gecko-dev/mfbt/Compression.cpp
Till Schneidereit 3e95f5657a Bug 888658 - Add LZ4 compression to mfbt. r=jwalden,vlad
--HG--
extra : rebase_source : e92051145948cd3c1e6f95596563d8c13e231ee3
2013-10-18 20:25:30 +02:00

65 lines
1.9 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Compression.h"
#include "mozilla/CheckedInt.h"
using namespace mozilla::Compression;
namespace {
#include "lz4.c"
}/* anonymous namespace */
/* Our wrappers */
size_t
LZ4::compress(const char* source, size_t inputSize, char* dest)
{
CheckedInt<int> inputSizeChecked = inputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
return LZ4_compress(source, dest, inputSizeChecked.value());
}
size_t
LZ4::compressLimitedOutput(const char* source, size_t inputSize, char* dest, size_t maxOutputSize)
{
CheckedInt<int> inputSizeChecked = inputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
CheckedInt<int> maxOutputSizeChecked = maxOutputSize;
MOZ_ASSERT(maxOutputSizeChecked.isValid());
return LZ4_compress_limitedOutput(source, dest, inputSizeChecked.value(),
maxOutputSizeChecked.value());
}
bool
LZ4::decompress(const char* source, char* dest, size_t outputSize)
{
CheckedInt<int> outputSizeChecked = outputSize;
MOZ_ASSERT(outputSizeChecked.isValid());
int ret = LZ4_decompress_fast(source, dest, outputSizeChecked.value());
return ret >= 0;
}
bool
LZ4::decompress(const char* source, size_t inputSize, char* dest, size_t maxOutputSize,
size_t *outputSize)
{
CheckedInt<int> maxOutputSizeChecked = maxOutputSize;
MOZ_ASSERT(maxOutputSizeChecked.isValid());
CheckedInt<int> inputSizeChecked = inputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
int ret = LZ4_decompress_safe(source, dest, inputSizeChecked.value(),
maxOutputSizeChecked.value());
if (ret >= 0) {
*outputSize = ret;
return true;
} else {
*outputSize = 0;
return false;
}
}