mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
82 lines
1.9 KiB
Plaintext
82 lines
1.9 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BIO_f_base64 - base64 BIO filter
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/bio.h>
|
|
#include <openssl/evp.h>
|
|
|
|
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 = 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;
|
|
|
|
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, 512)) > 0)
|
|
BIO_write(bio_out, inbuf, inlen);
|
|
|
|
BIO_free_all(bio);
|
|
|
|
=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 SEE ALSO
|
|
|
|
TBA
|