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; }
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; }