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// DeflateDecoder.cpp
#include "StdAfx.h"
#include "DeflateDecoder.h"
namespace NCompress {
namespace NDeflate {
namespace NDecoder {
CCoder::CCoder(bool deflate64Mode): _deflate64Mode(deflate64Mode) {}
void CCoder::DeCodeLevelTable(Byte *newLevels, int numLevels)
{
int i = 0;
while (i < numLevels)
{
UInt32 number = m_LevelDecoder.DecodeSymbol(&m_InBitStream);
if (number < kTableDirectLevels)
newLevels[i++] = Byte(number);
else
{
if (number == kTableLevelRepNumber)
{
int t = m_InBitStream.ReadBits(2) + 3;
for (int reps = t; reps > 0 && i < numLevels ; reps--, i++)
newLevels[i] = newLevels[i - 1];
}
else
{
int num;
if (number == kTableLevel0Number)
num = m_InBitStream.ReadBits(3) + 3;
else
num = m_InBitStream.ReadBits(7) + 11;
for (;num > 0 && i < numLevels; num--)
newLevels[i++] = 0;
}
}
}
}
void CCoder::ReadTables(void)
{
if(m_FinalBlock) // test it
throw CException(CException::kData);
m_FinalBlock = (m_InBitStream.ReadBits(kFinalBlockFieldSize) == NFinalBlockField::kFinalBlock);
int blockType = m_InBitStream.ReadBits(kBlockTypeFieldSize);
switch(blockType)
{
case NBlockType::kStored:
{
m_StoredMode = true;
UInt32 currentBitPosition = m_InBitStream.GetBitPosition();
UInt32 numBitsForAlign = currentBitPosition > 0 ? (8 - currentBitPosition): 0;
if (numBitsForAlign > 0)
m_InBitStream.ReadBits(numBitsForAlign);
m_StoredBlockSize = m_InBitStream.ReadBits(kDeflateStoredBlockLengthFieldSizeSize);
UInt16 onesComplementReverse = ~(UInt16)(m_InBitStream.ReadBits(kDeflateStoredBlockLengthFieldSizeSize));
if (m_StoredBlockSize != onesComplementReverse)
throw CException(CException::kData);
break;
}
case NBlockType::kFixedHuffman:
case NBlockType::kDynamicHuffman:
{
m_StoredMode = false;
Byte litLenLevels[kStaticMainTableSize];
Byte distLevels[kStaticDistTableSize];
if (blockType == NBlockType::kFixedHuffman)
{
int i;
// Leteral / length levels
for (i = 0; i < 144; i++)
litLenLevels[i] = 8;
for (; i < 256; i++)
litLenLevels[i] = 9;
for (; i < 280; i++)
litLenLevels[i] = 7;
for (; i < 288; i++) /* make a complete, but wrong code set */
litLenLevels[i] = 8;
// Distance levels
for (i = 0; i < kStaticDistTableSize; i++) // test it: infozip only use kDistTableSize
distLevels[i] = 5;
}
else // in case when (blockType == kDeflateBlockTypeFixedHuffman)
{
int numLitLenLevels = m_InBitStream.ReadBits(kDeflateNumberOfLengthCodesFieldSize) +
kDeflateNumberOfLitLenCodesMin;
int numDistLevels = m_InBitStream.ReadBits(kDeflateNumberOfDistanceCodesFieldSize) +
kDeflateNumberOfDistanceCodesMin;
int numLevelCodes = m_InBitStream.ReadBits(kDeflateNumberOfLevelCodesFieldSize) +
kDeflateNumberOfLevelCodesMin;
int numLevels = _deflate64Mode ? kHeapTablesSizesSum64 :
kHeapTablesSizesSum32;
Byte levelLevels[kLevelTableSize];
int i;
for (i = 0; i < kLevelTableSize; i++)
{
int position = kCodeLengthAlphabetOrder[i];
if(i < numLevelCodes)
levelLevels[position] = Byte(m_InBitStream.ReadBits(kDeflateLevelCodeFieldSize));
else
levelLevels[position] = 0;
}
try
{
m_LevelDecoder.SetCodeLengths(levelLevels);
}
catch(...)
