=pod =head1 NAME BIO_f_base64 - base64 BIO filter =head1 SYNOPSIS =for comment multiple includes #include #include const 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 COPYRIGHT Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut