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BUF_MEM_NEW(3ossl) OpenSSL BUF_MEM_NEW(3ossl)
NAME
BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow,
BUF_MEM_grow_clean, BUF_reverse - simple character array structure
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);
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
BUF_MEM_FLAG_SECURE specifies that the data pointer should be allocated
on the secure heap; see 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 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 size bytes at in into out. If in is NULL, the
array is reversed in-place.
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., len).
SEE ALSO
bio(7), CRYPTO_secure_malloc(3).
HISTORY
The BUF_MEM_new_ex() function was added in OpenSSL 1.1.0.
COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.