1BUF_MEM_NEW(3)                      OpenSSL                     BUF_MEM_NEW(3)
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NAME

6       BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow,
7       BUF_MEM_grow_clean, BUF_reverse - simple character array structure
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SYNOPSIS

10        #include <openssl/buffer.h>
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12        BUF_MEM *BUF_MEM_new(void);
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14        BUF_MEM *BUF_MEM_new_ex(unsigned long flags);
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16        void BUF_MEM_free(BUF_MEM *a);
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18        int BUF_MEM_grow(BUF_MEM *str, int len);
19        size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
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21        void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);
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DESCRIPTION

24       The buffer library handles simple character arrays. Buffers are used
25       for various purposes in the library, most notably memory BIOs.
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27       BUF_MEM_new() allocates a new buffer of zero size.
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29       BUF_MEM_new_ex() allocates a buffer with the specified flags.  The flag
30       BUF_MEM_FLAG_SECURE specifies that the data pointer should be allocated
31       on the secure heap; see CRYPTO_secure_malloc(3).
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33       BUF_MEM_free() frees up an already existing buffer. The data is zeroed
34       before freeing up in case the buffer contains sensitive data.
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36       BUF_MEM_grow() changes the size of an already existing buffer to len.
37       Any data already in the buffer is preserved if it increases in size.
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39       BUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any
40       free'd or additionally-allocated memory to zero.
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42       BUF_reverse() reverses size bytes at in into out.  If in is NULL, the
43       array is reversed in-place.
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RETURN VALUES

46       BUF_MEM_new() returns the buffer or NULL on error.
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48       BUF_MEM_free() has no return value.
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50       BUF_MEM_grow() and BUF_MEM_grow_clean() return zero on error or the new
51       size (i.e., len).
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SEE ALSO

54       bio(7), CRYPTO_secure_malloc(3).
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HISTORY

57       The BUF_MEM_new_ex() function was added in OpenSSL 1.1.0.
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60       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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62       Licensed under the OpenSSL license (the "License").  You may not use
63       this file except in compliance with the License.  You can obtain a copy
64       in the file LICENSE in the source distribution or at
65       <https://www.openssl.org/source/license.html>.
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691.1.1i                            2021-07-22                    BUF_MEM_NEW(3)
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