418 lines
10 KiB
C++
418 lines
10 KiB
C++
// DeflateDecoder.cpp
|
|
|
|
#include "StdAfx.h"
|
|
|
|
#include "DeflateDecoder.h"
|
|
|
|
namespace NCompress {
|
|
namespace NDeflate {
|
|
namespace NDecoder {
|
|
|
|
CCoder::CCoder(bool deflate64Mode, bool deflateNSIS):
|
|
_deflate64Mode(deflate64Mode),
|
|
_deflateNSIS(deflateNSIS),
|
|
_keepHistory(false),
|
|
_needFinishInput(false),
|
|
_needInitInStream(true),
|
|
ZlibMode(false) {}
|
|
|
|
UInt32 CCoder::ReadBits(unsigned numBits)
|
|
{
|
|
return m_InBitStream.ReadBits(numBits);
|
|
}
|
|
|
|
Byte CCoder::ReadAlignedByte()
|
|
{
|
|
return m_InBitStream.ReadAlignedByte();
|
|
}
|
|
|
|
bool CCoder::DecodeLevels(Byte *levels, unsigned numSymbols)
|
|
{
|
|
unsigned i = 0;
|
|
|
|
do
|
|
{
|
|
UInt32 sym = m_LevelDecoder.Decode(&m_InBitStream);
|
|
if (sym < kTableDirectLevels)
|
|
levels[i++] = (Byte)sym;
|
|
else
|
|
{
|
|
if (sym >= kLevelTableSize)
|
|
return false;
|
|
|
|
unsigned num;
|
|
unsigned numBits;
|
|
Byte symbol;
|
|
|
|
if (sym == kTableLevelRepNumber)
|
|
{
|
|
if (i == 0)
|
|
return false;
|
|
numBits = 2;
|
|
num = 0;
|
|
symbol = levels[i - 1];
|
|
}
|
|
else
|
|
{
|
|
sym -= kTableLevel0Number;
|
|
sym <<= 2;
|
|
numBits = 3 + (unsigned)sym;
|
|
num = ((unsigned)sym << 1);
|
|
symbol = 0;
|
|
}
|
|
|
|
num += i + 3 + ReadBits(numBits);
|
|
if (num > numSymbols)
|
|
return false;
|
|
do
|
|
levels[i++] = symbol;
|
|
while (i < num);
|
|
}
|
|
}
|
|
while (i < numSymbols);
|
|
|
|
return true;
|
|
}
|
|
|
|
#define RIF(x) { if (!(x)) return false; }
|
|
|
|
bool CCoder::ReadTables(void)
|
|
{
|
|
m_FinalBlock = (ReadBits(kFinalBlockFieldSize) == NFinalBlockField::kFinalBlock);
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return false;
|
|
UInt32 blockType = ReadBits(kBlockTypeFieldSize);
|
|
if (blockType > NBlockType::kDynamicHuffman)
|
|
return false;
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return false;
|
|
|
|
if (blockType == NBlockType::kStored)
|
|
{
|
|
m_StoredMode = true;
|
|
m_InBitStream.AlignToByte();
|
|
m_StoredBlockSize = ReadAligned_UInt16(); // ReadBits(kStoredBlockLengthFieldSize)
|
|
if (_deflateNSIS)
|
|
return true;
|
|
return (m_StoredBlockSize == (UInt16)~ReadAligned_UInt16());
|
|
}
|
|
|
|
m_StoredMode = false;
|
|
|
|
CLevels levels;
|
|
if (blockType == NBlockType::kFixedHuffman)
|
|
{
|
|
levels.SetFixedLevels();
|
|
_numDistLevels = _deflate64Mode ? kDistTableSize64 : kDistTableSize32;
|
|
}
|
