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Annotation of embedaddon/php/ext/hash/hash_crc32.c, revision 1.1.1.3

1.1       misho       1: /*
                      2:   +----------------------------------------------------------------------+
                      3:   | PHP Version 5                                                        |
                      4:   +----------------------------------------------------------------------+
1.1.1.3 ! misho       5:   | Copyright (c) 1997-2013 The PHP Group                                |
1.1       misho       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: 
1.1.1.2   misho      20: /* $Id$ */
1.1       misho      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: {
                     28:        context->state = ~0;
                     29: }
                     30: 
                     31: PHP_HASH_API void PHP_CRC32Update(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
                     32: {
                     33:        size_t i;
                     34:        
                     35:        for (i = 0; i < len; ++i) {
                     36:                context->state = (context->state << 8) ^ crc32_table[(context->state >> 24) ^ (input[i] & 0xff)];
                     37:        }
                     38: }
                     39: 
                     40: PHP_HASH_API void PHP_CRC32BUpdate(PHP_CRC32_CTX *context, const unsigned char *input, size_t len)
                     41: {
                     42:        size_t i;
                     43:        
                     44:        for (i = 0; i < len; ++i) {
                     45:                context->state = (context->state >> 8) ^ crc32b_table[(context->state ^ input[i]) & 0xff];
                     46:        }
                     47: }
                     48: 
                     49: PHP_HASH_API void PHP_CRC32Final(unsigned char digest[4], PHP_CRC32_CTX *context)
                     50: {
                     51:        context->state=~context->state;
                     52:        digest[3] = (unsigned char) ((context->state >> 24) & 0xff);
                     53:        digest[2] = (unsigned char) ((context->state >> 16) & 0xff);
                     54:        digest[1] = (unsigned char) ((context->state >> 8) & 0xff);
                     55:        digest[0] = (unsigned char) (context->state & 0xff);
                     56:        context->state = 0;
                     57: }
                     58: 
                     59: PHP_HASH_API void PHP_CRC32BFinal(unsigned char digest[4], PHP_CRC32_CTX *context)
                     60: {
                     61:        context->state=~context->state;
                     62:        digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
                     63:        digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
                     64:        digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
                     65:        digest[3] = (unsigned char) (context->state & 0xff);
                     66:        context->state = 0;
                     67: }
                     68: 
                     69: PHP_HASH_API int PHP_CRC32Copy(const php_hash_ops *ops, PHP_CRC32_CTX *orig_context, PHP_CRC32_CTX *copy_context)
                     70: {
                     71:        copy_context->state = orig_context->state;
                     72:        return SUCCESS;
                     73: }
                     74: 
                     75: const php_hash_ops php_hash_crc32_ops = {
                     76:        (php_hash_init_func_t) PHP_CRC32Init,
                     77:        (php_hash_update_func_t) PHP_CRC32Update,
                     78:        (php_hash_final_func_t) PHP_CRC32Final,
                     79:        (php_hash_copy_func_t) PHP_CRC32Copy,
                     80:        4, /* what to say here? */
                     81:        4,
                     82:        sizeof(PHP_CRC32_CTX)
                     83: };
                     84: 
                     85: const php_hash_ops php_hash_crc32b_ops = {
                     86:        (php_hash_init_func_t) PHP_CRC32Init,
                     87:        (php_hash_update_func_t) PHP_CRC32BUpdate,
                     88:        (php_hash_final_func_t) PHP_CRC32BFinal,
                     89:        (php_hash_copy_func_t) PHP_CRC32Copy,
                     90:        4, /* what to say here? */
                     91:        4,
                     92:        sizeof(PHP_CRC32_CTX)
                     93: };
                     94: 
                     95: /*
                     96:  * Local variables:
                     97:  * tab-width: 4
                     98:  * c-basic-offset: 4
                     99:  * End:
                    100:  * vim600: sw=4 ts=4 fdm=marker
                    101:  * vim<600: sw=4 ts=4
                    102:  */