6 BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow
7 BUF_MEM_grow_clean, BUF_reverse
8 - simple character array structure
10 standard C library equivalents
14 #include <openssl/buffer.h>
16 BUF_MEM *BUF_MEM_new(void);
18 #define BUF_MEM_FLAG_SECURE
20 BUF_MEM *BUF_MEM_new_ex(unsigned long flags);
22 void BUF_MEM_free(BUF_MEM *a);
24 int BUF_MEM_grow(BUF_MEM *str, int len);
25 size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
27 void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);
31 The buffer library handles simple character arrays. Buffers are used for
32 various purposes in the library, most notably memory BIOs.
34 BUF_MEM_new() allocates a new buffer of zero size.
36 BUF_MEM_new_ex() allocates a buffer with the specified flags.
37 The flag B<BUF_MEM_FLAG_SECURE> specifies that the B<data> pointer
38 should be allocated on the secure heap; see L<CRYPTO_secure_malloc(3)>.
40 BUF_MEM_free() frees up an already existing buffer. The data is zeroed
41 before freeing up in case the buffer contains sensitive data.
43 BUF_MEM_grow() changes the size of an already existing buffer to
44 B<len>. Any data already in the buffer is preserved if it increases in
47 BUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any free'd
48 or additionally-allocated memory to zero.
50 BUF_reverse() reverses B<size> bytes at B<in> into B<out>. If B<out>
51 is NULL, the array is reversed in-place.
55 BUF_MEM_new() returns the buffer or NULL on error.
57 BUF_MEM_free() has no return value.
59 BUF_MEM_grow() and BUF_MEM_grow_clean() return
60 zero on error or the new size (i.e., B<len>).
65 L<CRYPTO_secure_malloc(3)>.
69 BUF_MEM_new_ex() was added in OpenSSL 1.1.0.
73 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
75 Licensed under the OpenSSL license (the "License"). You may not use
76 this file except in compliance with the License. You can obtain a copy
77 in the file LICENSE in the source distribution or at
78 L<https://www.openssl.org/source/license.html>.