|
else
|
|
{
|
|
unsigned numLitLenLevels = ReadBits(kNumLenCodesFieldSize) + kNumLitLenCodesMin;
|
|
_numDistLevels = ReadBits(kNumDistCodesFieldSize) + kNumDistCodesMin;
|
|
unsigned numLevelCodes = ReadBits(kNumLevelCodesFieldSize) + kNumLevelCodesMin;
|
|
|
|
if (!_deflate64Mode)
|
|
if (_numDistLevels > kDistTableSize32)
|
|
return false;
|
|
|
|
Byte levelLevels[kLevelTableSize];
|
|
for (unsigned i = 0; i < kLevelTableSize; i++)
|
|
{
|
|
unsigned position = kCodeLengthAlphabetOrder[i];
|
|
if (i < numLevelCodes)
|
|
levelLevels[position] = (Byte)ReadBits(kLevelFieldSize);
|
|
else
|
|
levelLevels[position] = 0;
|
|
}
|
|
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return false;
|
|
|
|
RIF(m_LevelDecoder.Build(levelLevels));
|
|
|
|
Byte tmpLevels[kFixedMainTableSize + kFixedDistTableSize];
|
|
if (!DecodeLevels(tmpLevels, numLitLenLevels + _numDistLevels))
|
|
return false;
|
|
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return false;
|
|
|
|
levels.SubClear();
|
|
memcpy(levels.litLenLevels, tmpLevels, numLitLenLevels);
|
|
memcpy(levels.distLevels, tmpLevels + numLitLenLevels, _numDistLevels);
|
|
}
|
|
RIF(m_MainDecoder.Build(levels.litLenLevels));
|
|
return m_DistDecoder.Build(levels.distLevels);
|
|
}
|
|
|
|
HRESULT CCoder::CodeSpec(UInt32 curSize, bool finishInputStream)
|
|
{
|
|
if (_remainLen == kLenIdFinished)
|
|
return S_OK;
|
|
if (_remainLen == kLenIdNeedInit)
|
|
{
|
|
if (!_keepHistory)
|
|
if (!m_OutWindowStream.Create(_deflate64Mode ? kHistorySize64: kHistorySize32))
|
|
return E_OUTOFMEMORY;
|
|
RINOK(InitInStream(_needInitInStream));
|
|
m_OutWindowStream.Init(_keepHistory);
|
|
m_FinalBlock = false;
|
|
_remainLen = 0;
|
|
_needReadTable = true;
|
|
}
|
|
|
|
while (_remainLen > 0 && curSize > 0)
|
|
{
|
|
_remainLen--;
|
|
Byte b = m_OutWindowStream.GetByte(_rep0);
|
|
m_OutWindowStream.PutByte(b);
|
|
curSize--;
|
|
}
|
|
|
|
while (curSize > 0 || finishInputStream)
|
|
{
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return S_FALSE;
|
|
|
|
if (_needReadTable)
|
|
{
|
|
if (m_FinalBlock)
|
|
{
|
|
_remainLen = kLenIdFinished;
|
|
break;
|
|
}
|
|
if (!ReadTables())
|
|
return S_FALSE;
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return S_FALSE;
|
|
_needReadTable = false;
|
|
}
|
|
|
|
if (m_StoredMode)
|
|
{
|
|
if (finishInputStream && curSize == 0 && m_StoredBlockSize != 0)
|
|
return S_FALSE;
|
|
/* NSIS version contains some bits in bitl bits buffer.
