Bumping manifests a=b2g-bump
[gecko.git] / mfbt / HashFunctions.cpp
blob3273e1788ea0f349548aaf14289a89c52ef9f408
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/. */
7 /* Implementations of hash functions. */
9 #include "mozilla/HashFunctions.h"
10 #include "mozilla/Types.h"
12 #include <string.h>
14 namespace mozilla {
16 uint32_t
17 HashBytes(const void* aBytes, size_t aLength)
19 uint32_t hash = 0;
20 const char* b = reinterpret_cast<const char*>(aBytes);
22 /* Walk word by word. */
23 size_t i = 0;
24 for (; i < aLength - (aLength % sizeof(size_t)); i += sizeof(size_t)) {
25 /* Do an explicitly unaligned load of the data. */
26 size_t data;
27 memcpy(&data, b + i, sizeof(size_t));
29 hash = AddToHash(hash, data, sizeof(data));
32 /* Get the remaining bytes. */
33 for (; i < aLength; i++) {
34 hash = AddToHash(hash, b[i]);
36 return hash;
39 } /* namespace mozilla */