LCOV - app.info - mfbt/HashFunctions.cpp

LCOV - code coverage report
| Current view: | directory - mfbt - HashFunctions.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 10 | 0 | 0.0 %
| Date: | 2012-04-07 | Functions: | 1 | 0 | 0.0 %

           1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  * vim: set ts=8 sw=4 et tw=99 ft=cpp:
           3                 :  *
           4                 :  * ***** BEGIN LICENSE BLOCK *****
           5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           6                 :  *
           7                 :  * The contents of this file are subject to the Mozilla Public License Version
           8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           9                 :  * the License. You may obtain a copy of the License at:
          10                 :  * http://www.mozilla.org/MPL/
          11                 :  *
          12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          14                 :  * for the specific language governing rights and limitations under the
          15                 :  * License.
          16                 :  *
          17                 :  * The Original Code is Mozilla Code.
          18                 :  *
          19                 :  * The Initial Developer of the Original Code is
          20                 :  *   The Mozilla Foundation
          21                 :  * Portions created by the Initial Developer are Copyright (C) 2011
          22                 :  * the Initial Developer. All Rights Reserved.
          23                 :  *
          24                 :  * Contributor(s):
          25                 :  *   Justin Lebar <justin.lebar@gmail.com>
          26                 :  *
          27                 :  * Alternatively, the contents of this file may be used under the terms of
          28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          31                 :  * of those above. If you wish to allow use of your version of this file only
          32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          33                 :  * use your version of this file under the terms of the MPL, indicate your
          34                 :  * decision by deleting the provisions above and replace them with the notice
          35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          36                 :  * the provisions above, a recipient may use your version of this file under
          37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          38                 :  *
          39                 :  * ***** END LICENSE BLOCK ***** */
          40                 :
          41                 : /* Implementations of hash functions */
          42                 :
          43                 : #include "mozilla/HashFunctions.h"
          44                 : #include <string.h>
          45                 :
          46                 : namespace mozilla {
          47                 :
          48                 : MFBT_API(uint32_t)
          49               0 : HashBytes(const void* bytes, size_t length)
          50                 : {
          51               0 :   uint32_t hash = 0;
          52               0 :   const char* b = reinterpret_cast<const char*>(bytes);
          53                 :
          54                 :   /* Walk word by word. */
          55               0 :   size_t i = 0;
          56               0 :   for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) {
          57                 :     /* Do an explicitly unaligned load of the data. */
          58                 :     size_t data;
          59               0 :     memcpy(&data, b + i, sizeof(size_t));
          60                 :
          61               0 :     hash = AddToHash(hash, data, sizeof(data));
          62                 :   }
          63                 :
          64                 :   /* Get the remaining bytes. */
          65               0 :   for (; i < length; i++) {
          66               0 :     hash = AddToHash(hash, b[i]);
          67                 :   }
          68                 :
          69               0 :   return hash;
          70                 : }
          71                 :
          72                 : } /* namespace mozilla */

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