1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4  * License, v. 2.0. If a copy of the MPL was not distributed with this
5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 
7 /* Implementations of hash functions. */
8 
9 #include "mozilla/HashFunctions.h"
10 #include "mozilla/Types.h"
11 
12 #include <string.h>
13 
14 namespace mozilla {
15 
HashBytes(const void * aBytes,size_t aLength)16 uint32_t HashBytes(const void* aBytes, size_t aLength) {
17   uint32_t hash = 0;
18   const char* b = reinterpret_cast<const char*>(aBytes);
19 
20   /* Walk word by word. */
21   size_t i = 0;
22   for (; i < aLength - (aLength % sizeof(size_t)); i += sizeof(size_t)) {
23     /* Do an explicitly unaligned load of the data. */
24     size_t data;
25     memcpy(&data, b + i, sizeof(size_t));
26 
27     hash = AddToHash(hash, data, sizeof(data));
28   }
29 
30   /* Get the remaining bytes. */
31   for (; i < aLength; i++) {
32     hash = AddToHash(hash, b[i]);
33   }
34   return hash;
35 }
36 
37 } /* namespace mozilla */
38