Import OpenSSL 1.0.2k (as of svn r86089)

doc/crypto/BIO_f_base64.pod

@@ -0,0 +1,82 @@
+=pod
+
+=head1 NAME
+
+BIO_f_base64 - base64 BIO filter
+
+=head1 SYNOPSIS
+
+ #include <openssl/bio.h>
+ #include <openssl/evp.h>
+
+ BIO_METHOD *	BIO_f_base64(void);
+
+=head1 DESCRIPTION
+
+BIO_f_base64() returns the base64 BIO method. This is a filter
+BIO that base64 encodes any data written through it and decodes
+any data read through it.
+
+Base64 BIOs do not support BIO_gets() or BIO_puts(). 
+
+BIO_flush() on a base64 BIO that is being written through is
+used to signal that no more data is to be encoded: this is used
+to flush the final block through the BIO.
+
+The flag BIO_FLAGS_BASE64_NO_NL can be set with BIO_set_flags()
+to encode the data all on one line or expect the data to be all
+on one line.
+
+=head1 NOTES
+
+Because of the format of base64 encoding the end of the encoded
+block cannot always be reliably determined.
+
+=head1 RETURN VALUES
+
+BIO_f_base64() returns the base64 BIO method.
+
+=head1 EXAMPLES
+
+Base64 encode the string "Hello World\n" and write the result
+to standard output:
+
+ BIO *bio, *b64;
+ char message[] = "Hello World \n";
+
+ b64 = BIO_new(BIO_f_base64());
+ bio = BIO_new_fp(stdout, BIO_NOCLOSE);
+ BIO_push(b64, bio);
+ BIO_write(b64, message, strlen(message));
+ BIO_flush(b64);
+
+ BIO_free_all(b64);
+
+Read Base64 encoded data from standard input and write the decoded
+data to standard output:
+
+ BIO *bio, *b64, *bio_out;
+ char inbuf[512];
+ int inlen;
+
+ b64 = BIO_new(BIO_f_base64());
+ bio = BIO_new_fp(stdin, BIO_NOCLOSE);
+ bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
+ BIO_push(b64, bio);
+ while((inlen = BIO_read(b64, inbuf, 512)) > 0) 
+	BIO_write(bio_out, inbuf, inlen);
+
+ BIO_flush(bio_out);
+ BIO_free_all(b64);
+
+=head1 BUGS
+
+The ambiguity of EOF in base64 encoded data can cause additional
+data following the base64 encoded block to be misinterpreted.
+
+There should be some way of specifying a test that the BIO can perform
+to reliably determine EOF (for example a MIME boundary).
+
+=head1 SEE ALSO
+
+TBA