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-rw-r--r--thirdparty/openssl/crypto/buffer/buffer.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/thirdparty/openssl/crypto/buffer/buffer.c b/thirdparty/openssl/crypto/buffer/buffer.c
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+/* crypto/buffer/buffer.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * All rights reserved.
+ *
+ * This package is an SSL implementation written
+ * by Eric Young (eay@cryptsoft.com).
+ * The implementation was written so as to conform with Netscapes SSL.
+ *
+ * This library is free for commercial and non-commercial use as long as
+ * the following conditions are aheared to. The following conditions
+ * apply to all code found in this distribution, be it the RC4, RSA,
+ * lhash, DES, etc., code; not just the SSL code. The SSL documentation
+ * included with this distribution is covered by the same copyright terms
+ * except that the holder is Tim Hudson (tjh@cryptsoft.com).
+ *
+ * Copyright remains Eric Young's, and as such any Copyright notices in
+ * the code are not to be removed.
+ * If this package is used in a product, Eric Young should be given attribution
+ * as the author of the parts of the library used.
+ * This can be in the form of a textual message at program startup or
+ * in documentation (online or textual) provided with the package.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * "This product includes cryptographic software written by
+ * Eric Young (eay@cryptsoft.com)"
+ * The word 'cryptographic' can be left out if the rouines from the library
+ * being used are not cryptographic related :-).
+ * 4. If you include any Windows specific code (or a derivative thereof) from
+ * the apps directory (application code) you must include an acknowledgement:
+ * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * The licence and distribution terms for any publically available version or
+ * derivative of this code cannot be changed. i.e. this code cannot simply be
+ * copied and put under another distribution licence
+ * [including the GNU Public Licence.]
+ */
+
+#include <stdio.h>
+#include "cryptlib.h"
+#include <openssl/buffer.h>
+
+/*
+ * LIMIT_BEFORE_EXPANSION is the maximum n such that (n+3)/3*4 < 2**31. That
+ * function is applied in several functions in this file and this limit
+ * ensures that the result fits in an int.
+ */
+#define LIMIT_BEFORE_EXPANSION 0x5ffffffc
+
+BUF_MEM *BUF_MEM_new(void)
+{
+ BUF_MEM *ret;
+
+ ret = OPENSSL_malloc(sizeof(BUF_MEM));
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_NEW, ERR_R_MALLOC_FAILURE);
+ return (NULL);
+ }
+ ret->length = 0;
+ ret->max = 0;
+ ret->data = NULL;
+ return (ret);
+}
+
+void BUF_MEM_free(BUF_MEM *a)
+{
+ if (a == NULL)
+ return;
+
+ if (a->data != NULL) {
+ OPENSSL_cleanse(a->data, a->max);
+ OPENSSL_free(a->data);
+ }
+ OPENSSL_free(a);
+}
+
+int BUF_MEM_grow(BUF_MEM *str, size_t len)
+{
+ char *ret;
+ size_t n;
+
+ if (str->length >= len) {
+ str->length = len;
+ return (len);
+ }
+ if (str->max >= len) {
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ return (len);
+ }
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION) {
+ BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ n = (len + 3) / 3 * 4;
+ if (str->data == NULL)
+ ret = OPENSSL_malloc(n);
+ else
+ ret = OPENSSL_realloc(str->data, n);
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_GROW, ERR_R_MALLOC_FAILURE);
+ len = 0;
+ } else {
+ str->data = ret;
+ str->max = n;
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ }
+ return (len);
+}
+
+int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
+{
+ char *ret;
+ size_t n;
+
+ if (str->length >= len) {
+ memset(&str->data[len], 0, str->length - len);
+ str->length = len;
+ return (len);
+ }
+ if (str->max >= len) {
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ return (len);
+ }
+ /* This limit is sufficient to ensure (len+3)/3*4 < 2**31 */
+ if (len > LIMIT_BEFORE_EXPANSION) {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ n = (len + 3) / 3 * 4;
+ if (str->data == NULL)
+ ret = OPENSSL_malloc(n);
+ else
+ ret = OPENSSL_realloc_clean(str->data, str->max, n);
+ if (ret == NULL) {
+ BUFerr(BUF_F_BUF_MEM_GROW_CLEAN, ERR_R_MALLOC_FAILURE);
+ len = 0;
+ } else {
+ str->data = ret;
+ str->max = n;
+ memset(&str->data[str->length], 0, len - str->length);
+ str->length = len;
+ }
+ return (len);
+}
+
+void BUF_reverse(unsigned char *out, const unsigned char *in, size_t size)
+{
+ size_t i;
+ if (in) {
+ out += size - 1;
+ for (i = 0; i < size; i++)
+ *out-- = *in++;
+ } else {
+ unsigned char *q;
+ char c;
+ q = out + size - 1;
+ for (i = 0; i < size / 2; i++) {
+ c = *q;
+ *q-- = *out;
+ *out++ = c;
+ }
+ }
+}
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