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40 lines
1013 B
C++
40 lines
1013 B
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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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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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