151 lines
4.7 KiB
C
Executable file
151 lines
4.7 KiB
C
Executable file
/* $OpenBSD: buffer.c,v 1.27 2017/05/02 03:59:44 deraadt Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/buffer.h>
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#include <openssl/err.h>
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/*
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* LIMIT_BEFORE_EXPANSION is the maximum n such that (n + 3) / 3 * 4 < 2**31.
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* That function is applied in several functions in this file and this limit
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* ensures that the result fits in an int.
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*/
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#define LIMIT_BEFORE_EXPANSION 0x5ffffffc
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BUF_MEM *
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BUF_MEM_new(void)
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{
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BUF_MEM *ret;
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if ((ret = calloc(1, sizeof(BUF_MEM))) == NULL) {
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BUFerror(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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return (ret);
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}
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void
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BUF_MEM_free(BUF_MEM *a)
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{
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if (a == NULL)
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return;
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freezero(a->data, a->max);
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free(a);
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}
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int
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BUF_MEM_grow(BUF_MEM *str, size_t len)
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{
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return BUF_MEM_grow_clean(str, len);
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}
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int
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BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
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{
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char *ret;
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size_t n;
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if (str->max >= len) {
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if (str->length >= len)
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memset(&str->data[len], 0, str->length - len);
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str->length = len;
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return (len);
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}
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if (len > LIMIT_BEFORE_EXPANSION) {
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BUFerror(ERR_R_MALLOC_FAILURE);
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return 0;
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}
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n = (len + 3) / 3 * 4;
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if ((ret = recallocarray(str->data, str->max, n, 1)) == NULL) {
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BUFerror(ERR_R_MALLOC_FAILURE);
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return (0);
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}
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str->data = ret;
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str->max = n;
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str->length = len;
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return (len);
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}
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void
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BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
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{
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size_t i;
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if (in) {
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out += size - 1;
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for (i = 0; i < size; i++)
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*out-- = *in++;
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} else {
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unsigned char *q;
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char c;
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q = out + size - 1;
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for (i = 0; i < size / 2; i++) {
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c = *q;
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*q-- = *out;
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*out++ = c;
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}
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}
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}
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