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Title "BUF_MEM_NEW 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow, BUF_MEM_grow_clean, BUF_reverse \- simple character array structure Header "SYNOPSIS" .Vb 1 #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); .Ve Header "DESCRIPTION" The buffer library handles simple character arrays. Buffers are used for various purposes in the library, most notably memory BIOs.

\fBBUF_MEM_new() allocates a new buffer of zero size.

\fBBUF_MEM_new_ex() allocates a buffer with the specified flags. The flag \s-1BUF_MEM_FLAG_SECURE\s0 specifies that the data pointer should be allocated on the secure heap; see CRYPTO_secure_malloc\|(3).

\fBBUF_MEM_free() frees up an already existing buffer. The data is zeroed before freeing up in case the buffer contains sensitive data.

\fBBUF_MEM_grow() changes the size of an already existing buffer to \fBlen. Any data already in the buffer is preserved if it increases in size.

\fBBUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any free'd or additionally-allocated memory to zero.

\fBBUF_reverse() reverses size bytes at in into out. If in is \s-1NULL,\s0 the array is reversed in-place.

Header "RETURN VALUES" \fBBUF_MEM_new() returns the buffer or \s-1NULL\s0 on error.

\fBBUF_MEM_free() has no return value.

\fBBUF_MEM_grow() and BUF_MEM_grow_clean() return zero on error or the new size (i.e., len).

Header "SEE ALSO" \fBbio\|(7), \fBCRYPTO_secure_malloc\|(3). Header "HISTORY" The BUF_MEM_new_ex() function was added in OpenSSL 1.1.0. Header "COPYRIGHT" Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.