BIO_f_base64(3)

     BIO_f_base64(3)        0.9.6h (2000-09-14)        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() 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.

     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 = BIO_push(b64, bio);
           BIO_write(bio, message, strlen(message));
           BIO_flush(bio);

           BIO_free_all(bio);

          Read Base64 encoded data from standard input and write the
          decoded data to standard output:

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     BIO_f_base64(3)        0.9.6h (2000-09-14)        BIO_f_base64(3)

           BIO *bio, *b64, bio_out;
           char inbuf[512];
           int inlen;
           char message[] = "Hello World \n";

           b64 = BIO_new(BIO_f_base64());
           bio = BIO_new_fp(stdin, BIO_NOCLOSE);
           bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
           bio = BIO_push(b64, bio);
           while((inlen = BIO_read(bio, inbuf, strlen(message))) > 0)
                  BIO_write(bio_out, inbuf, inlen);

           BIO_free_all(bio);

     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).

     SEE ALSO
          TBA

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