BIO_f_base64 man page on DragonFly

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BIO_F_BASE64(3)		 BSD Library Functions Manual	       BIO_F_BASE64(3)

NAME
     BIO_f_base64 — base64 BIO filter

SYNOPSIS
     #include <openssl/bio.h>
     #include <openssl/evp.h>

     BIO_METHOD *
     BIO_f_base64(void);

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(3) or BIO_puts(3).

     BIO_flush(3) 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(3) to
     encode the data all on one line or expect the data to be all on one line.

NOTES
     Because of the format of base64 encoding the end of the encoded block
     cannot always be reliably determined.

RETURN VALUES
     BIO_f_base64() returns the base64 BIO method.

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);

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).

BSD				 July 17, 2014				   BSD
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