91da5e7710
Function-like macros are replaced with prototypes and a note that they are implemented as macros. Constants are just referenced in-line in the text. Tweak BIO_TYPE_... documentation. Also fix RT4592. Reviewed-by: Matt Caswell <matt@openssl.org>
92 lines
2.9 KiB
Text
92 lines
2.9 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BIO_get_buffer_num_lines,
|
|
BIO_set_read_buffer_size,
|
|
BIO_set_write_buffer_size,
|
|
BIO_set_buffer_size,
|
|
BIO_set_buffer_read_data,
|
|
BIO_f_buffer
|
|
- buffering BIO
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/bio.h>
|
|
|
|
const BIO_METHOD *BIO_f_buffer(void);
|
|
|
|
long BIO_get_buffer_num_lines(BIO *b);
|
|
long BIO_set_read_buffer_size(BIO *b, long size);
|
|
long BIO_set_write_buffer_size(BIO *b, long size);
|
|
long BIO_set_buffer_size(BIO *b, long size);
|
|
long BIO_set_buffer_read_data(BIO *b, void *buf, long num);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
BIO_f_buffer() returns the buffering BIO method.
|
|
|
|
Data written to a buffering BIO is buffered and periodically written
|
|
to the next BIO in the chain. Data read from a buffering BIO comes from
|
|
an internal buffer which is filled from the next BIO in the chain.
|
|
Both BIO_gets() and BIO_puts() are supported.
|
|
|
|
Calling BIO_reset() on a buffering BIO clears any buffered data.
|
|
|
|
BIO_get_buffer_num_lines() returns the number of lines currently buffered.
|
|
|
|
BIO_set_read_buffer_size(), BIO_set_write_buffer_size() and BIO_set_buffer_size()
|
|
set the read, write or both read and write buffer sizes to B<size>. The initial
|
|
buffer size is DEFAULT_BUFFER_SIZE, currently 4096. Any attempt to reduce the
|
|
buffer size below DEFAULT_BUFFER_SIZE is ignored. Any buffered data is cleared
|
|
when the buffer is resized.
|
|
|
|
BIO_set_buffer_read_data() clears the read buffer and fills it with B<num>
|
|
bytes of B<buf>. If B<num> is larger than the current buffer size the buffer
|
|
is expanded.
|
|
|
|
=head1 NOTES
|
|
|
|
These functions, other than BIO_f_buffer(), are implemented as macros.
|
|
|
|
Buffering BIOs implement BIO_gets() by using BIO_read() operations on the
|
|
next BIO in the chain. By prepending a buffering BIO to a chain it is therefore
|
|
possible to provide BIO_gets() functionality if the following BIOs do not
|
|
support it (for example SSL BIOs).
|
|
|
|
Data is only written to the next BIO in the chain when the write buffer fills
|
|
or when BIO_flush() is called. It is therefore important to call BIO_flush()
|
|
whenever any pending data should be written such as when removing a buffering
|
|
BIO using BIO_pop(). BIO_flush() may need to be retried if the ultimate
|
|
source/sink BIO is non blocking.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
BIO_f_buffer() returns the buffering BIO method.
|
|
|
|
BIO_get_buffer_num_lines() returns the number of lines buffered (may be 0).
|
|
|
|
BIO_set_read_buffer_size(), BIO_set_write_buffer_size() and BIO_set_buffer_size()
|
|
return 1 if the buffer was successfully resized or 0 for failure.
|
|
|
|
BIO_set_buffer_read_data() returns 1 if the data was set correctly or 0 if
|
|
there was an error.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<BIO(3)>,
|
|
L<BIO_reset(3)>,
|
|
L<BIO_flush(3)>,
|
|
L<BIO_pop(3)>,
|
|
L<BIO_ctrl(3)>.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|