static SRes SzDecodePpmd(CSzCoderInfo *coder, UInt64 inSize, ILookInStream *inStream,
Byte *outBuffer, SizeT outSize, ISzAlloc *allocMain)
{
CPpmd7 ppmd;
CByteInToLook s;
SRes res = SZ_OK;
s.p.Read = ReadByte;
s.inStream = inStream;
s.begin = s.end = s.cur = NULL;
s.extra = False;
s.res = SZ_OK;
s.processed = 0;
if (coder->Props.size != 5)
return SZ_ERROR_UNSUPPORTED;
{
unsigned order = coder->Props.data[0];
UInt32 memSize = GetUi32(coder->Props.data + 1);
if (order < PPMD7_MIN_ORDER ||
order > PPMD7_MAX_ORDER ||
memSize < PPMD7_MIN_MEM_SIZE ||
memSize > PPMD7_MAX_MEM_SIZE)
return SZ_ERROR_UNSUPPORTED;
Ppmd7_Construct(&ppmd);
if (!Ppmd7_Alloc(&ppmd, memSize, allocMain))
return SZ_ERROR_MEM;
Ppmd7_Init(&ppmd, order);
}
{
CPpmd7z_RangeDec rc;
Ppmd7z_RangeDec_CreateVTable(&rc);
rc.Stream = &s.p;
if (!Ppmd7z_RangeDec_Init(&rc))
res = SZ_ERROR_DATA;
else if (s.extra)
res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
else
{
SizeT i;
for (i = 0; i < outSize; i++)
{
int sym = Ppmd7_DecodeSymbol(&ppmd, &rc.p);
if (s.extra || sym < 0)
break;
outBuffer[i] = (Byte)sym;
}
if (i != outSize)
res = (s.res != SZ_OK ? s.res : SZ_ERROR_DATA);
else if (s.processed + (s.cur - s.begin) != inSize || !Ppmd7z_RangeDec_IsFinishedOK(&rc))
res = SZ_ERROR_DATA;
}
}
Ppmd7_Free(&ppmd, allocMain);
return res;
}
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 CEncoder::Code(ISequentialInStream *inStream, ISequentialOutStream *outStream,
const UInt64 * /* inSize */, const UInt64 * /* outSize */, ICompressProgressInfo *progress)
{
if (!_inBuf)
{
_inBuf = (Byte *)::MidAlloc(kBufSize);
if (!_inBuf)
return E_OUTOFMEMORY;
}
if (!_outStream.Alloc(1 << 20))
return E_OUTOFMEMORY;
if (!Ppmd7_Alloc(&_ppmd, _props.MemSize, &g_BigAlloc))
return E_OUTOFMEMORY;
_outStream.Stream = outStream;
_outStream.Init();
Ppmd7z_RangeEnc_Init(&_rangeEnc);
Ppmd7_Init(&_ppmd, _props.Order);
UInt64 processed = 0;
for (;;)
{
UInt32 size;
RINOK(inStream->Read(_inBuf, kBufSize, &size));
if (size == 0)
{
// We don't write EndMark in PPMD-7z.
// Ppmd7_EncodeSymbol(&_ppmd, &_rangeEnc, -1);
Ppmd7z_RangeEnc_FlushData(&_rangeEnc);
return _outStream.Flush();
}
for (UInt32 i = 0; i < size; i++)
{
Ppmd7_EncodeSymbol(&_ppmd, &_rangeEnc, _inBuf[i]);
RINOK(_outStream.Res);
}
processed += size;
if (progress)
{
UInt64 outSize = _outStream.GetProcessed();
RINOK(progress->SetRatioInfo(&processed, &outSize));
}
}
}
