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Annotation of embedaddon/php/ext/hash/hash_adler32.c, revision 1.1.1.2

1.1       misho       1: /*
                      2:   +----------------------------------------------------------------------+
                      3:   | PHP Version 5                                                        |
                      4:   +----------------------------------------------------------------------+
                      5:   | Copyright (c) 1997-2012 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: 
1.1.1.2 ! misho      20: /* $Id$ */
1.1       misho      21: 
                     22: #include "php_hash.h"
                     23: #include "php_hash_adler32.h"
                     24: 
                     25: PHP_HASH_API void PHP_ADLER32Init(PHP_ADLER32_CTX *context)
                     26: {
                     27:        context->state = 1;
                     28: }
                     29: 
                     30: PHP_HASH_API void PHP_ADLER32Update(PHP_ADLER32_CTX *context, const unsigned char *input, size_t len)
                     31: {
                     32:        php_hash_uint32 i, s[2];
                     33:        
                     34:        s[0] = context->state & 0xffff;
                     35:        s[1] = (context->state >> 16) & 0xffff;
                     36:        for (i = 0; i < len; ++i) {
1.1.1.2 ! misho      37:                s[0] += input[i];
        !            38:                s[1] += s[0];
        !            39:                if (s[1]>=0x7fffffff)
        !            40:                {
        !            41:                        s[0] = s[0] % 65521;
        !            42:                        s[1] = s[1] % 65521;
        !            43:                }
1.1       misho      44:        }
1.1.1.2 ! misho      45:        s[0] = s[0] % 65521;
        !            46:        s[1] = s[1] % 65521;
1.1       misho      47:        context->state = s[0] + (s[1] << 16);
                     48: }
                     49: 
                     50: PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
                     51: {
                     52:        digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
                     53:        digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
                     54:        digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
                     55:        digest[3] = (unsigned char) (context->state & 0xff);
                     56:        context->state = 0;
                     57: }
                     58: 
                     59: PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
                     60: {
                     61:        copy_context->state = orig_context->state;
                     62:        return SUCCESS;
                     63: }
                     64: 
                     65: const php_hash_ops php_hash_adler32_ops = {
                     66:        (php_hash_init_func_t) PHP_ADLER32Init,
                     67:        (php_hash_update_func_t) PHP_ADLER32Update,
                     68:        (php_hash_final_func_t) PHP_ADLER32Final,
                     69:        (php_hash_copy_func_t) PHP_ADLER32Copy,
                     70:        4, /* what to say here? */
                     71:        4,
                     72:        sizeof(PHP_ADLER32_CTX)
                     73: };
                     74: 
                     75: /*
                     76:  * Local variables:
                     77:  * tab-width: 4
                     78:  * c-basic-offset: 4
                     79:  * End:
                     80:  * vim600: sw=4 ts=4 fdm=marker
                     81:  * vim<600: sw=4 ts=4
                     82:  */