The Tor Browser / file comparison
comparison: mfbt/HashFunctions.cpp
mfbt/HashFunctions.cpp
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
equal
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| -1:000000000000 | 0:6154c55b5e19 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* Implementations of hash functions. */ | |
| 7 | |
| 8 #include "mozilla/HashFunctions.h" | |
| 9 #include "mozilla/Types.h" | |
| 10 | |
| 11 #include <string.h> | |
| 12 | |
| 13 namespace mozilla { | |
| 14 | |
| 15 uint32_t | |
| 16 HashBytes(const void* bytes, size_t length) | |
| 17 { | |
| 18 uint32_t hash = 0; | |
| 19 const char* b = reinterpret_cast<const char*>(bytes); | |
| 20 | |
| 21 /* Walk word by word. */ | |
| 22 size_t i = 0; | |
| 23 for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) { | |
| 24 /* Do an explicitly unaligned load of the data. */ | |
| 25 size_t data; | |
| 26 memcpy(&data, b + i, sizeof(size_t)); | |
| 27 | |
| 28 hash = AddToHash(hash, data, sizeof(data)); | |
| 29 } | |
| 30 | |
| 31 /* Get the remaining bytes. */ | |
| 32 for (; i < length; i++) | |
| 33 hash = AddToHash(hash, b[i]); | |
| 34 | |
| 35 return hash; | |
| 36 } | |
| 37 | |
| 38 } /* namespace mozilla */ |
