BIO_F_READBUFFER(3ossl) OpenSSL BIO_F_READBUFFER(3ossl)
NAME
BIO_f_readbuffer - read only buffering BIO that supports BIO_tell() and
BIO_seek()
SYNOPSIS
#include <openssl/bio.h>
const BIO_METHOD *BIO_f_readbuffer(void);
DESCRIPTION
BIO_f_readbuffer(3) returns the read buffering BIO method.
This BIO filter can be inserted on top of BIO's that do not support
BIO_tell() or BIO_seek() (e.g. A file BIO that uses stdin).
Data read from a read buffering BIO comes from an internal buffer which
is filled from the next BIO in the chain.
BIO_gets() is supported for read buffering BIOs. Writing data to a
read buffering BIO is not supported.
Calling BIO_reset() on a read buffering BIO does not clear any buffered
data.
NOTES
Read buffering BIOs implement BIO_read_ex() by using BIO_read_ex()
operations on the next BIO (e.g. a file BIO) in the chain and storing
the result in an internal buffer, from which bytes are given back to
the caller as appropriate for the call. BIO_read_ex() is guaranteed to
give the caller the number of bytes it asks for, unless there's an
error or end of communication is reached in the next BIO. The internal
buffer can grow to cache the entire contents of the next BIO in the
chain. BIO_seek() uses the internal buffer, so that it can only seek
into data that is already read.
RETURN VALUES
BIO_f_readbuffer(3) returns the read buffering BIO method.
SEE ALSO
bio(7), BIO_read(3), BIO_gets(3), BIO_reset(3), BIO_ctrl(3).
COPYRIGHT
Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.
3.3.2 2024-09-04 BIO_F_READBUFFER(3ossl)
openssl 3.3.2 - Generated Fri Sep 6 16:26:02 CDT 2024