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// PpmdDecoder.cpp
// 2009-03-11 : Igor Pavlov : Public domain
#include "StdAfx.h"
#include "../../../C/Alloc.h"
#include "../../../C/CpuArch.h"
#include "../Common/StreamUtils.h"
#include "PpmdDecoder.h"
namespace NCompress {
namespace NPpmd {
static const UInt32 kBufSize = (1 << 20);
enum
{
kStatus_NeedInit,
kStatus_Normal,
kStatus_Finished,
kStatus_Error
};
CDecoder::~CDecoder()
{
::MidFree(_outBuf);
Ppmd7_Free(&_ppmd, &g_BigAlloc);
}
STDMETHODIMP CDecoder::SetDecoderProperties2(const Byte *props, UInt32 size)
{
if (size < 5)
return E_INVALIDARG;
_order = props[0];
UInt32 memSize = GetUi32(props + 1);
if (_order < PPMD7_MIN_ORDER ||
_order > PPMD7_MAX_ORDER ||
memSize < PPMD7_MIN_MEM_SIZE ||
memSize > PPMD7_MAX_MEM_SIZE)
return E_NOTIMPL;
if (!_inStream.Alloc(1 << 20))
return E_OUTOFMEMORY;
if (!Ppmd7_Alloc(&_ppmd, memSize, &g_BigAlloc))
return E_OUTOFMEMORY;
return S_OK;
}
HRESULT CDecoder::CodeSpec(Byte *memStream, UInt32 size)
{
switch (_status)
{
case kStatus_Finished: return S_OK;
case kStatus_Error: return S_FALSE;
case kStatus_NeedInit:
_inStream.Init();
if (!Ppmd7z_RangeDec_Init(&_rangeDec))
{
_status = kStatus_Error;
return S_FALSE;
}
_status = kStatus_Normal;
Ppmd7_Init(&_ppmd, _order);
break;
}
if (_outSizeDefined)
{
const UInt64 rem = _outSize - _processedSize;
if (size > rem)
size = (UInt32)rem;
}
UInt32 i;
int sym = 0;
for (i = 0; i != size; i++)
{
sym = Ppmd7_DecodeSymbol(&_ppmd, &_rangeDec.p);
if (_inStream.Extra || sym < 0)
break;
memStream[i] = (Byte)sym;
}
_processedSize += i;
if (_inStream.Extra)
{
_status = kStatus_Error;
return _inStream.Res;
}
if (sym < 0)
_status = (sym < -1) ? kStatus_Error : kStatus_Finished;
return S_OK;
}
STDMETHODIMP CDecoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 * /* inSize */, const UInt64 *outSize, ICompressProgressInfo *progress)
{
if (!_outBuf)
{
_outBuf = (Byte *)::MidAlloc(kBufSize);
if (!_outBuf)
return E_OUTOFMEMORY;
}
_inStream.Stream = inStream;
SetOutStreamSize(outSize);
do
{
const UInt64 startPos = _processedSize;
HRESULT res = CodeSpec(_outBuf, kBufSize);
size_t processed = (size_t)(_processedSize - startPos);
RINOK(WriteStream(outStream, _outBuf, processed));
RINOK(res);
if (_status == kStatus_Finished)
break;
if (progress)
{
UInt64 inSize = _inStream.GetProcessed();
RINOK(progress->SetRatioInfo(&inSize, &_processedSize));
}
}
while (!_outSizeDefined || _processedSize < _outSize);
return S_OK;
}
STDMETHODIMP CDecoder::SetOutStreamSize(const UInt64 *outSize)
{
_outSizeDefined = (outSize != NULL);
if (_outSizeDefined)
_outSize = *outSize;
_processedSize = 0;
_status = kStatus_NeedInit;
return S_OK;
}
#ifndef NO_READ_FROM_CODER
STDMETHODIMP CDecoder::SetInStream(ISequentialInStream *inStream)
{
InSeqStream = inStream;
_inStream.Stream = inStream;
return S_OK;
}
STDMETHODIMP CDecoder::ReleaseInStream()
{
InSeqStream.Release();
return S_OK;
}
STDMETHODIMP CDecoder::Read(void *data, UInt32 size, UInt32 *processedSize)
{
const UInt64 startPos = _processedSize;
HRESULT res = CodeSpec((Byte *)data, size);
if (processedSize)
*processedSize = (UInt32)(_processedSize - startPos);
return res;
}
#endif
}}
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