1                 : /*
       2                 :   +----------------------------------------------------------------------+
       3                 :   | PHP Version 5                                                        |
       4                 :   +----------------------------------------------------------------------+
       5                 :   | Copyright (c) 1997-2007 The PHP Group                                |
       6                 :   +----------------------------------------------------------------------+
       7                 :   | This source file is subject to version 3.01 of the PHP license,      |
       8                 :   | that is bundled with this package in the file LICENSE, and is        |
       9                 :   | available through the world-wide-web at the following url:           |
      10                 :   | http://www.php.net/license/3_01.txt                                  |
      11                 :   | If you did not receive a copy of the PHP license and are unable to   |
      12                 :   | obtain it through the world-wide-web, please send a note to          |
      13                 :   | license@php.net so we can mail you a copy immediately.               |
      14                 :   +----------------------------------------------------------------------+
      15                 :   | Authors: Michael Wallner <mike@php.net>                              |
      16                 :   |          Sara Golemon <pollita@php.net>                              |
      17                 :   +----------------------------------------------------------------------+
      18                 : */
      19                 : 
      20                 : /* $Id: hash_crc32.c,v 1.2.2.3.2.2 2007/01/08 22:29:25 nlopess Exp $ */
      21                 : 
      22                 : #include "php_hash.h"
      23                 : #include "php_hash_crc32.h"
      24                 : #include "php_hash_crc32_tables.h"
      25                 : 
      26                 : PHP_HASH_API void PHP_CRC32Init(PHP_CRC32_CTX *context)
      27               2 : {
      28               2 :         context->state = ~0;
      29               2 : }
      30                 : 
      31                 : PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
      32               0 : {
      33                 :         size_t i;
      34                 :         
      35               0 :         for (i = 0; i < len; ++i) {
      36               0 :                 context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
      37                 :         }
      38               0 : }
      39                 : 
      40                 : PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
      41               2 : {
      42                 :         size_t i;
      43                 :         
      44              10 :         for (i = 0; i < len; ++i) {
      45               8 :                 context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
      46                 :         }
      47               2 : }
      48                 : 
      49                 : PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
      50               2 : {
      51               2 :         context->state=~context->state;
      52               2 :         digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
      53               2 :         digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
      54               2 :         digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
      55               2 :         digest[0] = (unsigned char) (context->state & 0xff);
      56               2 :         context->state = 0;
      57               2 : }
      58                 : 
      59                 : const php_hash_ops php_hash_crc32_ops = {
      60                 :         (php_hash_init_func_t) PHP_CRC32Init,
      61                 :         (php_hash_update_func_t) PHP_CRC32Update,
      62                 :         (php_hash_final_func_t) PHP_CRC32Final,
      63                 :         4, /* what to say here? */
      64                 :         4,
      65                 :         sizeof(PHP_CRC32_CTX)
      66                 : };
      67                 : 
      68                 : const php_hash_ops php_hash_crc32b_ops = {
      69                 :         (php_hash_init_func_t) PHP_CRC32Init,
      70                 :         (php_hash_update_func_t) PHP_CRC32BUpdate,
      71                 :         (php_hash_final_func_t) PHP_CRC32Final,
      72                 :         4, /* what to say here? */
      73                 :         4,
      74                 :         sizeof(PHP_CRC32_CTX)
      75                 : };
      76                 : 
      77                 : /*
      78                 :  * Local variables:
      79                 :  * tab-width: 4
      80                 :  * c-basic-offset: 4
      81                 :  * End:
      82                 :  * vim600: sw=4 ts=4 fdm=marker
      83                 :  * vim<600: sw=4 ts=4
      84                 :  */