF-8 (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2017-06-08 (bug)[2738427] Tcl_NumUtfChars() corner case utf-4.9 (nijtmans)
 2017-06-22 (update) Update Unicode data to 10.0 (nijtmans)
        *** POTENTIAL INCOMPATIBILITY ***
 2017-06-22 (TIP 473) Let [oo::copy] specify target namespace (fellows)
 2017-06-26 (bug)[46f801] Repair autoloader fragility (porter)
 2017-07-06 (bug)[adb198] Plug memleak in TclJoinPath (sebres,porter)
 2017-07-17 (bug)[fb2208] Repeatable tclIndex generation (wiedemann,nijtmans)
 --- Released 8.6.7, August 9, 2017 --- http://core.tcl.tk/tcl/ for details
 2017-08-10 [array names -regexp] supports backrefs (goth)
 2017-08-10 Fix gcc build failures due to #pragma placement (cassoff,fellows)
 2017-08-29 (bug)[b50fb2] exec redir append stdout and stderr to file (coulter)
 2017-08-31 (bug)[2a9465] http state 100 continue handling broken (oehlmann)
 => http 2.8.12
 2017-09-02 (bug)[0e4d88] replace command, delete trace kills namespace (porter)
 2017-10-19 (bug)[1a5655] [info * methods] includes mixins (fellows)
 2017-10-23 tzdata updated to Olson's tzdata2017c (jima)
 2017-10-24 (bug)[fc1409] segfault in method cloning, oo-15.15 (coulter,fellows)
 2017-11-03 (bug)[6f2f83] More robust [load] for ReactOS (werner)
 2017-11-08 (bug)[3298012] Stop crash when hash tables overflow 32 bits (porter)
 2017-11-14 (bug)[5d6de6] Close failing case of [package prefer stable] (kupries)
 2017-11-17 (bug)[fab924] Fix misleading [load] message on Windows (oehlmann)
 2017-12-05 (bug)[4f6a1e] Crash when ensemble map and list are same (sebres)
 2017-12-06 (bug)[ce3a21] file normalize failure when tail is empty (porter)
 2017-12-08 (new)[TIP 477] nmake build system reform (nadkarni)
 2017-12-19 (bug)[586e71] EvalObjv exception handling at level #0 (sebres,porter)
 --- Released 8.6.8, December 22, 2017 --- http://core.tcl.tk/tcl/ for details
 2018-02-11 (enhance) stop blocking conversion of object to/from class (coulter)
 2018-02-12 (enhance) NR-enable [package require] (coulter)
 2018-02-14 (bug)[9fd5c6] crash in object deletion, test oo-11.5 (coulter)
 2018-02-14 (bug)[3c32a3] crash deleting object with class mixed in (coulter)
 2018-02-15 (platform) stop using -lieee, removed from glibc-2.27 (porter)
 ***POTENTIAL INCOMPATIBILITY for math programs that embed Tcl***
 2018-02-23 (bug)[8e6a9a] bad binary [string match], test string-11.55 (porter)
 2018-03-05 (bug)[1873ea] repair multi-thread std channel init (sebres)
 2018-03-09 (bug)[db36fa] broken bytecode for index values (porter)
 2018-03-13 (bug) broken compiled [string replace], test string-14.19 (porter)
 2018-03-14 (bug) [string trim*] engine crashed on invalid UTF (sebres)
 2018-04-17 (bug) missing trace in compiled [array set], test var-20.11 (porter)
 2018-04-22 (bug)[46a241] crash in unset array with search, var-13.[23] (goth)
 2018-04-30 (bug)[27b682] race made [file delete] raise "no such file" (sebres)
 2018-06-04 (bug)[925643] 32/64 cleanup of filesystem DIR operations (sebres)
 2018-06-18 (bug) leaks in TclSetEnv and env cache (coulter)
 2018-06-24 (bug)[3592747] [yieldto] dying namespace, tailcall-14.1 (coulter)
 2018-07-09 (bug)[270f78] race in [file mkdir] (sebres)
 2018-07-12 (bug)[3f7af0] [file delete] raised "permission denied" (sebres)
 2018-07-26 (bug)[d051b7] overflow crash in [format] (sebres)
 2018-08-29 revised quoting of [exec] args in generated command line (sebres)
 ***POTENTIAL INCOMPATIBILITY***
 2018-09-20 HTTP Keep-Alive with pipelined requests (nash)
 => http 2.9.0
 2018-09-27 (new)[TIP 505] [lreplace] accepts all out of range indices (porter)
 2018-10-04 (bug) Prevent crash from NULL keyName (nijtmans)
 => registry 1.3.3
 2018-10-26 (enhance) advance dde version (nijtmans)
 => dde 1.4.1
 2018-10-27 tzdata updated to Olson's tzdata2018g (jima)
 2018-10-29 Update tcltest package for Travis support (fellows)
 => tcltest 2.5.0
 2018-11-09 (bug)[35a8f1] overlong string length of some lists (owens)
 2018-11-16 (bug)[00d04c] Repair [binary encode base64] (sebres)
 - Released 8.6.9, November 16, 2018 - details at http://core.tcl-lang.org/tcl/ -
--- a/compat/fixstrtod.c
+++ b/compat/fixstrtod.c
@@ -1,36 +0,0 @@
 /*
 * fixstrtod.c --
 *
 *	Source code for the "fixstrtod" procedure.  This procedure is
 *	used in place of strtod under Solaris 2.4, in order to fix
 *	a bug where the "end" pointer gets set incorrectly.
 *
 * Copyright (c) 1995 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
 #include <stdio.h>
 #undef strtod
 /*
 * Declare strtod explicitly rather than including stdlib.h, since in
 * somes systems (e.g. SunOS 4.1.4) stdlib.h doesn't declare strtod.
 */
 extern double strtod(char *, char **);
 double
 fixstrtod(
    char *string,
    char **endPtr)
 {
    double d;
    d = strtod(string, endPtr);
    if ((endPtr != NULL) && (*endPtr != string) && ((*endPtr)[-1] == 0)) {
 	*endPtr -= 1;
    }
    return d;
 }
--- a/compat/stdlib.h
+++ b/compat/stdlib.h
@@ -29,7 +29,6 @@ extern char *		malloc(unsigned int numBytes);
 extern void		qsort(void *base, int n, int size, int (*compar)(
 			    const void *element1, const void *element2));
 extern char *		realloc(char *ptr, unsigned int numBytes);
 extern double		strtod(const char *string, char **endPtr);
 extern long		strtol(const char *string, char **endPtr, int base);
 extern unsigned long	strtoul(const char *string, char **endPtr, int base);
--- a/compat/strtod.c
+++ b/compat/strtod.c
@@ -1,252 +0,0 @@
 /*
 * strtod.c --
 *
 *	Source code for the "strtod" library procedure.
 *
 * Copyright (c) 1988-1993 The Regents of the University of California.
 * Copyright (c) 1994 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */
 #include "tclInt.h"
 #ifndef TRUE
 #define TRUE 1
 #define FALSE 0
 #endif
 #ifndef NULL
 #define NULL 0
 #endif
 static const int maxExponent = 511;	/* Largest possible base 10 exponent.  Any
 				 * exponent larger than this will already
 				 * produce underflow or overflow, so there's
 				 * no need to worry about additional digits.
 				 */
 static const double powersOf10[] = {	/* Table giving binary powers of 10.  Entry */
    10.,			/* is 10^2^i.  Used to convert decimal */
    100.,			/* exponents into floating-point numbers. */
    1.0e4,
    1.0e8,
    1.0e16,
    1.0e32,
    1.0e64,
    1.0e128,
    1.0e256
 };
 /*
 *----------------------------------------------------------------------
 *
 * strtod --
 *
 *	This procedure converts a floating-point number from an ASCII
 *	decimal representation to internal double-precision format.
 *
 * Results:
 *	The return value is the double-precision floating-point
 *	representation of the characters in string.  If endPtr isn't
 *	NULL, then *endPtr is filled in with the address of the
 *	next character after the last one that was part of the
 *	floating-point number.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */
 double
 strtod(
    const char *string,		/* A decimal ASCII floating-point number,
 				 * optionally preceded by white space. Must
 				 * have form "-I.FE-X", where I is the integer
 				 * part of the mantissa, F is the fractional
 				 * part of the mantissa, and X is the
 				 * exponent. Either of the signs may be "+",
 				 * "-", or omitted. Either I or F may be
 				 * omitted, or both. The decimal point isn't
 				 * necessary unless F is present. The "E" may
 				 * actually be an "e". E and X may both be
 				 * omitted (but not just one). */
    char **endPtr)		/* If non-NULL, store terminating character's
 				 * address here. */
 {
    int sign, expSign = FALSE;
    double fraction, dblExp;
    const double *d;
    register const char *p;
    register int c;
    int exp = 0;		/* Exponent read from "EX" field. */
    int fracExp = 0;		/* Exponent that derives from the fractional
 				 * part. Under normal circumstatnces, it is
 				 * the negative of the number of digits in F.
 				 * However, if I is very long, the last digits
 				 * of I get dropped (otherwise a long I with a
 				 * large negative exponent could cause an
 				 * unnecessary overflow on I alone). In this
 				 * case, fracExp is incremented one for each
 				 * dropped digit. */
    int mantSize;		/* Number of digits in mantissa. */
    int decPt;			/* Number of mantissa digits BEFORE decimal
 				 * point. */
    const char *pExp;		/* Temporarily holds location of exponent in
 				 * string. */
    /*
     * Strip off leading blanks and check for a sign.
     */
    p = string;
    while (isspace(UCHAR(*p))) {
 	p += 1;
    }
    if (*p == '-') {
 	sign = TRUE;
 	p += 1;
    } else {
 	if (*p == '+') {
 	    p += 1;
 	}
 	sign = FALSE;
    }
    /*
     * Count the number of digits in the mantissa (including the decimal
     * point), and also locate the decimal point.
     */
    decPt = -1;
    for (mantSize = 0; ; mantSize += 1)
    {
 	c = *p;
 	if (!isdigit(c)) {
 	    if ((c != '.') || (decPt >= 0)) {
 		break;
 	    }
 	    decPt = mantSize;
 	}
 	p += 1;
    }
    /*
     * Now suck up the digits in the mantissa. Use two integers to collect 9
     * digits each (this is faster than using floating-point). If the mantissa
     * has more than 18 digits, ignore the extras, since they can't affect the
     * value anyway.
     */
    pExp  = p;
    p -= mantSize;
    if (decPt < 0) {
 	decPt = mantSize;
    } else {
 	mantSize -= 1;		/* One of the digits was the point. */
    }
    if (mantSize > 18) {
 	fracExp = decPt - 18;
 	mantSize = 18;
    } else {
 	fracExp = decPt - mantSize;
    }
    if (mantSize == 0) {
 	fraction = 0.0;
 	p = string;
 	goto done;
    } else {
 	int frac1, frac2;
 	frac1 = 0;
 	for ( ; mantSize > 9; mantSize -= 1) {
 	    c = *p;
 	    p += 1;
 	    if (c == '.') {
 		c = *p;
 		p += 1;
 	    }
 	    frac1 = 10*frac1 + (c - '0');
 	}
 	frac2 = 0;
 	for (; mantSize > 0; mantSize -= 1) {
 	    c = *p;
 	    p += 1;
 	    if (c == '.') {
 		c = *p;
 		p += 1;
 	    }
 	    frac2 = 10*frac2 + (c - '0');
 	}
 	fraction = (1.0e9 * frac1) + frac2;
    }
    /*
     * Skim off the exponent.
     */
    p = pExp;
    if ((*p == 'E') || (*p == 'e')) {
 	p += 1;
 	if (*p == '-') {
 	    expSign = TRUE;
 	    p += 1;
 	} else {
 	    if (*p == '+') {
 		p += 1;
 	    }
 	    expSign = FALSE;
 	}
 	if (!isdigit(UCHAR(*p))) {
 	    p = pExp;
 	    goto done;
 	}
 	while (isdigit(UCHAR(*p))) {
 	    exp = exp * 10 + (*p - '0');
 	    p += 1;
 	}
    }
    if (expSign) {
 	exp = fracExp - exp;
    } else {
 	exp = fracExp + exp;
    }
    /*
     * Generate a floating-point number that represents the exponent. Do this
     * by processing the exponent one bit at a time to combine many powers of
     * 2 of 10. Then combine the exponent with the fraction.
     */
    if (exp < 0) {
 	expSign = TRUE;
 	exp = -exp;
    } else {
 	expSign = FALSE;
    }
    if (exp > maxExponent) {
 	exp = maxExponent;
 	errno = ERANGE;
    }
    dblExp = 1.0;
    for (d = powersOf10; exp != 0; exp >>= 1, ++d) {
 	if (exp & 01) {
 	    dblExp *= *d;
 	}
    }
    if (expSign) {
 	fraction /= dblExp;
    } else {
 	fraction *= dblExp;
    }
  done:
    if (endPtr != NULL) {
 	*endPtr = (char *) p;
    }
    if (sign) {
 	return -fraction;
    }
    return fraction;
 }
--- a/compat/zlib/CMakeLists.txt
+++ b/compat/zlib/CMakeLists.txt
@@ -3,7 +3,7 @@ set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS ON)
 project(zlib C)
-set(VERSION "1.2.8")
+set(VERSION "1.2.11")
 option(ASM686 "Enable building i686 assembly implementation")
 option(AMD64 "Enable building amd64 assembly implementation")
--- a/compat/zlib/ChangeLog
+++ b/compat/zlib/ChangeLog
@@ -1,10 +1,53 @@
                ChangeLog file for zlib
 Changes in 1.2.11 (15 Jan 2017)
 - Fix deflate stored bug when pulling last block from window
 - Permit immediate deflateParams changes before any deflate input
 Changes in 1.2.10 (2 Jan 2017)
 - Avoid warnings on snprintf() return value
 - Fix bug in deflate_stored() for zero-length input
 - Fix bug in gzwrite.c that produced corrupt gzip files
 - Remove files to be installed before copying them in Makefile.in
 - Add warnings when compiling with assembler code
 Changes in 1.2.9 (31 Dec 2016)
 - Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
 - Improve contrib/blast to return unused bytes
 - Assure that gzoffset() is correct when appending
 - Improve compress() and uncompress() to support large lengths
 - Fix bug in test/example.c where error code not saved
 - Remedy Coverity warning [Randers-Pehrson]
 - Improve speed of gzprintf() in transparent mode
 - Fix inflateInit2() bug when windowBits is 16 or 32
 - Change DEBUG macro to ZLIB_DEBUG
 - Avoid uninitialized access by gzclose_w()
 - Allow building zlib outside of the source directory
 - Fix bug that accepted invalid zlib header when windowBits is zero
 - Fix gzseek() problem on MinGW due to buggy _lseeki64 there
 - Loop on write() calls in gzwrite.c in case of non-blocking I/O
 - Add --warn (-w) option to ./configure for more compiler warnings
 - Reject a window size of 256 bytes if not using the zlib wrapper
 - Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
 - Add --debug (-d) option to ./configure to define ZLIB_DEBUG
 - Fix bugs in creating a very large gzip header
 - Add uncompress2() function, which returns the input size used
 - Assure that deflateParams() will not switch functions mid-block
 - Dramatically speed up deflation for level 0 (storing)
 - Add gzfread(), duplicating the interface of fread()
 - Add gzfwrite(), duplicating the interface of fwrite()
 - Add deflateGetDictionary() function
 - Use snprintf() for later versions of Microsoft C
 - Fix *Init macros to use z_ prefix when requested
 - Replace as400 with os400 for OS/400 support [Monnerat]
 - Add crc32_z() and adler32_z() functions with size_t lengths
 - Update Visual Studio project files [AraHaan]
 Changes in 1.2.8 (28 Apr 2013)
 - Update contrib/minizip/iowin32.c for Windows RT [Vollant]
 - Do not force Z_CONST for C++
- Clean up contrib/vstudio [Ro<EFBFBD>]
+- Clean up contrib/vstudio [Roß]
 - Correct spelling error in zlib.h
 - Fix mixed line endings in contrib/vstudio
@@ -34,7 +77,7 @@ Changes in 1.2.7.1 (24 Mar 2013)
 - Clean up the usage of z_const and respect const usage within zlib
 - Clean up examples/gzlog.[ch] comparisons of different types
 - Avoid shift equal to bits in type (caused endless loop)
- Fix unintialized value bug in gzputc() introduced by const patches
+- Fix uninitialized value bug in gzputc() introduced by const patches
 - Fix memory allocation error in examples/zran.c [Nor]
 - Fix bug where gzopen(), gzclose() would write an empty file
 - Fix bug in gzclose() when gzwrite() runs out of memory
@@ -194,7 +237,7 @@ Changes in 1.2.5.2 (17 Dec 2011)
 - Add a transparent write mode to gzopen() when 'T' is in the mode
 - Update python link in zlib man page
 - Get inffixed.h and MAKEFIXED result to match
- Add a ./config --solo option to make zlib subset with no libary use
+- Add a ./config --solo option to make zlib subset with no library use
 - Add undocumented inflateResetKeep() function for CAB file decoding
 - Add --cover option to ./configure for gcc coverage testing
 - Add #define ZLIB_CONST option to use const in the z_stream interface
@@ -564,7 +607,7 @@ Changes in 1.2.3.1 (16 August 2006)
 - Update make_vms.com [Zinser]
 - Use -fPIC for shared build in configure [Teredesai, Nicholson]
 - Use only major version number for libz.so on IRIX and OSF1 [Reinholdtsen]
- Use fdopen() (not _fdopen()) for Interix in zutil.h [B<EFBFBD>ck]
+- Use fdopen() (not _fdopen()) for Interix in zutil.h [Bäck]
 - Add some FAQ entries about the contrib directory
 - Update the MVS question in the FAQ
 - Avoid extraneous reads after EOF in gzio.c [Brown]
@@ -1178,7 +1221,7 @@ Changes in 1.0.6 (19 Jan 1998)
        386 asm code replacing longest_match().
   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
        A C++ I/O streams interface to the zlib gz* functions
-   contrib/iostream2/  by Tyge L<EFBFBD>vset <Tyge.Lovset@cmr.no>
+   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
        Another C++ I/O streams interface
   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
        A very simple tar.gz file extractor using zlib
@@ -1267,7 +1310,7 @@ Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
 - fix array overlay in deflate.c which sometimes caused bad compressed data
 - fix inflate bug with empty stored block
 - fix MSDOS medium model which was broken in 0.99
- fix deflateParams() which could generated bad compressed data.
+- fix deflateParams() which could generate bad compressed data.
 - Bytef is define'd instead of typedef'ed (work around Borland bug)
 - added an INDEX file
 - new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
--- a/compat/zlib/Makefile.in
+++ b/compat/zlib/Makefile.in
@@ -1,5 +1,5 @@
 # Makefile for zlib
-# Copyright (C) 1995-2013 Jean-loup Gailly, Mark Adler
+# Copyright (C) 1995-2017 Jean-loup Gailly, Mark Adler
 # For conditions of distribution and use, see copyright notice in zlib.h
 # To compile and test, type:
@@ -20,7 +20,7 @@ CC=cc
 CFLAGS=-O
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DDEBUG
+#CFLAGS=-g -DZLIB_DEBUG
 #CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
 #           -Wstrict-prototypes -Wmissing-prototypes
@@ -32,7 +32,7 @@ CPP=$(CC) -E
 STATICLIB=libz.a
 SHAREDLIB=libz.so
-SHAREDLIBV=libz.so.1.2.8
+SHAREDLIBV=libz.so.1.2.11
 SHAREDLIBM=libz.so.1
 LIBS=$(STATICLIB) $(SHAREDLIBV)
@@ -53,6 +53,9 @@ includedir = ${prefix}/include
 mandir = ${prefix}/share/man
 man3dir = ${mandir}/man3
 pkgconfigdir = ${libdir}/pkgconfig
 SRCDIR=
 ZINC=
 ZINCOUT=-I.
 OBJZ = adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o
 OBJG = compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o
@@ -113,8 +116,8 @@ test64: all64
 	fi; \
 	rm -f $$TMP64
-infcover.o: test/infcover.c zlib.h zconf.h
+infcover.o: $(SRCDIR)test/infcover.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -c -o $@ test/infcover.c
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/infcover.c
 infcover: infcover.o libz.a
 	$(CC) $(CFLAGS) -o $@ infcover.o libz.a
@@ -140,24 +143,140 @@ match.lo: match.S
 	mv _match.o match.lo
 	rm -f _match.s
-example.o: test/example.c zlib.h zconf.h
+example.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -c -o $@ test/example.c
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/example.c
-minigzip.o: test/minigzip.c zlib.h zconf.h
+minigzip.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -c -o $@ test/minigzip.c
+	$(CC) $(CFLAGS) $(ZINCOUT) -c -o $@ $(SRCDIR)test/minigzip.c
-example64.o: test/example.c zlib.h zconf.h
+example64.o: $(SRCDIR)test/example.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -D_FILE_OFFSET_BITS=64 -c -o $@ test/example.c
+	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/example.c
-minigzip64.o: test/minigzip.c zlib.h zconf.h
+minigzip64.o: $(SRCDIR)test/minigzip.c $(SRCDIR)zlib.h zconf.h
-	$(CC) $(CFLAGS) -I. -D_FILE_OFFSET_BITS=64 -c -o $@ test/minigzip.c
+	$(CC) $(CFLAGS) $(ZINCOUT) -D_FILE_OFFSET_BITS=64 -c -o $@ $(SRCDIR)test/minigzip.c
 .SUFFIXES: .lo
-.c.lo:
+adler32.o: $(SRCDIR)adler32.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)adler32.c
 crc32.o: $(SRCDIR)crc32.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)crc32.c
 deflate.o: $(SRCDIR)deflate.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)deflate.c
 infback.o: $(SRCDIR)infback.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)infback.c
 inffast.o: $(SRCDIR)inffast.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inffast.c
 inflate.o: $(SRCDIR)inflate.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inflate.c
 inftrees.o: $(SRCDIR)inftrees.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)inftrees.c
 trees.o: $(SRCDIR)trees.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)trees.c
 zutil.o: $(SRCDIR)zutil.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)zutil.c
 compress.o: $(SRCDIR)compress.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)compress.c
 uncompr.o: $(SRCDIR)uncompr.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)uncompr.c
 gzclose.o: $(SRCDIR)gzclose.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzclose.c
 gzlib.o: $(SRCDIR)gzlib.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzlib.c
 gzread.o: $(SRCDIR)gzread.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzread.c
 gzwrite.o: $(SRCDIR)gzwrite.c
 	$(CC) $(CFLAGS) $(ZINC) -c -o $@ $(SRCDIR)gzwrite.c
 adler32.lo: $(SRCDIR)adler32.c
 	-@mkdir objs 2>/dev/null || test -d objs
-	$(CC) $(SFLAGS) -DPIC -c -o objs/$*.o $<
+	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/adler32.o $(SRCDIR)adler32.c
-	-@mv objs/$*.o $@
+	-@mv objs/adler32.o $@
 crc32.lo: $(SRCDIR)crc32.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/crc32.o $(SRCDIR)crc32.c
 	-@mv objs/crc32.o $@
 deflate.lo: $(SRCDIR)deflate.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/deflate.o $(SRCDIR)deflate.c
 	-@mv objs/deflate.o $@
 infback.lo: $(SRCDIR)infback.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/infback.o $(SRCDIR)infback.c
 	-@mv objs/infback.o $@
 inffast.lo: $(SRCDIR)inffast.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inffast.o $(SRCDIR)inffast.c
 	-@mv objs/inffast.o $@
 inflate.lo: $(SRCDIR)inflate.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inflate.o $(SRCDIR)inflate.c
 	-@mv objs/inflate.o $@
 inftrees.lo: $(SRCDIR)inftrees.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/inftrees.o $(SRCDIR)inftrees.c
 	-@mv objs/inftrees.o $@
 trees.lo: $(SRCDIR)trees.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/trees.o $(SRCDIR)trees.c
 	-@mv objs/trees.o $@
 zutil.lo: $(SRCDIR)zutil.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/zutil.o $(SRCDIR)zutil.c
 	-@mv objs/zutil.o $@
 compress.lo: $(SRCDIR)compress.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/compress.o $(SRCDIR)compress.c
 	-@mv objs/compress.o $@
 uncompr.lo: $(SRCDIR)uncompr.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/uncompr.o $(SRCDIR)uncompr.c
 	-@mv objs/uncompr.o $@
 gzclose.lo: $(SRCDIR)gzclose.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzclose.o $(SRCDIR)gzclose.c
 	-@mv objs/gzclose.o $@
 gzlib.lo: $(SRCDIR)gzlib.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzlib.o $(SRCDIR)gzlib.c
 	-@mv objs/gzlib.o $@
 gzread.lo: $(SRCDIR)gzread.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzread.o $(SRCDIR)gzread.c
 	-@mv objs/gzread.o $@
 gzwrite.lo: $(SRCDIR)gzwrite.c
 	-@mkdir objs 2>/dev/null || test -d objs
 	$(CC) $(SFLAGS) $(ZINC) -DPIC -c -o objs/gzwrite.o $(SRCDIR)gzwrite.c
 	-@mv objs/gzwrite.o $@
 placebo $(SHAREDLIBV): $(PIC_OBJS) libz.a
 	$(LDSHARED) $(SFLAGS) -o $@ $(PIC_OBJS) $(LDSHAREDLIBC) $(LDFLAGS)
@@ -190,10 +309,12 @@ install-libs: $(LIBS)
 	-@if [ ! -d $(DESTDIR)$(sharedlibdir) ]; then mkdir -p $(DESTDIR)$(sharedlibdir); fi
 	-@if [ ! -d $(DESTDIR)$(man3dir)      ]; then mkdir -p $(DESTDIR)$(man3dir); fi
 	-@if [ ! -d $(DESTDIR)$(pkgconfigdir) ]; then mkdir -p $(DESTDIR)$(pkgconfigdir); fi
 	rm -f $(DESTDIR)$(libdir)/$(STATICLIB)
 	cp $(STATICLIB) $(DESTDIR)$(libdir)
 	chmod 644 $(DESTDIR)$(libdir)/$(STATICLIB)
 	-@($(RANLIB) $(DESTDIR)$(libdir)/libz.a || true) >/dev/null 2>&1
 	-@if test -n "$(SHAREDLIBV)"; then \
 	  rm -f $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
 	  cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir); \
 	  echo "cp $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)"; \
 	  chmod 755 $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBV); \
@@ -203,8 +324,10 @@ install-libs: $(LIBS)
 	  ln -s $(SHAREDLIBV) $(DESTDIR)$(sharedlibdir)/$(SHAREDLIBM); \
 	  ($(LDCONFIG) || true)  >/dev/null 2>&1; \
 	fi
-	cp zlib.3 $(DESTDIR)$(man3dir)
+	rm -f $(DESTDIR)$(man3dir)/zlib.3
 	cp $(SRCDIR)zlib.3 $(DESTDIR)$(man3dir)
 	chmod 644 $(DESTDIR)$(man3dir)/zlib.3
 	rm -f $(DESTDIR)$(pkgconfigdir)/zlib.pc
 	cp zlib.pc $(DESTDIR)$(pkgconfigdir)
 	chmod 644 $(DESTDIR)$(pkgconfigdir)/zlib.pc
 # The ranlib in install is needed on NeXTSTEP which checks file times
@@ -212,7 +335,8 @@ install-libs: $(LIBS)
 install: install-libs
 	-@if [ ! -d $(DESTDIR)$(includedir)   ]; then mkdir -p $(DESTDIR)$(includedir); fi
-	cp zlib.h zconf.h $(DESTDIR)$(includedir)
+	rm -f $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
 	cp $(SRCDIR)zlib.h zconf.h $(DESTDIR)$(includedir)
 	chmod 644 $(DESTDIR)$(includedir)/zlib.h $(DESTDIR)$(includedir)/zconf.h
 uninstall:
@@ -226,18 +350,18 @@ uninstall:
 docs: zlib.3.pdf
-zlib.3.pdf: zlib.3
+zlib.3.pdf: $(SRCDIR)zlib.3
-	groff -mandoc -f H -T ps zlib.3 | ps2pdf - zlib.3.pdf
+	groff -mandoc -f H -T ps $(SRCDIR)zlib.3 | ps2pdf - $@
-zconf.h.cmakein: zconf.h.in
+zconf.h.cmakein: $(SRCDIR)zconf.h.in
 	-@ TEMPFILE=zconfh_$$; \
 	echo "/#define ZCONF_H/ a\\\\\n#cmakedefine Z_PREFIX\\\\\n#cmakedefine Z_HAVE_UNISTD_H\n" >> $$TEMPFILE &&\
-	sed -f $$TEMPFILE zconf.h.in > zconf.h.cmakein &&\
+	sed -f $$TEMPFILE $(SRCDIR)zconf.h.in > $@ &&\
-	touch -r zconf.h.in zconf.h.cmakein &&\
+	touch -r $(SRCDIR)zconf.h.in $@ &&\
 	rm $$TEMPFILE
-zconf: zconf.h.in
+zconf: $(SRCDIR)zconf.h.in
-	cp -p zconf.h.in zconf.h
+	cp -p $(SRCDIR)zconf.h.in zconf.h
 mostlyclean: clean
 clean:
@@ -255,34 +379,32 @@ maintainer-clean: distclean
 distclean: clean zconf zconf.h.cmakein docs
 	rm -f Makefile zlib.pc configure.log
 	-@rm -f .DS_Store
-	-@printf 'all:\n\t-@echo "Please use ./configure first.  Thank you."\n' > Makefile
+	@if [ -f Makefile.in ]; then \
-	-@printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile
+	printf 'all:\n\t-@echo "Please use ./configure first.  Thank you."\n' > Makefile ; \
-	-@touch -r Makefile.in Makefile
+	printf '\ndistclean:\n\tmake -f Makefile.in distclean\n' >> Makefile ; \
 	touch -r $(SRCDIR)Makefile.in Makefile ; fi
 	@if [ ! -f zconf.h.in ]; then rm -f zconf.h zconf.h.cmakein ; fi
 	@if [ ! -f zlib.3 ]; then rm -f zlib.3.pdf ; fi
 tags:
-	etags *.[ch]
+	etags $(SRCDIR)*.[ch]
-depend:
+adler32.o zutil.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-	makedepend -- $(CFLAGS) -- *.[ch]
+gzclose.o gzlib.o gzread.o gzwrite.o: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
 compress.o example.o minigzip.o uncompr.o: $(SRCDIR)zlib.h zconf.h
 crc32.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
 deflate.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
 infback.o inflate.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
 inffast.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
 inftrees.o: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
 trees.o: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h
-# DO NOT DELETE THIS LINE -- make depend depends on it.
+adler32.lo zutil.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-
+gzclose.lo gzlib.lo gzread.lo gzwrite.lo: $(SRCDIR)zlib.h zconf.h $(SRCDIR)gzguts.h
-adler32.o zutil.o: zutil.h zlib.h zconf.h
+compress.lo example.lo minigzip.lo uncompr.lo: $(SRCDIR)zlib.h zconf.h
-gzclose.o gzlib.o gzread.o gzwrite.o: zlib.h zconf.h gzguts.h
+crc32.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)crc32.h
-compress.o example.o minigzip.o uncompr.o: zlib.h zconf.h
+deflate.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h crc32.h
+infback.lo inflate.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h $(SRCDIR)inffixed.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
+inffast.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h $(SRCDIR)inflate.h $(SRCDIR)inffast.h
-infback.o inflate.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h inffixed.h
+inftrees.lo: $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)inftrees.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
+trees.lo: $(SRCDIR)deflate.h $(SRCDIR)zutil.h $(SRCDIR)zlib.h zconf.h $(SRCDIR)trees.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h
 trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
 adler32.lo zutil.lo: zutil.h zlib.h zconf.h
 gzclose.lo gzlib.lo gzread.lo gzwrite.lo: zlib.h zconf.h gzguts.h
 compress.lo example.lo minigzip.lo uncompr.lo: zlib.h zconf.h
 crc32.lo: zutil.h zlib.h zconf.h crc32.h
 deflate.lo: deflate.h zutil.h zlib.h zconf.h
 infback.lo inflate.lo: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h inffixed.h
 inffast.lo: zutil.h zlib.h zconf.h inftrees.h inflate.h inffast.h
 inftrees.lo: zutil.h zlib.h zconf.h inftrees.h
 trees.lo: deflate.h zutil.h zlib.h zconf.h trees.h
--- a/compat/zlib/README
+++ b/compat/zlib/README
@@ -1,6 +1,6 @@
 ZLIB DATA COMPRESSION LIBRARY
-zlib 1.2.8 is a general purpose data compression library.  All the code is
+zlib 1.2.11 is a general purpose data compression library.  All the code is
 thread safe.  The data format used by the zlib library is described by RFCs
 (Request for Comments) 1950 to 1952 in the files
 http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
@@ -31,7 +31,7 @@ Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan.  1997
 issue of Dr.  Dobb's Journal; a copy of the article is available at
 http://marknelson.us/1997/01/01/zlib-engine/ .
-The changes made in version 1.2.8 are documented in the file ChangeLog.
+The changes made in version 1.2.11 are documented in the file ChangeLog.
 Unsupported third party contributions are provided in directory contrib/ .
