fd38836ba8
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/6538)
75 lines
2 KiB
Text
75 lines
2 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow,
|
|
BUF_MEM_grow_clean, BUF_reverse
|
|
- simple character array structure
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/buffer.h>
|
|
|
|
BUF_MEM *BUF_MEM_new(void);
|
|
|
|
BUF_MEM *BUF_MEM_new_ex(unsigned long flags);
|
|
|
|
void BUF_MEM_free(BUF_MEM *a);
|
|
|
|
int BUF_MEM_grow(BUF_MEM *str, int len);
|
|
size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
|
|
|
|
void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The buffer library handles simple character arrays. Buffers are used for
|
|
various purposes in the library, most notably memory BIOs.
|
|
|
|
BUF_MEM_new() allocates a new buffer of zero size.
|
|
|
|
BUF_MEM_new_ex() allocates a buffer with the specified flags.
|
|
The flag B<BUF_MEM_FLAG_SECURE> specifies that the B<data> pointer
|
|
should be allocated on the secure heap; see L<CRYPTO_secure_malloc(3)>.
|
|
|
|
BUF_MEM_free() frees up an already existing buffer. The data is zeroed
|
|
before freeing up in case the buffer contains sensitive data.
|
|
|
|
BUF_MEM_grow() changes the size of an already existing buffer to
|
|
B<len>. Any data already in the buffer is preserved if it increases in
|
|
size.
|
|
|
|
BUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any free'd
|
|
or additionally-allocated memory to zero.
|
|
|
|
BUF_reverse() reverses B<size> bytes at B<in> into B<out>. If B<in>
|
|
is NULL, the array is reversed in-place.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
BUF_MEM_new() returns the buffer or NULL on error.
|
|
|
|
BUF_MEM_free() has no return value.
|
|
|
|
BUF_MEM_grow() and BUF_MEM_grow_clean() return
|
|
zero on error or the new size (i.e., B<len>).
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<bio(7)>,
|
|
L<CRYPTO_secure_malloc(3)>.
|
|
|
|
=head1 HISTORY
|
|
|
|
BUF_MEM_new_ex() was added in OpenSSL 1.1.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2018 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
|