blob: 1305c585ffe17b25887bc6ac5ff7bd0e9dc15187 [file] [log] [blame]
/* 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 <openssl/buf.h>
#include <string.h>
#include <openssl/mem.h>
#include <openssl/err.h>
#include "../internal.h"
BUF_MEM *BUF_MEM_new(void) {
BUF_MEM *ret;
ret = OPENSSL_malloc(sizeof(BUF_MEM));
if (ret == NULL) {
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return NULL;
}
OPENSSL_memset(ret, 0, sizeof(BUF_MEM));
return ret;
}
void BUF_MEM_free(BUF_MEM *buf) {
if (buf == NULL) {
return;
}
if (buf->data != NULL) {
OPENSSL_cleanse(buf->data, buf->max);
OPENSSL_free(buf->data);
}
OPENSSL_free(buf);
}
static int buf_mem_reserve(BUF_MEM *buf, size_t cap, int clean) {
if (buf->max >= cap) {
return 1;
}
size_t n = cap + 3;
if (n < cap) {
// overflow
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return 0;
}
n = n / 3;
size_t alloc_size = n * 4;
if (alloc_size / 4 != n) {
// overflow
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return 0;
}
char *new_buf;
if (buf->data == NULL) {
new_buf = OPENSSL_malloc(alloc_size);
} else {
if (clean) {
new_buf = OPENSSL_realloc_clean(buf->data, buf->max, alloc_size);
} else {
new_buf = OPENSSL_realloc(buf->data, alloc_size);
}
}
if (new_buf == NULL) {
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return 0;
}
buf->data = new_buf;
buf->max = alloc_size;
return 1;
}
int BUF_MEM_reserve(BUF_MEM *buf, size_t cap) {
return buf_mem_reserve(buf, cap, 0 /* don't clear old buffer contents. */);
}
static size_t buf_mem_grow(BUF_MEM *buf, size_t len, int clean) {
if (!buf_mem_reserve(buf, len, clean)) {
return 0;
}
if (buf->length < len) {
OPENSSL_memset(&buf->data[buf->length], 0, len - buf->length);
}
buf->length = len;
return len;
}
size_t BUF_MEM_grow(BUF_MEM *buf, size_t len) {
return buf_mem_grow(buf, len, 0 /* don't clear old buffer contents. */);
}
size_t BUF_MEM_grow_clean(BUF_MEM *buf, size_t len) {
return buf_mem_grow(buf, len, 1 /* clear old buffer contents. */);
}
char *BUF_strdup(const char *str) {
if (str == NULL) {
return NULL;
}
return BUF_strndup(str, strlen(str));
}
size_t BUF_strnlen(const char *str, size_t max_len) {
size_t i;
for (i = 0; i < max_len; i++) {
if (str[i] == 0) {
break;
}
}
return i;
}
char *BUF_strndup(const char *str, size_t size) {
char *ret;
size_t alloc_size;
if (str == NULL) {
return NULL;
}
size = BUF_strnlen(str, size);
alloc_size = size + 1;
if (alloc_size < size) {
// overflow
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret = OPENSSL_malloc(alloc_size);
if (ret == NULL) {
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return NULL;
}
OPENSSL_memcpy(ret, str, size);
ret[size] = '\0';
return ret;
}
size_t BUF_strlcpy(char *dst, const char *src, size_t dst_size) {
size_t l = 0;
for (; dst_size > 1 && *src; dst_size--) {
*dst++ = *src++;
l++;
}
if (dst_size) {
*dst = 0;
}
return l + strlen(src);
}
size_t BUF_strlcat(char *dst, const char *src, size_t dst_size) {
size_t l = 0;
for (; dst_size > 0 && *dst; dst_size--, dst++) {
l++;
}
return l + BUF_strlcpy(dst, src, dst_size);
}
void *BUF_memdup(const void *data, size_t size) {
if (size == 0) {
return NULL;
}
void *ret = OPENSSL_malloc(size);
if (ret == NULL) {
OPENSSL_PUT_ERROR(BUF, ERR_R_MALLOC_FAILURE);
return NULL;
}
OPENSSL_memcpy(ret, data, size);
return ret;
}