@@ -84,7 +84,7 @@ Acknowledgments:
 Copyright notice:
- (C) 1995-2013 Jean-loup Gailly and Mark Adler
+ (C) 1995-2017 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
--- a/compat/zlib/adler32.c
+++ b/compat/zlib/adler32.c
@@ -1,5 +1,5 @@
 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-2011 Mark Adler
+ * Copyright (C) 1995-2011, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -7,11 +7,9 @@
 #include "zutil.h"
 #define local static
 local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
-#define BASE 65521      /* largest prime smaller than 65536 */
+#define BASE 65521U     /* largest prime smaller than 65536 */
 #define NMAX 5552
 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
@@ -62,10 +60,10 @@ local uLong adler32_combine_ OF((uLong adler1, uLong adler2, z_off64_t len2));
 #endif
 /* ========================================================================= */
-uLong ZEXPORT adler32(adler, buf, len)
+uLong ZEXPORT adler32_z(adler, buf, len)
    uLong adler;
    const Bytef *buf;
-    uInt len;
+    z_size_t len;
 {
    unsigned long sum2;
    unsigned n;
@@ -132,6 +130,15 @@ uLong ZEXPORT adler32(adler, buf, len)
    return adler | (sum2 << 16);
 }
 /* ========================================================================= */
 uLong ZEXPORT adler32(adler, buf, len)
    uLong adler;
    const Bytef *buf;
    uInt len;
 {
    return adler32_z(adler, buf, len);
 }
 /* ========================================================================= */
 local uLong adler32_combine_(adler1, adler2, len2)
    uLong adler1;
@@ -156,7 +163,7 @@ local uLong adler32_combine_(adler1, adler2, len2)
    sum2 += ((adler1 >> 16) & 0xffff) + ((adler2 >> 16) & 0xffff) + BASE - rem;
    if (sum1 >= BASE) sum1 -= BASE;
    if (sum1 >= BASE) sum1 -= BASE;
-    if (sum2 >= (BASE << 1)) sum2 -= (BASE << 1);
+    if (sum2 >= ((unsigned long)BASE << 1)) sum2 -= ((unsigned long)BASE << 1);
    if (sum2 >= BASE) sum2 -= BASE;
    return sum1 | (sum2 << 16);
 }
--- a/compat/zlib/as400/bndsrc
+++ b/compat/zlib/as400/bndsrc
@@ -1,215 +0,0 @@
 STRPGMEXP PGMLVL(*CURRENT) SIGNATURE('ZLIB')
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.1.3 entry points.                                    */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /********************************************************************/
 /*   *MODULE      ADLER32      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("adler32")
 /********************************************************************/
 /*   *MODULE      COMPRESS     ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("compress")
  EXPORT SYMBOL("compress2")
 /********************************************************************/
 /*   *MODULE      CRC32        ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("crc32")
  EXPORT SYMBOL("get_crc_table")
 /********************************************************************/
 /*   *MODULE      DEFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("deflate")
  EXPORT SYMBOL("deflateEnd")
  EXPORT SYMBOL("deflateSetDictionary")
  EXPORT SYMBOL("deflateCopy")
  EXPORT SYMBOL("deflateReset")
  EXPORT SYMBOL("deflateParams")
  EXPORT SYMBOL("deflatePrime")
  EXPORT SYMBOL("deflateInit_")
  EXPORT SYMBOL("deflateInit2_")
 /********************************************************************/
 /*   *MODULE      GZIO         ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzopen")
  EXPORT SYMBOL("gzdopen")
  EXPORT SYMBOL("gzsetparams")
  EXPORT SYMBOL("gzread")
  EXPORT SYMBOL("gzwrite")
  EXPORT SYMBOL("gzprintf")
  EXPORT SYMBOL("gzputs")
  EXPORT SYMBOL("gzgets")
  EXPORT SYMBOL("gzputc")
  EXPORT SYMBOL("gzgetc")
  EXPORT SYMBOL("gzflush")
  EXPORT SYMBOL("gzseek")
  EXPORT SYMBOL("gzrewind")
  EXPORT SYMBOL("gztell")
  EXPORT SYMBOL("gzeof")
  EXPORT SYMBOL("gzclose")
  EXPORT SYMBOL("gzerror")
 /********************************************************************/
 /*   *MODULE      INFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflate")
  EXPORT SYMBOL("inflateEnd")
  EXPORT SYMBOL("inflateSetDictionary")
  EXPORT SYMBOL("inflateSync")
  EXPORT SYMBOL("inflateReset")
  EXPORT SYMBOL("inflateInit_")
  EXPORT SYMBOL("inflateInit2_")
  EXPORT SYMBOL("inflateSyncPoint")
 /********************************************************************/
 /*   *MODULE      UNCOMPR      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("uncompress")
 /********************************************************************/
 /*   *MODULE      ZUTIL        ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("zlibVersion")
  EXPORT SYMBOL("zError")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.1 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /********************************************************************/
 /*   *MODULE      COMPRESS     ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("compressBound")
 /********************************************************************/
 /*   *MODULE      DEFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("deflateBound")
 /********************************************************************/
 /*   *MODULE      GZIO         ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzungetc")
  EXPORT SYMBOL("gzclearerr")
 /********************************************************************/
 /*   *MODULE      INFBACK      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflateBack")
  EXPORT SYMBOL("inflateBackEnd")
  EXPORT SYMBOL("inflateBackInit_")
 /********************************************************************/
 /*   *MODULE      INFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflateCopy")
 /********************************************************************/
 /*   *MODULE      ZUTIL        ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("zlibCompileFlags")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.5 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /********************************************************************/
 /*   *MODULE      ADLER32      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("adler32_combine")
  EXPORT SYMBOL("adler32_combine64")
 /********************************************************************/
 /*   *MODULE      CRC32        ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("crc32_combine")
  EXPORT SYMBOL("crc32_combine64")
 /********************************************************************/
 /*   *MODULE      GZLIB        ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzbuffer")
  EXPORT SYMBOL("gzoffset")
  EXPORT SYMBOL("gzoffset64")
  EXPORT SYMBOL("gzopen64")
  EXPORT SYMBOL("gzseek64")
  EXPORT SYMBOL("gztell64")
 /********************************************************************/
 /*   *MODULE      GZREAD       ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzclose_r")
 /********************************************************************/
 /*   *MODULE      GZWRITE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzclose_w")
 /********************************************************************/
 /*   *MODULE      INFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflateMark")
  EXPORT SYMBOL("inflatePrime")
  EXPORT SYMBOL("inflateReset2")
  EXPORT SYMBOL("inflateUndermine")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.6 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /********************************************************************/
 /*   *MODULE      DEFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("deflateResetKeep")
  EXPORT SYMBOL("deflatePending")
 /********************************************************************/
 /*   *MODULE      GZWRITE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("gzgetc_")
 /********************************************************************/
 /*   *MODULE      INFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflateResetKeep")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.8 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /********************************************************************/
 /*   *MODULE      INFLATE      ZLIB         01/02/01  00:15:09      */
 /********************************************************************/
  EXPORT SYMBOL("inflateGetDictionary")
 ENDPGMEXP
--- a/compat/zlib/as400/compile.clp
+++ b/compat/zlib/as400/compile.clp
@@ -1,110 +0,0 @@
 /******************************************************************************/
 /*                                                                            */
 /*  ZLIB                                                                      */
 /*                                                                            */
 /*    Compile sources into modules and link them into a service program.      */
 /*                                                                            */
 /******************************************************************************/
             PGM
 /*      Configuration adjustable parameters.                                  */
             DCL        VAR(&SRCLIB) TYPE(*CHAR) LEN(10) +
                          VALUE('ZLIB')                         /* Source library. */
             DCL        VAR(&SRCFILE) TYPE(*CHAR) LEN(10) +
                          VALUE('SOURCES')                      /* Source member file. */
             DCL        VAR(&CTLFILE) TYPE(*CHAR) LEN(10) +
                          VALUE('TOOLS')                        /* Control member file. */
             DCL        VAR(&MODLIB) TYPE(*CHAR) LEN(10) +
                          VALUE('ZLIB')                         /* Module library. */
             DCL        VAR(&SRVLIB) TYPE(*CHAR) LEN(10) +
                          VALUE('LGPL')                         /* Service program library. */
             DCL        VAR(&CFLAGS) TYPE(*CHAR) +
                          VALUE('OPTIMIZE(40)')                 /* Compile options. */
             DCL        VAR(&TGTRLS) TYPE(*CHAR) +
                          VALUE('V5R3M0')                       /* Target release. */
 /*      Working storage.                                                      */
             DCL        VAR(&CMDLEN) TYPE(*DEC) LEN(15 5) VALUE(300)    /* Command length. */
             DCL        VAR(&CMD) TYPE(*CHAR) LEN(512)
             DCL        VAR(&FIXDCMD) TYPE(*CHAR) LEN(512)
 /*      Compile sources into modules.                                         */
             CHGVAR     VAR(&FIXDCMD) VALUE('CRTCMOD' *BCAT &CFLAGS *BCAT      +
                        'SYSIFCOPT(*IFS64IO)' *BCAT                            +
                        'DEFINE(''_LARGEFILE64_SOURCE''' *BCAT                 +
                        '''_LFS64_LARGEFILE=1'') TGTRLS(' *TCAT &TGTRLS *TCAT  +
                        ') SRCFILE(' *TCAT &SRCLIB *TCAT '/' *TCAT             +
                        &SRCFILE *TCAT ') MODULE(' *TCAT &MODLIB *TCAT '/')
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'ADLER32)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'COMPRESS)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'CRC32)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'DEFLATE)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'GZCLOSE)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'GZLIB)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'GZREAD)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'GZWRITE)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'INFBACK)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'INFFAST)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'INFLATE)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'INFTREES)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'TREES)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'UNCOMPR)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
             CHGVAR     VAR(&CMD) VALUE(&FIXDCMD *TCAT 'ZUTIL)')
             CALL       PGM(QCMDEXC) PARM(&CMD &CMDLEN)
 /*      Link modules into a service program.                                  */
             CRTSRVPGM  SRVPGM(&SRVLIB/ZLIB) +
                          MODULE(&MODLIB/ADLER32     &MODLIB/COMPRESS    +
                                 &MODLIB/CRC32       &MODLIB/DEFLATE     +
                                 &MODLIB/GZCLOSE     &MODLIB/GZLIB       +
                                 &MODLIB/GZREAD      &MODLIB/GZWRITE     +
                                 &MODLIB/INFBACK     &MODLIB/INFFAST     +
                                 &MODLIB/INFLATE     &MODLIB/INFTREES    +
                                 &MODLIB/TREES       &MODLIB/UNCOMPR     +
                                 &MODLIB/ZUTIL)                          +
                          SRCFILE(&SRCLIB/&CTLFILE) SRCMBR(BNDSRC)       +
                          TEXT('ZLIB 1.2.8') TGTRLS(&TGTRLS)
             ENDPGM
--- a/compat/zlib/as400/readme.txt
+++ b/compat/zlib/as400/readme.txt
@@ -1,115 +0,0 @@
        ZLIB version 1.2.8 for AS400 installation instructions
 I) From an AS400 *SAVF file:
 1)      Unpacking archive to an AS400 save file
 On the AS400:
 _       Create the ZLIB AS400 library:
        CRTLIB LIB(ZLIB) TYPE(*PROD) TEXT('ZLIB compression API library')
 _       Create a work save file, for example:
                CRTSAVF FILE(ZLIB/ZLIBSAVF)
 On a PC connected to the target AS400:
 _       Unpack the save file image to a PC file "ZLIBSAVF"
 _       Upload this file into the save file on the AS400, for example
                using ftp in BINARY mode.
 2)      Populating the ZLIB AS400 source library
 On the AS400:
 _       Extract the saved objects into the ZLIB AS400 library using:
 RSTOBJ OBJ(*ALL) SAVLIB(ZLIB) DEV(*SAVF) SAVF(ZLIB/ZLIBSAVF) RSTLIB(ZLIB)
 3)      Customize installation:
 _       Edit CL member ZLIB/TOOLS(COMPILE) and change parameters if needed,
                according to the comments.
 _       Compile this member with:
        CRTCLPGM PGM(ZLIB/COMPILE) SRCFILE(ZLIB/TOOLS) SRCMBR(COMPILE)
 4)      Compile and generate the service program:
 _       This can now be done by executing:
        CALL PGM(ZLIB/COMPILE)
 II) From the original source distribution:
 1)      On the AS400, create the source library:
        CRTLIB LIB(ZLIB) TYPE(*PROD) TEXT('ZLIB compression API library')
 2)      Create the source files:
        CRTSRCPF FILE(ZLIB/SOURCES) RCDLEN(112) TEXT('ZLIB library modules')
        CRTSRCPF FILE(ZLIB/H)       RCDLEN(112) TEXT('ZLIB library includes')
        CRTSRCPF FILE(ZLIB/TOOLS)   RCDLEN(112) TEXT('ZLIB library control utilities')
 3)      From the machine hosting the distribution files, upload them (with
                FTP in text mode, for example) according to the following table:
    Original    AS400   AS400    AS400 AS400
    file        file    member   type  description
                SOURCES                Original ZLIB C subprogram sources
    adler32.c           ADLER32  C     ZLIB - Compute the Adler-32 checksum of a dta strm
    compress.c          COMPRESS C     ZLIB - Compress a memory buffer
    crc32.c             CRC32    C     ZLIB - Compute the CRC-32 of a data stream
    deflate.c           DEFLATE  C     ZLIB - Compress data using the deflation algorithm
    gzclose.c           GZCLOSE  C     ZLIB - Close .gz files
    gzlib.c             GZLIB    C     ZLIB - Miscellaneous .gz files IO support
    gzread.c            GZREAD   C     ZLIB - Read .gz files
    gzwrite.c           GZWRITE  C     ZLIB - Write .gz files
    infback.c           INFBACK  C     ZLIB - Inflate using a callback interface
    inffast.c           INFFAST  C     ZLIB - Fast proc. literals & length/distance pairs
    inflate.c           INFLATE  C     ZLIB - Interface to inflate modules
    inftrees.c          INFTREES C     ZLIB - Generate Huffman trees for efficient decode
    trees.c             TREES    C     ZLIB - Output deflated data using Huffman coding
    uncompr.c           UNCOMPR  C     ZLIB - Decompress a memory buffer
    zutil.c             ZUTIL    C     ZLIB - Target dependent utility functions
                H                      Original ZLIB C and ILE/RPG include files
    crc32.h             CRC32    C     ZLIB - CRC32 tables
    deflate.h           DEFLATE  C     ZLIB - Internal compression state
    gzguts.h            GZGUTS   C     ZLIB - Definitions for the gzclose module
    inffast.h           INFFAST  C     ZLIB - Header to use inffast.c
    inffixed.h          INFFIXED C     ZLIB - Table for decoding fixed codes
    inflate.h           INFLATE  C     ZLIB - Internal inflate state definitions
    inftrees.h          INFTREES C     ZLIB - Header to use inftrees.c
    trees.h             TREES    C     ZLIB - Created automatically with -DGEN_TREES_H
    zconf.h             ZCONF    C     ZLIB - Compression library configuration
    zlib.h              ZLIB     C     ZLIB - Compression library C user interface
    as400/zlib.inc      ZLIB.INC RPGLE ZLIB - Compression library ILE RPG user interface
    zutil.h             ZUTIL    C     ZLIB - Internal interface and configuration
                TOOLS                  Building source software & AS/400 README
    as400/bndsrc        BNDSRC         Entry point exportation list
    as400/compile.clp   COMPILE  CLP   Compile sources & generate service program
    as400/readme.txt    README   TXT   Installation instructions
 4)      Continue as in I)3).
 Notes:  For AS400 ILE RPG programmers, a /copy member defining the ZLIB
                API prototypes for ILE RPG can be found in ZLIB/H(ZLIB.INC).
                Please read comments in this member for more information.
        Remember that most foreign textual data are ASCII coded: this
                implementation does not handle conversion from/to ASCII, so
                text data code conversions must be done explicitely.
        Mainly for the reason above, always open zipped files in binary mode.
--- a/compat/zlib/compress.c
+++ b/compat/zlib/compress.c
@@ -1,5 +1,5 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-2005 Jean-loup Gailly.
+ * Copyright (C) 1995-2005, 2014, 2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -28,16 +28,11 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
 {
    z_stream stream;
    int err;
    const uInt max = (uInt)-1;
    uLong left;
-    stream.next_in = (z_const Bytef *)source;
+    left = *destLen;
-    stream.avail_in = (uInt)sourceLen;
+    *destLen = 0;
 #ifdef MAXSEG_64K
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 #endif
    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
@@ -46,15 +41,26 @@ int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
    err = deflateInit(&stream, level);
    if (err != Z_OK) return err;
-    err = deflate(&stream, Z_FINISH);
+    stream.next_out = dest;
-    if (err != Z_STREAM_END) {
+    stream.avail_out = 0;
-        deflateEnd(&stream);
+    stream.next_in = (z_const Bytef *)source;
-        return err == Z_OK ? Z_BUF_ERROR : err;
+    stream.avail_in = 0;
    }
    *destLen = stream.total_out;
-    err = deflateEnd(&stream);
+    do {
-    return err;
+        if (stream.avail_out == 0) {
            stream.avail_out = left > (uLong)max ? max : (uInt)left;
            left -= stream.avail_out;
        }
        if (stream.avail_in == 0) {
            stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
            sourceLen -= stream.avail_in;
        }
        err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
    } while (err == Z_OK);
    *destLen = stream.total_out;
    deflateEnd(&stream);
    return err == Z_STREAM_END ? Z_OK : err;
 }
 /* ===========================================================================
--- a/compat/zlib/configure
+++ b/compat/zlib/configure
@@ -18,6 +18,18 @@ echo -------------------- >> configure.log
 echo $0 $* >> configure.log
 date >> configure.log
 # get source directory
 SRCDIR=`dirname $0`
 if test $SRCDIR = "."; then
    ZINC=""
    ZINCOUT="-I."
    SRCDIR=""
 else
    ZINC='-include zconf.h'
    ZINCOUT='-I. -I$(SRCDIR)'
    SRCDIR="$SRCDIR/"
 fi
 # set command prefix for cross-compilation
 if [ -n "${CHOST}" ]; then
    uname="`echo "${CHOST}" | sed -e 's/^[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)$/\1/' -e 's/^[^-]*-[^-]*-\([^-]*\)-.*$/\1/'`"
@@ -28,10 +40,10 @@ fi
 STATICLIB=libz.a
 # extract zlib version numbers from zlib.h
-VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`
+VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < ${SRCDIR}zlib.h`
-VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < zlib.h`
+VER3=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\\.[0-9]*\).*/\1/p' < ${SRCDIR}zlib.h`
-VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < zlib.h`
+VER2=`sed -n -e '/VERSION "/s/.*"\([0-9]*\\.[0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
-VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < zlib.h`
+VER1=`sed -n -e '/VERSION "/s/.*"\([0-9]*\)\\..*/\1/p' < ${SRCDIR}zlib.h`
 # establish commands for library building
 if "${CROSS_PREFIX}ar" --version >/dev/null 2>/dev/null || test $? -lt 126; then
@@ -73,6 +85,8 @@ zprefix=0
 zconst=0
 build64=0
 gcc=0
 warn=0
 debug=0
 old_cc="$CC"
 old_cflags="$CFLAGS"
 OBJC='$(OBJZ) $(OBJG)'
@@ -121,6 +135,8 @@ case "$1" in
    --sysconfdir=*) echo "ignored option: --sysconfdir" | tee -a configure.log; shift ;;
    --localstatedir=*) echo "ignored option: --localstatedir" | tee -a configure.log; shift ;;
    -c* | --const) zconst=1; shift ;;
    -w* | --warn) warn=1; shift ;;
    -d* | --debug) debug=1; shift ;;
    *)
      echo "unknown option: $1" | tee -a configure.log
      echo "$0 --help for help" | tee -a configure.log
@@ -159,34 +175,42 @@ case "$cc" in
 esac
 case `$cc -v 2>&1` in
  *gcc*) gcc=1 ;;
  *clang*) gcc=1 ;;
 esac
 show $cc -c $test.c
 if test "$gcc" -eq 1 && ($cc -c $test.c) >> configure.log 2>&1; then
  echo ... using gcc >> configure.log
  CC="$cc"
-  CFLAGS="${CFLAGS--O3} ${ARCHS}"
+  CFLAGS="${CFLAGS--O3}"
  SFLAGS="${CFLAGS--O3} -fPIC"
-  LDFLAGS="${LDFLAGS} ${ARCHS}"
+  if test "$ARCHS"; then
    CFLAGS="${CFLAGS} ${ARCHS}"
    LDFLAGS="${LDFLAGS} ${ARCHS}"
  fi
  if test $build64 -eq 1; then
    CFLAGS="${CFLAGS} -m64"
    SFLAGS="${SFLAGS} -m64"
  fi
-  if test "${ZLIBGCCWARN}" = "YES"; then
+  if test "$warn" -eq 1; then
    if test "$zconst" -eq 1; then
      CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -pedantic -DZLIB_CONST"
    else
      CFLAGS="${CFLAGS} -Wall -Wextra -pedantic"
    fi
  fi
  if test $debug -eq 1; then
    CFLAGS="${CFLAGS} -DZLIB_DEBUG"
    SFLAGS="${SFLAGS} -DZLIB_DEBUG"
  fi
  if test -z "$uname"; then
    uname=`(uname -s || echo unknown) 2>/dev/null`
  fi
  case "$uname" in
  Linux* | linux* | GNU | GNU/* | solaris*)
-        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"} ;;
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"} ;;
  *BSD | *bsd* | DragonFly)
-        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,zlib.map"}
+        LDSHARED=${LDSHARED-"$cc -shared -Wl,-soname,libz.so.1,--version-script,${SRCDIR}zlib.map"}
        LDCONFIG="ldconfig -m" ;;
  CYGWIN* | Cygwin* | cygwin* | OS/2*)
        EXE='.exe' ;;
@@ -287,6 +311,9 @@ else
                 esac
             fi
         fi
         if test -n "$ZINC"; then
             ZINC='-I- -I. -I$(SRCDIR)'
         fi
         ;;
  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
             CFLAGS=${CFLAGS-"-O2"}
@@ -337,16 +364,16 @@ if ($CC -c $CFLAGS $test.c) 2>/dev/null; then
  }
  echo - using any output from compiler to indicate an error >> configure.log
 else
-try()
+  try()
-{
+  {
-  show $*
+    show $*
-  ( $* ) >> configure.log 2>&1
+    ( $* ) >> configure.log 2>&1
-  ret=$?
+    ret=$?
-  if test $ret -ne 0; then
+    if test $ret -ne 0; then
-    echo "(exit code "$ret")" >> configure.log
+      echo "(exit code "$ret")" >> configure.log
-  fi
+    fi
-  return $ret
+    return $ret
-}
+  }
 fi
 tryboth()
@@ -422,6 +449,65 @@ esac
 echo >> configure.log
 # check for size_t
 cat > $test.c <<EOF
 #include <stdio.h>
 #include <stdlib.h>
 size_t dummy = 0;
 EOF
 if try $CC -c $CFLAGS $test.c; then
  echo "Checking for size_t... Yes." | tee -a configure.log
  need_sizet=0
 else
  echo "Checking for size_t... No." | tee -a configure.log
  need_sizet=1
 fi
 echo >> configure.log
 # find the size_t integer type, if needed
 if test $need_sizet -eq 1; then
  cat > $test.c <<EOF
 long long dummy = 0;
 EOF
  if try $CC -c $CFLAGS $test.c; then
    echo "Checking for long long... Yes." | tee -a configure.log
    cat > $test.c <<EOF
 #include <stdio.h>
 int main(void) {
    if (sizeof(void *) <= sizeof(int)) puts("int");
    else if (sizeof(void *) <= sizeof(long)) puts("long");
    else puts("z_longlong");
    return 0;
 }
 EOF
  else
    echo "Checking for long long... No." | tee -a configure.log
    cat > $test.c <<EOF
 #include <stdio.h>
 int main(void) {
    if (sizeof(void *) <= sizeof(int)) puts("int");
    else puts("long");
    return 0;
 }
 EOF
  fi
  if try $CC $CFLAGS -o $test $test.c; then
    sizet=`./$test`
    echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
  else
    echo "Failed to find a pointer-size integer type." | tee -a configure.log
    leave 1
  fi
 fi
 if test $need_sizet -eq 1; then
  CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
  SFLAGS="${SFLAGS} -DNO_SIZE_T=${sizet}"
 fi
 echo >> configure.log
 # check for large file support, and if none, check for fseeko()
 cat > $test.c <<EOF
 #include <sys/types.h>
@@ -470,7 +556,7 @@ else
 fi
 # copy clean zconf.h for subsequent edits
-cp -p zconf.h.in zconf.h
+cp -p ${SRCDIR}zconf.h.in zconf.h
 echo >> configure.log
@@ -764,6 +850,7 @@ echo STATICLIB = $STATICLIB >> configure.log
 echo TEST = $TEST >> configure.log
 echo VER = $VER >> configure.log
 echo Z_U4 = $Z_U4 >> configure.log
 echo SRCDIR = $SRCDIR >> configure.log
 echo exec_prefix = $exec_prefix >> configure.log
 echo includedir = $includedir >> configure.log
 echo libdir = $libdir >> configure.log
@@ -773,7 +860,7 @@ echo sharedlibdir = $sharedlibdir >> configure.log
 echo uname = $uname >> configure.log
 # udpate Makefile with the configure results
-sed < Makefile.in "
+sed < ${SRCDIR}Makefile.in "
 /^CC *=/s#=.*#=$CC#
 /^CFLAGS *=/s#=.*#=$CFLAGS#
 /^SFLAGS *=/s#=.*#=$SFLAGS#
@@ -790,6 +877,9 @@ sed < Makefile.in "
 /^LDCONFIG *=/s#=.*#=$LDCONFIG#
 /^LDSHAREDLIBC *=/s#=.*#=$LDSHAREDLIBC#
 /^EXE *=/s#=.*#=$EXE#
 /^SRCDIR *=/s#=.*#=$SRCDIR#
 /^ZINC *=/s#=.*#=$ZINC#
 /^ZINCOUT *=/s#=.*#=$ZINCOUT#
 /^prefix *=/s#=.*#=$prefix#
 /^exec_prefix *=/s#=.*#=$exec_prefix#
 /^libdir *=/s#=.*#=$libdir#
@@ -803,7 +893,7 @@ sed < Makefile.in "
 " > Makefile
 # create zlib.pc with the configure results
-sed < zlib.pc.in "
+sed < ${SRCDIR}zlib.pc.in "
 /^CC *=/s#=.*#=$CC#
 /^CFLAGS *=/s#=.*#=$CFLAGS#
 /^CPP *=/s#=.*#=$CPP#
--- a/compat/zlib/contrib/README.contrib
+++ b/compat/zlib/contrib/README.contrib
@@ -38,7 +38,7 @@ inflate86/  by Chris Anderson <christop@charm.net>
 iostream/   by Kevin Ruland <kevin@rodin.wustl.edu>
        A C++ I/O streams interface to the zlib gz* functions
-iostream2/  by Tyge L<EFBFBD>vset <Tyge.Lovset@cmr.no>
+iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
        Another C++ I/O streams interface
 iostream3/  by Ludwig Schwardt <schwardt@sun.ac.za>
@@ -58,7 +58,7 @@ masmx86/    by Gilles Vollant <info@winimage.com>
 minizip/    by Gilles Vollant <info@winimage.com>
        Mini zip and unzip based on zlib
        Includes Zip64 support by Mathias Svensson <mathias@result42.com>
-        See http://www.winimage.com/zLibDll/unzip.html
+        See http://www.winimage.com/zLibDll/minizip.html
 pascal/     by Bob Dellaca <bobdl@xtra.co.nz> et al.
        Support for Pascal
--- a/compat/zlib/contrib/ada/zlib-streams.ads
+++ b/compat/zlib/contrib/ada/zlib-streams.ads
@@ -31,7 +31,7 @@ package ZLib.Streams is
      Mode   : in     Flush_Mode := Sync_Flush);
   --  Flush the written data to the back stream,
   --  all data placed to the compressor is flushing to the Back stream.
-   --  Should not be used untill necessary, becouse it is decreasing
+   --  Should not be used until necessary, because it is decreasing
   --  compression.
   function Read_Total_In (Stream : in Stream_Type) return Count;
@@ -97,13 +97,13 @@ private
      Rest_Last  : Stream_Element_Offset;
      --  Buffer for Read operation.
      --  We need to have this buffer in the record
-      --  becouse not all read data from back stream
+      --  because not all read data from back stream
      --  could be processed during the read operation.
      Buffer_Size : Stream_Element_Offset;
      --  Buffer size for write operation.
      --  We do not need to have this buffer
-      --  in the record becouse all data could be
+      --  in the record because all data could be
      --  processed in the write operation.
      Back       : Stream_Access;
--- a/compat/zlib/contrib/ada/zlib-thin.ads
+++ b/compat/zlib/contrib/ada/zlib-thin.ads
@@ -436,7 +436,7 @@ private
   pragma Import (C, inflateBackInit, "inflateBackInit_");
-   --  I stopped binding the inflateBack routines, becouse realize that
+   --  I stopped binding the inflateBack routines, because realize that
   --  it does not support zlib and gzip headers for now, and have no
   --  symmetric deflateBack routines.
   --  ZLib-Ada is symmetric regarding deflate/inflate data transformation
--- a/compat/zlib/contrib/blast/blast.c
+++ b/compat/zlib/contrib/blast/blast.c
@@ -1,7 +1,7 @@
 /* blast.c
- * Copyright (C) 2003, 2012 Mark Adler
+ * Copyright (C) 2003, 2012, 2013 Mark Adler
 * For conditions of distribution and use, see copyright notice in blast.h
- * version 1.2, 24 Oct 2012
+ * version 1.3, 24 Aug 2013
 *
 * blast.c decompresses data compressed by the PKWare Compression Library.
 * This function provides functionality similar to the explode() function of
@@ -24,8 +24,12 @@
 * 1.1  16 Feb 2003     - Fixed distance check for > 4 GB uncompressed data
 * 1.2  24 Oct 2012     - Add note about using binary mode in stdio
 *                      - Fix comparisons of differently signed integers
 * 1.3  24 Aug 2013     - Return unused input from blast()
 *                      - Fix test code to correctly report unused input
 *                      - Enable the provision of initial input to blast()
 */
 #include <stddef.h>             /* for NULL */
 #include <setjmp.h>             /* for setjmp(), longjmp(), and jmp_buf */
 #include "blast.h"              /* prototype for blast() */
@@ -256,7 +260,7 @@ local int construct(struct huffman *h, const unsigned char *rep, int n)
 *   next, 0 for literals, 1 for length/distance.
 *
 * - If literals are uncoded, then the next eight bits are the literal, in the
- *   normal bit order in th stream, i.e. no bit-reversal is needed. Similarly,
+ *   normal bit order in the stream, i.e. no bit-reversal is needed. Similarly,
 *   no bit reversal is needed for either the length extra bits or the distance
 *   extra bits.
 *
@@ -376,7 +380,8 @@ local int decomp(struct state *s)
 }
 /* See comments in blast.h */
-int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow)
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
          unsigned *left, unsigned char **in)
 {
    struct state s;             /* input/output state */
    int err;                    /* return value */
@@ -384,7 +389,12 @@ int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow)
    /* initialize input state */
    s.infun = infun;
    s.inhow = inhow;
-    s.left = 0;
+    if (left != NULL && *left) {
        s.left = *left;
        s.in = *in;
    }
    else
        s.left = 0;
    s.bitbuf = 0;
    s.bitcnt = 0;
@@ -400,6 +410,12 @@ int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow)
    else
        err = decomp(&s);               /* decompress */
    /* return unused input */
    if (left != NULL)
        *left = s.left;
    if (in != NULL)
        *in = s.left ? s.in : NULL;
    /* write any leftover output and update the error code if needed */
    if (err != 1 && s.next && s.outfun(s.outhow, s.out, s.next) && err == 0)
        err = 1;
@@ -429,16 +445,20 @@ local int outf(void *how, unsigned char *buf, unsigned len)
 /* Decompress a PKWare Compression Library stream from stdin to stdout */
 int main(void)
 {
-    int ret, n;
+    int ret;
    unsigned left;
    /* decompress to stdout */
-    ret = blast(inf, stdin, outf, stdout);
+    left = 0;
-    if (ret != 0) fprintf(stderr, "blast error: %d\n", ret);
+    ret = blast(inf, stdin, outf, stdout, &left, NULL);
    if (ret != 0)
        fprintf(stderr, "blast error: %d\n", ret);
-    /* see if there are any leftover bytes */
+    /* count any leftover bytes */
-    n = 0;
+    while (getchar() != EOF)
-    while (getchar() != EOF) n++;
+        left++;
-    if (n) fprintf(stderr, "blast warning: %d unused bytes of input\n", n);
+    if (left)
        fprintf(stderr, "blast warning: %u unused bytes of input\n", left);
    /* return blast() error code */
    return ret;
--- a/compat/zlib/contrib/blast/blast.h
+++ b/compat/zlib/contrib/blast/blast.h
@@ -1,6 +1,6 @@
 /* blast.h -- interface for blast.c
-  Copyright (C) 2003, 2012 Mark Adler
+  Copyright (C) 2003, 2012, 2013 Mark Adler
-  version 1.2, 24 Oct 2012
+  version 1.3, 24 Aug 2013
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the author be held liable for any damages
@@ -42,7 +42,8 @@ typedef int (*blast_out)(void *how, unsigned char *buf, unsigned len);
 */
-int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
+int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow,
          unsigned *left, unsigned char **in);
 /* Decompress input to output using the provided infun() and outfun() calls.
 * On success, the return value of blast() is zero.  If there is an error in
 * the source data, i.e. it is not in the proper format, then a negative value
@@ -55,12 +56,19 @@ int blast(blast_in infun, void *inhow, blast_out outfun, void *outhow);
 * an input error.  (blast() only asks for input if it needs it.)  inhow is for
 * use by the application to pass an input descriptor to infun(), if desired.
 *
 * If left and in are not NULL and *left is not zero when blast() is called,
 * then the *left bytes are *in are consumed for input before infun() is used.
 *
 * The output function is invoked: err = outfun(how, buf, len), where the bytes
 * to be written are buf[0..len-1].  If err is not zero, then blast() returns
 * with an output error.  outfun() is always called with len <= 4096.  outhow
 * is for use by the application to pass an output descriptor to outfun(), if
 * desired.
 *
 * If there is any unused input, *left is set to the number of bytes that were
 * read and *in points to them.  Otherwise *left is set to zero and *in is set
 * to NULL.  If left or in are NULL, then they are not set.
 *
 * The return codes are:
 *
 *   2:  ran out of input before completing decompression
--- a/compat/zlib/contrib/delphi/ZLib.pas
+++ b/compat/zlib/contrib/delphi/ZLib.pas
@@ -152,7 +152,7 @@ procedure DecompressToUserBuf(const InBuf: Pointer; InBytes: Integer;
  const OutBuf: Pointer; BufSize: Integer);
 const
-  zlib_version = '1.2.8';
+  zlib_version = '1.2.11';
 type
  EZlibError = class(Exception);
--- a/compat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
+++ b/compat/zlib/contrib/dotzlib/DotZLib/UnitTests.cs
@@ -156,7 +156,7 @@ namespace DotZLibTests
        public void Info_Version()
        {
            Info info = new Info();
-            Assert.AreEqual("1.2.8", Info.Version);
+            Assert.AreEqual("1.2.11", Info.Version);
            Assert.AreEqual(32, info.SizeOfUInt);
            Assert.AreEqual(32, info.SizeOfULong);
            Assert.AreEqual(32, info.SizeOfPointer);
--- a/compat/zlib/contrib/infback9/inftree9.c
+++ b/compat/zlib/contrib/infback9/inftree9.c
@@ -1,5 +1,5 @@
 /* inftree9.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 const char inflate9_copyright[] =
-   " inflate9 1.2.8 Copyright 1995-2013 Mark Adler ";
+   " inflate9 1.2.11 Copyright 1995-2017 Mark Adler ";
 /*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
@@ -64,7 +64,7 @@ unsigned short FAR *work;
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        128, 128, 128, 128, 128, 128, 128, 128, 129, 129, 129, 129,
        130, 130, 130, 130, 131, 131, 131, 131, 132, 132, 132, 132,
-        133, 133, 133, 133, 144, 72, 78};
+        133, 133, 133, 133, 144, 77, 202};
    static const unsigned short dbase[32] = { /* Distance codes 0..31 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49,
        65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073,
--- a/compat/zlib/contrib/minizip/configure.ac
+++ b/compat/zlib/contrib/minizip/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
-AC_INIT([minizip], [1.2.8], [bugzilla.redhat.com])
+AC_INIT([minizip], [1.2.11], [bugzilla.redhat.com])
 AC_CONFIG_SRCDIR([minizip.c])
 AM_INIT_AUTOMAKE([foreign])
 LT_INIT
--- a/compat/zlib/contrib/minizip/iowin32.c
+++ b/compat/zlib/contrib/minizip/iowin32.c
@@ -26,8 +26,9 @@
 #endif
 // see Include/shared/winapifamily.h in the Windows Kit
 #if defined(WINAPI_FAMILY_PARTITION) && (!(defined(IOWIN32_USING_WINRT_API)))
-#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP)
+#if WINAPI_FAMILY_ONE_PARTITION(WINAPI_FAMILY, WINAPI_PARTITION_APP)
 #define IOWIN32_USING_WINRT_API 1
 #endif
 #endif
@@ -243,7 +244,7 @@ static BOOL MySetFilePointerEx(HANDLE hFile, LARGE_INTEGER pos, LARGE_INTEGER *n
    return SetFilePointerEx(hFile, pos, newPos, dwMoveMethod);
 #else
    LONG lHigh = pos.HighPart;
-    DWORD dwNewPos = SetFilePointer(hFile, pos.LowPart, &lHigh, FILE_CURRENT);
+    DWORD dwNewPos = SetFilePointer(hFile, pos.LowPart, &lHigh, dwMoveMethod);
    BOOL fOk = TRUE;
    if (dwNewPos == 0xFFFFFFFF)
        if (GetLastError() != NO_ERROR)
@@ -370,7 +371,7 @@ long ZCALLBACK win32_seek64_file_func (voidpf opaque, voidpf stream,ZPOS64_T off
    {
        LARGE_INTEGER pos;
        pos.QuadPart = offset;
-        if (!MySetFilePointerEx(hFile, pos, NULL, FILE_CURRENT))
+        if (!MySetFilePointerEx(hFile, pos, NULL, dwMoveMethod))
        {
            DWORD dwErr = GetLastError();
            ((WIN32FILE_IOWIN*)stream) -> error=(int)dwErr;
--- a/compat/zlib/contrib/minizip/unzip.c
+++ b/compat/zlib/contrib/minizip/unzip.c
@@ -200,7 +200,7 @@ typedef struct
 /* ===========================================================================
     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
   for end of file.
-   IN assertion: the stream s has been sucessfully opened for reading.
+   IN assertion: the stream s has been successfully opened for reading.
 */
--- a/compat/zlib/contrib/minizip/zip.c
+++ b/compat/zlib/contrib/minizip/zip.c
@@ -15,7 +15,7 @@
   Oct-2009 - Mathias Svensson - Did some code cleanup and refactoring to get better overview of some functions.
   Oct-2009 - Mathias Svensson - Added zipRemoveExtraInfoBlock to strip extra field data from its ZIP64 data
                                 It is used when recreting zip archive with RAW when deleting items from a zip.
-                                 ZIP64 data is automaticly added to items that needs it, and existing ZIP64 data need to be removed.
+                                 ZIP64 data is automatically added to items that needs it, and existing ZIP64 data need to be removed.