{
throw CException(CException::kData);
}
Byte tmpLevels[kStaticMaxTableSize];
DeCodeLevelTable(tmpLevels, numLitLenLevels + numDistLevels);
memmove(litLenLevels, tmpLevels, numLitLenLevels);
memset(litLenLevels + numLitLenLevels, 0,
kStaticMainTableSize - numLitLenLevels);
memmove(distLevels, tmpLevels + numLitLenLevels, numDistLevels);
memset(distLevels + numDistLevels, 0, kStaticDistTableSize - numDistLevels);
}
try
{
m_MainDecoder.SetCodeLengths(litLenLevels);
m_DistDecoder.SetCodeLengths(distLevels);
}
catch(...)
{
throw CException(CException::kData);
}
break;
}
default:
throw CException(CException::kData);
}
}
HRESULT CCoder::CodeReal(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
if (!m_OutWindowStream.Create(_deflate64Mode ? kHistorySize64: kHistorySize32))
return E_OUTOFMEMORY;
if (!m_InBitStream.Create(1 << 17))
return E_OUTOFMEMORY;
UInt64 pos = 0;
m_OutWindowStream.SetStream(outStream);
m_OutWindowStream.Init(false);
m_InBitStream.SetStream(inStream);
m_InBitStream.Init();
CCoderReleaser coderReleaser(this);
m_FinalBlock = false;
while(!m_FinalBlock)
{
if (progress != NULL)
{
UInt64 packSize = m_InBitStream.GetProcessedSize();
RINOK(progress->SetRatioInfo(&packSize, &pos));
}
ReadTables();
if(m_StoredMode)
{
for (UInt32 i = 0; i < m_StoredBlockSize; i++)
m_OutWindowStream.PutByte(Byte(m_InBitStream.ReadBits(8)));
pos += m_StoredBlockSize;
continue;
}
while(true)
{
if (m_InBitStream.NumExtraBytes > 4)
throw CException(CException::kData);
UInt32 number = m_MainDecoder.DecodeSymbol(&m_InBitStream);
if (number < 256)
{
if (outSize != NULL)
if (pos >= *outSize)
throw CException(CException::kData);
m_OutWindowStream.PutByte(Byte(number));
pos++;
continue;
}
else if (number >= kMatchNumber)
{
if (outSize != NULL)
if (pos >= *outSize)
throw CException(CException::kData);
number -= kMatchNumber;
UInt32 length;
if (_deflate64Mode)
{
length = UInt32(kLenStart64[number]) + kMatchMinLen;
UInt32 numBits = kLenDirectBits64[number];
if (numBits > 0)
length += m_InBitStream.ReadBits(numBits);
}
else
{
length = UInt32(kLenStart32[number]) + kMatchMinLen;
UInt32 numBits = kLenDirectBits32[number];
if (numBits > 0)
length += m_InBitStream.ReadBits(numBits);
}
number = m_DistDecoder.DecodeSymbol(&m_InBitStream);
UInt32 distance = kDistStart[number] + m_InBitStream.ReadBits(kDistDirectBits[number]);
if (distance >= pos)
throw "data error";
m_OutWindowStream.CopyBlock(distance, length);
pos += length;
}
else if (number == kReadTableNumber)
break;
else
throw CException(CException::kData);
}
}
coderReleaser.NeedFlush = false;
return m_OutWindowStream.Flush();
}
HRESULT CCoder::BaseCode(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
try { return CodeReal(inStream, outStream, inSize, outSize, progress); }
catch(const CInBufferException &e) { return e.ErrorCode; }
catch(const CLZOutWindowException &e) { return e.ErrorCode; }
catch(...) { return S_FALSE; }
}
HRESULT CCoder::BaseGetInStreamProcessedSize(UInt64 *value)
{
if (value == NULL)
return E_INVALIDARG;
*value = m_InBitStream.GetProcessedSize();
return S_OK;
}
STDMETHODIMP CCOMCoder::GetInStreamProcessedSize(UInt64 *value)
{
return BaseGetInStreamProcessedSize(value);
}
HRESULT CCOMCoder::Code(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
return BaseCode(inStream, outStream, inSize, outSize, progress);
}
STDMETHODIMP CCOMCoder64::GetInStreamProcessedSize(UInt64 *value)
{
return BaseGetInStreamProcessedSize(value);
}
HRESULT CCOMCoder64::Code(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
return BaseCode(inStream, outStream, inSize, outSize, progress);
}
}}}
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