ext/hash/hash

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
PHP_CRC32Init
PHP_CRC32Update
PHP_CRC32BUpdate
PHP_CRC32Final
PHP_CRC32BFinal
PHP_CRC32Copy
   1 /*
   2   +----------------------------------------------------------------------+
   3   | PHP Version 7                                                        |
   4   +----------------------------------------------------------------------+
   5   | Copyright (c) 1997-2016 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 /* $Id$ */
  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  */
/* [<][>][^][v][top][bottom][index][help] */
root/ext/hash/hash_crc32.c

DEFINITIONS