   Oct-2009 - Mathias Svensson - Added support for BZIP2 as compression mode (bzip2 lib is required)
   Jan-2010 - back to unzip and minizip 1.0 name scheme, with compatibility layer
@@ -116,7 +116,7 @@ typedef struct linkedlist_datablock_internal_s
  struct linkedlist_datablock_internal_s* next_datablock;
  uLong  avail_in_this_block;
  uLong  filled_in_this_block;
-  uLong  unused; /* for future use and alignement */
+  uLong  unused; /* for future use and alignment */
  unsigned char data[SIZEDATA_INDATABLOCK];
 } linkedlist_datablock_internal;
@@ -171,7 +171,7 @@ typedef struct
    curfile64_info ci;            /* info on the file curretly writing */
    ZPOS64_T begin_pos;            /* position of the beginning of the zipfile */
-    ZPOS64_T add_position_when_writting_offset;
+    ZPOS64_T add_position_when_writing_offset;
    ZPOS64_T number_entry;
 #ifndef NO_ADDFILEINEXISTINGZIP
@@ -807,7 +807,7 @@ int LoadCentralDirectoryRecord(zip64_internal* pziinit)
  }
  byte_before_the_zipfile = central_pos - (offset_central_dir+size_central_dir);
-  pziinit->add_position_when_writting_offset = byte_before_the_zipfile;
+  pziinit->add_position_when_writing_offset = byte_before_the_zipfile;
  {
    ZPOS64_T size_central_dir_to_read = size_central_dir;
@@ -875,7 +875,7 @@ extern zipFile ZEXPORT zipOpen3 (const void *pathname, int append, zipcharpc* gl
    ziinit.in_opened_file_inzip = 0;
    ziinit.ci.stream_initialised = 0;
    ziinit.number_entry = 0;
-    ziinit.add_position_when_writting_offset = 0;
+    ziinit.add_position_when_writing_offset = 0;
    init_linkedlist(&(ziinit.central_dir));
@@ -1164,7 +1164,7 @@ extern int ZEXPORT zipOpenNewFileInZip4_64 (zipFile file, const char* filename,
    if(zi->ci.pos_local_header >= 0xffffffff)
      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)0xffffffff,4);
    else
-      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header - zi->add_position_when_writting_offset,4);
+      zip64local_putValue_inmemory(zi->ci.central_header+42,(uLong)zi->ci.pos_local_header - zi->add_position_when_writing_offset,4);
    for (i=0;i<size_filename;i++)
        *(zi->ci.central_header+SIZECENTRALHEADER+i) = *(filename+i);
@@ -1755,7 +1755,7 @@ extern int ZEXPORT zipCloseFileInZip (zipFile file)
 int Write_Zip64EndOfCentralDirectoryLocator(zip64_internal* zi, ZPOS64_T zip64eocd_pos_inzip)
 {
  int err = ZIP_OK;
-  ZPOS64_T pos = zip64eocd_pos_inzip - zi->add_position_when_writting_offset;
+  ZPOS64_T pos = zip64eocd_pos_inzip - zi->add_position_when_writing_offset;
  err = zip64local_putValue(&zi->z_filefunc,zi->filestream,(uLong)ZIP64ENDLOCHEADERMAGIC,4);
@@ -1808,7 +1808,7 @@ int Write_Zip64EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centra
  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
  {
-    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writting_offset;
+    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (ZPOS64_T)pos,8);
  }
  return err;
@@ -1849,13 +1849,13 @@ int Write_EndOfCentralDirectoryRecord(zip64_internal* zi, uLong size_centraldir,
  if (err==ZIP_OK) /* offset of start of central directory with respect to the starting disk number */
  {
-    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writting_offset;
+    ZPOS64_T pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    if(pos >= 0xffffffff)
    {
      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)0xffffffff,4);
    }
    else
-      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)(centraldir_pos_inzip - zi->add_position_when_writting_offset),4);
+      err = zip64local_putValue(&zi->z_filefunc,zi->filestream, (uLong)(centraldir_pos_inzip - zi->add_position_when_writing_offset),4);
  }
   return err;
@@ -1921,7 +1921,7 @@ extern int ZEXPORT zipClose (zipFile file, const char* global_comment)
    }
    free_linkedlist(&(zi->central_dir));
-    pos = centraldir_pos_inzip - zi->add_position_when_writting_offset;
+    pos = centraldir_pos_inzip - zi->add_position_when_writing_offset;
    if(pos >= 0xffffffff || zi->number_entry > 0xFFFF)
    {
      ZPOS64_T Zip64EOCDpos = ZTELL64(zi->z_filefunc,zi->filestream);
--- a/compat/zlib/contrib/pascal/zlibpas.pas
+++ b/compat/zlib/contrib/pascal/zlibpas.pas
@@ -10,8 +10,8 @@ unit zlibpas;
 interface
 const
-  ZLIB_VERSION = '1.2.8';
+  ZLIB_VERSION = '1.2.11';
-  ZLIB_VERNUM  = $1280;
+  ZLIB_VERNUM  = $12a0;
 type
  alloc_func = function(opaque: Pointer; items, size: Integer): Pointer;
--- a/compat/zlib/contrib/puff/puff.c
+++ b/compat/zlib/contrib/puff/puff.c
@@ -17,7 +17,7 @@
 * All dynamically allocated memory comes from the stack.  The stack required
 * is less than 2K bytes.  This code is compatible with 16-bit int's and
 * assumes that long's are at least 32 bits.  puff.c uses the short data type,
- * assumed to be 16 bits, for arrays in order to to conserve memory.  The code
+ * assumed to be 16 bits, for arrays in order to conserve memory.  The code
 * works whether integers are stored big endian or little endian.
 *
 * In the comments below are "Format notes" that describe the inflate process
--- a/compat/zlib/contrib/vstudio/readme.txt
+++ b/compat/zlib/contrib/vstudio/readme.txt
@@ -1,4 +1,4 @@
-Building instructions for the DLL versions of Zlib 1.2.8
+Building instructions for the DLL versions of Zlib 1.2.11
 ========================================================
 This directory contains projects that build zlib and minizip using
@@ -16,7 +16,7 @@ More information can be found at this site.
 Build instructions for Visual Studio 2008 (32 bits or 64 bits)
 --------------------------------------------------------------
- Uncompress current zlib, including all contrib/* files
+- Decompress current zlib, including all contrib/* files
 - Compile assembly code (with Visual Studio Command Prompt) by running:
   bld_ml64.bat (in contrib\masmx64)
   bld_ml32.bat (in contrib\masmx86)
@@ -25,14 +25,24 @@ Build instructions for Visual Studio 2008 (32 bits or 64 bits)
 Build instructions for Visual Studio 2010 (32 bits or 64 bits)
 --------------------------------------------------------------
- Uncompress current zlib, including all contrib/* files
+- Decompress current zlib, including all contrib/* files
 - Open contrib\vstudio\vc10\zlibvc.sln with Microsoft Visual C++ 2010
 Build instructions for Visual Studio 2012 (32 bits or 64 bits)
 --------------------------------------------------------------
- Uncompress current zlib, including all contrib/* files
+- Decompress current zlib, including all contrib/* files
 - Open contrib\vstudio\vc11\zlibvc.sln with Microsoft Visual C++ 2012
 Build instructions for Visual Studio 2013 (32 bits or 64 bits)
 --------------------------------------------------------------
 - Decompress current zlib, including all contrib/* files
 - Open contrib\vstudio\vc12\zlibvc.sln with Microsoft Visual C++ 2013
 Build instructions for Visual Studio 2015 (32 bits or 64 bits)
 --------------------------------------------------------------
 - Decompress current zlib, including all contrib/* files
 - Open contrib\vstudio\vc14\zlibvc.sln with Microsoft Visual C++ 2015
 Important
 ---------
@@ -63,3 +73,6 @@ Additional notes
 Gilles Vollant
 info@winimage.com
 Visual Studio 2013 and 2015 Projects from Sean Hunt
 seandhunt_7@yahoo.com
--- a/compat/zlib/contrib/vstudio/vc10/zlib.rc
+++ b/compat/zlib/contrib/vstudio/vc10/zlib.rc
@@ -2,8 +2,8 @@
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1,2,8,0
+  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1,2,8,0
+  PRODUCTVERSION 1, 2, 11, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
@@ -17,12 +17,12 @@ BEGIN
    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.8\0"
+      VALUE "FileVersion",	"1.2.11\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2013 Jean-loup Gailly & Mark Adler\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
--- a/compat/zlib/contrib/vstudio/vc10/zlibvc.def
+++ b/compat/zlib/contrib/vstudio/vc10/zlibvc.def
@@ -1,7 +1,7 @@
 LIBRARY
 ; zlib data compression and ZIP file I/O library
-VERSION		1.2.8
+VERSION		1.2
 EXPORTS
        adler32                                  @1
@@ -141,3 +141,13 @@ EXPORTS
 ; zlib1 v1.2.8 added:
        inflateGetDictionary                    @166
        gzvprintf                               @167
 ; zlib1 v1.2.9 added:
        inflateCodesUsed                        @168
        inflateValidate                         @169
        uncompress2                             @170
        gzfread                                 @171
        gzfwrite                                @172
        deflateGetDictionary                    @173
        adler32_z                               @174
        crc32_z                                 @175
--- a/compat/zlib/contrib/vstudio/vc11/zlib.rc
+++ b/compat/zlib/contrib/vstudio/vc11/zlib.rc
@@ -2,8 +2,8 @@
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1,2,8,0
+  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1,2,8,0
+  PRODUCTVERSION 1, 2, 11, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
@@ -17,12 +17,12 @@ BEGIN
    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.8\0"
+      VALUE "FileVersion",	"1.2.11\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2013 Jean-loup Gailly & Mark Adler\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
--- a/compat/zlib/contrib/vstudio/vc11/zlibvc.def
+++ b/compat/zlib/contrib/vstudio/vc11/zlibvc.def
@@ -1,7 +1,7 @@
 LIBRARY
 ; zlib data compression and ZIP file I/O library
-VERSION		1.2.8
+VERSION		1.2
 EXPORTS
        adler32                                  @1
@@ -141,3 +141,13 @@ EXPORTS
 ; zlib1 v1.2.8 added:
        inflateGetDictionary                    @166
        gzvprintf                               @167
 ; zlib1 v1.2.9 added:
        inflateCodesUsed                        @168
        inflateValidate                         @169
        uncompress2                             @170
        gzfread                                 @171
        gzfwrite                                @172
        deflateGetDictionary                    @173
        adler32_z                               @174
        crc32_z                                 @175
--- a/compat/zlib/contrib/vstudio/vc12/miniunz.vcxproj
+++ b/compat/zlib/contrib/vstudio/vc12/miniunz.vcxproj
@@ -0,0 +1,316 @@
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--- a/compat/zlib/contrib/vstudio/vc12/minizip.vcxproj
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@@ -0,0 +1,313 @@
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--- a/compat/zlib/contrib/vstudio/vc12/zlib.rc
+++ b/compat/zlib/contrib/vstudio/vc12/zlib.rc
@@ -0,0 +1,32 @@
 #include <windows.h>
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 2, 11, 0
  PRODUCTVERSION 1, 2, 11, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
 BEGIN
  BLOCK "StringFileInfo"
  BEGIN
    BLOCK "040904E4"
    //language ID = U.S. English, char set = Windows, Multilingual
    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
      VALUE "FileVersion",	"1.2.11\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
 END
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+++ b/compat/zlib/contrib/vstudio/vc12/zlibstat.vcxproj
@@ -0,0 +1,467 @@
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    <Lib>
      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </Lib>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
    <Midl>
      <TargetEnvironment>X64</TargetEnvironment>
    </Midl>
    <ClCompile>
      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;ASMV;ASMINF;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <StringPooling>true</StringPooling>
      <ExceptionHandling>
      </ExceptionHandling>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <BufferSecurityCheck>false</BufferSecurityCheck>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
      <ObjectFileName>$(IntDir)</ObjectFileName>
      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
      <WarningLevel>Level3</WarningLevel>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </ClCompile>
    <ResourceCompile>
      <Culture>0x040c</Culture>
    </ResourceCompile>
    <Lib>
      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
      <AdditionalDependencies>..\..\masmx64\gvmat64.obj;..\..\masmx64\inffasx64.obj;%(AdditionalDependencies)</AdditionalDependencies>
      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </Lib>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">
    <Midl>
      <TargetEnvironment>Itanium</TargetEnvironment>
    </Midl>
    <ClCompile>
      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <StringPooling>true</StringPooling>
      <ExceptionHandling>
      </ExceptionHandling>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <BufferSecurityCheck>false</BufferSecurityCheck>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
      <ObjectFileName>$(IntDir)</ObjectFileName>
      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
      <WarningLevel>Level3</WarningLevel>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </ClCompile>
    <ResourceCompile>
      <Culture>0x040c</Culture>
    </ResourceCompile>
    <Lib>
      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </Lib>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|x64'">
    <Midl>
      <TargetEnvironment>X64</TargetEnvironment>
    </Midl>
    <ClCompile>
      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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      <StringPooling>true</StringPooling>
      <ExceptionHandling>
      </ExceptionHandling>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <BufferSecurityCheck>false</BufferSecurityCheck>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
      <ObjectFileName>$(IntDir)</ObjectFileName>
      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
      <WarningLevel>Level3</WarningLevel>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </ClCompile>
    <ResourceCompile>
      <Culture>0x040c</Culture>
    </ResourceCompile>
    <Lib>
      <AdditionalOptions>/MACHINE:AMD64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </Lib>
  </ItemDefinitionGroup>
  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">
    <Midl>
      <TargetEnvironment>Itanium</TargetEnvironment>
    </Midl>
    <ClCompile>
      <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
      <AdditionalIncludeDirectories>..\..\..;..\..\masmx86;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>ZLIB_WINAPI;_CRT_NONSTDC_NO_DEPRECATE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_WARNINGS;WIN64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <StringPooling>true</StringPooling>
      <ExceptionHandling>
      </ExceptionHandling>
      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
      <BufferSecurityCheck>false</BufferSecurityCheck>
      <FunctionLevelLinking>true</FunctionLevelLinking>
      <PrecompiledHeaderOutputFile>$(IntDir)zlibstat.pch</PrecompiledHeaderOutputFile>
      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
      <ObjectFileName>$(IntDir)</ObjectFileName>
      <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
      <WarningLevel>Level3</WarningLevel>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </ClCompile>
    <ResourceCompile>
      <Culture>0x040c</Culture>
    </ResourceCompile>
    <Lib>
      <AdditionalOptions>/MACHINE:IA64 /NODEFAULTLIB %(AdditionalOptions)</AdditionalOptions>
      <OutputFile>$(OutDir)zlibstat.lib</OutputFile>
      <SuppressStartupBanner>true</SuppressStartupBanner>
    </Lib>
  </ItemDefinitionGroup>
  <ItemGroup>
    <ClCompile Include="..\..\..\adler32.c" />
    <ClCompile Include="..\..\..\compress.c" />
    <ClCompile Include="..\..\..\crc32.c" />
    <ClCompile Include="..\..\..\deflate.c" />
    <ClCompile Include="..\..\..\gzclose.c" />
    <ClCompile Include="..\..\..\gzlib.c" />
    <ClCompile Include="..\..\..\gzread.c" />
    <ClCompile Include="..\..\..\gzwrite.c" />
    <ClCompile Include="..\..\..\infback.c" />
    <ClCompile Include="..\..\masmx64\inffas8664.c">
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Itanium'">true</ExcludedFromBuild>
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Itanium'">true</ExcludedFromBuild>
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='ReleaseWithoutAsm|Win32'">true</ExcludedFromBuild>
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Itanium'">true</ExcludedFromBuild>
      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
    </ClCompile>
    <ClCompile Include="..\..\..\inffast.c" />
    <ClCompile Include="..\..\..\inflate.c" />
    <ClCompile Include="..\..\..\inftrees.c" />
    <ClCompile Include="..\..\minizip\ioapi.c" />
    <ClCompile Include="..\..\..\trees.c" />
    <ClCompile Include="..\..\..\uncompr.c" />
    <ClCompile Include="..\..\minizip\unzip.c" />
    <ClCompile Include="..\..\minizip\zip.c" />
    <ClCompile Include="..\..\..\zutil.c" />
  </ItemGroup>
  <ItemGroup>
    <ResourceCompile Include="zlib.rc" />
  </ItemGroup>
  <ItemGroup>
    <None Include="zlibvc.def" />
  </ItemGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
 </Project>
--- a/compat/zlib/contrib/vstudio/vc12/zlibvc.def
+++ b/compat/zlib/contrib/vstudio/vc12/zlibvc.def
@@ -0,0 +1,153 @@
 LIBRARY
 ; zlib data compression and ZIP file I/O library
 VERSION		1.2
 EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5
        deflateEnd                               @6
        deflateInit2_                            @7
        deflateInit_                             @8
        deflateParams                            @9
        deflateReset                             @10
        deflateSetDictionary                     @11
        gzclose                                  @12
        gzdopen                                  @13
        gzerror                                  @14
        gzflush                                  @15
        gzopen                                   @16
        gzread                                   @17
        gzwrite                                  @18
        inflate                                  @19
        inflateEnd                               @20
        inflateInit2_                            @21
        inflateInit_                             @22
        inflateReset                             @23
        inflateSetDictionary                     @24
        inflateSync                              @25
        uncompress                               @26
        zlibVersion                              @27
        gzprintf                                 @28
        gzputc                                   @29
        gzgetc                                   @30
        gzseek                                   @31
        gzrewind                                 @32
        gztell                                   @33
        gzeof                                    @34
        gzsetparams                              @35
        zError                                   @36
        inflateSyncPoint                         @37
        get_crc_table                            @38
        compress2                                @39
        gzputs                                   @40
        gzgets                                   @41
        inflateCopy                              @42
        inflateBackInit_                         @43
        inflateBack                              @44
        inflateBackEnd                           @45
        compressBound                            @46
        deflateBound                             @47
        gzclearerr                               @48
        gzungetc                                 @49
        zlibCompileFlags                         @50
        deflatePrime                             @51
        deflatePending                           @52
        unzOpen                                  @61
        unzClose                                 @62
        unzGetGlobalInfo                         @63
        unzGetCurrentFileInfo                    @64
        unzGoToFirstFile                         @65
        unzGoToNextFile                          @66
        unzOpenCurrentFile                       @67
        unzReadCurrentFile                       @68
        unzOpenCurrentFile3                      @69
        unztell                                  @70
        unzeof                                   @71
        unzCloseCurrentFile                      @72
        unzGetGlobalComment                      @73
        unzStringFileNameCompare                 @74
        unzLocateFile                            @75
        unzGetLocalExtrafield                    @76
        unzOpen2                                 @77
        unzOpenCurrentFile2                      @78
        unzOpenCurrentFilePassword               @79
        zipOpen                                  @80
        zipOpenNewFileInZip                      @81
        zipWriteInFileInZip                      @82
        zipCloseFileInZip                        @83
        zipClose                                 @84
        zipOpenNewFileInZip2                     @86
        zipCloseFileInZipRaw                     @87
        zipOpen2                                 @88
        zipOpenNewFileInZip3                     @89
        unzGetFilePos                            @100
        unzGoToFilePos                           @101
        fill_win32_filefunc                      @110
 ; zlibwapi v1.2.4 added:
        fill_win32_filefunc64                   @111
        fill_win32_filefunc64A                  @112
        fill_win32_filefunc64W                  @113
        unzOpen64                               @120
        unzOpen2_64                             @121
        unzGetGlobalInfo64                      @122
        unzGetCurrentFileInfo64                 @124
        unzGetCurrentFileZStreamPos64           @125
        unztell64                               @126
        unzGetFilePos64                         @127
        unzGoToFilePos64                        @128
        zipOpen64                               @130
        zipOpen2_64                             @131
        zipOpenNewFileInZip64                   @132
        zipOpenNewFileInZip2_64                 @133
        zipOpenNewFileInZip3_64                 @134
        zipOpenNewFileInZip4_64                 @135
        zipCloseFileInZipRaw64                  @136
 ; zlib1 v1.2.4 added:
        adler32_combine                         @140
        crc32_combine                           @142
        deflateSetHeader                        @144
        deflateTune                             @145
        gzbuffer                                @146
        gzclose_r                               @147
        gzclose_w                               @148
        gzdirect                                @149
        gzoffset                                @150
        inflateGetHeader                        @156
        inflateMark                             @157
        inflatePrime                            @158
        inflateReset2                           @159
        inflateUndermine                        @160
 ; zlib1 v1.2.6 added:
        gzgetc_                                 @161
        inflateResetKeep                        @163
        deflateResetKeep                        @164
 ; zlib1 v1.2.7 added:
        gzopen_w                                @165
 ; zlib1 v1.2.8 added:
        inflateGetDictionary                    @166
        gzvprintf                               @167
 ; zlib1 v1.2.9 added:
        inflateCodesUsed                        @168
        inflateValidate                         @169
        uncompress2                             @170
        gzfread                                 @171
        gzfwrite                                @172
        deflateGetDictionary                    @173
        adler32_z                               @174
        crc32_z                                 @175
--- a/compat/zlib/contrib/vstudio/vc12/zlibvc.sln
+++ b/compat/zlib/contrib/vstudio/vc12/zlibvc.sln
@@ -0,0 +1,119 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 2013
 VisualStudioVersion = 12.0.40629.0
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcxproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Itanium = Debug|Itanium
 		Debug|Win32 = Debug|Win32
 		Debug|x64 = Debug|x64
 		Release|Itanium = Release|Itanium
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
 		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
 		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
 		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
 	EndGlobalSection
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 		{8FD826F8-3739-44E6-8CC8-997122E53B8D}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
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 		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|Win32.Build.0 = Debug|Win32
 		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.Debug|x64.ActiveCfg = Debug|x64
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 		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
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 		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
 		{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
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 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
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 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = ReleaseWithoutAsm|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.ActiveCfg = ReleaseWithoutAsm|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Win32.Build.0 = ReleaseWithoutAsm|Win32
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.ActiveCfg = ReleaseWithoutAsm|x64
 		{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|x64.Build.0 = ReleaseWithoutAsm|x64
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Itanium.ActiveCfg = Debug|Win32
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 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|Win32.Build.0 = Debug|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.ActiveCfg = Debug|x64
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Debug|x64.Build.0 = Debug|x64
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Itanium.ActiveCfg = Release|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.ActiveCfg = Release|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|Win32.Build.0 = Release|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.ActiveCfg = Release|x64
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.Release|x64.Build.0 = Release|x64
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|Win32.ActiveCfg = Release|Win32
 		{C52F9E7B-498A-42BE-8DB4-85A15694366A}.ReleaseWithoutAsm|x64.ActiveCfg = Release|x64
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Itanium.ActiveCfg = Debug|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.ActiveCfg = Debug|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|Win32.Build.0 = Debug|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.ActiveCfg = Debug|x64
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Debug|x64.Build.0 = Debug|x64
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Itanium.ActiveCfg = Release|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.ActiveCfg = Release|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|Win32.Build.0 = Release|Win32
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.ActiveCfg = Release|x64
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.Release|x64.Build.0 = Release|x64
 		{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}.ReleaseWithoutAsm|Itanium.ActiveCfg = Release|Win32
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@@ -0,0 +1,32 @@
 #include <windows.h>
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
  FILEVERSION	 1, 2, 11, 0
  PRODUCTVERSION 1, 2, 11, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
  FILETYPE	VFT_DLL
  FILESUBTYPE	0	// not used
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  BEGIN
    BLOCK "040904E4"
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    BEGIN
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      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
  BEGIN
    VALUE "Translation", 0x0409, 1252
  END
 END
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 </Project>
--- a/compat/zlib/contrib/vstudio/vc14/zlibvc.def
+++ b/compat/zlib/contrib/vstudio/vc14/zlibvc.def
@@ -0,0 +1,153 @@
 LIBRARY
 ; zlib data compression and ZIP file I/O library
 VERSION		1.2
 EXPORTS
        adler32                                  @1
        compress                                 @2
        crc32                                    @3
        deflate                                  @4
        deflateCopy                              @5
        deflateEnd                               @6
        deflateInit2_                            @7
        deflateInit_                             @8
        deflateParams                            @9
        deflateReset                             @10
        deflateSetDictionary                     @11
        gzclose                                  @12
        gzdopen                                  @13
        gzerror                                  @14
        gzflush                                  @15
        gzopen                                   @16
        gzread                                   @17
        gzwrite                                  @18
        inflate                                  @19
        inflateEnd                               @20
        inflateInit2_                            @21
        inflateInit_                             @22
        inflateReset                             @23
        inflateSetDictionary                     @24
        inflateSync                              @25
        uncompress                               @26
        zlibVersion                              @27
        gzprintf                                 @28
        gzputc                                   @29
        gzgetc                                   @30
        gzseek                                   @31
        gzrewind                                 @32
        gztell                                   @33
        gzeof                                    @34
        gzsetparams                              @35
        zError                                   @36
        inflateSyncPoint                         @37
        get_crc_table                            @38
        compress2                                @39
        gzputs                                   @40
        gzgets                                   @41
        inflateCopy                              @42
        inflateBackInit_                         @43
        inflateBack                              @44
        inflateBackEnd                           @45
        compressBound                            @46
        deflateBound                             @47
        gzclearerr                               @48
        gzungetc                                 @49
        zlibCompileFlags                         @50
        deflatePrime                             @51
        deflatePending                           @52
        unzOpen                                  @61
        unzClose                                 @62
        unzGetGlobalInfo                         @63
        unzGetCurrentFileInfo                    @64
        unzGoToFirstFile                         @65
        unzGoToNextFile                          @66
        unzOpenCurrentFile                       @67
        unzReadCurrentFile                       @68
        unzOpenCurrentFile3                      @69
        unztell                                  @70
        unzeof                                   @71
        unzCloseCurrentFile                      @72
        unzGetGlobalComment                      @73
        unzStringFileNameCompare                 @74
        unzLocateFile                            @75
        unzGetLocalExtrafield                    @76
        unzOpen2                                 @77
        unzOpenCurrentFile2                      @78
        unzOpenCurrentFilePassword               @79
        zipOpen                                  @80
        zipOpenNewFileInZip                      @81
        zipWriteInFileInZip                      @82
        zipCloseFileInZip                        @83
        zipClose                                 @84
        zipOpenNewFileInZip2                     @86
        zipCloseFileInZipRaw                     @87
        zipOpen2                                 @88
        zipOpenNewFileInZip3                     @89
        unzGetFilePos                            @100
        unzGoToFilePos                           @101
        fill_win32_filefunc                      @110
 ; zlibwapi v1.2.4 added:
        fill_win32_filefunc64                   @111
        fill_win32_filefunc64A                  @112
        fill_win32_filefunc64W                  @113
        unzOpen64                               @120
        unzOpen2_64                             @121
        unzGetGlobalInfo64                      @122
        unzGetCurrentFileInfo64                 @124
        unzGetCurrentFileZStreamPos64           @125
        unztell64                               @126
        unzGetFilePos64                         @127
        unzGoToFilePos64                        @128
        zipOpen64                               @130
        zipOpen2_64                             @131
        zipOpenNewFileInZip64                   @132
        zipOpenNewFileInZip2_64                 @133
        zipOpenNewFileInZip3_64                 @134
        zipOpenNewFileInZip4_64                 @135
        zipCloseFileInZipRaw64                  @136
 ; zlib1 v1.2.4 added:
        adler32_combine                         @140
        crc32_combine                           @142
        deflateSetHeader                        @144
        deflateTune                             @145
        gzbuffer                                @146
        gzclose_r                               @147
        gzclose_w                               @148
        gzdirect                                @149
        gzoffset                                @150
        inflateGetHeader                        @156
        inflateMark                             @157
        inflatePrime                            @158
        inflateReset2                           @159
        inflateUndermine                        @160
 ; zlib1 v1.2.6 added:
        gzgetc_                                 @161
        inflateResetKeep                        @163
        deflateResetKeep                        @164
 ; zlib1 v1.2.7 added:
        gzopen_w                                @165
 ; zlib1 v1.2.8 added:
        inflateGetDictionary                    @166
        gzvprintf                               @167
 ; zlib1 v1.2.9 added:
        inflateCodesUsed                        @168
        inflateValidate                         @169
        uncompress2                             @170
        gzfread                                 @171
        gzfwrite                                @172
        deflateGetDictionary                    @173
        adler32_z                               @174
        crc32_z                                 @175
--- a/compat/zlib/contrib/vstudio/vc14/zlibvc.sln
+++ b/compat/zlib/contrib/vstudio/vc14/zlibvc.sln
@@ -0,0 +1,119 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 14
 VisualStudioVersion = 14.0.25420.1
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibvc", "zlibvc.vcxproj", "{8FD826F8-3739-44E6-8CC8-997122E53B8D}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlibstat", "zlibstat.vcxproj", "{745DEC58-EBB3-47A9-A9B8-4C6627C01BF8}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlib", "testzlib.vcxproj", "{AA6666AA-E09F-4135-9C0C-4FE50C3C654B}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "testzlibdll", "testzlibdll.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694366A}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "minizip", "minizip.vcxproj", "{48CDD9DC-E09F-4135-9C0C-4FE50C3C654B}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "miniunz", "miniunz.vcxproj", "{C52F9E7B-498A-42BE-8DB4-85A15694382A}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Itanium = Debug|Itanium
 		Debug|Win32 = Debug|Win32
 		Debug|x64 = Debug|x64
 		Release|Itanium = Release|Itanium
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
 		ReleaseWithoutAsm|Itanium = ReleaseWithoutAsm|Itanium
 		ReleaseWithoutAsm|Win32 = ReleaseWithoutAsm|Win32
 		ReleaseWithoutAsm|x64 = ReleaseWithoutAsm|x64
 	EndGlobalSection
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 </Project>
--- a/compat/zlib/contrib/vstudio/vc9/zlib.rc
+++ b/compat/zlib/contrib/vstudio/vc9/zlib.rc
@@ -2,8 +2,8 @@
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1,2,8,0
+  FILEVERSION	 1, 2, 11, 0
-  PRODUCTVERSION 1,2,8,0
+  PRODUCTVERSION 1, 2, 11, 0
  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
  FILEFLAGS	0
  FILEOS	VOS_DOS_WINDOWS32
@@ -17,12 +17,12 @@ BEGIN
    BEGIN
      VALUE "FileDescription", "zlib data compression and ZIP file I/O library\0"
-      VALUE "FileVersion",	"1.2.8\0"
+      VALUE "FileVersion",	"1.2.11\0"
      VALUE "InternalName",	"zlib\0"
      VALUE "OriginalFilename",	"zlibwapi.dll\0"
      VALUE "ProductName",	"ZLib.DLL\0"
      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
-      VALUE "LegalCopyright", "(C) 1995-2013 Jean-loup Gailly & Mark Adler\0"
+      VALUE "LegalCopyright", "(C) 1995-2017 Jean-loup Gailly & Mark Adler\0"
    END
  END
  BLOCK "VarFileInfo"
--- a/compat/zlib/contrib/vstudio/vc9/zlibvc.def
+++ b/compat/zlib/contrib/vstudio/vc9/zlibvc.def
@@ -1,7 +1,7 @@
 LIBRARY
 ; zlib data compression and ZIP file I/O library
-VERSION		1.2.8
+VERSION		1.2
 EXPORTS
        adler32                                  @1
@@ -141,3 +141,13 @@ EXPORTS
 ; zlib1 v1.2.8 added:
        inflateGetDictionary                    @166
        gzvprintf                               @167
 ; zlib1 v1.2.9 added:
        inflateCodesUsed                        @168
        inflateValidate                         @169
        uncompress2                             @170
        gzfread                                 @171
        gzfwrite                                @172
        deflateGetDictionary                    @173
        adler32_z                               @174
        crc32_z                                 @175
--- a/compat/zlib/crc32.c
+++ b/compat/zlib/crc32.c
@@ -1,5 +1,5 @@
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-2006, 2010, 2011, 2012 Mark Adler
+ * Copyright (C) 1995-2006, 2010, 2011, 2012, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 *
 * Thanks to Rodney Brown <rbrown64@csc.com.au> for his contribution of faster
@@ -30,17 +30,15 @@
 #include "zutil.h"      /* for STDC and FAR definitions */
 #define local static
 /* Definitions for doing the crc four data bytes at a time. */
 #if !defined(NOBYFOUR) && defined(Z_U4)
 #  define BYFOUR
 #endif
 #ifdef BYFOUR
   local unsigned long crc32_little OF((unsigned long,
-                        const unsigned char FAR *, unsigned));
+                        const unsigned char FAR *, z_size_t));
   local unsigned long crc32_big OF((unsigned long,
-                        const unsigned char FAR *, unsigned));
+                        const unsigned char FAR *, z_size_t));
 #  define TBLS 8
 #else
 #  define TBLS 1
@@ -201,10 +199,10 @@ const z_crc_t FAR * ZEXPORT get_crc_table()
 #define DO8 DO1; DO1; DO1; DO1; DO1; DO1; DO1; DO1
 /* ========================================================================= */
-unsigned long ZEXPORT crc32(crc, buf, len)
+unsigned long ZEXPORT crc32_z(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    uInt len;
+    z_size_t len;
 {
    if (buf == Z_NULL) return 0UL;
@@ -235,8 +233,29 @@ unsigned long ZEXPORT crc32(crc, buf, len)
    return crc ^ 0xffffffffUL;
 }
 /* ========================================================================= */
 unsigned long ZEXPORT crc32(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
    uInt len;
 {
    return crc32_z(crc, buf, len);
 }
 #ifdef BYFOUR
 /*
   This BYFOUR code accesses the passed unsigned char * buffer with a 32-bit
   integer pointer type. This violates the strict aliasing rule, where a
   compiler can assume, for optimization purposes, that two pointers to
   fundamentally different types won't ever point to the same memory. This can
   manifest as a problem only if one of the pointers is written to. This code
   only reads from those pointers. So long as this code remains isolated in
   this compilation unit, there won't be a problem. For this reason, this code
   should not be copied and pasted into a compilation unit in which other code
   writes to the buffer that is passed to these routines.
 */
 /* ========================================================================= */
 #define DOLIT4 c ^= *buf4++; \
        c = crc_table[3][c & 0xff] ^ crc_table[2][(c >> 8) & 0xff] ^ \
@@ -247,7 +266,7 @@ unsigned long ZEXPORT crc32(crc, buf, len)
 local unsigned long crc32_little(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    unsigned len;
+    z_size_t len;
 {
    register z_crc_t c;
    register const z_crc_t FAR *buf4;
@@ -278,7 +297,7 @@ local unsigned long crc32_little(crc, buf, len)
 }
 /* ========================================================================= */
-#define DOBIG4 c ^= *++buf4; \
+#define DOBIG4 c ^= *buf4++; \
        c = crc_table[4][c & 0xff] ^ crc_table[5][(c >> 8) & 0xff] ^ \
            crc_table[6][(c >> 16) & 0xff] ^ crc_table[7][c >> 24]
 #define DOBIG32 DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4; DOBIG4
@@ -287,7 +306,7 @@ local unsigned long crc32_little(crc, buf, len)
 local unsigned long crc32_big(crc, buf, len)
    unsigned long crc;
    const unsigned char FAR *buf;
-    unsigned len;
+    z_size_t len;
 {
    register z_crc_t c;
    register const z_crc_t FAR *buf4;
@@ -300,7 +319,6 @@ local unsigned long crc32_big(crc, buf, len)
    }
    buf4 = (const z_crc_t FAR *)(const void FAR *)buf;
    buf4--;
    while (len >= 32) {
        DOBIG32;
        len -= 32;
@@ -309,7 +327,6 @@ local unsigned long crc32_big(crc, buf, len)
        DOBIG4;
        len -= 4;
    }
    buf4++;
    buf = (const unsigned char FAR *)buf4;
    if (len) do {
--- a/compat/zlib/deflate.c
+++ b/compat/zlib/deflate.c
--- a/compat/zlib/deflate.h
+++ b/compat/zlib/deflate.h
@@ -1,5 +1,5 @@
 /* deflate.h -- internal compression state
- * Copyright (C) 1995-2012 Jean-loup Gailly
+ * Copyright (C) 1995-2016 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -51,13 +51,16 @@
 #define Buf_size 16
 /* size of bit buffer in bi_buf */
-#define INIT_STATE    42
+#define INIT_STATE    42    /* zlib header -> BUSY_STATE */
-#define EXTRA_STATE   69
+#ifdef GZIP
-#define NAME_STATE    73
+#  define GZIP_STATE  57    /* gzip header -> BUSY_STATE | EXTRA_STATE */
-#define COMMENT_STATE 91
+#endif
-#define HCRC_STATE   103
+#define EXTRA_STATE   69    /* gzip extra block -> NAME_STATE */
-#define BUSY_STATE   113
+#define NAME_STATE    73    /* gzip file name -> COMMENT_STATE */
-#define FINISH_STATE 666
+#define COMMENT_STATE 91    /* gzip comment -> HCRC_STATE */
 #define HCRC_STATE   103    /* gzip header CRC -> BUSY_STATE */
 #define BUSY_STATE   113    /* deflate -> FINISH_STATE */
 #define FINISH_STATE 666    /* stream complete */
 /* Stream status */
@@ -83,7 +86,7 @@ typedef struct static_tree_desc_s  static_tree_desc;
 typedef struct tree_desc_s {
    ct_data *dyn_tree;           /* the dynamic tree */
    int     max_code;            /* largest code with non zero frequency */
-    static_tree_desc *stat_desc; /* the corresponding static tree */
+    const static_tree_desc *stat_desc;  /* the corresponding static tree */
 } FAR tree_desc;
 typedef ush Pos;
@@ -100,10 +103,10 @@ typedef struct internal_state {
    Bytef *pending_buf;  /* output still pending */
    ulg   pending_buf_size; /* size of pending_buf */
    Bytef *pending_out;  /* next pending byte to output to the stream */
-    uInt   pending;      /* nb of bytes in the pending buffer */
+    ulg   pending;       /* nb of bytes in the pending buffer */
    int   wrap;          /* bit 0 true for zlib, bit 1 true for gzip */
    gz_headerp  gzhead;  /* gzip header information to write */
-    uInt   gzindex;      /* where in extra, name, or comment */
+    ulg   gzindex;       /* where in extra, name, or comment */
    Byte  method;        /* can only be DEFLATED */
    int   last_flush;    /* value of flush param for previous deflate call */
@@ -249,7 +252,7 @@ typedef struct internal_state {
    uInt matches;       /* number of string matches in current block */
    uInt insert;        /* bytes at end of window left to insert */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    ulg compressed_len; /* total bit length of compressed file mod 2^32 */
    ulg bits_sent;      /* bit length of compressed data sent mod 2^32 */
 #endif
@@ -275,7 +278,7 @@ typedef struct internal_state {
 /* Output a byte on the stream.
