mfbt/HashFunctions.cpp@97036ab72558 (annotated)
mfbt/HashFunctions.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | /* Implementations of hash functions. */ |
| michael@0 | 7 | |
| michael@0 | 8 | #include "mozilla/HashFunctions.h" |
| michael@0 | 9 | #include "mozilla/Types.h" |
| michael@0 | 10 | |
| michael@0 | 11 | #include <string.h> |
| michael@0 | 12 | |
| michael@0 | 13 | namespace mozilla { |
| michael@0 | 14 | |
| michael@0 | 15 | uint32_t |
| michael@0 | 16 | HashBytes(const void* bytes, size_t length) |
| michael@0 | 17 | { |
| michael@0 | 18 | uint32_t hash = 0; |
| michael@0 | 19 | const char* b = reinterpret_cast<const char*>(bytes); |
| michael@0 | 20 | |
| michael@0 | 21 | /* Walk word by word. */ |
| michael@0 | 22 | size_t i = 0; |
| michael@0 | 23 | for (; i < length - (length % sizeof(size_t)); i += sizeof(size_t)) { |
| michael@0 | 24 | /* Do an explicitly unaligned load of the data. */ |
| michael@0 | 25 | size_t data; |
| michael@0 | 26 | memcpy(&data, b + i, sizeof(size_t)); |
| michael@0 | 27 | |
| michael@0 | 28 | hash = AddToHash(hash, data, sizeof(data)); |
| michael@0 | 29 | } |
| michael@0 | 30 | |
| michael@0 | 31 | /* Get the remaining bytes. */ |
| michael@0 | 32 | for (; i < length; i++) |
| michael@0 | 33 | hash = AddToHash(hash, b[i]); |
| michael@0 | 34 | |
| michael@0 | 35 | return hash; |
| michael@0 | 36 | } |
| michael@0 | 37 | |
| michael@0 | 38 | } /* namespace mozilla */ |
