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Annotation of embedaddon/php/ext/hash/hash_adler32.c, revision 1.1

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: 
        !            20: /* $Id: hash_adler32.c 321634 2012-01-01 13:15:04Z felipe $ */
        !            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) {
        !            37:                s[0] = (s[0] + input[i]) % 65521;
        !            38:                s[1] = (s[1] + s[0]) % 65521;
        !            39:        }
        !            40:        context->state = s[0] + (s[1] << 16);
        !            41: }
        !            42: 
        !            43: PHP_HASH_API void PHP_ADLER32Final(unsigned char digest[4], PHP_ADLER32_CTX *context)
        !            44: {
        !            45:        digest[0] = (unsigned char) ((context->state >> 24) & 0xff);
        !            46:        digest[1] = (unsigned char) ((context->state >> 16) & 0xff);
        !            47:        digest[2] = (unsigned char) ((context->state >> 8) & 0xff);
        !            48:        digest[3] = (unsigned char) (context->state & 0xff);
        !            49:        context->state = 0;
        !            50: }
        !            51: 
        !            52: PHP_HASH_API int PHP_ADLER32Copy(const php_hash_ops *ops, PHP_ADLER32_CTX *orig_context, PHP_ADLER32_CTX *copy_context)
        !            53: {
        !            54:        copy_context->state = orig_context->state;
        !            55:        return SUCCESS;
        !            56: }
        !            57: 
        !            58: const php_hash_ops php_hash_adler32_ops = {
        !            59:        (php_hash_init_func_t) PHP_ADLER32Init,
        !            60:        (php_hash_update_func_t) PHP_ADLER32Update,
        !            61:        (php_hash_final_func_t) PHP_ADLER32Final,
        !            62:        (php_hash_copy_func_t) PHP_ADLER32Copy,
        !            63:        4, /* what to say here? */
        !            64:        4,
        !            65:        sizeof(PHP_ADLER32_CTX)
        !            66: };
        !            67: 
        !            68: /*
        !            69:  * Local variables:
        !            70:  * tab-width: 4
        !            71:  * c-basic-offset: 4
        !            72:  * End:
        !            73:  * vim600: sw=4 ts=4 fdm=marker
        !            74:  * vim<600: sw=4 ts=4
        !            75:  */