|
|
So we must read some first bytes via ReadAlignedByte */
|
|
for (; m_StoredBlockSize > 0 && curSize > 0 && m_InBitStream.ThereAreDataInBitsBuffer(); m_StoredBlockSize--, curSize--)
|
|
m_OutWindowStream.PutByte(ReadAlignedByte());
|
|
for (; m_StoredBlockSize > 0 && curSize > 0; m_StoredBlockSize--, curSize--)
|
|
m_OutWindowStream.PutByte(m_InBitStream.ReadDirectByte());
|
|
_needReadTable = (m_StoredBlockSize == 0);
|
|
continue;
|
|
}
|
|
|
|
while (curSize > 0)
|
|
{
|
|
if (m_InBitStream.ExtraBitsWereRead_Fast())
|
|
return S_FALSE;
|
|
|
|
UInt32 sym = m_MainDecoder.Decode(&m_InBitStream);
|
|
|
|
if (sym < 0x100)
|
|
{
|
|
m_OutWindowStream.PutByte((Byte)sym);
|
|
curSize--;
|
|
continue;
|
|
}
|
|
else if (sym == kSymbolEndOfBlock)
|
|
{
|
|
_needReadTable = true;
|
|
break;
|
|
}
|
|
else if (sym < kMainTableSize)
|
|
{
|
|
sym -= kSymbolMatch;
|
|
UInt32 len;
|
|
{
|
|
unsigned numBits;
|
|
if (_deflate64Mode)
|
|
{
|
|
len = kLenStart64[sym];
|
|
numBits = kLenDirectBits64[sym];
|
|
}
|
|
else
|
|
{
|
|
len = kLenStart32[sym];
|
|
numBits = kLenDirectBits32[sym];
|
|
}
|
|
len += kMatchMinLen + m_InBitStream.ReadBits(numBits);
|
|
}
|
|
UInt32 locLen = len;
|
|
if (locLen > curSize)
|
|
locLen = (UInt32)curSize;
|
|
sym = m_DistDecoder.Decode(&m_InBitStream);
|
|
if (sym >= _numDistLevels)
|
|
return S_FALSE;
|
|
UInt32 distance = kDistStart[sym] + m_InBitStream.ReadBits(kDistDirectBits[sym]);
|
|
if (!m_OutWindowStream.CopyBlock(distance, locLen))
|
|
return S_FALSE;
|
|
curSize -= locLen;
|
|
len -= locLen;
|
|
if (len != 0)
|
|
{
|
|
_remainLen = (Int32)len;
|
|
_rep0 = distance;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
return S_FALSE;
|
|
}
|
|
|
|
if (finishInputStream && curSize == 0)
|
|
{
|
|
if (m_MainDecoder.Decode(&m_InBitStream) != kSymbolEndOfBlock)
|
|
return S_FALSE;
|
|
_needReadTable = true;
|
|
}
|
|
}
|
|
|
|
if (m_InBitStream.ExtraBitsWereRead())
|
|
return S_FALSE;
|
|
|
|
return S_OK;
|
|
}
|
|
|
|
|
|
#ifdef _NO_EXCEPTIONS
|
|
|
|
#define DEFLATE_TRY_BEGIN
|
|
#define DEFLATE_TRY_END(res)
|
|
|
|
#else
|
|
|
|
#define DEFLATE_TRY_BEGIN try {
|
|
#define DEFLATE_TRY_END(res) } \
|
|
catch(const CInBufferException &e) { res = e.ErrorCode; } \
|
|
catch(const CLzOutWindowException &e) { res = e.ErrorCode; } \
|
|
catch(...) { res = S_FALSE; }
|
|
|
|
#endif
|
|
|
|
|
|
HRESULT CCoder::CodeReal(ISequentialOutStream *outStream,
|
|
const UInt64 *outSize, ICompressProgressInfo *progress)
|
|
{
|
|
HRESULT res;
|
|
DEFLATE_TRY_BEGIN
|
|
m_OutWindowStream.SetStream(outStream);
|
|
CCoderReleaser flusher(this);
|
|
|
|
const UInt64 inStart = _needInitInStream ? 0 : m_InBitStream.GetProcessedSize();
|
|
const UInt64 start = m_OutWindowStream.GetProcessedSize();
|
|
|
|
for (;;)
|
|
{
|
|
UInt32 curSize = 1 << 18;
|
|
bool finishInputStream = false;
|
|
if (outSize)
|
|
{
|
|
