BIO_f_base64(3)BIO_f_base64(3)NAMEBIO_f_base64 - BIO filter for base64
SYNOPSIS
#include <openssl/bio.h> #include <openssl/evp.h>
BIO_METHOD * BIO_f_base64(
void );
DESCRIPTION
The BIO_f_base64() function 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 the BIO_gets() or BIO_puts() functions.
The BIO_flush() function 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 BIO_FLAGS_BASE64_NO_NL option 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.
RESTRICTIONS
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).
RETURN VALUES
The BIO_f_base64() function returns the base64 BIO method.
EXAMPLES
Base64 encode the string "Hello World\n" and write the result to stan‐
dard 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:
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);
SEE ALSO
TBA
BIO_f_base64(3)