mfbt/Compression.cpp@97036ab72558 (annotated)
mfbt/Compression.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 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | #include "mozilla/Compression.h" |
| michael@0 | 6 | #include "mozilla/CheckedInt.h" |
| michael@0 | 7 | using namespace mozilla::Compression; |
| michael@0 | 8 | |
| michael@0 | 9 | namespace { |
| michael@0 | 10 | |
| michael@0 | 11 | #include "lz4.c" |
| michael@0 | 12 | |
| michael@0 | 13 | }/* anonymous namespace */ |
| michael@0 | 14 | |
| michael@0 | 15 | /* Our wrappers */ |
| michael@0 | 16 | |
| michael@0 | 17 | size_t |
| michael@0 | 18 | LZ4::compress(const char* source, size_t inputSize, char* dest) |
| michael@0 | 19 | { |
| michael@0 | 20 | CheckedInt<int> inputSizeChecked = inputSize; |
| michael@0 | 21 | MOZ_ASSERT(inputSizeChecked.isValid()); |
| michael@0 | 22 | return LZ4_compress(source, dest, inputSizeChecked.value()); |
| michael@0 | 23 | } |
| michael@0 | 24 | |
| michael@0 | 25 | size_t |
| michael@0 | 26 | LZ4::compressLimitedOutput(const char* source, size_t inputSize, char* dest, size_t maxOutputSize) |
| michael@0 | 27 | { |
| michael@0 | 28 | CheckedInt<int> inputSizeChecked = inputSize; |
| michael@0 | 29 | MOZ_ASSERT(inputSizeChecked.isValid()); |
| michael@0 | 30 | CheckedInt<int> maxOutputSizeChecked = maxOutputSize; |
| michael@0 | 31 | MOZ_ASSERT(maxOutputSizeChecked.isValid()); |
| michael@0 | 32 | return LZ4_compress_limitedOutput(source, dest, inputSizeChecked.value(), |
| michael@0 | 33 | maxOutputSizeChecked.value()); |
| michael@0 | 34 | } |
| michael@0 | 35 | |
| michael@0 | 36 | bool |
| michael@0 | 37 | LZ4::decompress(const char* source, char* dest, size_t outputSize) |
| michael@0 | 38 | { |
| michael@0 | 39 | CheckedInt<int> outputSizeChecked = outputSize; |
| michael@0 | 40 | MOZ_ASSERT(outputSizeChecked.isValid()); |
| michael@0 | 41 | int ret = LZ4_decompress_fast(source, dest, outputSizeChecked.value()); |
| michael@0 | 42 | return ret >= 0; |
| michael@0 | 43 | } |
| michael@0 | 44 | |
| michael@0 | 45 | bool |
| michael@0 | 46 | LZ4::decompress(const char* source, size_t inputSize, char* dest, size_t maxOutputSize, |
| michael@0 | 47 | size_t *outputSize) |
| michael@0 | 48 | { |
| michael@0 | 49 | CheckedInt<int> maxOutputSizeChecked = maxOutputSize; |
| michael@0 | 50 | MOZ_ASSERT(maxOutputSizeChecked.isValid()); |
| michael@0 | 51 | CheckedInt<int> inputSizeChecked = inputSize; |
| michael@0 | 52 | MOZ_ASSERT(inputSizeChecked.isValid()); |
| michael@0 | 53 | |
| michael@0 | 54 | int ret = LZ4_decompress_safe(source, dest, inputSizeChecked.value(), |
| michael@0 | 55 | maxOutputSizeChecked.value()); |
| michael@0 | 56 | if (ret >= 0) { |
| michael@0 | 57 | *outputSize = ret; |
| michael@0 | 58 | return true; |
| michael@0 | 59 | } else { |
| michael@0 | 60 | *outputSize = 0; |
| michael@0 | 61 | return false; |
| michael@0 | 62 | } |
| michael@0 | 63 | } |
| michael@0 | 64 |