const UInt64 rem = *outSize - (m_OutWindowStream.GetProcessedSize() - start);
|
|
if (curSize >= rem)
|
|
{
|
|
curSize = (UInt32)rem;
|
|
if (ZlibMode || _needFinishInput)
|
|
finishInputStream = true;
|
|
}
|
|
}
|
|
if (!finishInputStream && curSize == 0)
|
|
break;
|
|
RINOK(CodeSpec(curSize, finishInputStream));
|
|
if (_remainLen == kLenIdFinished)
|
|
break;
|
|
if (progress)
|
|
{
|
|
const UInt64 inSize = m_InBitStream.GetProcessedSize() - inStart;
|
|
const UInt64 nowPos64 = m_OutWindowStream.GetProcessedSize() - start;
|
|
RINOK(progress->SetRatioInfo(&inSize, &nowPos64));
|
|
}
|
|
}
|
|
|
|
if (_remainLen == kLenIdFinished && ZlibMode)
|
|
{
|
|
m_InBitStream.AlignToByte();
|
|
for (unsigned i = 0; i < 4; i++)
|
|
ZlibFooter[i] = ReadAlignedByte();
|
|
}
|
|
|
|
flusher.NeedFlush = false;
|
|
res = Flush();
|
|
if (res == S_OK && _remainLen != kLenIdNeedInit && InputEofError())
|
|
return S_FALSE;
|
|
DEFLATE_TRY_END(res)
|
|
return res;
|
|
}
|
|
|
|
HRESULT CCoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
|
|
const UInt64 * /* inSize */, const UInt64 *outSize, ICompressProgressInfo *progress)
|
|
{
|
|
SetInStream(inStream);
|
|
SetOutStreamSize(outSize);
|
|
HRESULT res = CodeReal(outStream, outSize, progress);
|
|
ReleaseInStream();
|
|
return res;
|
|
}
|
|
|
|
STDMETHODIMP CCoder::GetInStreamProcessedSize(UInt64 *value)
|
|
{
|
|
if (!value)
|
|
return E_INVALIDARG;
|
|
*value = m_InBitStream.GetProcessedSize();
|
|
return S_OK;
|
|
}
|
|
|
|
STDMETHODIMP CCoder::SetInStream(ISequentialInStream *inStream)
|
|
{
|
|
m_InStreamRef = inStream;
|
|
m_InBitStream.SetStream(inStream);
|
|
return S_OK;
|
|
}
|
|
|
|
STDMETHODIMP CCoder::ReleaseInStream()
|
|
{
|
|
m_InStreamRef.Release();
|
|
return S_OK;
|
|
}
|
|
|
|
STDMETHODIMP CCoder::SetOutStreamSize(const UInt64 * /* outSize */)
|
|
{
|
|
_remainLen = kLenIdNeedInit;
|
|
_needInitInStream = true;
|
|
m_OutWindowStream.Init(_keepHistory);
|
|
return S_OK;
|
|
}
|
|
|
|
#ifndef NO_READ_FROM_CODER
|
|
|
|
STDMETHODIMP CCoder::Read(void *data, UInt32 size, UInt32 *processedSize)
|
|
{
|
|
HRESULT res;
|
|
DEFLATE_TRY_BEGIN
|
|
if (processedSize)
|
|
*processedSize = 0;
|
|
const UInt64 startPos = m_OutWindowStream.GetProcessedSize();
|
|
m_OutWindowStream.SetMemStream((Byte *)data);
|
|
res = CodeSpec(size, false);
|
|
if (res == S_OK)
|
|
{
|
|
res = Flush();
|
|
if (processedSize)
|
|
*processedSize = (UInt32)(m_OutWindowStream.GetProcessedSize() - startPos);
|
|
}
|
|
DEFLATE_TRY_END(res)
|
|
m_OutWindowStream.SetMemStream(NULL);
|
|
return res;
|
|
}
|
|
|
|
#endif
|
|
|
|
STDMETHODIMP CCoder::CodeResume(ISequentialOutStream *outStream, const UInt64 *outSize, ICompressProgressInfo *progress)
|
|
{
|
|
_remainLen = kLenIdNeedInit;
|
|
m_OutWindowStream.Init(_keepHistory);
|
|
return CodeReal(outStream, outSize, progress);
|
|
}
|
|
|
|
}}}
|