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