 * IN assertion: there is enough room in pending_buf.
 */
-#define put_byte(s, c) {s->pending_buf[s->pending++] = (c);}
+#define put_byte(s, c) {s->pending_buf[s->pending++] = (Bytef)(c);}
 #define MIN_LOOKAHEAD (MAX_MATCH+MIN_MATCH+1)
@@ -309,7 +312,7 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
 * used.
 */
-#ifndef DEBUG
+#ifndef ZLIB_DEBUG
 /* Inline versions of _tr_tally for speed: */
 #if defined(GEN_TREES_H) || !defined(STDC)
@@ -328,8 +331,8 @@ void ZLIB_INTERNAL _tr_stored_block OF((deflate_state *s, charf *buf,
    flush = (s->last_lit == s->lit_bufsize-1); \
   }
 # define _tr_tally_dist(s, distance, length, flush) \
-  { uch len = (length); \
+  { uch len = (uch)(length); \
-    ush dist = (distance); \
+    ush dist = (ush)(distance); \
    s->d_buf[s->last_lit] = dist; \
    s->l_buf[s->last_lit++] = len; \
    dist--; \
--- a/compat/zlib/doc/algorithm.txt
+++ b/compat/zlib/doc/algorithm.txt
@@ -1,209 +0,0 @@
 1. Compression algorithm (deflate)
 The deflation algorithm used by gzip (also zip and zlib) is a variation of
 LZ77 (Lempel-Ziv 1977, see reference below). It finds duplicated strings in
 the input data.  The second occurrence of a string is replaced by a
 pointer to the previous string, in the form of a pair (distance,
 length).  Distances are limited to 32K bytes, and lengths are limited
 to 258 bytes. When a string does not occur anywhere in the previous
 32K bytes, it is emitted as a sequence of literal bytes.  (In this
 description, `string' must be taken as an arbitrary sequence of bytes,
 and is not restricted to printable characters.)
 Literals or match lengths are compressed with one Huffman tree, and
 match distances are compressed with another tree. The trees are stored
 in a compact form at the start of each block. The blocks can have any
 size (except that the compressed data for one block must fit in
 available memory). A block is terminated when deflate() determines that
 it would be useful to start another block with fresh trees. (This is
 somewhat similar to the behavior of LZW-based _compress_.)
 Duplicated strings are found using a hash table. All input strings of
 length 3 are inserted in the hash table. A hash index is computed for
 the next 3 bytes. If the hash chain for this index is not empty, all
 strings in the chain are compared with the current input string, and
 the longest match is selected.
 The hash chains are searched starting with the most recent strings, to
 favor small distances and thus take advantage of the Huffman encoding.
 The hash chains are singly linked. There are no deletions from the
 hash chains, the algorithm simply discards matches that are too old.
 To avoid a worst-case situation, very long hash chains are arbitrarily
 truncated at a certain length, determined by a runtime option (level
 parameter of deflateInit). So deflate() does not always find the longest
 possible match but generally finds a match which is long enough.
 deflate() also defers the selection of matches with a lazy evaluation
 mechanism. After a match of length N has been found, deflate() searches for
 a longer match at the next input byte. If a longer match is found, the
 previous match is truncated to a length of one (thus producing a single
 literal byte) and the process of lazy evaluation begins again. Otherwise,
 the original match is kept, and the next match search is attempted only N
 steps later.
 The lazy match evaluation is also subject to a runtime parameter. If
 the current match is long enough, deflate() reduces the search for a longer
 match, thus speeding up the whole process. If compression ratio is more
 important than speed, deflate() attempts a complete second search even if
 the first match is already long enough.
 The lazy match evaluation is not performed for the fastest compression
 modes (level parameter 1 to 3). For these fast modes, new strings
 are inserted in the hash table only when no match was found, or
 when the match is not too long. This degrades the compression ratio
 but saves time since there are both fewer insertions and fewer searches.
 2. Decompression algorithm (inflate)
 2.1 Introduction
 The key question is how to represent a Huffman code (or any prefix code) so
 that you can decode fast.  The most important characteristic is that shorter
 codes are much more common than longer codes, so pay attention to decoding the
 short codes fast, and let the long codes take longer to decode.
 inflate() sets up a first level table that covers some number of bits of
 input less than the length of longest code.  It gets that many bits from the
 stream, and looks it up in the table.  The table will tell if the next
 code is that many bits or less and how many, and if it is, it will tell
 the value, else it will point to the next level table for which inflate()
 grabs more bits and tries to decode a longer code.
 How many bits to make the first lookup is a tradeoff between the time it
 takes to decode and the time it takes to build the table.  If building the
 table took no time (and if you had infinite memory), then there would only
 be a first level table to cover all the way to the longest code.  However,
 building the table ends up taking a lot longer for more bits since short
 codes are replicated many times in such a table.  What inflate() does is
 simply to make the number of bits in the first table a variable, and  then
 to set that variable for the maximum speed.
 For inflate, which has 286 possible codes for the literal/length tree, the size
 of the first table is nine bits.  Also the distance trees have 30 possible
 values, and the size of the first table is six bits.  Note that for each of
 those cases, the table ended up one bit longer than the ``average'' code
 length, i.e. the code length of an approximately flat code which would be a
 little more than eight bits for 286 symbols and a little less than five bits
 for 30 symbols.
 2.2 More details on the inflate table lookup
 Ok, you want to know what this cleverly obfuscated inflate tree actually
 looks like.  You are correct that it's not a Huffman tree.  It is simply a
 lookup table for the first, let's say, nine bits of a Huffman symbol.  The
 symbol could be as short as one bit or as long as 15 bits.  If a particular
 symbol is shorter than nine bits, then that symbol's translation is duplicated
 in all those entries that start with that symbol's bits.  For example, if the
 symbol is four bits, then it's duplicated 32 times in a nine-bit table.  If a
 symbol is nine bits long, it appears in the table once.
 If the symbol is longer than nine bits, then that entry in the table points
 to another similar table for the remaining bits.  Again, there are duplicated
 entries as needed.  The idea is that most of the time the symbol will be short
 and there will only be one table look up.  (That's whole idea behind data
 compression in the first place.)  For the less frequent long symbols, there
 will be two lookups.  If you had a compression method with really long
 symbols, you could have as many levels of lookups as is efficient.  For
 inflate, two is enough.
 So a table entry either points to another table (in which case nine bits in
 the above example are gobbled), or it contains the translation for the symbol
 and the number of bits to gobble.  Then you start again with the next
 ungobbled bit.
 You may wonder: why not just have one lookup table for how ever many bits the
 longest symbol is?  The reason is that if you do that, you end up spending
 more time filling in duplicate symbol entries than you do actually decoding.
 At least for deflate's output that generates new trees every several 10's of
 kbytes.  You can imagine that filling in a 2^15 entry table for a 15-bit code
 would take too long if you're only decoding several thousand symbols.  At the
 other extreme, you could make a new table for every bit in the code.  In fact,
 that's essentially a Huffman tree.  But then you spend too much time
 traversing the tree while decoding, even for short symbols.
 So the number of bits for the first lookup table is a trade of the time to
 fill out the table vs. the time spent looking at the second level and above of
 the table.
 Here is an example, scaled down:
 The code being decoded, with 10 symbols, from 1 to 6 bits long:
 A: 0
 B: 10
 C: 1100
 D: 11010
 E: 11011
 F: 11100
 G: 11101
 H: 11110
 I: 111110
 J: 111111
 Let's make the first table three bits long (eight entries):
 000: A,1
 001: A,1
 010: A,1
 011: A,1
 100: B,2
 101: B,2
 110: -> table X (gobble 3 bits)
 111: -> table Y (gobble 3 bits)
 Each entry is what the bits decode as and how many bits that is, i.e. how
 many bits to gobble.  Or the entry points to another table, with the number of
 bits to gobble implicit in the size of the table.
 Table X is two bits long since the longest code starting with 110 is five bits
 long:
 00: C,1
 01: C,1
 10: D,2
 11: E,2
 Table Y is three bits long since the longest code starting with 111 is six
 bits long:
 000: F,2
 001: F,2
 010: G,2
 011: G,2
 100: H,2
 101: H,2
 110: I,3
 111: J,3
 So what we have here are three tables with a total of 20 entries that had to
 be constructed.  That's compared to 64 entries for a single table.  Or
 compared to 16 entries for a Huffman tree (six two entry tables and one four
 entry table).  Assuming that the code ideally represents the probability of
 the symbols, it takes on the average 1.25 lookups per symbol.  That's compared
 to one lookup for the single table, or 1.66 lookups per symbol for the
 Huffman tree.
 There, I think that gives you a picture of what's going on.  For inflate, the
 meaning of a particular symbol is often more than just a letter.  It can be a
 byte (a "literal"), or it can be either a length or a distance which
 indicates a base value and a number of bits to fetch after the code that is
 added to the base value.  Or it might be the special end-of-block code.  The
 data structures created in inftrees.c try to encode all that information
 compactly in the tables.
 Jean-loup Gailly        Mark Adler
 jloup@gzip.org          madler@alumni.caltech.edu
 References:
 [LZ77] Ziv J., Lempel A., ``A Universal Algorithm for Sequential Data
 Compression,'' IEEE Transactions on Information Theory, Vol. 23, No. 3,
 pp. 337-343.
 ``DEFLATE Compressed Data Format Specification'' available in
 http://tools.ietf.org/html/rfc1951
--- a/compat/zlib/doc/rfc1950.txt
+++ b/compat/zlib/doc/rfc1950.txt
@@ -1,619 +0,0 @@
 Network Working Group                                         P. Deutsch
 Request for Comments: 1950                           Aladdin Enterprises
 Category: Informational                                      J-L. Gailly
                                                                Info-ZIP
                                                                May 1996
         ZLIB Compressed Data Format Specification version 3.3
 Status of This Memo
   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.
 IESG Note:
   The IESG takes no position on the validity of any Intellectual
   Property Rights statements contained in this document.
 Notices
   Copyright (c) 1996 L. Peter Deutsch and Jean-Loup Gailly
   Permission is granted to copy and distribute this document for any
   purpose and without charge, including translations into other
   languages and incorporation into compilations, provided that the
   copyright notice and this notice are preserved, and that any
   substantive changes or deletions from the original are clearly
   marked.
   A pointer to the latest version of this and related documentation in
   HTML format can be found at the URL
   <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
 Abstract
   This specification defines a lossless compressed data format.  The
   data can be produced or consumed, even for an arbitrarily long
   sequentially presented input data stream, using only an a priori
   bounded amount of intermediate storage.  The format presently uses
   the DEFLATE compression method but can be easily extended to use
   other compression methods.  It can be implemented readily in a manner
   not covered by patents.  This specification also defines the ADLER-32
   checksum (an extension and improvement of the Fletcher checksum),
   used for detection of data corruption, and provides an algorithm for
   computing it.
 Deutsch & Gailly             Informational                      [Page 1]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
 Table of Contents
   1. Introduction ................................................... 2
      1.1. Purpose ................................................... 2
      1.2. Intended audience ......................................... 3
      1.3. Scope ..................................................... 3
      1.4. Compliance ................................................ 3
      1.5.  Definitions of terms and conventions used ................ 3
      1.6. Changes from previous versions ............................ 3
   2. Detailed specification ......................................... 3
      2.1. Overall conventions ....................................... 3
      2.2. Data format ............................................... 4
      2.3. Compliance ................................................ 7
   3. References ..................................................... 7
   4. Source code .................................................... 8
   5. Security Considerations ........................................ 8
   6. Acknowledgements ............................................... 8
   7. Authors' Addresses ............................................. 8
   8. Appendix: Rationale ............................................ 9
   9. Appendix: Sample code ..........................................10
 1. Introduction
   1.1. Purpose
      The purpose of this specification is to define a lossless
      compressed data format that:
          * Is independent of CPU type, operating system, file system,
            and character set, and hence can be used for interchange;
          * Can be produced or consumed, even for an arbitrarily long
            sequentially presented input data stream, using only an a
            priori bounded amount of intermediate storage, and hence can
            be used in data communications or similar structures such as
            Unix filters;
          * Can use a number of different compression methods;
          * Can be implemented readily in a manner not covered by
            patents, and hence can be practiced freely.
      The data format defined by this specification does not attempt to
      allow random access to compressed data.
 Deutsch & Gailly             Informational                      [Page 2]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
   1.2. Intended audience
      This specification is intended for use by implementors of software
      to compress data into zlib format and/or decompress data from zlib
      format.
      The text of the specification assumes a basic background in
      programming at the level of bits and other primitive data
      representations.
   1.3. Scope
      The specification specifies a compressed data format that can be
      used for in-memory compression of a sequence of arbitrary bytes.
   1.4. Compliance
      Unless otherwise indicated below, a compliant decompressor must be
      able to accept and decompress any data set that conforms to all
      the specifications presented here; a compliant compressor must
      produce data sets that conform to all the specifications presented
      here.
   1.5.  Definitions of terms and conventions used
      byte: 8 bits stored or transmitted as a unit (same as an octet).
      (For this specification, a byte is exactly 8 bits, even on
      machines which store a character on a number of bits different
      from 8.) See below, for the numbering of bits within a byte.
   1.6. Changes from previous versions
      Version 3.1 was the first public release of this specification.
      In version 3.2, some terminology was changed and the Adler-32
      sample code was rewritten for clarity.  In version 3.3, the
      support for a preset dictionary was introduced, and the
      specification was converted to RFC style.
 2. Detailed specification
   2.1. Overall conventions
      In the diagrams below, a box like this:
         +---+
         |   | <-- the vertical bars might be missing
         +---+
 Deutsch & Gailly             Informational                      [Page 3]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
      represents one byte; a box like this:
         +==============+
         |              |
         +==============+
      represents a variable number of bytes.
      Bytes stored within a computer do not have a "bit order", since
      they are always treated as a unit.  However, a byte considered as
      an integer between 0 and 255 does have a most- and least-
      significant bit, and since we write numbers with the most-
      significant digit on the left, we also write bytes with the most-
      significant bit on the left.  In the diagrams below, we number the
      bits of a byte so that bit 0 is the least-significant bit, i.e.,
      the bits are numbered:
         +--------+
         |76543210|
         +--------+
      Within a computer, a number may occupy multiple bytes.  All
      multi-byte numbers in the format described here are stored with
      the MOST-significant byte first (at the lower memory address).
      For example, the decimal number 520 is stored as:
             0     1
         +--------+--------+
         |00000010|00001000|
         +--------+--------+
          ^        ^
          |        |
          |        + less significant byte = 8
          + more significant byte = 2 x 256
   2.2. Data format
      A zlib stream has the following structure:
           0   1
         +---+---+
         |CMF|FLG|   (more-->)
         +---+---+
 Deutsch & Gailly             Informational                      [Page 4]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
      (if FLG.FDICT set)
           0   1   2   3
         +---+---+---+---+
         |     DICTID    |   (more-->)
         +---+---+---+---+
         +=====================+---+---+---+---+
         |...compressed data...|    ADLER32    |
         +=====================+---+---+---+---+
      Any data which may appear after ADLER32 are not part of the zlib
      stream.
      CMF (Compression Method and flags)
         This byte is divided into a 4-bit compression method and a 4-
         bit information field depending on the compression method.
            bits 0 to 3  CM     Compression method
            bits 4 to 7  CINFO  Compression info
      CM (Compression method)
         This identifies the compression method used in the file. CM = 8
         denotes the "deflate" compression method with a window size up
         to 32K.  This is the method used by gzip and PNG (see
         references [1] and [2] in Chapter 3, below, for the reference
         documents).  CM = 15 is reserved.  It might be used in a future
         version of this specification to indicate the presence of an
         extra field before the compressed data.
      CINFO (Compression info)
         For CM = 8, CINFO is the base-2 logarithm of the LZ77 window
         size, minus eight (CINFO=7 indicates a 32K window size). Values
         of CINFO above 7 are not allowed in this version of the
         specification.  CINFO is not defined in this specification for
         CM not equal to 8.
      FLG (FLaGs)
         This flag byte is divided as follows:
            bits 0 to 4  FCHECK  (check bits for CMF and FLG)
            bit  5       FDICT   (preset dictionary)
            bits 6 to 7  FLEVEL  (compression level)
         The FCHECK value must be such that CMF and FLG, when viewed as
         a 16-bit unsigned integer stored in MSB order (CMF*256 + FLG),
         is a multiple of 31.
 Deutsch & Gailly             Informational                      [Page 5]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
      FDICT (Preset dictionary)
         If FDICT is set, a DICT dictionary identifier is present
         immediately after the FLG byte. The dictionary is a sequence of
         bytes which are initially fed to the compressor without
         producing any compressed output. DICT is the Adler-32 checksum
         of this sequence of bytes (see the definition of ADLER32
         below).  The decompressor can use this identifier to determine
         which dictionary has been used by the compressor.
      FLEVEL (Compression level)
         These flags are available for use by specific compression
         methods.  The "deflate" method (CM = 8) sets these flags as
         follows:
            0 - compressor used fastest algorithm
            1 - compressor used fast algorithm
            2 - compressor used default algorithm
            3 - compressor used maximum compression, slowest algorithm
         The information in FLEVEL is not needed for decompression; it
         is there to indicate if recompression might be worthwhile.
      compressed data
         For compression method 8, the compressed data is stored in the
         deflate compressed data format as described in the document
         "DEFLATE Compressed Data Format Specification" by L. Peter
         Deutsch. (See reference [3] in Chapter 3, below)
         Other compressed data formats are not specified in this version
         of the zlib specification.
      ADLER32 (Adler-32 checksum)
         This contains a checksum value of the uncompressed data
         (excluding any dictionary data) computed according to Adler-32
         algorithm. This algorithm is a 32-bit extension and improvement
         of the Fletcher algorithm, used in the ITU-T X.224 / ISO 8073
         standard. See references [4] and [5] in Chapter 3, below)
         Adler-32 is composed of two sums accumulated per byte: s1 is
         the sum of all bytes, s2 is the sum of all s1 values. Both sums
         are done modulo 65521. s1 is initialized to 1, s2 to zero.  The
         Adler-32 checksum is stored as s2*65536 + s1 in most-
         significant-byte first (network) order.
 Deutsch & Gailly             Informational                      [Page 6]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
   2.3. Compliance
      A compliant compressor must produce streams with correct CMF, FLG
      and ADLER32, but need not support preset dictionaries.  When the
      zlib data format is used as part of another standard data format,
      the compressor may use only preset dictionaries that are specified
      by this other data format.  If this other format does not use the
      preset dictionary feature, the compressor must not set the FDICT
      flag.
      A compliant decompressor must check CMF, FLG, and ADLER32, and
      provide an error indication if any of these have incorrect values.
      A compliant decompressor must give an error indication if CM is
      not one of the values defined in this specification (only the
      value 8 is permitted in this version), since another value could
      indicate the presence of new features that would cause subsequent
      data to be interpreted incorrectly.  A compliant decompressor must
      give an error indication if FDICT is set and DICTID is not the
      identifier of a known preset dictionary.  A decompressor may
      ignore FLEVEL and still be compliant.  When the zlib data format
      is being used as a part of another standard format, a compliant
      decompressor must support all the preset dictionaries specified by
      the other format. When the other format does not use the preset
      dictionary feature, a compliant decompressor must reject any
      stream in which the FDICT flag is set.
 3. References
   [1] Deutsch, L.P.,"GZIP Compressed Data Format Specification",
       available in ftp://ftp.uu.net/pub/archiving/zip/doc/
   [2] Thomas Boutell, "PNG (Portable Network Graphics) specification",
       available in ftp://ftp.uu.net/graphics/png/documents/
   [3] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification",
       available in ftp://ftp.uu.net/pub/archiving/zip/doc/
   [4] Fletcher, J. G., "An Arithmetic Checksum for Serial
       Transmissions," IEEE Transactions on Communications, Vol. COM-30,
       No. 1, January 1982, pp. 247-252.
   [5] ITU-T Recommendation X.224, Annex D, "Checksum Algorithms,"
       November, 1993, pp. 144, 145. (Available from
       gopher://info.itu.ch). ITU-T X.244 is also the same as ISO 8073.
 Deutsch & Gailly             Informational                      [Page 7]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
 4. Source code
   Source code for a C language implementation of a "zlib" compliant
   library is available at ftp://ftp.uu.net/pub/archiving/zip/zlib/.
 5. Security Considerations
   A decoder that fails to check the ADLER32 checksum value may be
   subject to undetected data corruption.
 6. Acknowledgements
   Trademarks cited in this document are the property of their
   respective owners.
   Jean-Loup Gailly and Mark Adler designed the zlib format and wrote
   the related software described in this specification.  Glenn
   Randers-Pehrson converted this document to RFC and HTML format.
 7. Authors' Addresses
   L. Peter Deutsch
   Aladdin Enterprises
   203 Santa Margarita Ave.
   Menlo Park, CA 94025
   Phone: (415) 322-0103 (AM only)
   FAX:   (415) 322-1734
   EMail: <ghost@aladdin.com>
   Jean-Loup Gailly
   EMail: <gzip@prep.ai.mit.edu>
   Questions about the technical content of this specification can be
   sent by email to
   Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
   Mark Adler <madler@alumni.caltech.edu>
   Editorial comments on this specification can be sent by email to
   L. Peter Deutsch <ghost@aladdin.com> and
   Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
 Deutsch & Gailly             Informational                      [Page 8]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
 8. Appendix: Rationale
   8.1. Preset dictionaries
      A preset dictionary is specially useful to compress short input
      sequences. The compressor can take advantage of the dictionary
      context to encode the input in a more compact manner. The
      decompressor can be initialized with the appropriate context by
      virtually decompressing a compressed version of the dictionary
      without producing any output. However for certain compression
      algorithms such as the deflate algorithm this operation can be
      achieved without actually performing any decompression.
      The compressor and the decompressor must use exactly the same
      dictionary. The dictionary may be fixed or may be chosen among a
      certain number of predefined dictionaries, according to the kind
      of input data. The decompressor can determine which dictionary has
      been chosen by the compressor by checking the dictionary
      identifier. This document does not specify the contents of
      predefined dictionaries, since the optimal dictionaries are
      application specific. Standard data formats using this feature of
      the zlib specification must precisely define the allowed
      dictionaries.
   8.2. The Adler-32 algorithm
      The Adler-32 algorithm is much faster than the CRC32 algorithm yet
      still provides an extremely low probability of undetected errors.
      The modulo on unsigned long accumulators can be delayed for 5552
      bytes, so the modulo operation time is negligible.  If the bytes
      are a, b, c, the second sum is 3a + 2b + c + 3, and so is position
      and order sensitive, unlike the first sum, which is just a
      checksum.  That 65521 is prime is important to avoid a possible
      large class of two-byte errors that leave the check unchanged.
      (The Fletcher checksum uses 255, which is not prime and which also
      makes the Fletcher check insensitive to single byte changes 0 <->
      255.)
      The sum s1 is initialized to 1 instead of zero to make the length
      of the sequence part of s2, so that the length does not have to be
      checked separately. (Any sequence of zeroes has a Fletcher
      checksum of zero.)
 Deutsch & Gailly             Informational                      [Page 9]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
 9. Appendix: Sample code
   The following C code computes the Adler-32 checksum of a data buffer.
   It is written for clarity, not for speed.  The sample code is in the
   ANSI C programming language. Non C users may find it easier to read
   with these hints:
      &      Bitwise AND operator.
      >>     Bitwise right shift operator. When applied to an
             unsigned quantity, as here, right shift inserts zero bit(s)
             at the left.
      <<     Bitwise left shift operator. Left shift inserts zero
             bit(s) at the right.
      ++     "n++" increments the variable n.
      %      modulo operator: a % b is the remainder of a divided by b.
      #define BASE 65521 /* largest prime smaller than 65536 */
      /*
         Update a running Adler-32 checksum with the bytes buf[0..len-1]
       and return the updated checksum. The Adler-32 checksum should be
       initialized to 1.
       Usage example:
         unsigned long adler = 1L;
         while (read_buffer(buffer, length) != EOF) {
           adler = update_adler32(adler, buffer, length);
         }
         if (adler != original_adler) error();
      */
      unsigned long update_adler32(unsigned long adler,
         unsigned char *buf, int len)
      {
        unsigned long s1 = adler & 0xffff;
        unsigned long s2 = (adler >> 16) & 0xffff;
        int n;
        for (n = 0; n < len; n++) {
          s1 = (s1 + buf[n]) % BASE;
          s2 = (s2 + s1)     % BASE;
        }
        return (s2 << 16) + s1;
      }
      /* Return the adler32 of the bytes buf[0..len-1] */
 Deutsch & Gailly             Informational                     [Page 10]
 RFC 1950       ZLIB Compressed Data Format Specification        May 1996
      unsigned long adler32(unsigned char *buf, int len)
      {
        return update_adler32(1L, buf, len);
      }
 Deutsch & Gailly             Informational                     [Page 11]
--- a/compat/zlib/doc/rfc1951.txt
+++ b/compat/zlib/doc/rfc1951.txt
@@ -1,955 +0,0 @@
 Network Working Group                                         P. Deutsch
 Request for Comments: 1951                           Aladdin Enterprises
 Category: Informational                                         May 1996
        DEFLATE Compressed Data Format Specification version 1.3
 Status of This Memo
   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.
 IESG Note:
   The IESG takes no position on the validity of any Intellectual
   Property Rights statements contained in this document.
 Notices
   Copyright (c) 1996 L. Peter Deutsch
   Permission is granted to copy and distribute this document for any
   purpose and without charge, including translations into other
   languages and incorporation into compilations, provided that the
   copyright notice and this notice are preserved, and that any
   substantive changes or deletions from the original are clearly
   marked.
   A pointer to the latest version of this and related documentation in
   HTML format can be found at the URL
   <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
 Abstract
   This specification defines a lossless compressed data format that
   compresses data using a combination of the LZ77 algorithm and Huffman
   coding, with efficiency comparable to the best currently available
   general-purpose compression methods.  The data can be produced or
   consumed, even for an arbitrarily long sequentially presented input
   data stream, using only an a priori bounded amount of intermediate
   storage.  The format can be implemented readily in a manner not
   covered by patents.
 Deutsch                      Informational                      [Page 1]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
 Table of Contents
   1. Introduction ................................................... 2
      1.1. Purpose ................................................... 2
      1.2. Intended audience ......................................... 3
      1.3. Scope ..................................................... 3
      1.4. Compliance ................................................ 3
      1.5.  Definitions of terms and conventions used ................ 3
      1.6. Changes from previous versions ............................ 4
   2. Compressed representation overview ............................. 4
   3. Detailed specification ......................................... 5
      3.1. Overall conventions ....................................... 5
          3.1.1. Packing into bytes .................................. 5
      3.2. Compressed block format ................................... 6
          3.2.1. Synopsis of prefix and Huffman coding ............... 6
          3.2.2. Use of Huffman coding in the "deflate" format ....... 7
          3.2.3. Details of block format ............................. 9
          3.2.4. Non-compressed blocks (BTYPE=00) ................... 11
          3.2.5. Compressed blocks (length and distance codes) ...... 11
          3.2.6. Compression with fixed Huffman codes (BTYPE=01) .... 12
          3.2.7. Compression with dynamic Huffman codes (BTYPE=10) .. 13
      3.3. Compliance ............................................... 14
   4. Compression algorithm details ................................. 14
   5. References .................................................... 16
   6. Security Considerations ....................................... 16
   7. Source code ................................................... 16
   8. Acknowledgements .............................................. 16
   9. Author's Address .............................................. 17
 1. Introduction
   1.1. Purpose
      The purpose of this specification is to define a lossless
      compressed data format that:
          * Is independent of CPU type, operating system, file system,
            and character set, and hence can be used for interchange;
          * Can be produced or consumed, even for an arbitrarily long
            sequentially presented input data stream, using only an a
            priori bounded amount of intermediate storage, and hence
            can be used in data communications or similar structures
            such as Unix filters;
          * Compresses data with efficiency comparable to the best
            currently available general-purpose compression methods,
            and in particular considerably better than the "compress"
            program;
          * Can be implemented readily in a manner not covered by
            patents, and hence can be practiced freely;
 Deutsch                      Informational                      [Page 2]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
          * Is compatible with the file format produced by the current
            widely used gzip utility, in that conforming decompressors
            will be able to read data produced by the existing gzip
            compressor.
      The data format defined by this specification does not attempt to:
          * Allow random access to compressed data;
          * Compress specialized data (e.g., raster graphics) as well
            as the best currently available specialized algorithms.
      A simple counting argument shows that no lossless compression
      algorithm can compress every possible input data set.  For the
      format defined here, the worst case expansion is 5 bytes per 32K-
      byte block, i.e., a size increase of 0.015% for large data sets.
      English text usually compresses by a factor of 2.5 to 3;
      executable files usually compress somewhat less; graphical data
      such as raster images may compress much more.
   1.2. Intended audience
      This specification is intended for use by implementors of software
      to compress data into "deflate" format and/or decompress data from
      "deflate" format.
      The text of the specification assumes a basic background in
      programming at the level of bits and other primitive data
      representations.  Familiarity with the technique of Huffman coding
      is helpful but not required.
   1.3. Scope
      The specification specifies a method for representing a sequence
      of bytes as a (usually shorter) sequence of bits, and a method for
      packing the latter bit sequence into bytes.
   1.4. Compliance
      Unless otherwise indicated below, a compliant decompressor must be
      able to accept and decompress any data set that conforms to all
      the specifications presented here; a compliant compressor must
      produce data sets that conform to all the specifications presented
      here.
   1.5.  Definitions of terms and conventions used
      Byte: 8 bits stored or transmitted as a unit (same as an octet).
      For this specification, a byte is exactly 8 bits, even on machines
 Deutsch                      Informational                      [Page 3]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
      which store a character on a number of bits different from eight.
      See below, for the numbering of bits within a byte.
      String: a sequence of arbitrary bytes.
   1.6. Changes from previous versions
      There have been no technical changes to the deflate format since
      version 1.1 of this specification.  In version 1.2, some
      terminology was changed.  Version 1.3 is a conversion of the
      specification to RFC style.
 2. Compressed representation overview
   A compressed data set consists of a series of blocks, corresponding
   to successive blocks of input data.  The block sizes are arbitrary,
   except that non-compressible blocks are limited to 65,535 bytes.
   Each block is compressed using a combination of the LZ77 algorithm
   and Huffman coding. The Huffman trees for each block are independent
   of those for previous or subsequent blocks; the LZ77 algorithm may
   use a reference to a duplicated string occurring in a previous block,
   up to 32K input bytes before.
   Each block consists of two parts: a pair of Huffman code trees that
   describe the representation of the compressed data part, and a
   compressed data part.  (The Huffman trees themselves are compressed
   using Huffman encoding.)  The compressed data consists of a series of
   elements of two types: literal bytes (of strings that have not been
   detected as duplicated within the previous 32K input bytes), and
   pointers to duplicated strings, where a pointer is represented as a
   pair <length, backward distance>.  The representation used in the
   "deflate" format limits distances to 32K bytes and lengths to 258
   bytes, but does not limit the size of a block, except for
   uncompressible blocks, which are limited as noted above.
   Each type of value (literals, distances, and lengths) in the
   compressed data is represented using a Huffman code, using one code
   tree for literals and lengths and a separate code tree for distances.
   The code trees for each block appear in a compact form just before
   the compressed data for that block.
 Deutsch                      Informational                      [Page 4]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
 3. Detailed specification
   3.1. Overall conventions In the diagrams below, a box like this:
         +---+
         |   | <-- the vertical bars might be missing
         +---+
      represents one byte; a box like this:
         +==============+
         |              |
         +==============+
      represents a variable number of bytes.
      Bytes stored within a computer do not have a "bit order", since
      they are always treated as a unit.  However, a byte considered as
      an integer between 0 and 255 does have a most- and least-
      significant bit, and since we write numbers with the most-
      significant digit on the left, we also write bytes with the most-
      significant bit on the left.  In the diagrams below, we number the
      bits of a byte so that bit 0 is the least-significant bit, i.e.,
      the bits are numbered:
         +--------+
         |76543210|
         +--------+
      Within a computer, a number may occupy multiple bytes.  All
      multi-byte numbers in the format described here are stored with
      the least-significant byte first (at the lower memory address).
      For example, the decimal number 520 is stored as:
             0        1
         +--------+--------+
         |00001000|00000010|
         +--------+--------+
          ^        ^
          |        |
          |        + more significant byte = 2 x 256
          + less significant byte = 8
      3.1.1. Packing into bytes
         This document does not address the issue of the order in which
         bits of a byte are transmitted on a bit-sequential medium,
         since the final data format described here is byte- rather than
 Deutsch                      Informational                      [Page 5]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
         bit-oriented.  However, we describe the compressed block format
         in below, as a sequence of data elements of various bit
         lengths, not a sequence of bytes.  We must therefore specify
         how to pack these data elements into bytes to form the final
         compressed byte sequence:
             * Data elements are packed into bytes in order of
               increasing bit number within the byte, i.e., starting
               with the least-significant bit of the byte.
             * Data elements other than Huffman codes are packed
               starting with the least-significant bit of the data
               element.
             * Huffman codes are packed starting with the most-
               significant bit of the code.
         In other words, if one were to print out the compressed data as
         a sequence of bytes, starting with the first byte at the
         *right* margin and proceeding to the *left*, with the most-
         significant bit of each byte on the left as usual, one would be
         able to parse the result from right to left, with fixed-width
         elements in the correct MSB-to-LSB order and Huffman codes in
         bit-reversed order (i.e., with the first bit of the code in the
         relative LSB position).
   3.2. Compressed block format
      3.2.1. Synopsis of prefix and Huffman coding
         Prefix coding represents symbols from an a priori known
         alphabet by bit sequences (codes), one code for each symbol, in
         a manner such that different symbols may be represented by bit
         sequences of different lengths, but a parser can always parse
         an encoded string unambiguously symbol-by-symbol.
         We define a prefix code in terms of a binary tree in which the
         two edges descending from each non-leaf node are labeled 0 and
         1 and in which the leaf nodes correspond one-for-one with (are
         labeled with) the symbols of the alphabet; then the code for a
         symbol is the sequence of 0's and 1's on the edges leading from
         the root to the leaf labeled with that symbol.  For example:
 Deutsch                      Informational                      [Page 6]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
                          /\              Symbol    Code
                         0  1             ------    ----
                        /    \                A      00
                       /\     B               B       1
                      0  1                    C     011
                     /    \                   D     010
                    A     /\
                         0  1
                        /    \
                       D      C
         A parser can decode the next symbol from an encoded input
         stream by walking down the tree from the root, at each step
         choosing the edge corresponding to the next input bit.
         Given an alphabet with known symbol frequencies, the Huffman
         algorithm allows the construction of an optimal prefix code
         (one which represents strings with those symbol frequencies
         using the fewest bits of any possible prefix codes for that
         alphabet).  Such a code is called a Huffman code.  (See
         reference [1] in Chapter 5, references for additional
         information on Huffman codes.)
         Note that in the "deflate" format, the Huffman codes for the
         various alphabets must not exceed certain maximum code lengths.
         This constraint complicates the algorithm for computing code
         lengths from symbol frequencies.  Again, see Chapter 5,
         references for details.
      3.2.2. Use of Huffman coding in the "deflate" format
         The Huffman codes used for each alphabet in the "deflate"
         format have two additional rules:
             * All codes of a given bit length have lexicographically
               consecutive values, in the same order as the symbols
               they represent;
             * Shorter codes lexicographically precede longer codes.
 Deutsch                      Informational                      [Page 7]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
         We could recode the example above to follow this rule as
         follows, assuming that the order of the alphabet is ABCD:
            Symbol  Code
            ------  ----
            A       10
            B       0
            C       110
            D       111
         I.e., 0 precedes 10 which precedes 11x, and 110 and 111 are
         lexicographically consecutive.
         Given this rule, we can define the Huffman code for an alphabet
         just by giving the bit lengths of the codes for each symbol of
         the alphabet in order; this is sufficient to determine the
         actual codes.  In our example, the code is completely defined
         by the sequence of bit lengths (2, 1, 3, 3).  The following
         algorithm generates the codes as integers, intended to be read
         from most- to least-significant bit.  The code lengths are
         initially in tree[I].Len; the codes are produced in
         tree[I].Code.
         1)  Count the number of codes for each code length.  Let
             bl_count[N] be the number of codes of length N, N >= 1.
         2)  Find the numerical value of the smallest code for each
             code length:
                code = 0;
                bl_count[0] = 0;
                for (bits = 1; bits <= MAX_BITS; bits++) {
                    code = (code + bl_count[bits-1]) << 1;
                    next_code[bits] = code;
                }
         3)  Assign numerical values to all codes, using consecutive
             values for all codes of the same length with the base
             values determined at step 2. Codes that are never used
             (which have a bit length of zero) must not be assigned a
             value.
                for (n = 0;  n <= max_code; n++) {
                    len = tree[n].Len;
                    if (len != 0) {
                        tree[n].Code = next_code[len];
                        next_code[len]++;
                    }
 Deutsch                      Informational                      [Page 8]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
                }
         Example:
         Consider the alphabet ABCDEFGH, with bit lengths (3, 3, 3, 3,
         3, 2, 4, 4).  After step 1, we have:
            N      bl_count[N]
            -      -----------
            2      1
            3      5
            4      2
         Step 2 computes the following next_code values:
            N      next_code[N]
            -      ------------
            1      0
            2      0
            3      2
            4      14
         Step 3 produces the following code values:
            Symbol Length   Code
            ------ ------   ----
            A       3        010
            B       3        011
            C       3        100
            D       3        101
            E       3        110
            F       2         00
            G       4       1110
            H       4       1111
      3.2.3. Details of block format
         Each block of compressed data begins with 3 header bits
         containing the following data:
            first bit       BFINAL
            next 2 bits     BTYPE
         Note that the header bits do not necessarily begin on a byte
         boundary, since a block does not necessarily occupy an integral
         number of bytes.
 Deutsch                      Informational                      [Page 9]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
         BFINAL is set if and only if this is the last block of the data
         set.
         BTYPE specifies how the data are compressed, as follows:
            00 - no compression
            01 - compressed with fixed Huffman codes
            10 - compressed with dynamic Huffman codes
            11 - reserved (error)
         The only difference between the two compressed cases is how the
         Huffman codes for the literal/length and distance alphabets are
         defined.
         In all cases, the decoding algorithm for the actual data is as
         follows:
            do
               read block header from input stream.
               if stored with no compression
                  skip any remaining bits in current partially
                     processed byte
                  read LEN and NLEN (see next section)
                  copy LEN bytes of data to output
               otherwise
                  if compressed with dynamic Huffman codes
                     read representation of code trees (see
                        subsection below)
                  loop (until end of block code recognized)
                     decode literal/length value from input stream
                     if value < 256
                        copy value (literal byte) to output stream
                     otherwise
                        if value = end of block (256)
                           break from loop
                        otherwise (value = 257..285)
                           decode distance from input stream
                           move backwards distance bytes in the output
                           stream, and copy length bytes from this
                           position to the output stream.
                  end loop
            while not last block
         Note that a duplicated string reference may refer to a string
         in a previous block; i.e., the backward distance may cross one
         or more block boundaries.  However a distance cannot refer past
         the beginning of the output stream.  (An application using a
 Deutsch                      Informational                     [Page 10]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
         preset dictionary might discard part of the output stream; a
         distance can refer to that part of the output stream anyway)
         Note also that the referenced string may overlap the current
         position; for example, if the last 2 bytes decoded have values
         X and Y, a string reference with <length = 5, distance = 2>
         adds X,Y,X,Y,X to the output stream.
         We now specify each compression method in turn.
      3.2.4. Non-compressed blocks (BTYPE=00)
         Any bits of input up to the next byte boundary are ignored.
         The rest of the block consists of the following information:
              0   1   2   3   4...
            +---+---+---+---+================================+
            |  LEN  | NLEN  |... LEN bytes of literal data...|
            +---+---+---+---+================================+
         LEN is the number of data bytes in the block.  NLEN is the
         one's complement of LEN.
      3.2.5. Compressed blocks (length and distance codes)
         As noted above, encoded data blocks in the "deflate" format
         consist of sequences of symbols drawn from three conceptually
         distinct alphabets: either literal bytes, from the alphabet of
         byte values (0..255), or <length, backward distance> pairs,
         where the length is drawn from (3..258) and the distance is
         drawn from (1..32,768).  In fact, the literal and length
         alphabets are merged into a single alphabet (0..285), where
         values 0..255 represent literal bytes, the value 256 indicates
         end-of-block, and values 257..285 represent length codes
         (possibly in conjunction with extra bits following the symbol
         code) as follows:
 Deutsch                      Informational                     [Page 11]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
                 Extra               Extra               Extra
            Code Bits Length(s) Code Bits Lengths   Code Bits Length(s)
            ---- ---- ------     ---- ---- -------   ---- ---- -------
             257   0     3       267   1   15,16     277   4   67-82
             258   0     4       268   1   17,18     278   4   83-98
             259   0     5       269   2   19-22     279   4   99-114
             260   0     6       270   2   23-26     280   4  115-130
             261   0     7       271   2   27-30     281   5  131-162
             262   0     8       272   2   31-34     282   5  163-194
             263   0     9       273   3   35-42     283   5  195-226
             264   0    10       274   3   43-50     284   5  227-257
             265   1  11,12      275   3   51-58     285   0    258
             266   1  13,14      276   3   59-66
         The extra bits should be interpreted as a machine integer
         stored with the most-significant bit first, e.g., bits 1110
         represent the value 14.
                  Extra           Extra               Extra
             Code Bits Dist  Code Bits   Dist     Code Bits Distance
             ---- ---- ----  ---- ----  ------    ---- ---- --------
               0   0    1     10   4     33-48    20    9   1025-1536
               1   0    2     11   4     49-64    21    9   1537-2048
               2   0    3     12   5     65-96    22   10   2049-3072
               3   0    4     13   5     97-128   23   10   3073-4096
               4   1   5,6    14   6    129-192   24   11   4097-6144
               5   1   7,8    15   6    193-256   25   11   6145-8192
               6   2   9-12   16   7    257-384   26   12  8193-12288
               7   2  13-16   17   7    385-512   27   12 12289-16384
               8   3  17-24   18   8    513-768   28   13 16385-24576
               9   3  25-32   19   8   769-1024   29   13 24577-32768
      3.2.6. Compression with fixed Huffman codes (BTYPE=01)
         The Huffman codes for the two alphabets are fixed, and are not
         represented explicitly in the data.  The Huffman code lengths
         for the literal/length alphabet are:
                   Lit Value    Bits        Codes
                   ---------    ----        -----
                     0 - 143     8          00110000 through
                                            10111111
                   144 - 255     9          110010000 through
                                            111111111
                   256 - 279     7          0000000 through
                                            0010111
                   280 - 287     8          11000000 through
                                            11000111
 Deutsch                      Informational                     [Page 12]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
         The code lengths are sufficient to generate the actual codes,
         as described above; we show the codes in the table for added
         clarity.  Literal/length values 286-287 will never actually
         occur in the compressed data, but participate in the code
         construction.
         Distance codes 0-31 are represented by (fixed-length) 5-bit
         codes, with possible additional bits as shown in the table
         shown in Paragraph 3.2.5, above.  Note that distance codes 30-
         31 will never actually occur in the compressed data.
      3.2.7. Compression with dynamic Huffman codes (BTYPE=10)
         The Huffman codes for the two alphabets appear in the block
         immediately after the header bits and before the actual
         compressed data, first the literal/length code and then the
         distance code.  Each code is defined by a sequence of code
         lengths, as discussed in Paragraph 3.2.2, above.  For even
         greater compactness, the code length sequences themselves are
         compressed using a Huffman code.  The alphabet for code lengths
         is as follows:
               0 - 15: Represent code lengths of 0 - 15
                   16: Copy the previous code length 3 - 6 times.
                       The next 2 bits indicate repeat length
                             (0 = 3, ... , 3 = 6)
                          Example:  Codes 8, 16 (+2 bits 11),
                                    16 (+2 bits 10) will expand to
                                    12 code lengths of 8 (1 + 6 + 5)
                   17: Repeat a code length of 0 for 3 - 10 times.
                       (3 bits of length)
                   18: Repeat a code length of 0 for 11 - 138 times
                       (7 bits of length)
         A code length of 0 indicates that the corresponding symbol in
         the literal/length or distance alphabet will not occur in the
         block, and should not participate in the Huffman code
         construction algorithm given earlier.  If only one distance
         code is used, it is encoded using one bit, not zero bits; in
         this case there is a single code length of one, with one unused
         code.  One distance code of zero bits means that there are no
         distance codes used at all (the data is all literals).
         We can now define the format of the block:
               5 Bits: HLIT, # of Literal/Length codes - 257 (257 - 286)
               5 Bits: HDIST, # of Distance codes - 1        (1 - 32)
               4 Bits: HCLEN, # of Code Length codes - 4     (4 - 19)
 Deutsch                      Informational                     [Page 13]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
               (HCLEN + 4) x 3 bits: code lengths for the code length
                  alphabet given just above, in the order: 16, 17, 18,
                  0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
                  These code lengths are interpreted as 3-bit integers
                  (0-7); as above, a code length of 0 means the
                  corresponding symbol (literal/length or distance code
                  length) is not used.
               HLIT + 257 code lengths for the literal/length alphabet,
                  encoded using the code length Huffman code
               HDIST + 1 code lengths for the distance alphabet,
                  encoded using the code length Huffman code
               The actual compressed data of the block,
                  encoded using the literal/length and distance Huffman
                  codes
               The literal/length symbol 256 (end of data),
                  encoded using the literal/length Huffman code
         The code length repeat codes can cross from HLIT + 257 to the
         HDIST + 1 code lengths.  In other words, all code lengths form
         a single sequence of HLIT + HDIST + 258 values.
   3.3. Compliance
      A compressor may limit further the ranges of values specified in
      the previous section and still be compliant; for example, it may
      limit the range of backward pointers to some value smaller than
      32K.  Similarly, a compressor may limit the size of blocks so that
      a compressible block fits in memory.
      A compliant decompressor must accept the full range of possible
      values defined in the previous section, and must accept blocks of
      arbitrary size.
 4. Compression algorithm details
   While it is the intent of this document to define the "deflate"
   compressed data format without reference to any particular
   compression algorithm, the format is related to the compressed
   formats produced by LZ77 (Lempel-Ziv 1977, see reference [2] below);
   since many variations of LZ77 are patented, it is strongly
   recommended that the implementor of a compressor follow the general
   algorithm presented here, which is known not to be patented per se.
   The material in this section is not part of the definition of the
 Deutsch                      Informational                     [Page 14]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
   specification per se, and a compressor need not follow it in order to
   be compliant.
   The compressor terminates a block when it determines that starting a
   new block with fresh trees would be useful, or when the block size
   fills up the compressor's block buffer.
   The compressor uses a chained hash table to find duplicated strings,
   using a hash function that operates on 3-byte sequences.  At any
   given point during compression, let XYZ be the next 3 input bytes to
   be examined (not necessarily all different, of course).  First, the
   compressor examines the hash chain for XYZ.  If the chain is empty,
   the compressor simply writes out X as a literal byte and advances one
   byte in the input.  If the hash chain is not empty, indicating that
   the sequence XYZ (or, if we are unlucky, some other 3 bytes with the
   same hash function value) has occurred recently, the compressor
   compares all strings on the XYZ hash chain with the actual input data
   sequence starting at the current point, and selects the longest
   match.
   The compressor searches the hash chains starting with the most recent
   strings, to favor small distances and thus take advantage of the
   Huffman encoding.  The hash chains are singly linked. There are no
   deletions from the hash chains; the algorithm simply discards matches
   that are too old.  To avoid a worst-case situation, very long hash
   chains are arbitrarily truncated at a certain length, determined by a
   run-time parameter.
   To improve overall compression, the compressor optionally defers the
   selection of matches ("lazy matching"): after a match of length N has
   been found, the compressor searches for a longer match starting at
   the next input byte.  If it finds a longer match, it truncates the
   previous match to a length of one (thus producing a single literal
   byte) and then emits the longer match.  Otherwise, it emits the
   original match, and, as described above, advances N bytes before
   continuing.
   Run-time parameters also control this "lazy match" procedure.  If
   compression ratio is most important, the compressor attempts a
   complete second search regardless of the length of the first match.
   In the normal case, if the current match is "long enough", the
   compressor reduces the search for a longer match, thus speeding up
   the process.  If speed is most important, the compressor inserts new
   strings in the hash table only when no match was found, or when the
   match is not "too long".  This degrades the compression ratio but
   saves time since there are both fewer insertions and fewer searches.
 Deutsch                      Informational                     [Page 15]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
 5. References
   [1] Huffman, D. A., "A Method for the Construction of Minimum
       Redundancy Codes", Proceedings of the Institute of Radio
       Engineers, September 1952, Volume 40, Number 9, pp. 1098-1101.
   [2] Ziv J., Lempel A., "A Universal Algorithm for Sequential Data
       Compression", IEEE Transactions on Information Theory, Vol. 23,
       No. 3, pp. 337-343.
   [3] Gailly, J.-L., and Adler, M., ZLIB documentation and sources,
       available in ftp://ftp.uu.net/pub/archiving/zip/doc/
   [4] Gailly, J.-L., and Adler, M., GZIP documentation and sources,
       available as gzip-*.tar in ftp://prep.ai.mit.edu/pub/gnu/
   [5] Schwartz, E. S., and Kallick, B. "Generating a canonical prefix
       encoding." Comm. ACM, 7,3 (Mar. 1964), pp. 166-169.
   [6] Hirschberg and Lelewer, "Efficient decoding of prefix codes,"
       Comm. ACM, 33,4, April 1990, pp. 449-459.
 6. Security Considerations
   Any data compression method involves the reduction of redundancy in
   the data.  Consequently, any corruption of the data is likely to have
   severe effects and be difficult to correct.  Uncompressed text, on
   the other hand, will probably still be readable despite the presence
   of some corrupted bytes.
   It is recommended that systems using this data format provide some
   means of validating the integrity of the compressed data.  See
   reference [3], for example.
 7. Source code
   Source code for a C language implementation of a "deflate" compliant
   compressor and decompressor is available within the zlib package at
   ftp://ftp.uu.net/pub/archiving/zip/zlib/.
 8. Acknowledgements
   Trademarks cited in this document are the property of their
   respective owners.
   Phil Katz designed the deflate format.  Jean-Loup Gailly and Mark
   Adler wrote the related software described in this specification.
   Glenn Randers-Pehrson converted this document to RFC and HTML format.
 Deutsch                      Informational                     [Page 16]
 RFC 1951      DEFLATE Compressed Data Format Specification      May 1996
 9. Author's Address
   L. Peter Deutsch
   Aladdin Enterprises
   203 Santa Margarita Ave.
   Menlo Park, CA 94025
   Phone: (415) 322-0103 (AM only)
   FAX:   (415) 322-1734
   EMail: <ghost@aladdin.com>
   Questions about the technical content of this specification can be
   sent by email to:
   Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
   Mark Adler <madler@alumni.caltech.edu>
   Editorial comments on this specification can be sent by email to:
   L. Peter Deutsch <ghost@aladdin.com> and
   Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
 Deutsch                      Informational                     [Page 17]
--- a/compat/zlib/doc/rfc1952.txt
+++ b/compat/zlib/doc/rfc1952.txt
@@ -1,675 +0,0 @@
 Network Working Group                                         P. Deutsch
 Request for Comments: 1952                           Aladdin Enterprises
 Category: Informational                                         May 1996
               GZIP file format specification version 4.3
 Status of This Memo
   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.
 IESG Note:
   The IESG takes no position on the validity of any Intellectual
   Property Rights statements contained in this document.
 Notices
   Copyright (c) 1996 L. Peter Deutsch
   Permission is granted to copy and distribute this document for any
   purpose and without charge, including translations into other
   languages and incorporation into compilations, provided that the
   copyright notice and this notice are preserved, and that any
   substantive changes or deletions from the original are clearly
   marked.
   A pointer to the latest version of this and related documentation in
   HTML format can be found at the URL
   <ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html>.
 Abstract
   This specification defines a lossless compressed data format that is
   compatible with the widely used GZIP utility.  The format includes a
   cyclic redundancy check value for detecting data corruption.  The
   format presently uses the DEFLATE method of compression but can be
   easily extended to use other compression methods.  The format can be
   implemented readily in a manner not covered by patents.
 Deutsch                      Informational                      [Page 1]
 RFC 1952             GZIP File Format Specification             May 1996
 Table of Contents
   1. Introduction ................................................... 2
      1.1. Purpose ................................................... 2
      1.2. Intended audience ......................................... 3
      1.3. Scope ..................................................... 3
      1.4. Compliance ................................................ 3
      1.5. Definitions of terms and conventions used ................. 3
      1.6. Changes from previous versions ............................ 3
   2. Detailed specification ......................................... 4
      2.1. Overall conventions ....................................... 4
      2.2. File format ............................................... 5
      2.3. Member format ............................................. 5
          2.3.1. Member header and trailer ........................... 6
              2.3.1.1. Extra field ................................... 8
              2.3.1.2. Compliance .................................... 9
      3. References .................................................. 9
      4. Security Considerations .................................... 10
      5. Acknowledgements ........................................... 10
      6. Author's Address ........................................... 10
      7. Appendix: Jean-Loup Gailly's gzip utility .................. 11
      8. Appendix: Sample CRC Code .................................. 11
 1. Introduction
   1.1. Purpose
      The purpose of this specification is to define a lossless
      compressed data format that:
          * Is independent of CPU type, operating system, file system,
            and character set, and hence can be used for interchange;
          * Can compress or decompress a data stream (as opposed to a
            randomly accessible file) to produce another data stream,
            using only an a priori bounded amount of intermediate
            storage, and hence can be used in data communications or
            similar structures such as Unix filters;
          * Compresses data with efficiency comparable to the best
            currently available general-purpose compression methods,
            and in particular considerably better than the "compress"
            program;
          * Can be implemented readily in a manner not covered by
            patents, and hence can be practiced freely;
          * Is compatible with the file format produced by the current
            widely used gzip utility, in that conforming decompressors
            will be able to read data produced by the existing gzip
            compressor.
 Deutsch                      Informational                      [Page 2]
 RFC 1952             GZIP File Format Specification             May 1996
      The data format defined by this specification does not attempt to:
          * Provide random access to compressed data;
          * Compress specialized data (e.g., raster graphics) as well as
            the best currently available specialized algorithms.
   1.2. Intended audience
      This specification is intended for use by implementors of software
      to compress data into gzip format and/or decompress data from gzip
      format.
      The text of the specification assumes a basic background in
      programming at the level of bits and other primitive data
      representations.
   1.3. Scope
      The specification specifies a compression method and a file format
      (the latter assuming only that a file can store a sequence of
      arbitrary bytes).  It does not specify any particular interface to
      a file system or anything about character sets or encodings
      (except for file names and comments, which are optional).
   1.4. Compliance
      Unless otherwise indicated below, a compliant decompressor must be
      able to accept and decompress any file that conforms to all the
      specifications presented here; a compliant compressor must produce
      files that conform to all the specifications presented here.  The
      material in the appendices is not part of the specification per se
      and is not relevant to compliance.
   1.5. Definitions of terms and conventions used
      byte: 8 bits stored or transmitted as a unit (same as an octet).
      (For this specification, a byte is exactly 8 bits, even on
      machines which store a character on a number of bits different
      from 8.)  See below for the numbering of bits within a byte.
   1.6. Changes from previous versions
      There have been no technical changes to the gzip format since
      version 4.1 of this specification.  In version 4.2, some
      terminology was changed, and the sample CRC code was rewritten for
      clarity and to eliminate the requirement for the caller to do pre-
      and post-conditioning.  Version 4.3 is a conversion of the
      specification to RFC style.
 Deutsch                      Informational                      [Page 3]
 RFC 1952             GZIP File Format Specification             May 1996
 2. Detailed specification
   2.1. Overall conventions
      In the diagrams below, a box like this:
         +---+
         |   | <-- the vertical bars might be missing
         +---+
      represents one byte; a box like this:
         +==============+
         |              |
         +==============+
      represents a variable number of bytes.
      Bytes stored within a computer do not have a "bit order", since
      they are always treated as a unit.  However, a byte considered as
      an integer between 0 and 255 does have a most- and least-
      significant bit, and since we write numbers with the most-
      significant digit on the left, we also write bytes with the most-
      significant bit on the left.  In the diagrams below, we number the
      bits of a byte so that bit 0 is the least-significant bit, i.e.,
      the bits are numbered:
         +--------+
         |76543210|
         +--------+
      This document does not address the issue of the order in which
      bits of a byte are transmitted on a bit-sequential medium, since
      the data format described here is byte- rather than bit-oriented.
      Within a computer, a number may occupy multiple bytes.  All
      multi-byte numbers in the format described here are stored with
      the least-significant byte first (at the lower memory address).
      For example, the decimal number 520 is stored as:
             0        1
         +--------+--------+
         |00001000|00000010|
         +--------+--------+
          ^        ^
          |        |
          |        + more significant byte = 2 x 256
          + less significant byte = 8
 Deutsch                      Informational                      [Page 4]
 RFC 1952             GZIP File Format Specification             May 1996
   2.2. File format
      A gzip file consists of a series of "members" (compressed data
      sets).  The format of each member is specified in the following
      section.  The members simply appear one after another in the file,
      with no additional information before, between, or after them.
   2.3. Member format
      Each member has the following structure:
         +---+---+---+---+---+---+---+---+---+---+
         |ID1|ID2|CM |FLG|     MTIME     |XFL|OS | (more-->)
         +---+---+---+---+---+---+---+---+---+---+
      (if FLG.FEXTRA set)
         +---+---+=================================+
         | XLEN  |...XLEN bytes of "extra field"...| (more-->)
         +---+---+=================================+
      (if FLG.FNAME set)
         +=========================================+
         |...original file name, zero-terminated...| (more-->)
         +=========================================+
      (if FLG.FCOMMENT set)
         +===================================+
         |...file comment, zero-terminated...| (more-->)
         +===================================+
      (if FLG.FHCRC set)
         +---+---+
         | CRC16 |
         +---+---+
         +=======================+
         |...compressed blocks...| (more-->)
         +=======================+
           0   1   2   3   4   5   6   7
         +---+---+---+---+---+---+---+---+
         |     CRC32     |     ISIZE     |
         +---+---+---+---+---+---+---+---+
 Deutsch                      Informational                      [Page 5]
 RFC 1952             GZIP File Format Specification             May 1996
      2.3.1. Member header and trailer
         ID1 (IDentification 1)
         ID2 (IDentification 2)
            These have the fixed values ID1 = 31 (0x1f, \037), ID2 = 139
            (0x8b, \213), to identify the file as being in gzip format.
         CM (Compression Method)
            This identifies the compression method used in the file.  CM
            = 0-7 are reserved.  CM = 8 denotes the "deflate"
            compression method, which is the one customarily used by
            gzip and which is documented elsewhere.
         FLG (FLaGs)
            This flag byte is divided into individual bits as follows:
               bit 0   FTEXT
               bit 1   FHCRC
               bit 2   FEXTRA
               bit 3   FNAME
               bit 4   FCOMMENT
               bit 5   reserved
               bit 6   reserved
               bit 7   reserved
            If FTEXT is set, the file is probably ASCII text.  This is
            an optional indication, which the compressor may set by
            checking a small amount of the input data to see whether any
            non-ASCII characters are present.  In case of doubt, FTEXT
            is cleared, indicating binary data. For systems which have
            different file formats for ascii text and binary data, the
            decompressor can use FTEXT to choose the appropriate format.
            We deliberately do not specify the algorithm used to set
            this bit, since a compressor always has the option of
            leaving it cleared and a decompressor always has the option
            of ignoring it and letting some other program handle issues
            of data conversion.
            If FHCRC is set, a CRC16 for the gzip header is present,
            immediately before the compressed data. The CRC16 consists
            of the two least significant bytes of the CRC32 for all
            bytes of the gzip header up to and not including the CRC16.
            [The FHCRC bit was never set by versions of gzip up to
            1.2.4, even though it was documented with a different
            meaning in gzip 1.2.4.]
            If FEXTRA is set, optional extra fields are present, as
            described in a following section.
 Deutsch                      Informational                      [Page 6]
 RFC 1952             GZIP File Format Specification             May 1996
            If FNAME is set, an original file name is present,
            terminated by a zero byte.  The name must consist of ISO
            8859-1 (LATIN-1) characters; on operating systems using
            EBCDIC or any other character set for file names, the name
            must be translated to the ISO LATIN-1 character set.  This
            is the original name of the file being compressed, with any
            directory components removed, and, if the file being
            compressed is on a file system with case insensitive names,
            forced to lower case. There is no original file name if the
            data was compressed from a source other than a named file;
            for example, if the source was stdin on a Unix system, there
            is no file name.
            If FCOMMENT is set, a zero-terminated file comment is
            present.  This comment is not interpreted; it is only
            intended for human consumption.  The comment must consist of
            ISO 8859-1 (LATIN-1) characters.  Line breaks should be
            denoted by a single line feed character (10 decimal).
            Reserved FLG bits must be zero.
         MTIME (Modification TIME)
            This gives the most recent modification time of the original
            file being compressed.  The time is in Unix format, i.e.,
            seconds since 00:00:00 GMT, Jan.  1, 1970.  (Note that this
            may cause problems for MS-DOS and other systems that use
            local rather than Universal time.)  If the compressed data
            did not come from a file, MTIME is set to the time at which
            compression started.  MTIME = 0 means no time stamp is
            available.
         XFL (eXtra FLags)
            These flags are available for use by specific compression
            methods.  The "deflate" method (CM = 8) sets these flags as
            follows:
               XFL = 2 - compressor used maximum compression,
                         slowest algorithm
               XFL = 4 - compressor used fastest algorithm
         OS (Operating System)
            This identifies the type of file system on which compression
            took place.  This may be useful in determining end-of-line
            convention for text files.  The currently defined values are
            as follows:
 Deutsch                      Informational                      [Page 7]
 RFC 1952             GZIP File Format Specification             May 1996
                 0 - FAT filesystem (MS-DOS, OS/2, NT/Win32)
                 1 - Amiga
                 2 - VMS (or OpenVMS)
                 3 - Unix
                 4 - VM/CMS
                 5 - Atari TOS
                 6 - HPFS filesystem (OS/2, NT)
                 7 - Macintosh
                 8 - Z-System
                 9 - CP/M
                10 - TOPS-20
                11 - NTFS filesystem (NT)
                12 - QDOS
                13 - Acorn RISCOS
               255 - unknown
         XLEN (eXtra LENgth)
            If FLG.FEXTRA is set, this gives the length of the optional
            extra field.  See below for details.
         CRC32 (CRC-32)
            This contains a Cyclic Redundancy Check value of the
            uncompressed data computed according to CRC-32 algorithm
            used in the ISO 3309 standard and in section 8.1.1.6.2 of
            ITU-T recommendation V.42.  (See http://www.iso.ch for
            ordering ISO documents. See gopher://info.itu.ch for an
            online version of ITU-T V.42.)
         ISIZE (Input SIZE)
            This contains the size of the original (uncompressed) input
            data modulo 2^32.
      2.3.1.1. Extra field
         If the FLG.FEXTRA bit is set, an "extra field" is present in
         the header, with total length XLEN bytes.  It consists of a
         series of subfields, each of the form:
            +---+---+---+---+==================================+
            |SI1|SI2|  LEN  |... LEN bytes of subfield data ...|
            +---+---+---+---+==================================+
         SI1 and SI2 provide a subfield ID, typically two ASCII letters
         with some mnemonic value.  Jean-Loup Gailly
         <gzip@prep.ai.mit.edu> is maintaining a registry of subfield
         IDs; please send him any subfield ID you wish to use.  Subfield
         IDs with SI2 = 0 are reserved for future use.  The following
         IDs are currently defined:
 Deutsch                      Informational                      [Page 8]
 RFC 1952             GZIP File Format Specification             May 1996
            SI1         SI2         Data
            ----------  ----------  ----
            0x41 ('A')  0x70 ('P')  Apollo file type information
         LEN gives the length of the subfield data, excluding the 4
         initial bytes.
      2.3.1.2. Compliance
         A compliant compressor must produce files with correct ID1,
         ID2, CM, CRC32, and ISIZE, but may set all the other fields in
         the fixed-length part of the header to default values (255 for
         OS, 0 for all others).  The compressor must set all reserved
         bits to zero.
         A compliant decompressor must check ID1, ID2, and CM, and
         provide an error indication if any of these have incorrect
         values.  It must examine FEXTRA/XLEN, FNAME, FCOMMENT and FHCRC
         at least so it can skip over the optional fields if they are
         present.  It need not examine any other part of the header or
         trailer; in particular, a decompressor may ignore FTEXT and OS
         and always produce binary output, and still be compliant.  A
         compliant decompressor must give an error indication if any
         reserved bit is non-zero, since such a bit could indicate the
         presence of a new field that would cause subsequent data to be
         interpreted incorrectly.
 3. References
   [1] "Information Processing - 8-bit single-byte coded graphic
       character sets - Part 1: Latin alphabet No.1" (ISO 8859-1:1987).
       The ISO 8859-1 (Latin-1) character set is a superset of 7-bit
       ASCII. Files defining this character set are available as
       iso_8859-1.* in ftp://ftp.uu.net/graphics/png/documents/
   [2] ISO 3309
   [3] ITU-T recommendation V.42
   [4] Deutsch, L.P.,"DEFLATE Compressed Data Format Specification",
       available in ftp://ftp.uu.net/pub/archiving/zip/doc/
   [5] Gailly, J.-L., GZIP documentation, available as gzip-*.tar in
       ftp://prep.ai.mit.edu/pub/gnu/
   [6] Sarwate, D.V., "Computation of Cyclic Redundancy Checks via Table
       Look-Up", Communications of the ACM, 31(8), pp.1008-1013.
 Deutsch                      Informational                      [Page 9]
 RFC 1952             GZIP File Format Specification             May 1996
   [7] Schwaderer, W.D., "CRC Calculation", April 85 PC Tech Journal,
       pp.118-133.
   [8] ftp://ftp.adelaide.edu.au/pub/rocksoft/papers/crc_v3.txt,
       describing the CRC concept.
 4. Security Considerations
   Any data compression method involves the reduction of redundancy in
   the data.  Consequently, any corruption of the data is likely to have
   severe effects and be difficult to correct.  Uncompressed text, on
   the other hand, will probably still be readable despite the presence
   of some corrupted bytes.
   It is recommended that systems using this data format provide some
   means of validating the integrity of the compressed data, such as by
   setting and checking the CRC-32 check value.
 5. Acknowledgements
   Trademarks cited in this document are the property of their
   respective owners.
   Jean-Loup Gailly designed the gzip format and wrote, with Mark Adler,
   the related software described in this specification.  Glenn
   Randers-Pehrson converted this document to RFC and HTML format.
 6. Author's Address
   L. Peter Deutsch
   Aladdin Enterprises
   203 Santa Margarita Ave.
   Menlo Park, CA 94025
   Phone: (415) 322-0103 (AM only)
   FAX:   (415) 322-1734
   EMail: <ghost@aladdin.com>
   Questions about the technical content of this specification can be
   sent by email to:
   Jean-Loup Gailly <gzip@prep.ai.mit.edu> and
   Mark Adler <madler@alumni.caltech.edu>
   Editorial comments on this specification can be sent by email to:
   L. Peter Deutsch <ghost@aladdin.com> and
   Glenn Randers-Pehrson <randeg@alumni.rpi.edu>
 Deutsch                      Informational                     [Page 10]
 RFC 1952             GZIP File Format Specification             May 1996
 7. Appendix: Jean-Loup Gailly's gzip utility
   The most widely used implementation of gzip compression, and the
   original documentation on which this specification is based, were
   created by Jean-Loup Gailly <gzip@prep.ai.mit.edu>.  Since this
   implementation is a de facto standard, we mention some more of its
   features here.  Again, the material in this section is not part of
   the specification per se, and implementations need not follow it to
   be compliant.
   When compressing or decompressing a file, gzip preserves the
   protection, ownership, and modification time attributes on the local
   file system, since there is no provision for representing protection
   attributes in the gzip file format itself.  Since the file format
   includes a modification time, the gzip decompressor provides a
   command line switch that assigns the modification time from the file,
   rather than the local modification time of the compressed input, to
   the decompressed output.
 8. Appendix: Sample CRC Code
   The following sample code represents a practical implementation of
   the CRC (Cyclic Redundancy Check). (See also ISO 3309 and ITU-T V.42
   for a formal specification.)
   The sample code is in the ANSI C programming language. Non C users
   may find it easier to read with these hints:
      &      Bitwise AND operator.
      ^      Bitwise exclusive-OR operator.
      >>     Bitwise right shift operator. When applied to an
             unsigned quantity, as here, right shift inserts zero
             bit(s) at the left.
      !      Logical NOT operator.
      ++     "n++" increments the variable n.
      0xNNN  0x introduces a hexadecimal (base 16) constant.
             Suffix L indicates a long value (at least 32 bits).
      /* Table of CRCs of all 8-bit messages. */
      unsigned long crc_table[256];
      /* Flag: has the table been computed? Initially false. */
      int crc_table_computed = 0;
      /* Make the table for a fast CRC. */
      void make_crc_table(void)
      {
        unsigned long c;
 Deutsch                      Informational                     [Page 11]
 RFC 1952             GZIP File Format Specification             May 1996
        int n, k;
        for (n = 0; n < 256; n++) {
          c = (unsigned long) n;
          for (k = 0; k < 8; k++) {
            if (c & 1) {
              c = 0xedb88320L ^ (c >> 1);
            } else {
              c = c >> 1;
            }
          }
          crc_table[n] = c;
        }
        crc_table_computed = 1;
      }
      /*
         Update a running crc with the bytes buf[0..len-1] and return
       the updated crc. The crc should be initialized to zero. Pre- and
       post-conditioning (one's complement) is performed within this
       function so it shouldn't be done by the caller. Usage example:
         unsigned long crc = 0L;
         while (read_buffer(buffer, length) != EOF) {
           crc = update_crc(crc, buffer, length);
         }
         if (crc != original_crc) error();
      */
      unsigned long update_crc(unsigned long crc,
                      unsigned char *buf, int len)
      {
        unsigned long c = crc ^ 0xffffffffL;
        int n;
        if (!crc_table_computed)
          make_crc_table();
        for (n = 0; n < len; n++) {
          c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
        }
        return c ^ 0xffffffffL;
      }
      /* Return the CRC of the bytes buf[0..len-1]. */
      unsigned long crc(unsigned char *buf, int len)
      {
        return update_crc(0L, buf, len);
      }
 Deutsch                      Informational                     [Page 12]
--- a/compat/zlib/doc/txtvsbin.txt
+++ b/compat/zlib/doc/txtvsbin.txt
@@ -1,107 +0,0 @@
 A Fast Method for Identifying Plain Text Files
 ==============================================
 Introduction
 ------------
 Given a file coming from an unknown source, it is sometimes desirable
 to find out whether the format of that file is plain text.  Although
 this may appear like a simple task, a fully accurate detection of the
 file type requires heavy-duty semantic analysis on the file contents.
 It is, however, possible to obtain satisfactory results by employing
 various heuristics.
