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#include "Portable.h"
#include "DeflateDecoder.h"
namespace NDeflate {
namespace NDecoder {
static const UINT32 kWindowReservSize = (1 << 17) + 256;
CCoder::CCoder() :
m_MainDecoder(kStaticMainTableSize),
m_DistDecoder(kStaticDistTableSize),
m_LevelDecoder(kLevelTableSize)
{}
void CCoder::DeCodeLevelTable(BYTE *aNewLevels, int aNumLevels)
{
int i = 0;
while (i < aNumLevels)
{
UINT32 aNumber = m_LevelDecoder.DecodeSymbol(&m_InBitStream);
if (aNumber < kTableDirectLevels)
aNewLevels[i++] = BYTE(aNumber);
else
{
if (aNumber == kTableLevelRepNumber)
{
int t = m_InBitStream.ReadBits(2) + 3;
for (int aReps = t; aReps > 0 && i < aNumLevels ; aReps--, i++)
aNewLevels[i] = aNewLevels[i - 1];
}
else
{
int aNum;
if (aNumber == kTableLevel0Number)
aNum = m_InBitStream.ReadBits(3) + 3;
else
aNum = m_InBitStream.ReadBits(7) + 11;
for (;aNum > 0 && i < aNumLevels; aNum--)
aNewLevels[i++] = 0;
}
}
}
}
void CCoder::ReadTables(void)
{
if(m_FinalBlock) // test it
throw E_INVALIDDATA;
m_FinalBlock = (m_InBitStream.ReadBits(kFinalBlockFieldSize) == NFinalBlockField::kFinalBlock);
int aBlockType = m_InBitStream.ReadBits(kBlockTypeFieldSize);
switch(aBlockType)
{
case NBlockType::kStored:
{
m_StoredMode = true;
UINT32 aCurrentBitPosition = m_InBitStream.GetBitPosition();
UINT32 aNumBitsForAlign = aCurrentBitPosition > 0 ? (8 - aCurrentBitPosition): 0;
if (aNumBitsForAlign > 0)
m_InBitStream.ReadBits(aNumBitsForAlign);
m_StoredBlockSize = m_InBitStream.ReadBits(kDeflateStoredBlockLengthFieldSizeSize);
WORD anOnesComplementReverse = ~WORD(m_InBitStream.ReadBits(kDeflateStoredBlockLengthFieldSizeSize));
if (m_StoredBlockSize != anOnesComplementReverse)
throw E_INVALIDDATA;
break;
}
case NBlockType::kFixedHuffman:
case NBlockType::kDynamicHuffman:
{
m_StoredMode = false;
BYTE aLitLenLevels[kStaticMainTableSize];
BYTE aDistLevels[kStaticDistTableSize];
if (aBlockType == NBlockType::kFixedHuffman)
{
int i;
// Leteral / length levels
for (i = 0; i < 144; i++)
aLitLenLevels[i] = 8;
for (; i < 256; i++)
aLitLenLevels[i] = 9;
for (; i < 280; i++)
aLitLenLevels[i] = 7;
for (; i < 288; i++) /* make a complete, but wrong code set */
aLitLenLevels[i] = 8;
// Distance levels
for (i = 0; i < kStaticDistTableSize; i++) // test it: infozip only use kDistTableSize
aDistLevels[i] = 5;
}
else // in case when (aBlockType == kDeflateBlockTypeFixedHuffman)
{
int aNumLitLenLevels = m_InBitStream.ReadBits(kDeflateNumberOfLengthCodesFieldSize) +
kDeflateNumberOfLitLenCodesMin;
int aNumDistLevels = m_InBitStream.ReadBits(kDeflateNumberOfDistanceCodesFieldSize) +
kDeflateNumberOfDistanceCodesMin;
int aNumLevelCodes = m_InBitStream.ReadBits(kDeflateNumberOfLevelCodesFieldSize) +
kDeflateNumberOfLevelCodesMin;
BYTE aLevelLevels[kLevelTableSize];
int i;
for (i = 0; i < kLevelTableSize; i++)
{
int aPosition = kCodeLengthAlphabetOrder[i];
if(i < aNumLevelCodes)
aLevelLevels[aPosition] = BYTE(m_InBitStream.ReadBits(kDeflateLevelCodeFieldSize));
else
aLevelLevels[aPosition] = 0;
}
try
{
m_LevelDecoder.SetCodeLengths(aLevelLevels);
}
catch(...)
