=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 standard C library equivalents =head1 SYNOPSIS #include 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 specifies that the B pointer should be allocated on the secure heap; see L. 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. 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 bytes at B into B. If B 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). =head1 SEE ALSO L, L. =head1 HISTORY BUF_MEM_new_ex() was added in OpenSSL 1.1.0. =head1 COPYRIGHT Copyright 2000-2016 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. =cut