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// Arj/Decoder2.cpp
#include "StdAfx.h"
#include "ArjDecoder2.h"
namespace NCompress{
namespace NArj {
namespace NDecoder2 {
static const UInt32 kHistorySize = 26624;
static const UInt32 kMatchMaxLen = 256;
static const UInt32 kMatchMinLen = 3;
STDMETHODIMP CCoder::CodeReal(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 * /* inSize */, const UInt64 *outSize,
ICompressProgressInfo * /* progress */)
{
if (outSize == NULL)
return E_INVALIDARG;
if (!m_OutWindowStream.Create(kHistorySize))
return E_OUTOFMEMORY;
if (!m_InBitStream.Create(1 << 20))
return E_OUTOFMEMORY;
UInt64 pos = 0;
m_OutWindowStream.SetStream(outStream);
m_OutWindowStream.Init(false);
m_InBitStream.SetStream(inStream);
m_InBitStream.Init();
CCoderReleaser coderReleaser(this);
while(pos < *outSize)
{
const UInt32 kStartWidth = 0;
const UInt32 kStopWidth = 7;
UInt32 power = 1 << kStartWidth;
UInt32 width;
UInt32 len = 0;
for (width = kStartWidth; width < kStopWidth; width++)
{
if (m_InBitStream.ReadBits(1) == 0)
break;
len += power;
power <<= 1;
}
if (width != 0)
len += m_InBitStream.ReadBits(width);
if (len == 0)
{
m_OutWindowStream.PutByte((Byte)m_InBitStream.ReadBits(8));
pos++;
continue;
}
else
{
len = len - 1 + kMatchMinLen;
const UInt32 kStartWidth = 9;
const UInt32 kStopWidth = 13;
UInt32 power = 1 << kStartWidth;
UInt32 width;
UInt32 distance = 0;
for (width = kStartWidth; width < kStopWidth; width++)
{
if (m_InBitStream.ReadBits(1) == 0)
break;
distance += power;
power <<= 1;
}
if (width != 0)
distance += m_InBitStream.ReadBits(width);
if (distance >= pos)
throw "data error";
m_OutWindowStream.CopyBlock(distance, len);
pos += len;
}
}
coderReleaser.NeedFlush = false;
return m_OutWindowStream.Flush();
}
STDMETHODIMP CCoder::Code(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; }
}
}}}
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