michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /* Implementations of hash functions. */
michael@0: 
michael@0: #include "mozilla/HashFunctions.h"
michael@0: #include "mozilla/Types.h"
michael@0: 
michael@0: #include <string.h>
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: uint32_t
michael@0: HashBytes(const void* bytes, size_t length)
michael@0: {
michael@0:   uint32_t hash = 0;
michael@0:   const char* b = reinterpret_cast<const char*>(bytes);
michael@0: 
michael@0:   /* Walk word by word. */
michael@0:   size_t i = 0;
michael@0:   for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) {
michael@0:     /* Do an explicitly unaligned load of the data. */
michael@0:     size_t data;
michael@0:     memcpy(&data, b + i, sizeof(size_t));
michael@0: 
michael@0:     hash = AddToHash(hash, data, sizeof(data));
michael@0:   }
michael@0: 
michael@0:   /* Get the remaining bytes. */
michael@0:   for (; i < length; i++)
michael@0:     hash = AddToHash(hash, b[i]);
michael@0: 
michael@0:   return hash;
michael@0: }
michael@0: 
michael@0: } /* namespace mozilla */