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NAME    [Toc]    [Back]

       BIO_f_base64 - base64 BIO filter

LIBRARY    [Toc]    [Back]

       libcrypto, -lcrypto

SYNOPSIS    [Toc]    [Back]

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

        BIO_METHOD *   BIO_f_base64(void);

DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

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

RETURN VALUES    [Toc]    [Back]

       BIO_f_base64() returns the base64 BIO method.

EXAMPLES    [Toc]    [Back]

       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));


       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;
        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);


BUGS    [Toc]    [Back]

       The ambiguity of EOF in base64 encoded data can cause
       additional data following the base64 encoded block to be

       There should be some way of specifying a test that the BIO
       can perform to reliably determine EOF (for example a MIME

SEE ALSO    [Toc]    [Back]


2001-04-12                    0.9.6g              BIO_f_base64(3)
[ Back ]
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