mfbt/HashFunctions.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Fri, 15 Jun 2012 18:52:50 +0900
changeset 99535 d3bed04319ab696f102d6ebe0399d5c7c55fdc3e
parent 98587 1a0f4431003105008d31616e75b8db2d3291d54f
child 99960 617cb36ead5971a182c09298ea2d457aeaf3fd9f
permissions -rw-r--r--
Bug 757688 part.6 Add numpad keys to printable key table and remove KeyboardLayout::IsNumpadKey() r=jimm

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Implementations of hash functions. */

#include "mozilla/HashFunctions.h"

#include <string.h>

namespace mozilla {

MFBT_API(uint32_t)
HashBytes(const void* bytes, size_t length)
{
  uint32_t hash = 0;
  const char* b = reinterpret_cast<const char*>(bytes);

  /* Walk word by word. */
  size_t i = 0;
  for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) {
    /* Do an explicitly unaligned load of the data. */
    size_t data;
    memcpy(&data, b + i, sizeof(size_t));

    hash = AddToHash(hash, data, sizeof(data));
  }

  /* Get the remaining bytes. */
  for (; i < length; i++)
    hash = AddToHash(hash, b[i]);

  return hash;
}

} /* namespace mozilla */