forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
205 lines
6.2 KiB
Groff
205 lines
6.2 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BUF_MEM_NEW 3"
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.TH BUF_MEM_NEW 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow, BUF_MEM_grow_clean, BUF_reverse \&\- simple character array structure
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/buffer.h>
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\&
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\& BUF_MEM *BUF_MEM_new(void);
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\&
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\& BUF_MEM *BUF_MEM_new_ex(unsigned long flags);
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\&
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\& void BUF_MEM_free(BUF_MEM *a);
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\&
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\& int BUF_MEM_grow(BUF_MEM *str, int len);
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\& size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
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\&
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\& void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The buffer library handles simple character arrays. Buffers are used for
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various purposes in the library, most notably memory BIOs.
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.PP
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\&\fBBUF_MEM_new()\fR allocates a new buffer of zero size.
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.PP
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\&\fBBUF_MEM_new_ex()\fR allocates a buffer with the specified flags.
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The flag \fB\s-1BUF_MEM_FLAG_SECURE\s0\fR specifies that the \fBdata\fR pointer
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should be allocated on the secure heap; see \fBCRYPTO_secure_malloc\fR\|(3).
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.PP
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\&\fBBUF_MEM_free()\fR frees up an already existing buffer. The data is zeroed
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before freeing up in case the buffer contains sensitive data.
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.PP
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\&\fBBUF_MEM_grow()\fR changes the size of an already existing buffer to
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\&\fBlen\fR. Any data already in the buffer is preserved if it increases in
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size.
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.PP
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\&\fBBUF_MEM_grow_clean()\fR is similar to \fBBUF_MEM_grow()\fR but it sets any free'd
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or additionally-allocated memory to zero.
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.PP
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\&\fBBUF_reverse()\fR reverses \fBsize\fR bytes at \fBin\fR into \fBout\fR. If \fBin\fR
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is \s-1NULL,\s0 the array is reversed in-place.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBBUF_MEM_new()\fR returns the buffer or \s-1NULL\s0 on error.
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.PP
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\&\fBBUF_MEM_free()\fR has no return value.
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.PP
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\&\fBBUF_MEM_grow()\fR and \fBBUF_MEM_grow_clean()\fR return
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zero on error or the new size (i.e., \fBlen\fR).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBbio\fR\|(7),
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\&\fBCRYPTO_secure_malloc\fR\|(3).
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fBBUF_MEM_new_ex()\fR function was added in OpenSSL 1.1.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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