1                 : /*
       2                 :   +----------------------------------------------------------------------+
       3                 :   | PHP Version 5                                                        |
       4                 :   +----------------------------------------------------------------------+
       5                 :   | Copyright (c) 1997-2009 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 272374 2008-12-31 11:17:49Z sebastian $ */
      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              21 : {
      28              21 :         context->state = ~0;
      29              21 : }
      30                 : 
      31                 : PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
      32              18 : {
      33                 :         size_t i;
      34                 :         
      35             518 :         for (i = 0; i < len; ++i) {
      36             500 :                 context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
      37                 :         }
      38              18 : }
      39                 : 
      40                 : PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
      41               7 : {
      42                 :         size_t i;
      43                 :         
      44             193 :         for (i = 0; i < len; ++i) {
      45             186 :                 context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
      46                 :         }
      47               7 : }
      48                 : 
      49                 : PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
      50              14 : {
      51              14 :         context->state=~context->state;
      52              14 :         digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
      53              14 :         digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
      54              14 :         digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
      55              14 :         digest[0] = (unsigned char) (context->state & 0xff);
      56              14 :         context->state = 0;
      57              14 : }
      58                 : 
      59                 : PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
      60               7 : {
      61               7 :         context->state=~context->state;
      62               7 :         digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
      63               7 :         digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
      64               7 :         digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
      65               7 :         digest[3] = (unsigned char) (context->state & 0xff);
      66               7 :         context->state = 0;
      67               7 : }
      68                 : 
      69                 : const php_hash_ops php_hash_crc32_ops = {
      70                 :         (php_hash_init_func_t) PHP_CRC32Init,
      71                 :         (php_hash_update_func_t) PHP_CRC32Update,
      72                 :         (php_hash_final_func_t) PHP_CRC32Final,
      73                 :         4, /* what to say here? */
      74                 :         4,
      75                 :         sizeof(PHP_CRC32_CTX)
      76                 : };
      77                 : 
      78                 : const php_hash_ops php_hash_crc32b_ops = {
      79                 :         (php_hash_init_func_t) PHP_CRC32Init,
      80                 :         (php_hash_update_func_t) PHP_CRC32BUpdate,
      81                 :         (php_hash_final_func_t) PHP_CRC32BFinal,
      82                 :         4, /* what to say here? */
      83                 :         4,
      84                 :         sizeof(PHP_CRC32_CTX)
      85                 : };
      86                 : 
      87                 : /*
      88                 :  * Local variables:
      89                 :  * tab-width: 4
      90                 :  * c-basic-offset: 4
      91                 :  * End:
      92                 :  * vim600: sw=4 ts=4 fdm=marker
      93                 :  * vim<600: sw=4 ts=4
      94                 :  */