 Previous versions of PKZip and other zip-compatible compression tools
 were using a crude detection scheme: if more than 80% (4/5) of the bytes
 found in a certain buffer are within the range [7..127], the file is
 labeled as plain text, otherwise it is labeled as binary.  A prominent
 limitation of this scheme is the restriction to Latin-based alphabets.
 Other alphabets, like Greek, Cyrillic or Asian, make extensive use of
 the bytes within the range [128..255], and texts using these alphabets
 are most often misidentified by this scheme; in other words, the rate
 of false negatives is sometimes too high, which means that the recall
 is low.  Another weakness of this scheme is a reduced precision, due to
 the false positives that may occur when binary files containing large
 amounts of textual characters are misidentified as plain text.
 In this article we propose a new, simple detection scheme that features
 a much increased precision and a near-100% recall.  This scheme is
 designed to work on ASCII, Unicode and other ASCII-derived alphabets,
 and it handles single-byte encodings (ISO-8859, MacRoman, KOI8, etc.)
 and variable-sized encodings (ISO-2022, UTF-8, etc.).  Wider encodings
 (UCS-2/UTF-16 and UCS-4/UTF-32) are not handled, however.
 The Algorithm
 -------------
 The algorithm works by dividing the set of bytecodes [0..255] into three
 categories:
 - The white list of textual bytecodes:
  9 (TAB), 10 (LF), 13 (CR), 32 (SPACE) to 255.
 - The gray list of tolerated bytecodes:
  7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB), 27 (ESC).
 - The black list of undesired, non-textual bytecodes:
  0 (NUL) to 6, 14 to 31.
 If a file contains at least one byte that belongs to the white list and
 no byte that belongs to the black list, then the file is categorized as
 plain text; otherwise, it is categorized as binary.  (The boundary case,
 when the file is empty, automatically falls into the latter category.)
 Rationale
 ---------
 The idea behind this algorithm relies on two observations.
 The first observation is that, although the full range of 7-bit codes
 [0..127] is properly specified by the ASCII standard, most control
 characters in the range [0..31] are not used in practice.  The only
 widely-used, almost universally-portable control codes are 9 (TAB),
 10 (LF) and 13 (CR).  There are a few more control codes that are
 recognized on a reduced range of platforms and text viewers/editors:
 7 (BEL), 8 (BS), 11 (VT), 12 (FF), 26 (SUB) and 27 (ESC); but these
 codes are rarely (if ever) used alone, without being accompanied by
 some printable text.  Even the newer, portable text formats such as
 XML avoid using control characters outside the list mentioned here.
 The second observation is that most of the binary files tend to contain
 control characters, especially 0 (NUL).  Even though the older text
 detection schemes observe the presence of non-ASCII codes from the range
 [128..255], the precision rarely has to suffer if this upper range is
 labeled as textual, because the files that are genuinely binary tend to
 contain both control characters and codes from the upper range.  On the
 other hand, the upper range needs to be labeled as textual, because it
 is used by virtually all ASCII extensions.  In particular, this range is
 used for encoding non-Latin scripts.
 Since there is no counting involved, other than simply observing the
 presence or the absence of some byte values, the algorithm produces
 consistent results, regardless what alphabet encoding is being used.
 (If counting were involved, it could be possible to obtain different
 results on a text encoded, say, using ISO-8859-16 versus UTF-8.)
 There is an extra category of plain text files that are "polluted" with
 one or more black-listed codes, either by mistake or by peculiar design
 considerations.  In such cases, a scheme that tolerates a small fraction
 of black-listed codes would provide an increased recall (i.e. more true
 positives).  This, however, incurs a reduced precision overall, since
 false positives are more likely to appear in binary files that contain
 large chunks of textual data.  Furthermore, "polluted" plain text should
 be regarded as binary by general-purpose text detection schemes, because
 general-purpose text processing algorithms might not be applicable.
 Under this premise, it is safe to say that our detection method provides
 a near-100% recall.
 Experiments have been run on many files coming from various platforms
 and applications.  We tried plain text files, system logs, source code,
 formatted office documents, compiled object code, etc.  The results
 confirm the optimistic assumptions about the capabilities of this
 algorithm.
 --
 Cosmin Truta
 Last updated: 2006-May-28
--- a/compat/zlib/examples/gun.c
+++ b/compat/zlib/examples/gun.c
@@ -46,7 +46,7 @@
   end-of-file, they cannot be concantenated.  If a Unix compress stream is
   encountered in an input file, it is the last stream in that file.
-   Like gunzip and uncompress, the file attributes of the orignal compressed
+   Like gunzip and uncompress, the file attributes of the original compressed
   file are maintained in the final uncompressed file, to the extent that the
   user permissions allow it.
--- a/compat/zlib/examples/gzlog.c
+++ b/compat/zlib/examples/gzlog.c
@@ -1,6 +1,6 @@
 /*
 * gzlog.c
- * Copyright (C) 2004, 2008, 2012 Mark Adler, all rights reserved
+ * Copyright (C) 2004, 2008, 2012, 2016 Mark Adler, all rights reserved
 * For conditions of distribution and use, see copyright notice in gzlog.h
 * version 2.2, 14 Aug 2012
 */
@@ -243,7 +243,7 @@ typedef unsigned int uint;
 typedef unsigned long ulong;
 /* Macro for debugging to deterministically force recovery operations */
-#ifdef DEBUG
+#ifdef GZLOG_DEBUG
    #include <setjmp.h>         /* longjmp */
    jmp_buf gzlog_jump;         /* where to go back to */
    int gzlog_bail = 0;         /* which point to bail at (1..8) */
--- a/compat/zlib/examples/zran.c
+++ b/compat/zlib/examples/zran.c
@@ -27,7 +27,7 @@
   grows as needed to accommodate the points.
   To use the index, an offset in the uncompressed data is provided, for which
-   the latest accees point at or preceding that offset is located in the index.
+   the latest access point at or preceding that offset is located in the index.
   The input file is positioned to the specified location in the index, and if
   necessary the first few bits of the compressed data is read from the file.
   inflate is initialized with those bits and the 32K of uncompressed data, and
--- a/compat/zlib/gzguts.h
+++ b/compat/zlib/gzguts.h
@@ -1,5 +1,5 @@
 /* gzguts.h -- zlib internal header definitions for gz* operations
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -25,6 +25,10 @@
 #  include <stdlib.h>
 #  include <limits.h>
 #endif
 #ifndef _POSIX_SOURCE
 #  define _POSIX_SOURCE
 #endif
 #include <fcntl.h>
 #ifdef _WIN32
@@ -35,6 +39,10 @@
 #  include <io.h>
 #endif
 #if defined(_WIN32) || defined(__CYGWIN__)
 #  define WIDECHAR
 #endif
 #ifdef WINAPI_FAMILY
 #  define open _open
 #  define read _read
@@ -95,18 +103,19 @@
 #  endif
 #endif
-/* unlike snprintf (which is required in C99, yet still not supported by
+/* unlike snprintf (which is required in C99), _snprintf does not guarantee
-   Microsoft more than a decade later!), _snprintf does not guarantee null
+   null termination of the result -- however this is only used in gzlib.c where
   termination of the result -- however this is only used in gzlib.c where
   the result is assured to fit in the space provided */
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && _MSC_VER < 1900
 #  define snprintf _snprintf
 #endif
 #ifndef local
 #  define local static
 #endif
-/* compile with -Dlocal if your debugger can't find static symbols */
+/* since "static" is used to mean two completely different things in C, we
   define "local" for the non-static meaning of "static", for readability
   (compile with -Dlocal if your debugger can't find static symbols) */
 /* gz* functions always use library allocation functions */
 #ifndef STDC
@@ -170,7 +179,7 @@ typedef struct {
    char *path;             /* path or fd for error messages */
    unsigned size;          /* buffer size, zero if not allocated yet */
    unsigned want;          /* requested buffer size, default is GZBUFSIZE */
-    unsigned char *in;      /* input buffer */
+    unsigned char *in;      /* input buffer (double-sized when writing) */
    unsigned char *out;     /* output buffer (double-sized when reading) */
    int direct;             /* 0 if processing gzip, 1 if transparent */
        /* just for reading */
--- a/compat/zlib/gzlib.c
+++ b/compat/zlib/gzlib.c
@@ -1,11 +1,11 @@
 /* gzlib.c -- zlib functions common to reading and writing gzip files
- * Copyright (C) 2004, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
 #include "gzguts.h"
-#if defined(_WIN32) && !defined(__BORLANDC__)
+#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
 #  define LSEEK _lseeki64
 #else
 #if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
@@ -94,7 +94,7 @@ local gzFile gz_open(path, fd, mode)
    const char *mode;
 {
    gz_statep state;
-    size_t len;
+    z_size_t len;
    int oflag;
 #ifdef O_CLOEXEC
    int cloexec = 0;
@@ -188,10 +188,10 @@ local gzFile gz_open(path, fd, mode)
    }
    /* save the path name for error messages */
-#ifdef _WIN32
+#ifdef WIDECHAR
    if (fd == -2) {
        len = wcstombs(NULL, path, 0);
-        if (len == (size_t)-1)
+        if (len == (z_size_t)-1)
            len = 0;
    }
    else
@@ -202,7 +202,7 @@ local gzFile gz_open(path, fd, mode)
        free(state);
        return NULL;
    }
-#ifdef _WIN32
+#ifdef WIDECHAR
    if (fd == -2)
        if (len)
            wcstombs(state->path, path, len + 1);
@@ -211,7 +211,7 @@ local gzFile gz_open(path, fd, mode)
    else
 #endif
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-        snprintf(state->path, len + 1, "%s", (const char *)path);
+        (void)snprintf(state->path, len + 1, "%s", (const char *)path);
 #else
        strcpy(state->path, path);
 #endif
@@ -239,7 +239,7 @@ local gzFile gz_open(path, fd, mode)
    /* open the file with the appropriate flags (or just use fd) */
    state->fd = fd > -1 ? fd : (
-#ifdef _WIN32
+#ifdef WIDECHAR
        fd == -2 ? _wopen(path, oflag, 0666) :
 #endif
        open((const char *)path, oflag, 0666));
@@ -248,8 +248,10 @@ local gzFile gz_open(path, fd, mode)
        free(state);
        return NULL;
    }
-    if (state->mode == GZ_APPEND)
+    if (state->mode == GZ_APPEND) {
        LSEEK(state->fd, 0, SEEK_END);  /* so gzoffset() is correct */
        state->mode = GZ_WRITE;         /* simplify later checks */
    }
    /* save the current position for rewinding (only if reading) */
    if (state->mode == GZ_READ) {
@@ -291,7 +293,7 @@ gzFile ZEXPORT gzdopen(fd, mode)
    if (fd == -1 || (path = (char *)malloc(7 + 3 * sizeof(int))) == NULL)
        return NULL;
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd); /* for debugging */
+    (void)snprintf(path, 7 + 3 * sizeof(int), "<fd:%d>", fd);
 #else
    sprintf(path, "<fd:%d>", fd);   /* for debugging */
 #endif
@@ -301,7 +303,7 @@ gzFile ZEXPORT gzdopen(fd, mode)
 }
 /* -- see zlib.h -- */
-#ifdef _WIN32
+#ifdef WIDECHAR
 gzFile ZEXPORT gzopen_w(path, mode)
    const wchar_t *path;
    const char *mode;
@@ -329,6 +331,8 @@ int ZEXPORT gzbuffer(file, size)
        return -1;
    /* check and set requested size */
    if ((size << 1) < size)
        return -1;              /* need to be able to double it */
    if (size < 2)
        size = 2;               /* need two bytes to check magic header */
    state->want = size;
@@ -604,14 +608,13 @@ void ZLIB_INTERNAL gz_error(state, err, msg)
        return;
    }
 #if !defined(NO_snprintf) && !defined(NO_vsnprintf)
-    snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
+    (void)snprintf(state->msg, strlen(state->path) + strlen(msg) + 3,
-             "%s%s%s", state->path, ": ", msg);
+                   "%s%s%s", state->path, ": ", msg);
 #else
    strcpy(state->msg, state->path);
    strcat(state->msg, ": ");
    strcat(state->msg, msg);
 #endif
    return;
 }
 #ifndef INT_MAX
--- a/compat/zlib/gzread.c
+++ b/compat/zlib/gzread.c
@@ -1,5 +1,5 @@
 /* gzread.c -- zlib functions for reading gzip files
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -12,6 +12,7 @@ local int gz_look OF((gz_statep));
 local int gz_decomp OF((gz_statep));
 local int gz_fetch OF((gz_statep));
 local int gz_skip OF((gz_statep, z_off64_t));
 local z_size_t gz_read OF((gz_statep, voidp, z_size_t));
 /* Use read() to load a buffer -- return -1 on error, otherwise 0.  Read from
   state->fd, and update state->eof, state->err, and state->msg as appropriate.
@@ -24,13 +25,17 @@ local int gz_load(state, buf, len, have)
    unsigned *have;
 {
    int ret;
    unsigned get, max = ((unsigned)-1 >> 2) + 1;
    *have = 0;
    do {
-        ret = read(state->fd, buf + *have, len - *have);
+        get = len - *have;
        if (get > max)
            get = max;
        ret = read(state->fd, buf + *have, get);
        if (ret <= 0)
            break;
-        *have += ret;
+        *have += (unsigned)ret;
    } while (*have < len);
    if (ret < 0) {
        gz_error(state, Z_ERRNO, zstrerror());
@@ -94,10 +99,8 @@ local int gz_look(state)
        state->in = (unsigned char *)malloc(state->want);
        state->out = (unsigned char *)malloc(state->want << 1);
        if (state->in == NULL || state->out == NULL) {
-            if (state->out != NULL)
+            free(state->out);
-                free(state->out);
+            free(state->in);
            if (state->in != NULL)
                free(state->in);
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }
@@ -284,33 +287,17 @@ local int gz_skip(state, len)
    return 0;
 }
-/* -- see zlib.h -- */
+/* Read len bytes into buf from file, or less than len up to the end of the
-int ZEXPORT gzread(file, buf, len)
+   input.  Return the number of bytes read.  If zero is returned, either the
-    gzFile file;
+   end of file was reached, or there was an error.  state->err must be
-    voidp buf;
+   consulted in that case to determine which. */
-    unsigned len;
+local z_size_t gz_read(state, buf, len)
 {
    unsigned got, n;
    gz_statep state;
-    z_streamp strm;
+    voidp buf;
-
+    z_size_t len;
-    /* get internal structure */
+{
-    if (file == NULL)
+    z_size_t got;
-        return -1;
+    unsigned n;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return -1;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids the flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return -1;
    }
    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
@@ -320,32 +307,38 @@ int ZEXPORT gzread(file, buf, len)
    if (state->seek) {
        state->seek = 0;
        if (gz_skip(state, state->skip) == -1)
-            return -1;
+            return 0;
    }
    /* get len bytes to buf, or less than len if at the end */
    got = 0;
    do {
        /* set n to the maximum amount of len that fits in an unsigned int */
        n = -1;
        if (n > len)
            n = len;
        /* first just try copying data from the output buffer */
        if (state->x.have) {
-            n = state->x.have > len ? len : state->x.have;
+            if (state->x.have < n)
                n = state->x.have;
            memcpy(buf, state->x.next, n);
            state->x.next += n;
            state->x.have -= n;
        }
        /* output buffer empty -- return if we're at the end of the input */
-        else if (state->eof && strm->avail_in == 0) {
+        else if (state->eof && state->strm.avail_in == 0) {
            state->past = 1;        /* tried to read past end */
            break;
        }
        /* need output data -- for small len or new stream load up our output
           buffer */
-        else if (state->how == LOOK || len < (state->size << 1)) {
+        else if (state->how == LOOK || n < (state->size << 1)) {
            /* get more output, looking for header if required */
            if (gz_fetch(state) == -1)
-                return -1;
+                return 0;
            continue;       /* no progress yet -- go back to copy above */
            /* the copy above assures that we will leave with space in the
               output buffer, allowing at least one gzungetc() to succeed */
@@ -353,16 +346,16 @@ int ZEXPORT gzread(file, buf, len)
        /* large len -- read directly into user buffer */
        else if (state->how == COPY) {      /* read directly */
-            if (gz_load(state, (unsigned char *)buf, len, &n) == -1)
+            if (gz_load(state, (unsigned char *)buf, n, &n) == -1)
-                return -1;
+                return 0;
        }
        /* large len -- decompress directly into user buffer */
        else {  /* state->how == GZIP */
-            strm->avail_out = len;
+            state->strm.avail_out = n;
-            strm->next_out = (unsigned char *)buf;
+            state->strm.next_out = (unsigned char *)buf;
            if (gz_decomp(state) == -1)
-                return -1;
+                return 0;
            n = state->x.have;
            state->x.have = 0;
        }
@@ -374,8 +367,75 @@ int ZEXPORT gzread(file, buf, len)
        state->x.pos += n;
    } while (len);
-    /* return number of bytes read into user buffer (will fit in int) */
+    /* return number of bytes read into user buffer */
-    return (int)got;
+    return got;
 }
 /* -- see zlib.h -- */
 int ZEXPORT gzread(file, buf, len)
    gzFile file;
    voidp buf;
    unsigned len;
 {
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return -1;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in an int");
        return -1;
    }
    /* read len or fewer bytes to buf */
    len = gz_read(state, buf, len);
    /* check for an error */
    if (len == 0 && state->err != Z_OK && state->err != Z_BUF_ERROR)
        return -1;
    /* return the number of bytes read (this is assured to fit in an int) */
    return (int)len;
 }
 /* -- see zlib.h -- */
 z_size_t ZEXPORT gzfread(buf, size, nitems, file)
    voidp buf;
    z_size_t size;
    z_size_t nitems;
    gzFile file;
 {
    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're reading and that there's no (serious) error */
    if (state->mode != GZ_READ ||
            (state->err != Z_OK && state->err != Z_BUF_ERROR))
        return 0;
    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
    }
    /* read len or fewer bytes to buf, return the number of full items read */
    return len ? gz_read(state, buf, len) / size : 0;
 }
 /* -- see zlib.h -- */
@@ -408,8 +468,8 @@ int ZEXPORT gzgetc(file)
        return *(state->x.next)++;
    }
-    /* nothing there -- try gzread() */
+    /* nothing there -- try gz_read() */
-    ret = gzread(file, buf, 1);
+    ret = gz_read(state, buf, 1);
    return ret < 1 ? -1 : buf[0];
 }
@@ -451,7 +511,7 @@ int ZEXPORT gzungetc(c, file)
    if (state->x.have == 0) {
        state->x.have = 1;
        state->x.next = state->out + (state->size << 1) - 1;
-        state->x.next[0] = c;
+        state->x.next[0] = (unsigned char)c;
        state->x.pos--;
        state->past = 0;
        return c;
@@ -473,7 +533,7 @@ int ZEXPORT gzungetc(c, file)
    }
    state->x.have++;
    state->x.next--;
-    state->x.next[0] = c;
+    state->x.next[0] = (unsigned char)c;
    state->x.pos--;
    state->past = 0;
    return c;
--- a/compat/zlib/gzwrite.c
+++ b/compat/zlib/gzwrite.c
@@ -1,5 +1,5 @@
 /* gzwrite.c -- zlib functions for writing gzip files
- * Copyright (C) 2004, 2005, 2010, 2011, 2012, 2013 Mark Adler
+ * Copyright (C) 2004-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -9,17 +9,19 @@
 local int gz_init OF((gz_statep));
 local int gz_comp OF((gz_statep, int));
 local int gz_zero OF((gz_statep, z_off64_t));
 local z_size_t gz_write OF((gz_statep, voidpc, z_size_t));
 /* Initialize state for writing a gzip file.  Mark initialization by setting
-   state->size to non-zero.  Return -1 on failure or 0 on success. */
+   state->size to non-zero.  Return -1 on a memory allocation failure, or 0 on
   success. */
 local int gz_init(state)
    gz_statep state;
 {
    int ret;
    z_streamp strm = &(state->strm);
-    /* allocate input buffer */
+    /* allocate input buffer (double size for gzprintf) */
-    state->in = (unsigned char *)malloc(state->want);
+    state->in = (unsigned char *)malloc(state->want << 1);
    if (state->in == NULL) {
        gz_error(state, Z_MEM_ERROR, "out of memory");
        return -1;
@@ -47,6 +49,7 @@ local int gz_init(state)
            gz_error(state, Z_MEM_ERROR, "out of memory");
            return -1;
        }
        strm->next_in = NULL;
    }
    /* mark state as initialized */
@@ -62,17 +65,17 @@ local int gz_init(state)
 }
 /* Compress whatever is at avail_in and next_in and write to the output file.
-   Return -1 if there is an error writing to the output file, otherwise 0.
+   Return -1 if there is an error writing to the output file or if gz_init()
-   flush is assumed to be a valid deflate() flush value.  If flush is Z_FINISH,
+   fails to allocate memory, otherwise 0.  flush is assumed to be a valid
-   then the deflate() state is reset to start a new gzip stream.  If gz->direct
+   deflate() flush value.  If flush is Z_FINISH, then the deflate() state is
-   is true, then simply write to the output file without compressing, and
+   reset to start a new gzip stream.  If gz->direct is true, then simply write
-   ignore flush. */
+   to the output file without compressing, and ignore flush. */
 local int gz_comp(state, flush)
    gz_statep state;
    int flush;
 {
-    int ret, got;
+    int ret, writ;
-    unsigned have;
+    unsigned have, put, max = ((unsigned)-1 >> 2) + 1;
    z_streamp strm = &(state->strm);
    /* allocate memory if this is the first time through */
@@ -81,12 +84,16 @@ local int gz_comp(state, flush)
    /* write directly if requested */
    if (state->direct) {
-        got = write(state->fd, strm->next_in, strm->avail_in);
+        while (strm->avail_in) {
-        if (got < 0 || (unsigned)got != strm->avail_in) {
+            put = strm->avail_in > max ? max : strm->avail_in;
-            gz_error(state, Z_ERRNO, zstrerror());
+            writ = write(state->fd, strm->next_in, put);
-            return -1;
+            if (writ < 0) {
                gz_error(state, Z_ERRNO, zstrerror());
                return -1;
            }
            strm->avail_in -= (unsigned)writ;
            strm->next_in += writ;
        }
        strm->avail_in = 0;
        return 0;
    }
@@ -97,17 +104,21 @@ local int gz_comp(state, flush)
           doing Z_FINISH then don't write until we get to Z_STREAM_END */
        if (strm->avail_out == 0 || (flush != Z_NO_FLUSH &&
            (flush != Z_FINISH || ret == Z_STREAM_END))) {
-            have = (unsigned)(strm->next_out - state->x.next);
+            while (strm->next_out > state->x.next) {
-            if (have && ((got = write(state->fd, state->x.next, have)) < 0 ||
+                put = strm->next_out - state->x.next > (int)max ? max :
-                         (unsigned)got != have)) {
+                      (unsigned)(strm->next_out - state->x.next);
-                gz_error(state, Z_ERRNO, zstrerror());
+                writ = write(state->fd, state->x.next, put);
-                return -1;
+                if (writ < 0) {
                    gz_error(state, Z_ERRNO, zstrerror());
                    return -1;
                }
                state->x.next += writ;
            }
            if (strm->avail_out == 0) {
                strm->avail_out = state->size;
                strm->next_out = state->out;
                state->x.next = state->out;
            }
            state->x.next = strm->next_out;
        }
        /* compress */
@@ -129,7 +140,8 @@ local int gz_comp(state, flush)
    return 0;
 }
-/* Compress len zeros to output.  Return -1 on error, 0 on success. */
+/* Compress len zeros to output.  Return -1 on a write error or memory
   allocation failure by gz_comp(), or 0 on success. */
 local int gz_zero(state, len)
    gz_statep state;
    z_off64_t len;
@@ -161,32 +173,14 @@ local int gz_zero(state, len)
    return 0;
 }
-/* -- see zlib.h -- */
+/* Write len bytes from buf to file.  Return the number of bytes written.  If
-int ZEXPORT gzwrite(file, buf, len)
+   the returned value is less than len, then there was an error. */
-    gzFile file;
+local z_size_t gz_write(state, buf, len)
    voidpc buf;
    unsigned len;
 {
    unsigned put = len;
    gz_statep state;
-    z_streamp strm;
+    voidpc buf;
-
+    z_size_t len;
-    /* get internal structure */
+{
-    if (file == NULL)
+    z_size_t put = len;
        return 0;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids the flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }
    /* if len is zero, avoid unnecessary operations */
    if (len == 0)
@@ -209,14 +203,15 @@ int ZEXPORT gzwrite(file, buf, len)
        do {
            unsigned have, copy;
-            if (strm->avail_in == 0)
+            if (state->strm.avail_in == 0)
-                strm->next_in = state->in;
+                state->strm.next_in = state->in;
-            have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
+            have = (unsigned)((state->strm.next_in + state->strm.avail_in) -
                              state->in);
            copy = state->size - have;
            if (copy > len)
                copy = len;
            memcpy(state->in + have, buf, copy);
-            strm->avail_in += copy;
+            state->strm.avail_in += copy;
            state->x.pos += copy;
            buf = (const char *)buf + copy;
            len -= copy;
@@ -226,19 +221,83 @@ int ZEXPORT gzwrite(file, buf, len)
    }
    else {
        /* consume whatever's left in the input buffer */
-        if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+        if (state->strm.avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
            return 0;
        /* directly compress user buffer to file */
-        strm->avail_in = len;
+        state->strm.next_in = (z_const Bytef *)buf;
-        strm->next_in = (z_const Bytef *)buf;
+        do {
-        state->x.pos += len;
+            unsigned n = (unsigned)-1;
-        if (gz_comp(state, Z_NO_FLUSH) == -1)
+            if (n > len)
-            return 0;
+                n = len;
            state->strm.avail_in = n;
            state->x.pos += n;
            if (gz_comp(state, Z_NO_FLUSH) == -1)
                return 0;
            len -= n;
        } while (len);
    }
-    /* input was all buffered or compressed (put will fit in int) */
+    /* input was all buffered or compressed */
-    return (int)put;
+    return put;
 }
 /* -- see zlib.h -- */
 int ZEXPORT gzwrite(file, buf, len)
    gzFile file;
    voidpc buf;
    unsigned len;
 {
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* since an int is returned, make sure len fits in one, otherwise return
       with an error (this avoids a flaw in the interface) */
    if ((int)len < 0) {
        gz_error(state, Z_DATA_ERROR, "requested length does not fit in int");
        return 0;
    }
    /* write len bytes from buf (the return value will fit in an int) */
    return (int)gz_write(state, buf, len);
 }
 /* -- see zlib.h -- */
 z_size_t ZEXPORT gzfwrite(buf, size, nitems, file)
    voidpc buf;
    z_size_t size;
    z_size_t nitems;
    gzFile file;
 {
    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return 0;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return 0;
    /* compute bytes to read -- error on overflow */
    len = nitems * size;
    if (size && len / size != nitems) {
        gz_error(state, Z_STREAM_ERROR, "request does not fit in a size_t");
        return 0;
    }
    /* write len bytes to buf, return the number of full items written */
    return len ? gz_write(state, buf, len) / size : 0;
 }
 /* -- see zlib.h -- */
@@ -275,7 +334,7 @@ int ZEXPORT gzputc(file, c)
            strm->next_in = state->in;
        have = (unsigned)((strm->next_in + strm->avail_in) - state->in);
        if (have < state->size) {
-            state->in[have] = c;
+            state->in[have] = (unsigned char)c;
            strm->avail_in++;
            state->x.pos++;
            return c & 0xff;
@@ -283,8 +342,8 @@ int ZEXPORT gzputc(file, c)
    }
    /* no room in buffer or not initialized, use gz_write() */
-    buf[0] = c;
+    buf[0] = (unsigned char)c;
-    if (gzwrite(file, buf, 1) != 1)
+    if (gz_write(state, buf, 1) != 1)
        return -1;
    return c & 0xff;
 }
@@ -295,11 +354,21 @@ int ZEXPORT gzputs(file, str)
    const char *str;
 {
    int ret;
-    unsigned len;
+    z_size_t len;
    gz_statep state;
    /* get internal structure */
    if (file == NULL)
        return -1;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
        return -1;
    /* write string */
-    len = (unsigned)strlen(str);
+    len = strlen(str);
-    ret = gzwrite(file, str, len);
+    ret = gz_write(state, str, len);
    return ret == 0 && len != 0 ? -1 : ret;
 }
@@ -309,63 +378,73 @@ int ZEXPORT gzputs(file, str)
 /* -- see zlib.h -- */
 int ZEXPORTVA gzvprintf(gzFile file, const char *format, va_list va)
 {
-    int size, len;
+    int len;
    unsigned left;
    char *next;
    gz_statep state;
    z_streamp strm;
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
+        return Z_STREAM_ERROR;
    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
-        return 0;
+        return state->err;
    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return 0;
+            return state->err;
    }
-    /* consume whatever's left in the input buffer */
+    /* do the printf() into the input buffer, put length in len -- the input
-    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+       buffer is double-sized just for this function, so there is guaranteed to
-        return 0;
+       be state->size bytes available after the current contents */
-
+    if (strm->avail_in == 0)
-    /* do the printf() into the input buffer, put length in len */
+        strm->next_in = state->in;
-    size = (int)(state->size);
+    next = (char *)(state->in + (strm->next_in - state->in) + strm->avail_in);
-    state->in[size - 1] = 0;
+    next[state->size - 1] = 0;
 #ifdef NO_vsnprintf
 #  ifdef HAS_vsprintf_void
-    (void)vsprintf((char *)(state->in), format, va);
+    (void)vsprintf(next, format, va);
-    for (len = 0; len < size; len++)
+    for (len = 0; len < state->size; len++)
-        if (state->in[len] == 0) break;
+        if (next[len] == 0) break;
 #  else
-    len = vsprintf((char *)(state->in), format, va);
+    len = vsprintf(next, format, va);
 #  endif
 #else
 #  ifdef HAS_vsnprintf_void
-    (void)vsnprintf((char *)(state->in), size, format, va);
+    (void)vsnprintf(next, state->size, format, va);
-    len = strlen((char *)(state->in));
+    len = strlen(next);
 #  else
-    len = vsnprintf((char *)(state->in), size, format, va);
+    len = vsnprintf(next, state->size, format, va);
 #  endif
 #endif
    /* check that printf() results fit in buffer */
-    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
+    if (len == 0 || (unsigned)len >= state->size || next[state->size - 1] != 0)
        return 0;
-    /* update buffer and position, defer compression until needed */
+    /* update buffer and position, compress first half if past that */
-    strm->avail_in = (unsigned)len;
+    strm->avail_in += (unsigned)len;
    strm->next_in = state->in;
    state->x.pos += len;
    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return len;
 }
@@ -390,73 +469,82 @@ int ZEXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
        a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
 {
-    int size, len;
+    unsigned len, left;
    char *next;
    gz_statep state;
    z_streamp strm;
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    strm = &(state->strm);
    /* check that can really pass pointer in ints */
    if (sizeof(int) != sizeof(void *))
-        return 0;
+        return Z_STREAM_ERROR;
    /* check that we're writing and that there's no error */
    if (state->mode != GZ_WRITE || state->err != Z_OK)
-        return 0;
+        return Z_STREAM_ERROR;
    /* make sure we have some buffer space */
    if (state->size == 0 && gz_init(state) == -1)
-        return 0;
+        return state->error;
    /* check for seek request */
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return 0;
+            return state->error;
    }
-    /* consume whatever's left in the input buffer */
+    /* do the printf() into the input buffer, put length in len -- the input
-    if (strm->avail_in && gz_comp(state, Z_NO_FLUSH) == -1)
+       buffer is double-sized just for this function, so there is guaranteed to
-        return 0;
+       be state->size bytes available after the current contents */
-
+    if (strm->avail_in == 0)
-    /* do the printf() into the input buffer, put length in len */
+        strm->next_in = state->in;
-    size = (int)(state->size);
+    next = (char *)(strm->next_in + strm->avail_in);
-    state->in[size - 1] = 0;
+    next[state->size - 1] = 0;
 #ifdef NO_snprintf
 #  ifdef HAS_sprintf_void
-    sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
+    sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12,
-            a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+            a13, a14, a15, a16, a17, a18, a19, a20);
    for (len = 0; len < size; len++)
-        if (state->in[len] == 0) break;
+        if (next[len] == 0)
            break;
 #  else
-    len = sprintf((char *)(state->in), format, a1, a2, a3, a4, a5, a6, a7, a8,
+    len = sprintf(next, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11,
-                  a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+                  a12, a13, a14, a15, a16, a17, a18, a19, a20);
 #  endif
 #else
 #  ifdef HAS_snprintf_void
-    snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6, a7, a8,
+    snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8, a9,
-             a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+             a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
-    len = strlen((char *)(state->in));
+    len = strlen(next);
 #  else
-    len = snprintf((char *)(state->in), size, format, a1, a2, a3, a4, a5, a6,
+    len = snprintf(next, state->size, format, a1, a2, a3, a4, a5, a6, a7, a8,
-                   a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, a17, a18,
+                   a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
                   a19, a20);
 #  endif
 #endif
    /* check that printf() results fit in buffer */
-    if (len <= 0 || len >= (int)size || state->in[size - 1] != 0)
+    if (len == 0 || len >= state->size || next[state->size - 1] != 0)
        return 0;
-    /* update buffer and position, defer compression until needed */
+    /* update buffer and position, compress first half if past that */
-    strm->avail_in = (unsigned)len;
+    strm->avail_in += len;
    strm->next_in = state->in;
    state->x.pos += len;
-    return len;
+    if (strm->avail_in >= state->size) {
        left = strm->avail_in - state->size;
        strm->avail_in = state->size;
        if (gz_comp(state, Z_NO_FLUSH) == -1)
            return state->err;
        memcpy(state->in, state->in + state->size, left);
        strm->next_in = state->in;
        strm->avail_in = left;
    }
    return (int)len;
 }
 #endif
@@ -470,7 +558,7 @@ int ZEXPORT gzflush(file, flush)
    /* get internal structure */
    if (file == NULL)
-        return -1;
+        return Z_STREAM_ERROR;
    state = (gz_statep)file;
    /* check that we're writing and that there's no error */
@@ -485,11 +573,11 @@ int ZEXPORT gzflush(file, flush)
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return -1;
+            return state->err;
    }
    /* compress remaining data with requested flush */
-    gz_comp(state, flush);
+    (void)gz_comp(state, flush);
    return state->err;
 }
@@ -520,13 +608,13 @@ int ZEXPORT gzsetparams(file, level, strategy)
    if (state->seek) {
        state->seek = 0;
        if (gz_zero(state, state->skip) == -1)
-            return -1;
+            return state->err;
    }
    /* change compression parameters for subsequent input */
    if (state->size) {
        /* flush previous input with previous parameters before changing */
-        if (strm->avail_in && gz_comp(state, Z_PARTIAL_FLUSH) == -1)
+        if (strm->avail_in && gz_comp(state, Z_BLOCK) == -1)
            return state->err;
        deflateParams(strm, level, strategy);
    }
--- a/compat/zlib/infback.c
+++ b/compat/zlib/infback.c
@@ -1,5 +1,5 @@
 /* infback.c -- inflate using a call-back interface
- * Copyright (C) 1995-2011 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -61,7 +61,7 @@ int stream_size;
    Tracev((stderr, "inflate: allocated\n"));
    strm->state = (struct internal_state FAR *)state;
    state->dmax = 32768U;
-    state->wbits = windowBits;
+    state->wbits = (uInt)windowBits;
    state->wsize = 1U << windowBits;
    state->window = window;
    state->wnext = 0;
--- a/compat/zlib/inffast.c
+++ b/compat/zlib/inffast.c
@@ -1,5 +1,5 @@
 /* inffast.c -- fast decoding
- * Copyright (C) 1995-2008, 2010, 2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -8,26 +8,9 @@
 #include "inflate.h"
 #include "inffast.h"
-#ifndef ASMINF
+#ifdef ASMINF
-
+#  pragma message("Assembler code may have bugs -- use at your own risk")
 /* Allow machine dependent optimization for post-increment or pre-increment.
