1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/Compression.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,64 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "mozilla/Compression.h"
1.9 +#include "mozilla/CheckedInt.h"
1.10 +using namespace mozilla::Compression;
1.11 +
1.12 +namespace {
1.13 +
1.14 +#include "lz4.c"
1.15 +
1.16 +}/* anonymous namespace */
1.17 +
1.18 +/* Our wrappers */
1.19 +
1.20 +size_t
1.21 +LZ4::compress(const char* source, size_t inputSize, char* dest)
1.22 +{
1.23 + CheckedInt<int> inputSizeChecked = inputSize;
1.24 + MOZ_ASSERT(inputSizeChecked.isValid());
1.25 + return LZ4_compress(source, dest, inputSizeChecked.value());
1.26 +}
1.27 +
1.28 +size_t
1.29 +LZ4::compressLimitedOutput(const char* source, size_t inputSize, char* dest, size_t maxOutputSize)
1.30 +{
1.31 + CheckedInt<int> inputSizeChecked = inputSize;
1.32 + MOZ_ASSERT(inputSizeChecked.isValid());
1.33 + CheckedInt<int> maxOutputSizeChecked = maxOutputSize;
1.34 + MOZ_ASSERT(maxOutputSizeChecked.isValid());
1.35 + return LZ4_compress_limitedOutput(source, dest, inputSizeChecked.value(),
1.36 + maxOutputSizeChecked.value());
1.37 +}
1.38 +
1.39 +bool
1.40 +LZ4::decompress(const char* source, char* dest, size_t outputSize)
1.41 +{
1.42 + CheckedInt<int> outputSizeChecked = outputSize;
1.43 + MOZ_ASSERT(outputSizeChecked.isValid());
1.44 + int ret = LZ4_decompress_fast(source, dest, outputSizeChecked.value());
1.45 + return ret >= 0;
1.46 +}
1.47 +
1.48 +bool
1.49 +LZ4::decompress(const char* source, size_t inputSize, char* dest, size_t maxOutputSize,
1.50 + size_t *outputSize)
1.51 +{
1.52 + CheckedInt<int> maxOutputSizeChecked = maxOutputSize;
1.53 + MOZ_ASSERT(maxOutputSizeChecked.isValid());
1.54 + CheckedInt<int> inputSizeChecked = inputSize;
1.55 + MOZ_ASSERT(inputSizeChecked.isValid());
1.56 +
1.57 + int ret = LZ4_decompress_safe(source, dest, inputSizeChecked.value(),
1.58 + maxOutputSizeChecked.value());
1.59 + if (ret >= 0) {
1.60 + *outputSize = ret;
1.61 + return true;
1.62 + } else {
1.63 + *outputSize = 0;
1.64 + return false;
1.65 + }
1.66 +}
1.67 +
