gecko-dev/mfbt/Compression.cpp
Mike Hommey 672db6ba31 Bug 1189967 - Avoid including <string> from Char16.h. r=nfroyd
Since Char16.h is included everywhere, and MSVC 2015 uses the char16ptr_t trick
it contains, we include <string> everywhere, but that has the side effect of
breaking the build in subtle ways. One way around this would be to avoid including
Char16.h in the first place, but that requires more work than I was ready to put
in. So instead, just avoid including <string> by removing the conversion operator
for std::wstring.
2015-08-23 22:20:33 +09:00

74 lines
2.2 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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"
// Without including <string>, MSVC 2015 complains about e.g. the impossibility
// to convert `const void* const` to `void*` when calling memchr from
// corecrt_memory.h.
#include <string>
using namespace mozilla::Compression;
namespace {
#include "lz4.c"
}/* anonymous namespace */
/* Our wrappers */
size_t
LZ4::compress(const char* aSource, size_t aInputSize, char* aDest)
{
CheckedInt<int> inputSizeChecked = aInputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
return LZ4_compress(aSource, aDest, inputSizeChecked.value());
}
size_t
LZ4::compressLimitedOutput(const char* aSource, size_t aInputSize, char* aDest,
size_t aMaxOutputSize)
{
CheckedInt<int> inputSizeChecked = aInputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
MOZ_ASSERT(maxOutputSizeChecked.isValid());
return LZ4_compress_limitedOutput(aSource, aDest, inputSizeChecked.value(),
maxOutputSizeChecked.value());
}
bool
LZ4::decompress(const char* aSource, char* aDest, size_t aOutputSize)
{
CheckedInt<int> outputSizeChecked = aOutputSize;
MOZ_ASSERT(outputSizeChecked.isValid());
int ret = LZ4_decompress_fast(aSource, aDest, outputSizeChecked.value());
return ret >= 0;
}
bool
LZ4::decompress(const char* aSource, size_t aInputSize, char* aDest,
size_t aMaxOutputSize, size_t* aOutputSize)
{
CheckedInt<int> maxOutputSizeChecked = aMaxOutputSize;
MOZ_ASSERT(maxOutputSizeChecked.isValid());
CheckedInt<int> inputSizeChecked = aInputSize;
MOZ_ASSERT(inputSizeChecked.isValid());
int ret = LZ4_decompress_safe(aSource, aDest, inputSizeChecked.value(),
maxOutputSizeChecked.value());
if (ret >= 0) {
*aOutputSize = ret;
return true;
}
*aOutputSize = 0;
return false;
}