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    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,v 1.1.1.1 2012/02/21 23:47:56 misho Exp $ */
   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:  */