Annotation of embedaddon/php/ext/hash/hash_joaat.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: | Author: Martin Jansen <mj@php.net> |
! 16: +----------------------------------------------------------------------+
! 17: */
! 18:
! 19: /* $Id$ */
! 20:
! 21: /* Implements Jenkins's one-at-a-time hashing algorithm as presented on
! 22: * http://www.burtleburtle.net/bob/hash/doobs.html.
! 23: */
! 24:
! 25: #include "php_hash.h"
! 26: #include "php_hash_joaat.h"
! 27:
! 28: const php_hash_ops php_hash_joaat_ops = {
! 29: (php_hash_init_func_t) PHP_JOAATInit,
! 30: (php_hash_update_func_t) PHP_JOAATUpdate,
! 31: (php_hash_final_func_t) PHP_JOAATFinal,
! 32: (php_hash_copy_func_t) php_hash_copy,
! 33: 4,
! 34: 4,
! 35: sizeof(PHP_JOAAT_CTX)
! 36: };
! 37:
! 38: PHP_HASH_API void PHP_JOAATInit(PHP_JOAAT_CTX *context)
! 39: {
! 40: context->state = 0;
! 41: }
! 42:
! 43: PHP_HASH_API void PHP_JOAATUpdate(PHP_JOAAT_CTX *context, const unsigned char *input, unsigned int inputLen)
! 44: {
! 45: context->state = joaat_buf((void *)input, inputLen, context->state);
! 46: }
! 47:
! 48: PHP_HASH_API void PHP_JOAATFinal(unsigned char digest[4], PHP_JOAAT_CTX * context)
! 49: {
! 50: #ifdef WORDS_BIGENDIAN
! 51: memcpy(digest, &context->state, 4);
! 52: #else
! 53: int i = 0;
! 54: unsigned char *c = (unsigned char *) &context->state;
! 55:
! 56: for (i = 0; i < 4; i++) {
! 57: digest[i] = c[3 - i];
! 58: }
! 59: #endif
! 60: context->state = 0;
! 61: }
! 62:
! 63: /*
! 64: * joaat_buf - perform a Jenkins's one-at-a-time hash on a buffer
! 65: *
! 66: * input:
! 67: * buf - start of buffer to hash
! 68: * len - length of buffer in octets
! 69: *
! 70: * returns:
! 71: * 32 bit hash as a static hash type
! 72: */
! 73: static php_hash_uint32
! 74: joaat_buf(void *buf, size_t len, php_hash_uint32 hval)
! 75: {
! 76: size_t i;
! 77: unsigned char *input = (unsigned char *)buf;
! 78:
! 79: for (i = 0; i < len; i++) {
! 80: hval += input[i];
! 81: hval += (hval << 10);
! 82: hval ^= (hval >> 6);
! 83: }
! 84:
! 85: hval += (hval << 3);
! 86: hval ^= (hval >> 11);
! 87: hval += (hval << 15);
! 88:
! 89: return hval;
! 90: }
! 91:
! 92: /*
! 93: * Local variables:
! 94: * tab-width: 4
! 95: * c-basic-offset: 4
! 96: * End:
! 97: * vim600: noet sw=4 ts=4 fdm=marker
! 98: * vim<600: noet sw=4 ts=4
! 99: */
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