/* -*- 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>

#include "lz4.h"

using namespace mozilla::Compression;

/* 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_default(aSource, aDest, inputSizeChecked.value(),

                              LZ4_compressBound(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_default(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;

}

bool

LZ4::decompressPartial(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_partial(aSource, aDest,

                                        inputSizeChecked.value(),

                                        maxOutputSizeChecked.value(),

                                        maxOutputSizeChecked.value());

  if (ret >= 0) {

    *aOutputSize = ret;

    return true;

  }

  *aOutputSize = 0;

  return false;

}