   Based on testing to date,
   Pre-increment preferred for:
   - PowerPC G3 (Adler)
   - MIPS R5000 (Randers-Pehrson)
   Post-increment preferred for:
   - none
   No measurable difference:
   - Pentium III (Anderson)
   - M68060 (Nikl)
 */
 #ifdef POSTINC
 #  define OFF 0
 #  define PUP(a) *(a)++
 #else
 #  define OFF 1
 #  define PUP(a) *++(a)
 #endif
 /*
   Decode literal, length, and distance codes and write out the resulting
@@ -96,9 +79,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
    /* copy state to local variables */
    state = (struct inflate_state FAR *)strm->state;
-    in = strm->next_in - OFF;
+    in = strm->next_in;
    last = in + (strm->avail_in - 5);
-    out = strm->next_out - OFF;
+    out = strm->next_out;
    beg = out - (start - strm->avail_out);
    end = out + (strm->avail_out - 257);
 #ifdef INFLATE_STRICT
@@ -119,9 +102,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
       input data or output space */
    do {
        if (bits < 15) {
-            hold += (unsigned long)(PUP(in)) << bits;
+            hold += (unsigned long)(*in++) << bits;
            bits += 8;
-            hold += (unsigned long)(PUP(in)) << bits;
+            hold += (unsigned long)(*in++) << bits;
            bits += 8;
        }
        here = lcode[hold & lmask];
@@ -134,14 +117,14 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
            Tracevv((stderr, here.val >= 0x20 && here.val < 0x7f ?
                    "inflate:         literal '%c'\n" :
                    "inflate:         literal 0x%02x\n", here.val));
-            PUP(out) = (unsigned char)(here.val);
+            *out++ = (unsigned char)(here.val);
        }
        else if (op & 16) {                     /* length base */
            len = (unsigned)(here.val);
            op &= 15;                           /* number of extra bits */
            if (op) {
                if (bits < op) {
-                    hold += (unsigned long)(PUP(in)) << bits;
+                    hold += (unsigned long)(*in++) << bits;
                    bits += 8;
                }
                len += (unsigned)hold & ((1U << op) - 1);
@@ -150,9 +133,9 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
            }
            Tracevv((stderr, "inflate:         length %u\n", len));
            if (bits < 15) {
-                hold += (unsigned long)(PUP(in)) << bits;
+                hold += (unsigned long)(*in++) << bits;
                bits += 8;
-                hold += (unsigned long)(PUP(in)) << bits;
+                hold += (unsigned long)(*in++) << bits;
                bits += 8;
            }
            here = dcode[hold & dmask];
@@ -165,10 +148,10 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                dist = (unsigned)(here.val);
                op &= 15;                       /* number of extra bits */
                if (bits < op) {
-                    hold += (unsigned long)(PUP(in)) << bits;
+                    hold += (unsigned long)(*in++) << bits;
                    bits += 8;
                    if (bits < op) {
-                        hold += (unsigned long)(PUP(in)) << bits;
+                        hold += (unsigned long)(*in++) << bits;
                        bits += 8;
                    }
                }
@@ -196,30 +179,30 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
                        if (len <= op - whave) {
                            do {
-                                PUP(out) = 0;
+                                *out++ = 0;
                            } while (--len);
                            continue;
                        }
                        len -= op - whave;
                        do {
-                            PUP(out) = 0;
+                            *out++ = 0;
                        } while (--op > whave);
                        if (op == 0) {
                            from = out - dist;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--len);
                            continue;
                        }
 #endif
                    }
-                    from = window - OFF;
+                    from = window;
                    if (wnext == 0) {           /* very common case */
                        from += wsize - op;
                        if (op < len) {         /* some from window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
                            from = out - dist;  /* rest from output */
                        }
@@ -230,14 +213,14 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                        if (op < len) {         /* some from end of window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
-                            from = window - OFF;
+                            from = window;
                            if (wnext < len) {  /* some from start of window */
                                op = wnext;
                                len -= op;
                                do {
-                                    PUP(out) = PUP(from);
+                                    *out++ = *from++;
                                } while (--op);
                                from = out - dist;      /* rest from output */
                            }
@@ -248,35 +231,35 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
                        if (op < len) {         /* some from window */
                            len -= op;
                            do {
-                                PUP(out) = PUP(from);
+                                *out++ = *from++;
                            } while (--op);
                            from = out - dist;  /* rest from output */
                        }
                    }
                    while (len > 2) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        len -= 3;
                    }
                    if (len) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        if (len > 1)
-                            PUP(out) = PUP(from);
+                            *out++ = *from++;
                    }
                }
                else {
                    from = out - dist;          /* copy direct from output */
                    do {                        /* minimum length is three */
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        len -= 3;
                    } while (len > 2);
                    if (len) {
-                        PUP(out) = PUP(from);
+                        *out++ = *from++;
                        if (len > 1)
-                            PUP(out) = PUP(from);
+                            *out++ = *from++;
                    }
                }
            }
@@ -313,8 +296,8 @@ unsigned start;         /* inflate()'s starting value for strm->avail_out */
    hold &= (1U << bits) - 1;
    /* update state and return */
-    strm->next_in = in + OFF;
+    strm->next_in = in;
-    strm->next_out = out + OFF;
+    strm->next_out = out;
    strm->avail_in = (unsigned)(in < last ? 5 + (last - in) : 5 - (in - last));
    strm->avail_out = (unsigned)(out < end ?
                                 257 + (end - out) : 257 - (out - end));
--- a/compat/zlib/inflate.c
+++ b/compat/zlib/inflate.c
@@ -1,5 +1,5 @@
 /* inflate.c -- zlib decompression
- * Copyright (C) 1995-2012 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -92,6 +92,7 @@
 #endif
 /* function prototypes */
 local int inflateStateCheck OF((z_streamp strm));
 local void fixedtables OF((struct inflate_state FAR *state));
 local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
                           unsigned copy));
@@ -101,12 +102,26 @@ local int updatewindow OF((z_streamp strm, const unsigned char FAR *end,
 local unsigned syncsearch OF((unsigned FAR *have, const unsigned char FAR *buf,
                              unsigned len));
 local int inflateStateCheck(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
    if (strm == Z_NULL ||
        strm->zalloc == (alloc_func)0 || strm->zfree == (free_func)0)
        return 1;
    state = (struct inflate_state FAR *)strm->state;
    if (state == Z_NULL || state->strm != strm ||
        state->mode < HEAD || state->mode > SYNC)
        return 1;
    return 0;
 }
 int ZEXPORT inflateResetKeep(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    strm->total_in = strm->total_out = state->total = 0;
    strm->msg = Z_NULL;
@@ -131,7 +146,7 @@ z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    state->wsize = 0;
    state->whave = 0;
@@ -147,7 +162,7 @@ int windowBits;
    struct inflate_state FAR *state;
    /* get the state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    /* extract wrap request from windowBits parameter */
@@ -156,7 +171,7 @@ int windowBits;
        windowBits = -windowBits;
    }
    else {
-        wrap = (windowBits >> 4) + 1;
+        wrap = (windowBits >> 4) + 5;
 #ifdef GUNZIP
        if (windowBits < 48)
            windowBits &= 15;
@@ -210,7 +225,9 @@ int stream_size;
    if (state == Z_NULL) return Z_MEM_ERROR;
    Tracev((stderr, "inflate: allocated\n"));
    strm->state = (struct internal_state FAR *)state;
    state->strm = strm;
    state->window = Z_NULL;
    state->mode = HEAD;     /* to pass state test in inflateReset2() */
    ret = inflateReset2(strm, windowBits);
    if (ret != Z_OK) {
        ZFREE(strm, state);
@@ -234,17 +251,17 @@ int value;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (bits < 0) {
        state->hold = 0;
        state->bits = 0;
        return Z_OK;
    }
-    if (bits > 16 || state->bits + bits > 32) return Z_STREAM_ERROR;
+    if (bits > 16 || state->bits + (uInt)bits > 32) return Z_STREAM_ERROR;
    value &= (1L << bits) - 1;
-    state->hold += value << state->bits;
+    state->hold += (unsigned)value << state->bits;
-    state->bits += bits;
+    state->bits += (uInt)bits;
    return Z_OK;
 }
@@ -625,7 +642,7 @@ int flush;
    static const unsigned short order[19] = /* permutation of code lengths */
        {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->next_out == Z_NULL ||
+    if (inflateStateCheck(strm) || strm->next_out == Z_NULL ||
        (strm->next_in == Z_NULL && strm->avail_in != 0))
        return Z_STREAM_ERROR;
@@ -645,6 +662,8 @@ int flush;
            NEEDBITS(16);
 #ifdef GUNZIP
            if ((state->wrap & 2) && hold == 0x8b1f) {  /* gzip header */
                if (state->wbits == 0)
                    state->wbits = 15;
                state->check = crc32(0L, Z_NULL, 0);
                CRC2(state->check, hold);
                INITBITS();
@@ -672,7 +691,7 @@ int flush;
            len = BITS(4) + 8;
            if (state->wbits == 0)
                state->wbits = len;
-            else if (len > state->wbits) {
+            if (len > 15 || len > state->wbits) {
                strm->msg = (char *)"invalid window size";
                state->mode = BAD;
                break;
@@ -699,14 +718,16 @@ int flush;
            }
            if (state->head != Z_NULL)
                state->head->text = (int)((hold >> 8) & 1);
-            if (state->flags & 0x0200) CRC2(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC2(state->check, hold);
            INITBITS();
            state->mode = TIME;
        case TIME:
            NEEDBITS(32);
            if (state->head != Z_NULL)
                state->head->time = hold;
-            if (state->flags & 0x0200) CRC4(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC4(state->check, hold);
            INITBITS();
            state->mode = OS;
        case OS:
@@ -715,7 +736,8 @@ int flush;
                state->head->xflags = (int)(hold & 0xff);
                state->head->os = (int)(hold >> 8);
            }
-            if (state->flags & 0x0200) CRC2(state->check, hold);
+            if ((state->flags & 0x0200) && (state->wrap & 4))
                CRC2(state->check, hold);
            INITBITS();
            state->mode = EXLEN;
        case EXLEN:
@@ -724,7 +746,8 @@ int flush;
                state->length = (unsigned)(hold);
                if (state->head != Z_NULL)
                    state->head->extra_len = (unsigned)hold;
-                if (state->flags & 0x0200) CRC2(state->check, hold);
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    CRC2(state->check, hold);
                INITBITS();
            }
            else if (state->head != Z_NULL)
@@ -742,7 +765,7 @@ int flush;
                                len + copy > state->head->extra_max ?
                                state->head->extra_max - len : copy);
                    }
-                    if (state->flags & 0x0200)
+                    if ((state->flags & 0x0200) && (state->wrap & 4))
                        state->check = crc32(state->check, next, copy);
                    have -= copy;
                    next += copy;
@@ -761,9 +784,9 @@ int flush;
                    if (state->head != Z_NULL &&
                            state->head->name != Z_NULL &&
                            state->length < state->head->name_max)
-                        state->head->name[state->length++] = len;
+                        state->head->name[state->length++] = (Bytef)len;
                } while (len && copy < have);
-                if (state->flags & 0x0200)
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    state->check = crc32(state->check, next, copy);
                have -= copy;
                next += copy;
@@ -782,9 +805,9 @@ int flush;
                    if (state->head != Z_NULL &&
                            state->head->comment != Z_NULL &&
                            state->length < state->head->comm_max)
-                        state->head->comment[state->length++] = len;
+                        state->head->comment[state->length++] = (Bytef)len;
                } while (len && copy < have);
-                if (state->flags & 0x0200)
+                if ((state->flags & 0x0200) && (state->wrap & 4))
                    state->check = crc32(state->check, next, copy);
                have -= copy;
                next += copy;
@@ -796,7 +819,7 @@ int flush;
        case HCRC:
            if (state->flags & 0x0200) {
                NEEDBITS(16);
-                if (hold != (state->check & 0xffff)) {
+                if ((state->wrap & 4) && hold != (state->check & 0xffff)) {
                    strm->msg = (char *)"header crc mismatch";
                    state->mode = BAD;
                    break;
@@ -1177,11 +1200,11 @@ int flush;
                out -= left;
                strm->total_out += out;
                state->total += out;
-                if (out)
+                if ((state->wrap & 4) && out)
                    strm->adler = state->check =
                        UPDATE(state->check, put - out, out);
                out = left;
-                if ((
+                if ((state->wrap & 4) && (
 #ifdef GUNZIP
                     state->flags ? hold :
 #endif
@@ -1240,10 +1263,10 @@ int flush;
    strm->total_in += in;
    strm->total_out += out;
    state->total += out;
-    if (state->wrap && out)
+    if ((state->wrap & 4) && out)
        strm->adler = state->check =
            UPDATE(state->check, strm->next_out - out, out);
-    strm->data_type = state->bits + (state->last ? 64 : 0) +
+    strm->data_type = (int)state->bits + (state->last ? 64 : 0) +
                      (state->mode == TYPE ? 128 : 0) +
                      (state->mode == LEN_ || state->mode == COPY_ ? 256 : 0);
    if (((in == 0 && out == 0) || flush == Z_FINISH) && ret == Z_OK)
@@ -1255,7 +1278,7 @@ int ZEXPORT inflateEnd(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL || strm->zfree == (free_func)0)
+    if (inflateStateCheck(strm))
        return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (state->window != Z_NULL) ZFREE(strm, state->window);
@@ -1273,7 +1296,7 @@ uInt *dictLength;
    struct inflate_state FAR *state;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    /* copy dictionary */
@@ -1298,7 +1321,7 @@ uInt dictLength;
    int ret;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (state->wrap != 0 && state->mode != DICT)
        return Z_STREAM_ERROR;
@@ -1330,7 +1353,7 @@ gz_headerp head;
    struct inflate_state FAR *state;
    /* check state */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if ((state->wrap & 2) == 0) return Z_STREAM_ERROR;
@@ -1383,7 +1406,7 @@ z_streamp strm;
    struct inflate_state FAR *state;
    /* check parameters */
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (strm->avail_in == 0 && state->bits < 8) return Z_BUF_ERROR;
@@ -1430,7 +1453,7 @@ z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    return state->mode == STORED && state->bits == 0;
 }
@@ -1445,8 +1468,7 @@ z_streamp source;
    unsigned wsize;
    /* check input */
-    if (dest == Z_NULL || source == Z_NULL || source->state == Z_NULL ||
+    if (inflateStateCheck(source) || dest == Z_NULL)
        source->zalloc == (alloc_func)0 || source->zfree == (free_func)0)
        return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)source->state;
@@ -1467,6 +1489,7 @@ z_streamp source;
    /* copy state */
    zmemcpy((voidpf)dest, (voidpf)source, sizeof(z_stream));
    zmemcpy((voidpf)copy, (voidpf)state, sizeof(struct inflate_state));
    copy->strm = dest;
    if (state->lencode >= state->codes &&
        state->lencode <= state->codes + ENOUGH - 1) {
        copy->lencode = copy->codes + (state->lencode - state->codes);
@@ -1488,25 +1511,51 @@ int subvert;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    state->sane = !subvert;
 #ifdef INFLATE_ALLOW_INVALID_DISTANCE_TOOFAR_ARRR
    state->sane = !subvert;
    return Z_OK;
 #else
    (void)subvert;
    state->sane = 1;
    return Z_DATA_ERROR;
 #endif
 }
 int ZEXPORT inflateValidate(strm, check)
 z_streamp strm;
 int check;
 {
    struct inflate_state FAR *state;
    if (inflateStateCheck(strm)) return Z_STREAM_ERROR;
    state = (struct inflate_state FAR *)strm->state;
    if (check)
        state->wrap |= 4;
    else
        state->wrap &= ~4;
    return Z_OK;
 }
 long ZEXPORT inflateMark(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
-    if (strm == Z_NULL || strm->state == Z_NULL) return -1L << 16;
+    if (inflateStateCheck(strm))
        return -(1L << 16);
    state = (struct inflate_state FAR *)strm->state;
-    return ((long)(state->back) << 16) +
+    return (long)(((unsigned long)((long)state->back)) << 16) +
        (state->mode == COPY ? state->length :
            (state->mode == MATCH ? state->was - state->length : 0));
 }
 unsigned long ZEXPORT inflateCodesUsed(strm)
 z_streamp strm;
 {
    struct inflate_state FAR *state;
    if (inflateStateCheck(strm)) return (unsigned long)-1;
    state = (struct inflate_state FAR *)strm->state;
    return (unsigned long)(state->next - state->codes);
 }
--- a/compat/zlib/inflate.h
+++ b/compat/zlib/inflate.h
@@ -1,5 +1,5 @@
 /* inflate.h -- internal inflate state definition
- * Copyright (C) 1995-2009 Mark Adler
+ * Copyright (C) 1995-2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -18,7 +18,7 @@
 /* Possible inflate modes between inflate() calls */
 typedef enum {
-    HEAD,       /* i: waiting for magic header */
+    HEAD = 16180,   /* i: waiting for magic header */
    FLAGS,      /* i: waiting for method and flags (gzip) */
    TIME,       /* i: waiting for modification time (gzip) */
    OS,         /* i: waiting for extra flags and operating system (gzip) */
@@ -77,11 +77,14 @@ typedef enum {
        CHECK -> LENGTH -> DONE
 */
-/* state maintained between inflate() calls.  Approximately 10K bytes. */
+/* State maintained between inflate() calls -- approximately 7K bytes, not
   including the allocated sliding window, which is up to 32K bytes. */
 struct inflate_state {
    z_streamp strm;             /* pointer back to this zlib stream */
    inflate_mode mode;          /* current inflate mode */
    int last;                   /* true if processing last block */
-    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip */
+    int wrap;                   /* bit 0 true for zlib, bit 1 true for gzip,
                                   bit 2 true to validate check value */
    int havedict;               /* true if dictionary provided */
    int flags;                  /* gzip header method and flags (0 if zlib) */
    unsigned dmax;              /* zlib header max distance (INFLATE_STRICT) */
--- a/compat/zlib/inftrees.c
+++ b/compat/zlib/inftrees.c
@@ -1,5 +1,5 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-2013 Mark Adler
+ * Copyright (C) 1995-2017 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -9,7 +9,7 @@
 #define MAXBITS 15
 const char inflate_copyright[] =
-   " inflate 1.2.8 Copyright 1995-2013 Mark Adler ";
+   " inflate 1.2.11 Copyright 1995-2017 Mark Adler ";
 /*
  If you use the zlib library in a product, an acknowledgment is welcome
  in the documentation of your product. If for some reason you cannot
@@ -54,7 +54,7 @@ unsigned short FAR *work;
    code FAR *next;             /* next available space in table */
    const unsigned short FAR *base;     /* base value table to use */
    const unsigned short FAR *extra;    /* extra bits table to use */
-    int end;                    /* use base and extra for symbol > end */
+    unsigned match;             /* use base and extra for symbol >= match */
    unsigned short count[MAXBITS+1];    /* number of codes of each length */
    unsigned short offs[MAXBITS+1];     /* offsets in table for each length */
    static const unsigned short lbase[31] = { /* Length codes 257..285 base */
@@ -62,7 +62,7 @@ unsigned short FAR *work;
        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
    static const unsigned short lext[31] = { /* Length codes 257..285 extra */
        16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18,
-        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 72, 78};
+        19, 19, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 16, 77, 202};
    static const unsigned short dbase[32] = { /* Distance codes 0..29 base */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
@@ -181,19 +181,17 @@ unsigned short FAR *work;
    switch (type) {
    case CODES:
        base = extra = work;    /* dummy value--not used */
-        end = 19;
+        match = 20;
        break;
    case LENS:
        base = lbase;
        base -= 257;
        extra = lext;
-        extra -= 257;
+        match = 257;
        end = 256;
        break;
-    default:            /* DISTS */
+    default:    /* DISTS */
        base = dbase;
        extra = dext;
-        end = -1;
+        match = 0;
    }
    /* initialize state for loop */
@@ -216,13 +214,13 @@ unsigned short FAR *work;
    for (;;) {
        /* create table entry */
        here.bits = (unsigned char)(len - drop);
-        if ((int)(work[sym]) < end) {
+        if (work[sym] + 1U < match) {
            here.op = (unsigned char)0;
            here.val = work[sym];
        }
-        else if ((int)(work[sym]) > end) {
+        else if (work[sym] >= match) {
-            here.op = (unsigned char)(extra[work[sym]]);
+            here.op = (unsigned char)(extra[work[sym] - match]);
-            here.val = base[work[sym]];
+            here.val = base[work[sym] - match];
        }
        else {
            here.op = (unsigned char)(32 + 64);         /* end of block */
--- a/compat/zlib/msdos/Makefile.dj2
+++ b/compat/zlib/msdos/Makefile.dj2
@@ -29,7 +29,7 @@ CC=gcc
 #CFLAGS=-MMD -O
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DDEBUG
+#CFLAGS=-MMD -g -DZLIB_DEBUG
 CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
             -Wstrict-prototypes -Wmissing-prototypes
--- a/compat/zlib/msdos/Makefile.emx
+++ b/compat/zlib/msdos/Makefile.emx
@@ -11,7 +11,7 @@ CC=gcc
 #CFLAGS=-MMD -O
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DDEBUG
+#CFLAGS=-MMD -g -DZLIB_DEBUG
 CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
             -Wstrict-prototypes -Wmissing-prototypes
--- a/compat/zlib/old/Makefile.emx
+++ b/compat/zlib/old/Makefile.emx
@@ -11,7 +11,7 @@ CC=gcc -Zwin32
 #CFLAGS=-MMD -O
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DDEBUG
+#CFLAGS=-MMD -g -DZLIB_DEBUG
 CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
             -Wstrict-prototypes -Wmissing-prototypes
--- a/compat/zlib/old/os2/Makefile.os2
+++ b/compat/zlib/old/os2/Makefile.os2
@@ -14,7 +14,7 @@ CC=gcc -Zomf -s
 CFLAGS=-O6 -Wall
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DDEBUG
+#CFLAGS=-g -DZLIB_DEBUG
 #CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
 #           -Wstrict-prototypes -Wmissing-prototypes
--- a/compat/zlib/os400/README400
+++ b/compat/zlib/os400/README400
@@ -0,0 +1,48 @@
        ZLIB version 1.2.11 for OS/400 installation instructions
 1) Download and unpack the zlib tarball to some IFS directory.
   (i.e.: /path/to/the/zlib/ifs/source/directory)
   If the installed IFS command suppors gzip format, this is straightforward,
 else you have to unpack first to some directory on a system supporting it,
 then move the whole directory to the IFS via the network (via SMB or FTP).
 2) Edit the configuration parameters in the compilation script.
        EDTF STMF('/path/to/the/zlib/ifs/source/directory/os400/make.sh')
 Tune the parameters according to your needs if not matching the defaults.
 Save the file and exit after edition.
 3) Enter qshell, then work in the zlib OS/400 specific directory.
        QSH
        cd /path/to/the/zlib/ifs/source/directory/os400
 4) Compile and install
        sh make.sh
 The script will:
 - create the libraries, objects and IFS directories for the zlib environment,
 - compile all modules,
 - create a service program,
 - create a static and a dynamic binding directory,
 - install header files for C/C++ and for ILE/RPG, both for compilation in
  DB2 and IFS environments.
 That's all. 
 Notes:  For OS/400 ILE RPG programmers, a /copy member defining the ZLIB
                API prototypes for ILE RPG can be found in ZLIB/H(ZLIB.INC).
                In the ILE environment, the same definitions are available from
                file zlib.inc located in the same IFS include directory as the
                C/C++ header files.
                Please read comments in this member for more information.
        Remember that most foreign textual data are ASCII coded: this
                implementation does not handle conversion from/to ASCII, so
                text data code conversions must be done explicitely.
        Mainly for the reason above, always open zipped files in binary mode.
--- a/compat/zlib/os400/bndsrc
+++ b/compat/zlib/os400/bndsrc
@@ -0,0 +1,119 @@
 STRPGMEXP PGMLVL(*CURRENT) SIGNATURE('ZLIB')
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.1.3 entry points.                                    */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("adler32")
  EXPORT SYMBOL("compress")
  EXPORT SYMBOL("compress2")
  EXPORT SYMBOL("crc32")
  EXPORT SYMBOL("get_crc_table")
  EXPORT SYMBOL("deflate")
  EXPORT SYMBOL("deflateEnd")
  EXPORT SYMBOL("deflateSetDictionary")
  EXPORT SYMBOL("deflateCopy")
  EXPORT SYMBOL("deflateReset")
  EXPORT SYMBOL("deflateParams")
  EXPORT SYMBOL("deflatePrime")
  EXPORT SYMBOL("deflateInit_")
  EXPORT SYMBOL("deflateInit2_")
  EXPORT SYMBOL("gzopen")
  EXPORT SYMBOL("gzdopen")
  EXPORT SYMBOL("gzsetparams")
  EXPORT SYMBOL("gzread")
  EXPORT SYMBOL("gzwrite")
  EXPORT SYMBOL("gzprintf")
  EXPORT SYMBOL("gzputs")
  EXPORT SYMBOL("gzgets")
  EXPORT SYMBOL("gzputc")
  EXPORT SYMBOL("gzgetc")
  EXPORT SYMBOL("gzflush")
  EXPORT SYMBOL("gzseek")
  EXPORT SYMBOL("gzrewind")
  EXPORT SYMBOL("gztell")
  EXPORT SYMBOL("gzeof")
  EXPORT SYMBOL("gzclose")
  EXPORT SYMBOL("gzerror")
  EXPORT SYMBOL("inflate")
  EXPORT SYMBOL("inflateEnd")
  EXPORT SYMBOL("inflateSetDictionary")
  EXPORT SYMBOL("inflateSync")
  EXPORT SYMBOL("inflateReset")
  EXPORT SYMBOL("inflateInit_")
  EXPORT SYMBOL("inflateInit2_")
  EXPORT SYMBOL("inflateSyncPoint")
  EXPORT SYMBOL("uncompress")
  EXPORT SYMBOL("zlibVersion")
  EXPORT SYMBOL("zError")
  EXPORT SYMBOL("z_errmsg")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.1 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("compressBound")
  EXPORT SYMBOL("deflateBound")
  EXPORT SYMBOL("deflatePending")
  EXPORT SYMBOL("gzungetc")
  EXPORT SYMBOL("gzclearerr")
  EXPORT SYMBOL("inflateBack")
  EXPORT SYMBOL("inflateBackEnd")
  EXPORT SYMBOL("inflateBackInit_")
  EXPORT SYMBOL("inflateCopy")
  EXPORT SYMBOL("zlibCompileFlags")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.4 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("adler32_combine")
  EXPORT SYMBOL("adler32_combine64")
  EXPORT SYMBOL("crc32_combine")
  EXPORT SYMBOL("crc32_combine64")
  EXPORT SYMBOL("deflateSetHeader")
  EXPORT SYMBOL("deflateTune")
  EXPORT SYMBOL("gzbuffer")
  EXPORT SYMBOL("gzclose_r")
  EXPORT SYMBOL("gzclose_w")
  EXPORT SYMBOL("gzdirect")
  EXPORT SYMBOL("gzoffset")
  EXPORT SYMBOL("gzoffset64")
  EXPORT SYMBOL("gzopen64")
  EXPORT SYMBOL("gzseek64")
  EXPORT SYMBOL("gztell64")
  EXPORT SYMBOL("inflateGetHeader")
  EXPORT SYMBOL("inflateMark")
  EXPORT SYMBOL("inflatePrime")
  EXPORT SYMBOL("inflateReset2")
  EXPORT SYMBOL("inflateUndermine")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.6 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("deflateResetKeep")
  EXPORT SYMBOL("gzgetc_")
  EXPORT SYMBOL("inflateResetKeep")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.8 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("gzvprintf")
  EXPORT SYMBOL("inflateGetDictionary")
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
 /*   Version 1.2.9 additional entry points.                         */
 /*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@*/
  EXPORT SYMBOL("adler32_z")
  EXPORT SYMBOL("crc32_z")
  EXPORT SYMBOL("deflateGetDictionary")
  EXPORT SYMBOL("gzfread")
  EXPORT SYMBOL("gzfwrite")
  EXPORT SYMBOL("inflateCodesUsed")
  EXPORT SYMBOL("inflateValidate")
  EXPORT SYMBOL("uncompress2")
 ENDPGMEXP
--- a/compat/zlib/os400/make.sh
+++ b/compat/zlib/os400/make.sh
@@ -0,0 +1,366 @@
 #!/bin/sh
 #
 #       ZLIB compilation script for the OS/400.
 #
 #
 #       This is a shell script since make is not a standard component of OS/400.
 ################################################################################
 #
 #                       Tunable configuration parameters.
 #
 ################################################################################
 TARGETLIB='ZLIB'                # Target OS/400 program library
 STATBNDDIR='ZLIB_A'             # Static binding directory.
 DYNBNDDIR='ZLIB'                # Dynamic binding directory.
 SRVPGM="ZLIB"                   # Service program.
 IFSDIR='/zlib'                  # IFS support base directory.
 TGTCCSID='500'                  # Target CCSID of objects
 DEBUG='*NONE'                   # Debug level
 OPTIMIZE='40'                   # Optimisation level
 OUTPUT='*NONE'                  # Compilation output option.
 TGTRLS='V6R1M0'                 # Target OS release
 export TARGETLIB STATBNDDIR DYNBNDDIR SRVPGM IFSDIR
 export TGTCCSID DEBUG OPTIMIZE OUTPUT TGTRLS
 ################################################################################
 #
 #                       OS/400 specific definitions.
 #
 ################################################################################
 LIBIFSNAME="/QSYS.LIB/${TARGETLIB}.LIB"
 ################################################################################
 #
 #                               Procedures.
 #
 ################################################################################
 #       action_needed dest [src]
 #
 #       dest is an object to build
 #       if specified, src is an object on which dest depends.
 #
 #       exit 0 (succeeds) if some action has to be taken, else 1.
 action_needed()
 {
        [ ! -e "${1}" ] && return 0
        [ "${2}" ] || return 1
        [ "${1}" -ot "${2}" ] && return 0
        return 1
 }
 #       make_module module_name source_name [additional_definitions]
 #
 #       Compile source name into module if needed.
 #       As side effect, append the module name to variable MODULES.
 #       Set LINK to "YES" if the module has been compiled.
 make_module()
 {
    MODULES="${MODULES} ${1}"
    MODIFSNAME="${LIBIFSNAME}/${1}.MODULE"
    CSRC="`basename \"${2}\"`"
    if action_needed "${MODIFSNAME}" "${2}"
    then    :
    elif [ ! "`sed -e \"/<source name=\\\"${CSRC}\\\">/,/<\\\\/source>/!d\" \
      -e '/<depend /!d'                                                 \
      -e 's/.* name=\"\\([^\"]*\\)\".*/\\1/' < \"${TOPDIR}/treebuild.xml\" |
        while read HDR
        do      if action_needed \"${MODIFSNAME}\" \"${IFSDIR}/include/${HDR}\"
                then    echo recompile
                        break
                fi
        done`" ]
    then    return 0
    fi
    CMD="CRTCMOD MODULE(${TARGETLIB}/${1}) SRCSTMF('${2}')"
    CMD="${CMD} SYSIFCOPT(*IFS64IO) OPTION(*INCDIRFIRST)"
    CMD="${CMD} LOCALETYPE(*LOCALE) FLAG(10)"
    CMD="${CMD} INCDIR('${IFSDIR}/include' ${INCLUDES})"
    CMD="${CMD} TGTCCSID(${TGTCCSID}) TGTRLS(${TGTRLS})"
    CMD="${CMD} OUTPUT(${OUTPUT})"
    CMD="${CMD} OPTIMIZE(${OPTIMIZE})"
    CMD="${CMD} DBGVIEW(${DEBUG})"
    system "${CMD}"
    LINK=YES
 }
 #       Determine DB2 object name from IFS name.
 db2_name()
 {
        basename "${1}"                                                 |
        tr 'a-z-' 'A-Z_'                                                |
        sed -e 's/\..*//'                                               \
            -e 's/^\(.\).*\(.........\)$/\1\2/'
 }
 #       Force enumeration types to be the same size as integers.
 copy_hfile()
 {
        sed -e '1i\
 #pragma enum(int)\
 ' "${@}" -e '$a\
 #pragma enum(pop)\
 '
 }
 ################################################################################
 #
 #                             Script initialization.
 #
 ################################################################################
 SCRIPTDIR=`dirname "${0}"`
 case "${SCRIPTDIR}" in
 /*)     ;;
 *)      SCRIPTDIR="`pwd`/${SCRIPTDIR}"
 esac
 while true
 do      case "${SCRIPTDIR}" in
        */.)    SCRIPTDIR="${SCRIPTDIR%/.}";;
        *)      break;;
        esac
 done
 #  The script directory is supposed to be in ${TOPDIR}/os400.
 TOPDIR=`dirname "${SCRIPTDIR}"`
 export SCRIPTDIR TOPDIR
 cd "${TOPDIR}"
 #  Extract the version from the master compilation XML file.
 VERSION=`sed -e '/^<package /!d'                                        \
            -e 's/^.* version="\([0-9.]*\)".*$/\1/' -e 'q'              \
            < treebuild.xml`
 export VERSION
 ################################################################################
 #       Create the OS/400 library if it does not exist.
 if action_needed "${LIBIFSNAME}"
 then    CMD="CRTLIB LIB(${TARGETLIB}) TEXT('ZLIB: Data compression API')"
        system "${CMD}"
 fi
 #       Create the DOCS source file if it does not exist.
 if action_needed "${LIBIFSNAME}/DOCS.FILE"
 then    CMD="CRTSRCPF FILE(${TARGETLIB}/DOCS) RCDLEN(112)"
        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('Documentation texts')"
        system "${CMD}"
 fi
 #       Copy some documentation files if needed.
 for TEXT in "${TOPDIR}/ChangeLog" "${TOPDIR}/FAQ"                       \
    "${TOPDIR}/README" "${SCRIPTDIR}/README400"
 do      MEMBER="${LIBIFSNAME}/DOCS.FILE/`db2_name \"${TEXT}\"`.MBR"
        if action_needed "${MEMBER}" "${TEXT}"
        then    CMD="CPY OBJ('${TEXT}') TOOBJ('${MEMBER}') TOCCSID(${TGTCCSID})"
                CMD="${CMD} DTAFMT(*TEXT) REPLACE(*YES)"
                system "${CMD}"
        fi
 done
 #       Create the OS/400 source program file for the C header files.
 SRCPF="${LIBIFSNAME}/H.FILE"
 if action_needed "${SRCPF}"
 then    CMD="CRTSRCPF FILE(${TARGETLIB}/H) RCDLEN(112)"
        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: C/C++ header files')"
        system "${CMD}"
 fi
 #       Create the IFS directory for the C header files.
 if action_needed "${IFSDIR}/include"
 then    mkdir -p "${IFSDIR}/include"
 fi
 #       Copy the header files to DB2 library. Link from IFS include directory.
 for HFILE in "${TOPDIR}/"*.h
 do      DEST="${SRCPF}/`db2_name \"${HFILE}\"`.MBR"
        if action_needed "${DEST}" "${HFILE}"
        then    copy_hfile < "${HFILE}" > tmphdrfile
                #       Need to translate to target CCSID.
                CMD="CPY OBJ('`pwd`/tmphdrfile') TOOBJ('${DEST}')"
                CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
                system "${CMD}"
                # touch -r "${HFILE}" "${DEST}"
                rm -f tmphdrfile
        fi
        IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
        if action_needed "${IFSFILE}" "${DEST}"
        then    rm -f "${IFSFILE}"
                ln -s "${DEST}" "${IFSFILE}"
        fi
 done
 #       Install the ILE/RPG header file.
 HFILE="${SCRIPTDIR}/zlib.inc"
 DEST="${SRCPF}/ZLIB.INC.MBR"
 if action_needed "${DEST}" "${HFILE}"
 then    CMD="CPY OBJ('${HFILE}') TOOBJ('${DEST}')"
        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
        system "${CMD}"
        # touch -r "${HFILE}" "${DEST}"
 fi
 IFSFILE="${IFSDIR}/include/`basename \"${HFILE}\"`"
 if action_needed "${IFSFILE}" "${DEST}"
 then    rm -f "${IFSFILE}"
        ln -s "${DEST}" "${IFSFILE}"
 fi
 #      Create and compile the identification source file.
 echo '#pragma comment(user, "ZLIB version '"${VERSION}"'")' > os400.c
 echo '#pragma comment(user, __DATE__)' >> os400.c
 echo '#pragma comment(user, __TIME__)' >> os400.c
 echo '#pragma comment(copyright, "Copyright (C) 1995-2017 Jean-Loup Gailly, Mark Adler. OS/400 version by P. Monnerat.")' >> os400.c
 make_module     OS400           os400.c
 LINK=                           # No need to rebuild service program yet.
