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|
/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2011 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Michael Wallner <mike@php.net> |
| Sara Golemon <pollita@php.net> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php_hash.h"
#include "php_hash_crc32.h"
#include "php_hash_crc32_tables.h"
PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context)
{
context->state = ~0;
}
PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
{
size_t i;
for (i = 0; i < len; ++i) {
context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
}
}
PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
{
size_t i;
for (i = 0; i < len; ++i) {
context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
}
}
PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
{
context->state=~context->state;
digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
digest[0] = (unsigned char) (context->state & 0xff);
context->state = 0;
}
PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
{
context->state=~context->state;
digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
digest[3] = (unsigned char) (context->state & 0xff);
context->state = 0;
}
PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
{
copy_context->state = orig_context->state;
return SUCCESS;
}
const php_hash_ops php_hash_crc32_ops = {
(php_hash_init_func_t) PHP_CRC32Init,
(php_hash_update_func_t) PHP_CRC32Update,
(php_hash_final_func_t) PHP_CRC32Final,
(php_hash_copy_func_t) PHP_CRC32Copy,
4, /* what to say here? */
4,
sizeof(PHP_CRC32_CTX)
};
const php_hash_ops php_hash_crc32b_ops = {
(php_hash_init_func_t) PHP_CRC32Init,
(php_hash_update_func_t) PHP_CRC32BUpdate,
(php_hash_final_func_t) PHP_CRC32BFinal,
(php_hash_copy_func_t) PHP_CRC32Copy,
4, /* what to say here? */
4,
sizeof(PHP_CRC32_CTX)
};
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
|