{
throw E_INVALIDDATA;
}
BYTE aTmpLevels[kStaticMaxTableSize];
DeCodeLevelTable(aTmpLevels, aNumLitLenLevels + aNumDistLevels);
memmove(aLitLenLevels, aTmpLevels, aNumLitLenLevels);
memset(aLitLenLevels + aNumLitLenLevels, 0,
kStaticMainTableSize - aNumLitLenLevels);
memmove(aDistLevels, aTmpLevels + aNumLitLenLevels, aNumDistLevels);
memset(aDistLevels + aNumDistLevels, 0, kStaticDistTableSize - aNumDistLevels);
}
try
{
m_MainDecoder.SetCodeLengths(aLitLenLevels);
m_DistDecoder.SetCodeLengths(aDistLevels);
}
catch(...)
{
throw E_INVALIDDATA;
}
break;
}
default:
throw E_INVALIDDATA;
}
}
HRESULT CCoder::CodeReal(ISequentialInStream *anInStream, ISequentialOutStream *anOutStream, const UINT64 *anInSize, const UINT64 *anOutSize)
{
if (m_OutWindowStream.GetBuffer() == 0)
{
try
{
m_OutWindowStream.Create(kHistorySize, kMatchMaxLen, kWindowReservSize);
}
catch(...)
{
return E_OUTOFMEMORY;
}
}
UINT64 aPos = 0;
m_OutWindowStream.Init(anOutStream, false);
m_InBitStream.Init(anInStream);
m_FinalBlock = false;
while(!m_FinalBlock)
{
ReadTables();
if(m_StoredMode)
{
for (UINT32 i = 0; i < m_StoredBlockSize; i++)
m_OutWindowStream.PutOneByte(BYTE(m_InBitStream.ReadBits(8)));
aPos += m_StoredBlockSize;
continue;
}
while(true)
{
UINT32 aNumber = m_MainDecoder.DecodeSymbol(&m_InBitStream);
if (aNumber < 256)
{
if (anOutSize != NULL)
if (aPos >= *anOutSize)
throw E_INVALIDDATA;
m_OutWindowStream.PutOneByte(BYTE(aNumber));
aPos++;
continue;
}
else if (aNumber >= kMatchNumber)
{
if (anOutSize != NULL)
if (aPos >= *anOutSize)
throw E_INVALIDDATA;
aNumber -= kMatchNumber;
UINT32 aLength = UINT32(kLenStart[aNumber]) + kMatchMinLen;
UINT32 aNumBits;
if ((aNumBits = kLenDirectBits[aNumber]) > 0)
aLength += m_InBitStream.ReadBits(aNumBits);
aNumber = m_DistDecoder.DecodeSymbol(&m_InBitStream);
UINT32 aDistance = kDistStart[aNumber] + m_InBitStream.ReadBits(kDistDirectBits[aNumber]);
if (aDistance >= aPos)
throw E_INVALIDDATA;
m_OutWindowStream.CopyBackBlock(aDistance, aLength);
aPos += aLength;
}
else if (aNumber == kReadTableNumber)
break;
else
throw E_INVALIDDATA;
}
}
return m_OutWindowStream.Flush();
}
HRESULT CCoder::Code(ISequentialInStream *anInStream, ISequentialOutStream *anOutStream, const UINT64 *anInSize, const UINT64 *anOutSize)
{
try {
return CodeReal(anInStream, anOutStream, anInSize, anOutSize);
} catch (HRESULT& e) {
return e;
} catch (...) {
return E_FAIL;
}
}
}}
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