 MODULES=
 #       Get source list.
 CSOURCES=`sed -e '/<source name="/!d'                                   \
    -e 's/.* name="\([^"]*\)".*/\1/' < treebuild.xml`
 #       Compile the sources into modules.
 for SRC in ${CSOURCES}
 do      MODULE=`db2_name "${SRC}"`
        make_module "${MODULE}" "${SRC}"
 done
 #       If needed, (re)create the static binding directory.
 if action_needed "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
 then    LINK=YES
 fi
 if [ "${LINK}" ]
 then    rm -rf "${LIBIFSNAME}/${STATBNDDIR}.BNDDIR"
        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${STATBNDDIR})"
        CMD="${CMD} TEXT('ZLIB static binding directory')"
        system "${CMD}"
        for MODULE in ${MODULES}
        do      CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${STATBNDDIR})"
                CMD="${CMD} OBJ((${TARGETLIB}/${MODULE} *MODULE))"
                system "${CMD}"
        done
 fi
 #       The exportation file for service program creation must be in a DB2
 #               source file, so make sure it exists.
 if action_needed "${LIBIFSNAME}/TOOLS.FILE"
 then    CMD="CRTSRCPF FILE(${TARGETLIB}/TOOLS) RCDLEN(112)"
        CMD="${CMD} CCSID(${TGTCCSID}) TEXT('ZLIB: build tools')"
        system "${CMD}"
 fi
 DEST="${LIBIFSNAME}/TOOLS.FILE/BNDSRC.MBR"
 if action_needed "${SCRIPTDIR}/bndsrc" "${DEST}"
 then    CMD="CPY OBJ('${SCRIPTDIR}/bndsrc') TOOBJ('${DEST}')"
        CMD="${CMD} TOCCSID(${TGTCCSID}) DTAFMT(*TEXT) REPLACE(*YES)"
        system "${CMD}"
        # touch -r "${SCRIPTDIR}/bndsrc" "${DEST}"
        LINK=YES
 fi
 #       Build the service program if needed.
 if action_needed "${LIBIFSNAME}/${SRVPGM}.SRVPGM"
 then    LINK=YES
 fi
 if [ "${LINK}" ]
 then    CMD="CRTSRVPGM SRVPGM(${TARGETLIB}/${SRVPGM})"
        CMD="${CMD} SRCFILE(${TARGETLIB}/TOOLS) SRCMBR(BNDSRC)"
        CMD="${CMD} MODULE(${TARGETLIB}/OS400)"
        CMD="${CMD} BNDDIR(${TARGETLIB}/${STATBNDDIR})"
        CMD="${CMD} TEXT('ZLIB ${VERSION} dynamic library')"
        CMD="${CMD} TGTRLS(${TGTRLS})"
        system "${CMD}"
        LINK=YES
        #       Duplicate the service program for a versioned backup.
        BACKUP=`echo "${SRVPGM}${VERSION}"                              |
                sed -e 's/.*\(..........\)$/\1/' -e 's/\./_/g'`
        BACKUP="`db2_name \"${BACKUP}\"`"
        BKUPIFSNAME="${LIBIFSNAME}/${BACKUP}.SRVPGM"
        rm -f "${BKUPIFSNAME}"
        CMD="CRTDUPOBJ OBJ(${SRVPGM}) FROMLIB(${TARGETLIB})"
        CMD="${CMD} OBJTYPE(*SRVPGM) NEWOBJ(${BACKUP})"
        system "${CMD}"
 fi
 #       If needed, (re)create the dynamic binding directory.
 if action_needed "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
 then    LINK=YES
 fi
 if [ "${LINK}" ]
 then    rm -rf "${LIBIFSNAME}/${DYNBNDDIR}.BNDDIR"
        CMD="CRTBNDDIR BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
        CMD="${CMD} TEXT('ZLIB dynamic binding directory')"
        system "${CMD}"
        CMD="ADDBNDDIRE BNDDIR(${TARGETLIB}/${DYNBNDDIR})"
        CMD="${CMD} OBJ((*LIBL/${SRVPGM} *SRVPGM))"
        system "${CMD}"
 fi
--- a/compat/zlib/os400/zlib.inc
+++ b/compat/zlib/os400/zlib.inc
@@ -1,7 +1,7 @@
      *  ZLIB.INC - Interface to the general purpose compression library
      *
      *  ILE RPG400 version by Patrick Monnerat, DATASPHERE.
-      *  Version 1.2.8
+      *  Version 1.2.11
      *
      *
      *  WARNING:
@@ -22,12 +22,12 @@
      *
      *  Versioning information.
      *
-     D ZLIB_VERSION    C                   '1.2.8'
+     D ZLIB_VERSION    C                   '1.2.11'
-     D ZLIB_VERNUM     C                   X'1280'
+     D ZLIB_VERNUM     C                   X'12a0'
     D ZLIB_VER_MAJOR  C                   1
     D ZLIB_VER_MINOR  C                   2
     D ZLIB_VER_REVISION...
-     D                 C                   8
+     D                 C                   11
     D ZLIB_VER_SUBREVISION...
     D                 C                   0
      *
@@ -50,7 +50,7 @@
     D Z_DATA_ERROR    C                   -3
     D Z_MEM_ERROR     C                   -4
     D Z_BUF_ERROR     C                   -5
-     DZ_VERSION_ERROR  C                   -6
+     D Z_VERSION_ERROR C                   -6
      *
     D Z_NO_COMPRESSION...
     D                 C                   0
@@ -80,6 +80,7 @@
      *
     D z_streamp       S               *                                        Stream struct ptr
     D gzFile          S               *                                        File pointer
     D gz_headerp      S               *
     D z_off_t         S             10i 0                                      Stream offsets
     D z_off64_t       S             20i 0                                      Stream offsets
      *
@@ -132,6 +133,12 @@
     D  source                    65535    const options(*varsize)              Source buffer
     D  sourceLen                    10U 0 value                                Source length
      *
     D uncompress2     PR            10I 0 extproc('uncompress2')
     D  dest                      65535    options(*varsize)                    Destination buffer
     D  destLen                      10U 0                                      Destination length
     D  source                    65535    const options(*varsize)              Source buffer
     D  sourceLen                    10U 0                                      Source length
      *
      /if not defined(LARGE_FILES)
     D gzopen          PR                  extproc('gzopen')
     D                                     like(gzFile)
@@ -168,11 +175,23 @@
     D  buf                       65535    options(*varsize)                    Buffer
     D  len                          10u 0 value                                Buffer length
      *
     D gzfread          PR           20I 0 extproc('gzfread')
     D  buf                       65535    options(*varsize)                    Buffer
     D  size                         20u 0 value                                Buffer length
     D  nitems                       20u 0 value                                Buffer length
     D  file                               value like(gzFile)                   File pointer
      *
     D gzwrite         PR            10I 0 extproc('gzwrite')
     D  file                               value like(gzFile)                   File pointer
     D  buf                       65535    const options(*varsize)              Buffer
     D  len                          10u 0 value                                Buffer length
      *
     D gzfwrite         PR           20I 0 extproc('gzfwrite')
     D  buf                       65535    options(*varsize)                    Buffer
     D  size                         20u 0 value                                Buffer length
     D  nitems                       20u 0 value                                Buffer length
     D  file                               value like(gzFile)                   File pointer
      *
     D gzputs          PR            10I 0 extproc('gzputs')
     D  file                               value like(gzFile)                   File pointer
     D  s                              *   value options(*string)               String to output
@@ -252,6 +271,9 @@
      /endif
      *
     D gzeof           PR            10i 0 extproc('gzeof')
     D  file                               value like(gzFile)                   File pointer
      *
     D gzdirect        PR            10i 0 extproc('gzdirect')
     D  file                               value like(gzFile)                   File pointer
      *
     D gzclose_r       PR            10i 0 extproc('gzclose_r')
@@ -311,7 +333,7 @@
     D  method                       10I 0 value                                Compression method
     D  windowBits                   10I 0 value                                log2(window size)
     D  memLevel                     10I 0 value                                Mem/cmpress tradeoff
-     D  strategy                     10I 0 value                                Compression stategy
+     D  strategy                     10I 0 value                                Compression strategy
     D  version                        *   value options(*string)               Version string
     D  stream_size                  10i 0 value                                Stream struct. size
      *
@@ -331,7 +353,14 @@
     D deflateParams   PR            10I 0 extproc('deflateParams')             Change level & strat
     D  strm                               like(z_stream)                       Compression stream
     D  level                        10I 0 value                                Compression level
-     D  strategy                     10I 0 value                                Compression stategy
+     D  strategy                     10I 0 value                                Compression strategy
      *
     D deflateTune     PR            10I 0 extproc('deflateTune')
     D  strm                               like(z_stream)                       Compression stream
     D  good                         10I 0 value
     D  lazy                         10I 0 value
     D  nice                         10I 0 value
     D  chain                        10I 0 value
      *
     D deflateBound    PR            10U 0 extproc('deflateBound')              Change level & strat
     D  strm                               like(z_stream)                       Compression stream
@@ -363,6 +392,12 @@
     D                 PR            10I 0 extproc('inflateGetDictionary')      Get dictionary
     D  strm                               like(z_stream)                       Expansion stream
     D  dictionary                65535    options(*varsize)                    Dictionary bytes
     D  dictLength                   10U 0                                      Dictionary length
      *
     D deflateGetDictionary...
     D                 PR            10I 0 extproc('deflateGetDictionary')      Get dictionary
     D  strm                               like(z_stream)                       Expansion stream
     D  dictionary                65535    options(*varsize)                    Dictionary bytes
     D  dictLength                   10U 0                                      Dictionary length
      *
     D inflateSync     PR            10I 0 extproc('inflateSync')               Sync. expansion
@@ -387,6 +422,25 @@
     D inflateMark     PR            10I 0 extproc('inflateMark')               Get inflate info
     D  strm                               like(z_stream)                       Expansion stream
      *
     D inflateCodesUsed...
                       PR            20U 0 extproc('inflateCodesUsed')
     D  strm                               like(z_stream)                       Expansion stream
      *
     D inflateValidate...
                       PR            20U 0 extproc('inflateValidate')
     D  strm                               like(z_stream)                       Expansion stream
     D  check                        10I 0 value
      *
     D inflateGetHeader...
                       PR            10U 0 extproc('inflateGetHeader')
     D  strm                               like(z_stream)                       Expansion stream
     D  head                               like(gz_headerp)
      *
     D deflateSetHeader...
                       PR            10U 0 extproc('deflateSetHeader')
     D  strm                               like(z_stream)                       Expansion stream
     D  head                               like(gz_headerp)
      *
     D inflateBackInit...
     D                 PR            10I 0 extproc('inflateBackInit_')
     D  strm                               like(z_stream)                       Expansion stream
@@ -417,11 +471,33 @@
     D  buf                       65535    const options(*varsize)              Bytes to accumulate
     D  len                          10U 0 value                                Buffer length
      *
     D adler32_combine...
                       PR            10U 0 extproc('adler32_combine')           New checksum
     D  adler1                       10U 0 value                                Old checksum
     D  adler2                       10U 0 value                                Old checksum
     D  len2                         20U 0 value                                Buffer length
      *
     D adler32_z       PR            10U 0 extproc('adler32_z')                 New checksum
     D  adler                        10U 0 value                                Old checksum
     D  buf                       65535    const options(*varsize)              Bytes to accumulate
     D  len                          20U 0 value                                Buffer length
      *
     D crc32           PR            10U 0 extproc('crc32')                     New checksum
     D  crc                          10U 0 value                                Old checksum
     D  buf                       65535    const options(*varsize)              Bytes to accumulate
     D  len                          10U 0 value                                Buffer length
      *
     D crc32_combine...
                       PR            10U 0 extproc('crc32_combine')             New checksum
     D  crc1                         10U 0 value                                Old checksum
     D  crc2                         10U 0 value                                Old checksum
     D  len2                         20U 0 value                                Buffer length
      *
     D crc32_z         PR            10U 0 extproc('crc32_z')                   New checksum
     D  crc                          10U 0 value                                Old checksum
     D  buf                       65535    const options(*varsize)              Bytes to accumulate
     D  len                          20U 0 value                                Buffer length
      *
      **************************************************************************
      *                     Miscellaneous function prototypes
      **************************************************************************
--- a/compat/zlib/qnx/package.qpg
+++ b/compat/zlib/qnx/package.qpg
@@ -25,10 +25,10 @@
      <QPG:Files>
         <QPG:Add file="../zconf.h" install="/opt/include/" user="root:sys" permission="644"/>
         <QPG:Add file="../zlib.h" install="/opt/include/" user="root:sys" permission="644"/>
-         <QPG:Add file="../libz.so.1.2.8" install="/opt/lib/" user="root:bin" permission="644"/>
+         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" user="root:bin" permission="644"/>
-         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.8"/>
+         <QPG:Add file="libz.so" install="/opt/lib/" component="dev" filetype="symlink" linkto="libz.so.1.2.11"/>
-         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.8"/>
+         <QPG:Add file="libz.so.1" install="/opt/lib/" filetype="symlink" linkto="libz.so.1.2.11"/>
-         <QPG:Add file="../libz.so.1.2.8" install="/opt/lib/" component="slib"/>
+         <QPG:Add file="../libz.so.1.2.11" install="/opt/lib/" component="slib"/>
      </QPG:Files>
      <QPG:PackageFilter>
@@ -63,7 +63,7 @@
            </QPM:ProductDescription>
            <QPM:ReleaseDescription>
-               <QPM:ReleaseVersion>1.2.8</QPM:ReleaseVersion>
+               <QPM:ReleaseVersion>1.2.11</QPM:ReleaseVersion>
               <QPM:ReleaseUrgency>Medium</QPM:ReleaseUrgency>
               <QPM:ReleaseStability>Stable</QPM:ReleaseStability>
               <QPM:ReleaseNoteMinor></QPM:ReleaseNoteMinor>
--- a/compat/zlib/test/example.c
+++ b/compat/zlib/test/example.c
@@ -1,5 +1,5 @@
 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-2006, 2011 Jean-loup Gailly.
+ * Copyright (C) 1995-2006, 2011, 2016 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -26,13 +26,13 @@
    } \
 }
-z_const char hello[] = "hello, hello!";
+static z_const char hello[] = "hello, hello!";
 /* "hello world" would be more standard, but the repeated "hello"
 * stresses the compression code better, sorry...
 */
-const char dictionary[] = "hello";
+static const char dictionary[] = "hello";
-uLong dictId; /* Adler32 value of the dictionary */
+static uLong dictId;    /* Adler32 value of the dictionary */
 void test_deflate       OF((Byte *compr, uLong comprLen));
 void test_inflate       OF((Byte *compr, uLong comprLen,
@@ -59,13 +59,13 @@ void *myalloc(q, n, m)
    void *q;
    unsigned n, m;
 {
-    q = Z_NULL;
+    (void)q;
    return calloc(n, m);
 }
 void myfree(void *q, void *p)
 {
-    q = Z_NULL;
+    (void)q;
    free(p);
 }
@@ -432,7 +432,7 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
    d_stream.next_out = uncompr;
    d_stream.avail_out = (uInt)uncomprLen;
-    inflate(&d_stream, Z_NO_FLUSH);
+    err = inflate(&d_stream, Z_NO_FLUSH);
    CHECK_ERR(err, "inflate");
    d_stream.avail_in = (uInt)comprLen-2;   /* read all compressed data */
@@ -573,7 +573,8 @@ int main(argc, argv)
    }
 #ifdef Z_SOLO
-    argc = strlen(argv[0]);
+    (void)argc;
    (void)argv;
 #else
    test_compress(compr, comprLen, uncompr, uncomprLen);
--- a/compat/zlib/test/infcover.c
+++ b/compat/zlib/test/infcover.c
@@ -1,5 +1,5 @@
 /* infcover.c -- test zlib's inflate routines with full code coverage
- * Copyright (C) 2011 Mark Adler
+ * Copyright (C) 2011, 2016 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -237,14 +237,14 @@ local void mem_done(z_stream *strm, char *prefix)
 /* Decode a hexadecimal string, set *len to length, in[] to the bytes.  This
   decodes liberally, in that hex digits can be adjacent, in which case two in
-   a row writes a byte.  Or they can delimited by any non-hex character, where
+   a row writes a byte.  Or they can be delimited by any non-hex character,
-   the delimiters are ignored except when a single hex digit is followed by a
+   where the delimiters are ignored except when a single hex digit is followed
-   delimiter in which case that single digit writes a byte.  The returned
+   by a delimiter, where that single digit writes a byte.  The returned data is
-   data is allocated and must eventually be freed.  NULL is returned if out of
+   allocated and must eventually be freed.  NULL is returned if out of memory.
-   memory.  If the length is not needed, then len can be NULL. */
+   If the length is not needed, then len can be NULL. */
 local unsigned char *h2b(const char *hex, unsigned *len)
 {
-    unsigned char *in;
+    unsigned char *in, *re;
    unsigned next, val;
    in = malloc((strlen(hex) + 1) >> 1);
@@ -268,8 +268,8 @@ local unsigned char *h2b(const char *hex, unsigned *len)
    } while (*hex++);       /* go through the loop with the terminating null */
    if (len != NULL)
        *len = next;
-    in = reallocf(in, next);
+    re = realloc(in, next);
-    return in;
+    return re == NULL ? in : re;
 }
 /* generic inflate() run, where hex is the hexadecimal input data, what is the
--- a/compat/zlib/test/minigzip.c
+++ b/compat/zlib/test/minigzip.c
@@ -1,5 +1,5 @@
 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995-2006, 2010, 2011 Jean-loup Gailly.
+ * Copyright (C) 1995-2006, 2010, 2011, 2016 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -40,7 +40,7 @@
 #  define SET_BINARY_MODE(file)
 #endif
-#ifdef _MSC_VER
+#if defined(_MSC_VER) && _MSC_VER < 1900
 #  define snprintf _snprintf
 #endif
@@ -156,14 +156,14 @@ void *myalloc(q, n, m)
    void *q;
    unsigned n, m;
 {
-    q = Z_NULL;
+    (void)q;
    return calloc(n, m);
 }
 void myfree(q, p)
    void *q, *p;
 {
-    q = Z_NULL;
+    (void)q;
    free(p);
 }
@@ -333,7 +333,7 @@ const char *gzerror(gz, err)
 #endif
-char *prog;
+static char *prog;
 void error            OF((const char *msg));
 void gz_compress      OF((FILE   *in, gzFile out));
@@ -500,7 +500,7 @@ void file_uncompress(file)
    char *infile, *outfile;
    FILE  *out;
    gzFile in;
-    size_t len = strlen(file);
+    unsigned len = strlen(file);
    if (len + strlen(GZ_SUFFIX) >= sizeof(buf)) {
        fprintf(stderr, "%s: filename too long\n", prog);
--- a/compat/zlib/treebuild.xml
+++ b/compat/zlib/treebuild.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" ?>
-<package name="zlib" version="1.2.8">
+<package name="zlib" version="1.2.11">
-    <library name="zlib" dlversion="1.2.8" dlname="z">
+    <library name="zlib" dlversion="1.2.11" dlname="z">
 	<property name="description"> zip compression library </property>
 	<property name="include-target-dir" value="$(@PACKAGE/install-includedir)" />
@@ -101,7 +101,7 @@
 <!--
 CFLAGS=-O
 #CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-g -DDEBUG
+#CFLAGS=-g -DZLIB_DEBUG
 #CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
 #           -Wstrict-prototypes -Wmissing-prototypes
--- a/compat/zlib/trees.c
+++ b/compat/zlib/trees.c
@@ -1,5 +1,5 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-2012 Jean-loup Gailly
+ * Copyright (C) 1995-2017 Jean-loup Gailly
 * detect_data_type() function provided freely by Cosmin Truta, 2006
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -36,7 +36,7 @@
 #include "deflate.h"
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 #  include <ctype.h>
 #endif
@@ -122,13 +122,13 @@ struct static_tree_desc_s {
    int     max_length;          /* max bit length for the codes */
 };
-local static_tree_desc  static_l_desc =
+local const static_tree_desc  static_l_desc =
 {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
-local static_tree_desc  static_d_desc =
+local const static_tree_desc  static_d_desc =
 {static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS};
-local static_tree_desc  static_bl_desc =
+local const static_tree_desc  static_bl_desc =
 {(const ct_data *)0, extra_blbits, 0,   BL_CODES, MAX_BL_BITS};
 /* ===========================================================================
@@ -152,18 +152,16 @@ local int  detect_data_type OF((deflate_state *s));
 local unsigned bi_reverse OF((unsigned value, int length));
 local void bi_windup      OF((deflate_state *s));
 local void bi_flush       OF((deflate_state *s));
 local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
                              int header));
 #ifdef GEN_TREES_H
 local void gen_trees_header OF((void));
 #endif
-#ifndef DEBUG
+#ifndef ZLIB_DEBUG
 #  define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
   /* Send a code of the given tree. c and tree must not have side effects */
-#else /* DEBUG */
+#else /* !ZLIB_DEBUG */
 #  define send_code(s, c, tree) \
     { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
       send_bits(s, tree[c].Code, tree[c].Len); }
@@ -182,7 +180,7 @@ local void gen_trees_header OF((void));
 * Send a value on a given number of bits.
 * IN assertion: length <= 16 and value fits in length bits.
 */
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
 local void send_bits      OF((deflate_state *s, int value, int length));
 local void send_bits(s, value, length)
@@ -208,12 +206,12 @@ local void send_bits(s, value, length)
        s->bi_valid += length;
    }
 }
-#else /* !DEBUG */
+#else /* !ZLIB_DEBUG */
 #define send_bits(s, value, length) \
 { int len = length;\
  if (s->bi_valid > (int)Buf_size - len) {\
-    int val = value;\
+    int val = (int)value;\
    s->bi_buf |= (ush)val << s->bi_valid;\
    put_short(s, s->bi_buf);\
    s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
@@ -223,7 +221,7 @@ local void send_bits(s, value, length)
    s->bi_valid += len;\
  }\
 }
-#endif /* DEBUG */
+#endif /* ZLIB_DEBUG */
 /* the arguments must not have side effects */
@@ -317,7 +315,7 @@ local void tr_static_init()
 * Genererate the file trees.h describing the static trees.
 */
 #ifdef GEN_TREES_H
-#  ifndef DEBUG
+#  ifndef ZLIB_DEBUG
 #    include <stdio.h>
 #  endif
@@ -394,7 +392,7 @@ void ZLIB_INTERNAL _tr_init(s)
    s->bi_buf = 0;
    s->bi_valid = 0;
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->compressed_len = 0L;
    s->bits_sent = 0L;
 #endif
@@ -522,12 +520,12 @@ local void gen_bitlen(s, desc)
        xbits = 0;
        if (n >= base) xbits = extra[n-base];
        f = tree[n].Freq;
-        s->opt_len += (ulg)f * (bits + xbits);
+        s->opt_len += (ulg)f * (unsigned)(bits + xbits);
-        if (stree) s->static_len += (ulg)f * (stree[n].Len + xbits);
+        if (stree) s->static_len += (ulg)f * (unsigned)(stree[n].Len + xbits);
    }
    if (overflow == 0) return;
-    Trace((stderr,"\nbit length overflow\n"));
+    Tracev((stderr,"\nbit length overflow\n"));
    /* This happens for example on obj2 and pic of the Calgary corpus */
    /* Find the first bit length which could increase: */
@@ -554,9 +552,8 @@ local void gen_bitlen(s, desc)
            m = s->heap[--h];
            if (m > max_code) continue;
            if ((unsigned) tree[m].Len != (unsigned) bits) {
-                Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
+                Tracev((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
-                s->opt_len += ((long)bits - (long)tree[m].Len)
+                s->opt_len += ((ulg)bits - tree[m].Len) * tree[m].Freq;
                              *(long)tree[m].Freq;
                tree[m].Len = (ush)bits;
            }
            n--;
@@ -578,7 +575,7 @@ local void gen_codes (tree, max_code, bl_count)
    ushf *bl_count;            /* number of codes at each bit length */
 {
    ush next_code[MAX_BITS+1]; /* next code value for each bit length */
-    ush code = 0;              /* running code value */
+    unsigned code = 0;         /* running code value */
    int bits;                  /* bit index */
    int n;                     /* code index */
@@ -586,7 +583,8 @@ local void gen_codes (tree, max_code, bl_count)
     * without bit reversal.
     */
    for (bits = 1; bits <= MAX_BITS; bits++) {
-        next_code[bits] = code = (code + bl_count[bits-1]) << 1;
+        code = (code + bl_count[bits-1]) << 1;
        next_code[bits] = (ush)code;
    }
    /* Check that the bit counts in bl_count are consistent. The last code
     * must be all ones.
@@ -599,7 +597,7 @@ local void gen_codes (tree, max_code, bl_count)
        int len = tree[n].Len;
        if (len == 0) continue;
        /* Now reverse the bits */
-        tree[n].Code = bi_reverse(next_code[len]++, len);
+        tree[n].Code = (ush)bi_reverse(next_code[len]++, len);
        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
             n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
@@ -821,7 +819,7 @@ local int build_bl_tree(s)
        if (s->bl_tree[bl_order[max_blindex]].Len != 0) break;
    }
    /* Update opt_len to include the bit length tree and counts */
-    s->opt_len += 3*(max_blindex+1) + 5+5+4;
+    s->opt_len += 3*((ulg)max_blindex+1) + 5+5+4;
    Tracev((stderr, "\ndyn trees: dyn %ld, stat %ld",
            s->opt_len, s->static_len));
@@ -869,11 +867,17 @@ void ZLIB_INTERNAL _tr_stored_block(s, buf, stored_len, last)
    int last;         /* one if this is the last block for a file */
 {
    send_bits(s, (STORED_BLOCK<<1)+last, 3);    /* send block type */
-#ifdef DEBUG
+    bi_windup(s);        /* align on byte boundary */
    put_short(s, (ush)stored_len);
    put_short(s, (ush)~stored_len);
    zmemcpy(s->pending_buf + s->pending, (Bytef *)buf, stored_len);
    s->pending += stored_len;
 #ifdef ZLIB_DEBUG
    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
    s->compressed_len += (stored_len + 4) << 3;
    s->bits_sent += 2*16;
    s->bits_sent += stored_len<<3;
 #endif
    copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
 }
 /* ===========================================================================
@@ -894,7 +898,7 @@ void ZLIB_INTERNAL _tr_align(s)
 {
    send_bits(s, STATIC_TREES<<1, 3);
    send_code(s, END_BLOCK, static_ltree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
 #endif
    bi_flush(s);
@@ -902,7 +906,7 @@ void ZLIB_INTERNAL _tr_align(s)
 /* ===========================================================================
 * Determine the best encoding for the current block: dynamic trees, static
- * trees or store, and output the encoded block to the zip file.
+ * trees or store, and write out the encoded block.
 */
 void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
    deflate_state *s;
@@ -974,7 +978,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
        send_bits(s, (STATIC_TREES<<1)+last, 3);
        compress_block(s, (const ct_data *)static_ltree,
                       (const ct_data *)static_dtree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 3 + s->static_len;
 #endif
    } else {
@@ -983,7 +987,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
                       max_blindex+1);
        compress_block(s, (const ct_data *)s->dyn_ltree,
                       (const ct_data *)s->dyn_dtree);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 3 + s->opt_len;
 #endif
    }
@@ -995,7 +999,7 @@ void ZLIB_INTERNAL _tr_flush_block(s, buf, stored_len, last)
    if (last) {
        bi_windup(s);
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
        s->compressed_len += 7;  /* align on byte boundary */
 #endif
    }
@@ -1090,7 +1094,7 @@ local void compress_block(s, ltree, dtree)
            send_code(s, code, dtree);       /* send the distance code */
            extra = extra_dbits[code];
            if (extra != 0) {
-                dist -= base_dist[code];
+                dist -= (unsigned)base_dist[code];
                send_bits(s, dist, extra);   /* send the extra distance bits */
            }
        } /* literal or match pair ? */
@@ -1193,34 +1197,7 @@ local void bi_windup(s)
    }
    s->bi_buf = 0;
    s->bi_valid = 0;
-#ifdef DEBUG
+#ifdef ZLIB_DEBUG
    s->bits_sent = (s->bits_sent+7) & ~7;
 #endif
 }
 /* ===========================================================================
 * Copy a stored block, storing first the length and its
 * one's complement if requested.
 */
 local void copy_block(s, buf, len, header)
    deflate_state *s;
    charf    *buf;    /* the input data */
    unsigned len;     /* its length */
    int      header;  /* true if block header must be written */
 {
    bi_windup(s);        /* align on byte boundary */
    if (header) {
        put_short(s, (ush)len);
        put_short(s, (ush)~len);
 #ifdef DEBUG
        s->bits_sent += 2*16;
 #endif
    }
 #ifdef DEBUG
    s->bits_sent += (ulg)len<<3;
 #endif
    while (len--) {
        put_byte(s, *buf++);
    }
 }
--- a/compat/zlib/uncompr.c
+++ b/compat/zlib/uncompr.c
@@ -1,5 +1,5 @@
 /* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
+ * Copyright (C) 1995-2003, 2010, 2014, 2016 Jean-loup Gailly, Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -9,51 +9,85 @@
 #include "zlib.h"
 /* ===========================================================================
-     Decompresses the source buffer into the destination buffer.  sourceLen is
+     Decompresses the source buffer into the destination buffer.  *sourceLen is
-   the byte length of the source buffer. Upon entry, destLen is the total
+   the byte length of the source buffer. Upon entry, *destLen is the total size
-   size of the destination buffer, which must be large enough to hold the
+   of the destination buffer, which must be large enough to hold the entire
-   entire uncompressed data. (The size of the uncompressed data must have
+   uncompressed data. (The size of the uncompressed data must have been saved
-   been saved previously by the compressor and transmitted to the decompressor
+   previously by the compressor and transmitted to the decompressor by some
-   by some mechanism outside the scope of this compression library.)
+   mechanism outside the scope of this compression library.) Upon exit,
-   Upon exit, destLen is the actual size of the compressed buffer.
+   *destLen is the size of the decompressed data and *sourceLen is the number
   of source bytes consumed. Upon return, source + *sourceLen points to the
   first unused input byte.
-     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
+     uncompress returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer, or
-   buffer, or Z_DATA_ERROR if the input data was corrupted.
+   Z_DATA_ERROR if the input data was corrupted, including if the input data is
   an incomplete zlib stream.
 */
 int ZEXPORT uncompress2 (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong *sourceLen;
 {
    z_stream stream;
    int err;
    const uInt max = (uInt)-1;
    uLong len, left;
    Byte buf[1];    /* for detection of incomplete stream when *destLen == 0 */
    len = *sourceLen;
    if (*destLen) {
        left = *destLen;
        *destLen = 0;
    }
    else {
        left = 1;
        dest = buf;
    }
    stream.next_in = (z_const Bytef *)source;
    stream.avail_in = 0;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
    stream.opaque = (voidpf)0;
    err = inflateInit(&stream);
    if (err != Z_OK) return err;
    stream.next_out = dest;
    stream.avail_out = 0;
    do {
        if (stream.avail_out == 0) {
            stream.avail_out = left > (uLong)max ? max : (uInt)left;
            left -= stream.avail_out;
        }
        if (stream.avail_in == 0) {
            stream.avail_in = len > (uLong)max ? max : (uInt)len;
            len -= stream.avail_in;
        }
        err = inflate(&stream, Z_NO_FLUSH);
    } while (err == Z_OK);
    *sourceLen -= len + stream.avail_in;
    if (dest != buf)
        *destLen = stream.total_out;
    else if (stream.total_out && err == Z_BUF_ERROR)
        left = 1;
    inflateEnd(&stream);
    return err == Z_STREAM_END ? Z_OK :
           err == Z_NEED_DICT ? Z_DATA_ERROR  :
           err == Z_BUF_ERROR && left + stream.avail_out ? Z_DATA_ERROR :
           err;
 }
 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
    const Bytef *source;
    uLong sourceLen;
 {
-    z_stream stream;
+    return uncompress2(dest, destLen, source, &sourceLen);
    int err;
    stream.next_in = (z_const Bytef *)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
    err = inflateInit(&stream);
    if (err != Z_OK) return err;
    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
            return Z_DATA_ERROR;
        return err;
    }
    *destLen = stream.total_out;
    err = inflateEnd(&stream);
    return err;
 }
--- a/compat/zlib/win32/Makefile.gcc
+++ b/compat/zlib/win32/Makefile.gcc
@@ -39,7 +39,7 @@ IMPLIB    = libz.dll.a
 SHARED_MODE=0
 #LOC = -DASMV
-#LOC = -DDEBUG -g
+#LOC = -DZLIB_DEBUG -g
 PREFIX =
 CC = $(PREFIX)gcc
--- a/compat/zlib/win32/Makefile.msc
+++ b/compat/zlib/win32/Makefile.msc
@@ -1,5 +1,5 @@
 # Makefile for zlib using Microsoft (Visual) C
-# zlib is copyright (C) 1995-2006 Jean-loup Gailly and Mark Adler
+# zlib is copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
 #
 # Usage:
 #   nmake -f win32/Makefile.msc                          (standard build)
--- a/compat/zlib/win32/README-WIN32.txt
+++ b/compat/zlib/win32/README-WIN32.txt
@@ -1,6 +1,6 @@
 ZLIB DATA COMPRESSION LIBRARY
-zlib 1.2.8 is a general purpose data compression library.  All the code is
+zlib 1.2.11 is a general purpose data compression library.  All the code is
 thread safe.  The data format used by the zlib library is described by RFCs
 (Request for Comments) 1950 to 1952 in the files
 http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
@@ -22,7 +22,7 @@ before asking for help.
 Manifest:
-The package zlib-1.2.8-win32-x86.zip will contain the following files:
+The package zlib-1.2.11-win32-x86.zip will contain the following files:
  README-WIN32.txt This document
  ChangeLog        Changes since previous zlib packages
@@ -72,7 +72,7 @@ are too numerous to cite here.
 Copyright notice:
-  (C) 1995-2012 Jean-loup Gailly and Mark Adler
+  (C) 1995-2017 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
--- a/compat/zlib/win32/README.txt
+++ b/compat/zlib/win32/README.txt
@@ -6,7 +6,7 @@ What's here
 Source
 ======
-  zlib version 1.2.8
+  zlib version 1.2.11
  available at http://www.gzip.org/zlib/
@@ -25,9 +25,9 @@ Build info
  Contributed by Jan Nijtmans.
  Compiler:
-    i686-w64-mingw32-gcc (GCC) 4.5.3
+    i686-w64-mingw32-gcc (GCC) 5.4.0
  Library:
-    mingw64-i686-runtime/headers: 3.0b_svn5747-1
+    mingw64-i686-runtime/headers: 5.0.0
  Build commands:
    i686-w64-mingw32-gcc -c -DASMV contrib/asm686/match.S
    i686-w64-mingw32-gcc -c -DASMINF -I. -O3 contrib/inflate86/inffas86.c
@@ -37,7 +37,7 @@ Build info
 Copyright notice
 ================
-  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
+  Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
--- a/compat/zlib/win32/USAGE.txt
+++ b/compat/zlib/win32/USAGE.txt
@@ -2,6 +2,9 @@
 Installing ZLIB1.DLL
 ====================
  Copy ZLIB1.DLL to the SYSTEM or the SYSTEM32 directory.
  If you want to install the 32-bit dll on a 64-bit
  machine, use the SysWOW64 directory instead.
 Using ZLIB1.DLL with Microsoft Visual C++
@@ -20,12 +23,17 @@ Using ZLIB1.DLL with gcc/MinGW
   1. Install the supplied header files "zlib.h" and "zconf.h"
      into the INCLUDE directory.
-   2. Copy the supplied library file "zdll.lib" to "libzdll.a":
+   2. (32-bit): Copy the supplied library file "zdll.lib" to "libzdll.a":
        cp lib/zdll.lib lib/libzdll.a
      OR
-   2' Build the import library from the supplied "zlib.def":
+   2'. (64-bit): Copy the supplied library file "libz.dll.a" to "libzdll.a":
        cp lib/libz.dll.a lib/libzdll.a
      OR
   2'' Build the import library from the supplied "zlib.def":
        dlltool -D zlib1.dll -d lib/zlib.def -l lib/libzdll.a
   3. Install "libzdll.a" into the LIB directory.
--- a/compat/zlib/win32/VisualC.txt
+++ b/compat/zlib/win32/VisualC.txt
@@ -1,3 +1,3 @@
 To build zlib using the Microsoft Visual C++ environment,
-use the appropriate project from the projects/ directory.
+use the appropriate project from the contrib/vstudio/ directory.
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Steve Dower	490cb690a8	Imported Tcl 8.6.9	2018-12-11 10:07:57 -08:00
Steve Dower	0343d03b22	Merge pull request #4 from csabella/8.6.8-tcl Import Tcl-code 8.6.8	2018-02-23 08:20:05 -08:00
Cheryl Sabella	cc7c413b4f	Import Tcl-code 8.6.8	2018-02-22 14:28:00 -05:00
`@@ -1,3 +1,3 @@`

	`To build zlib using the Microsoft Visual C++ environment,`	`To build zlib using the Microsoft Visual C++ environment,`
	`use the appropriate project from the projects/ directory.`	`use the appropriate project from the contrib/vstudio/ directory.`