1=pod 2 3=head1 NAME 4 5BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow, 6BUF_MEM_grow_clean, BUF_reverse 7- simple character array structure 8 9=head1 SYNOPSIS 10 11 #include <openssl/buffer.h> 12 13 BUF_MEM *BUF_MEM_new(void); 14 15 BUF_MEM *BUF_MEM_new_ex(unsigned long flags); 16 17 void BUF_MEM_free(BUF_MEM *a); 18 19 int BUF_MEM_grow(BUF_MEM *str, int len); 20 size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len); 21 22 void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size); 23 24=head1 DESCRIPTION 25 26The buffer library handles simple character arrays. Buffers are used for 27various purposes in the library, most notably memory BIOs. 28 29BUF_MEM_new() allocates a new buffer of zero size. 30 31BUF_MEM_new_ex() allocates a buffer with the specified flags. 32The flag B<BUF_MEM_FLAG_SECURE> specifies that the B<data> pointer 33should be allocated on the secure heap; see L<CRYPTO_secure_malloc(3)>. 34 35BUF_MEM_free() frees up an already existing buffer. The data is zeroed 36before freeing up in case the buffer contains sensitive data. 37 38BUF_MEM_grow() changes the size of an already existing buffer to 39B<len>. Any data already in the buffer is preserved if it increases in 40size. 41 42BUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any free'd 43or additionally-allocated memory to zero. 44 45BUF_reverse() reverses B<size> bytes at B<in> into B<out>. If B<in> 46is NULL, the array is reversed in-place. 47 48=head1 RETURN VALUES 49 50BUF_MEM_new() returns the buffer or NULL on error. 51 52BUF_MEM_free() has no return value. 53 54BUF_MEM_grow() and BUF_MEM_grow_clean() return 55zero on error or the new size (i.e., B<len>). 56 57=head1 SEE ALSO 58 59L<bio(7)>, 60L<CRYPTO_secure_malloc(3)>. 61 62=head1 HISTORY 63 64The BUF_MEM_new_ex() function was added in OpenSSL 1.1.0. 65 66=head1 COPYRIGHT 67 68Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. 69 70Licensed under the OpenSSL license (the "License"). You may not use 71this file except in compliance with the License. You can obtain a copy 72in the file LICENSE in the source distribution or at 73L<https://www.openssl.org/source/license.html>. 74 75=cut 76