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73 lines
2.5 KiB
C++
73 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99 ft=cpp:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Justin Lebar <justin.lebar@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* Implementations of hash functions */
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#include "mozilla/HashFunctions.h"
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#include <string.h>
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namespace mozilla {
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MFBT_API(uint32_t)
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HashBytes(const void* bytes, size_t length)
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{
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uint32_t hash = 0;
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const char* b = reinterpret_cast<const char*>(bytes);
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/* Walk word by word. */
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size_t i = 0;
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for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) {
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/* Do an explicitly unaligned load of the data. */
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size_t data;
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memcpy(&data, b + i, sizeof(size_t));
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hash = AddToHash(hash, data, sizeof(data));
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}
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/* Get the remaining bytes. */
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for (; i < length; i++) {
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hash = AddToHash(hash, b[i]);
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}
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return hash;
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}
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} /* namespace mozilla */
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