b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
77 lines
2 KiB
Text
77 lines
2 KiB
Text
=pod
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=head1 NAME
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BUF_MEM_new, BUF_MEM_new_ex, BUF_MEM_free, BUF_MEM_grow
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BUF_MEM_grow_clean, BUF_reverse
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- simple character array structure
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standard C library equivalents
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=head1 SYNOPSIS
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#include <openssl/buffer.h>
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BUF_MEM *BUF_MEM_new(void);
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BUF_MEM *BUF_MEM_new_ex(unsigned long flags);
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void BUF_MEM_free(BUF_MEM *a);
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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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void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size);
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=head1 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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BUF_MEM_new() allocates a new buffer of zero size.
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BUF_MEM_new_ex() allocates a buffer with the specified flags.
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The flag B<BUF_MEM_FLAG_SECURE> specifies that the B<data> pointer
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should be allocated on the secure heap; see L<CRYPTO_secure_malloc(3)>.
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BUF_MEM_free() 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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BUF_MEM_grow() changes the size of an already existing buffer to
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B<len>. Any data already in the buffer is preserved if it increases in
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size.
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BUF_MEM_grow_clean() is similar to BUF_MEM_grow() but it sets any free'd
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or additionally-allocated memory to zero.
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BUF_reverse() reverses B<size> bytes at B<in> into B<out>. If B<out>
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is NULL, the array is reversed in-place.
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=head1 RETURN VALUES
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BUF_MEM_new() returns the buffer or NULL on error.
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BUF_MEM_free() has no return value.
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BUF_MEM_grow() and BUF_MEM_grow_clean() return
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zero on error or the new size (i.e., B<len>).
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=head1 SEE ALSO
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L<bio(7)>,
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L<CRYPTO_secure_malloc(3)>.
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=head1 HISTORY
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BUF_MEM_new_ex() was added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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