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// PPMDDecoder.cpp
#include "StdAfx.h"
#include "Common/Defs.h"
#include "Windows/Defs.h"
#include "PPMDDecoder.h"
namespace NCompress {
namespace NPPMD {
const int kLenIdFinished = -1;
const int kLenIdNeedInit = -2;
STDMETHODIMP CDecoder::SetDecoderProperties2(const Byte *properties, UInt32 size)
{
if (size < 5)
return E_INVALIDARG;
_order = properties[0];
_usedMemorySize = 0;
for (int i = 0; i < 4; i++)
_usedMemorySize += ((UInt32)(properties[1 + i])) << (i * 8);
if (_usedMemorySize > kMaxMemBlockSize)
return E_NOTIMPL;
if (!_rangeDecoder.Create(1 << 20))
return E_OUTOFMEMORY;
if (!_info.SubAllocator.StartSubAllocator(_usedMemorySize))
return E_OUTOFMEMORY;
return S_OK;
}
class CDecoderFlusher
{
CDecoder *_coder;
public:
bool NeedFlush;
CDecoderFlusher(CDecoder *coder): _coder(coder), NeedFlush(true) {}
~CDecoderFlusher()
{
if (NeedFlush)
_coder->Flush();
_coder->ReleaseStreams();
}
};
HRESULT CDecoder::CodeSpec(UInt32 size, Byte *memStream)
{
if (_outSizeDefined)
{
const UInt64 rem = _outSize - _processedSize;
if (size > rem)
size = (UInt32)rem;
}
const UInt32 startSize = size;
if (_remainLen == kLenIdFinished)
return S_OK;
if (_remainLen == kLenIdNeedInit)
{
_rangeDecoder.Init();
_remainLen = 0;
_info.MaxOrder = 0;
_info.StartModelRare(_order);
}
while (size != 0)
{
int symbol = _info.DecodeSymbol(&_rangeDecoder);
if (symbol < 0)
{
_remainLen = kLenIdFinished;
break;
}
if (memStream != 0)
*memStream++ = (Byte)symbol;
else
_outStream.WriteByte((Byte)symbol);
size--;
}
_processedSize += startSize - size;
return S_OK;
}
STDMETHODIMP CDecoder::CodeReal(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 * /* inSize */, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
if (!_outStream.Create(1 << 20))
return E_OUTOFMEMORY;
SetInStream(inStream);
_outStream.SetStream(outStream);
SetOutStreamSize(outSize);
CDecoderFlusher flusher(this);
for (;;)
{
_processedSize = _outStream.GetProcessedSize();
UInt32 curSize = (1 << 18);
RINOK(CodeSpec(curSize, NULL));
if (_remainLen == kLenIdFinished)
break;
if (progress != NULL)
{
UInt64 inSize = _rangeDecoder.GetProcessedSize();
RINOK(progress->SetRatioInfo(&inSize, &_processedSize));
}
if (_outSizeDefined)
if (_outStream.GetProcessedSize() >= _outSize)
break;
}
flusher.NeedFlush = false;
return Flush();
}
#ifdef _NO_EXCEPTIONS
#define PPMD_TRY_BEGIN
#define PPMD_TRY_END
#else
#define PPMD_TRY_BEGIN try {
#define PPMD_TRY_END } \
catch(const CInBufferException &e) { return e.ErrorCode; } \
catch(const COutBufferException &e) { return e.ErrorCode; } \
catch(...) { return S_FALSE; }
#endif
STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream,
ISequentialOutStream *outStream, const UInt64 *inSize, const UInt64 *outSize,
ICompressProgressInfo *progress)
{
PPMD_TRY_BEGIN
return CodeReal(inStream, outStream, inSize, outSize, progress);
PPMD_TRY_END
}
STDMETHODIMP CDecoder::SetInStream(ISequentialInStream *inStream)
{
_rangeDecoder.SetStream(inStream);
return S_OK;
}
STDMETHODIMP CDecoder::ReleaseInStream()
{
_rangeDecoder.ReleaseStream();
return S_OK;
}
STDMETHODIMP CDecoder::SetOutStreamSize(const UInt64 *outSize)
{
_outSizeDefined = (outSize != NULL);
if (_outSizeDefined)
_outSize = *outSize;
_processedSize = 0;
_remainLen = kLenIdNeedInit;
_outStream.Init();
return S_OK;
}
#ifdef _ST_MODE
STDMETHODIMP CDecoder::Read(void *data, UInt32 size, UInt32 *processedSize)
{
PPMD_TRY_BEGIN
if (processedSize)
*processedSize = 0;
const UInt64 startPos = _processedSize;
RINOK(CodeSpec(size, (Byte *)data));
if (processedSize)
*processedSize = (UInt32)(_processedSize - startPos);
return Flush();
PPMD_TRY_END
}
#endif
}}
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