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BUF_reverse.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow, BUF_MEM_grow_clean, BUF_reverse \&\- simple character array structure .SH "SYNOPSIS" .IX 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 .SH "DESCRIPTION" .IX Header "DESCRIPTION" The buffer library handles simple character arrays. Buffers are used for various purposes in the library, most notably memory BIOs. .PP \&\fBBUF_MEM_new()\fR allocates a new buffer of zero size. .PP \&\fBBUF_MEM_new_ex()\fR allocates a buffer with the specified flags. The flag \fB\s-1BUF_MEM_FLAG_SECURE\s0\fR specifies that the \fBdata\fR pointer should be allocated on the secure heap; see \fBCRYPTO_secure_malloc\fR\|(3). .PP \&\fBBUF_MEM_free()\fR frees up an already existing buffer. The data is zeroed before freeing up in case the buffer contains sensitive data. .PP \&\fBBUF_MEM_grow()\fR changes the size of an already existing buffer to \&\fBlen\fR. Any data already in the buffer is preserved if it increases in size. .PP \&\fBBUF_MEM_grow_clean()\fR is similar to \fBBUF_MEM_grow()\fR but it sets any free'd or additionally-allocated memory to zero. .PP \&\fBBUF_reverse()\fR reverses \fBsize\fR bytes at \fBin\fR into \fBout\fR. If \fBin\fR is \s-1NULL,\s0 the array is reversed in-place. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBUF_MEM_new()\fR returns the buffer or \s-1NULL\s0 on error. .PP \&\fBBUF_MEM_free()\fR has no return value. .PP \&\fBBUF_MEM_grow()\fR and \fBBUF_MEM_grow_clean()\fR return zero on error or the new size (i.e., \fBlen\fR). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbio\fR\|(7), \&\fBCRYPTO_secure_malloc\fR\|(3). .SH "HISTORY" .IX Header "HISTORY" The \fBBUF_MEM_new_ex()\fR function was added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP 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>.
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