Initialer Commit

CPP/7zip/Compress/ZDecoder.h

@@ -0,0 +1,54 @@
+// ZDecoder.h
+
+#ifndef __COMPRESS_Z_DECODER_H
+#define __COMPRESS_Z_DECODER_H
+
+#include "../../Common/MyCom.h"
+
+#include "../ICoder.h"
+
+namespace NCompress {
+namespace NZ {
+
+// Z decoder decodes Z data stream, including 3 bytes of header.
+  
+class CDecoder:
+  public ICompressCoder,
+  public CMyUnknownImp
+{
+  UInt16 *_parents;
+  Byte *_suffixes;
+  Byte *_stack;
+  unsigned _numMaxBits;
+
+public:
+  CDecoder(): _parents(0), _suffixes(0), _stack(0), /* _prop(0), */ _numMaxBits(0) {};
+  ~CDecoder();
+  void Free();
+  UInt64 PackSize;
+
+  MY_UNKNOWN_IMP1(ICompressCoder)
+
+  HRESULT CodeReal(ISequentialInStream *inStream, ISequentialOutStream *outStream,
+      const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
+
+  STDMETHOD(Code)(ISequentialInStream *inStream, ISequentialOutStream *outStream,
+      const UInt64 *inSize, const UInt64 *outSize, ICompressProgressInfo *progress);
+};
+
+/*
+  There is no end_of_payload_marker in Z stream.
+  Z decoder stops decoding, if it reaches end of input stream.
+   
+  CheckStream function:
+    (size) must be at least 3 bytes (size of Z header).
+    if (size) is larger than size of real Z stream in (data), CheckStream can return false.
+*/
+
+const unsigned kRecommendedCheckSize = 64;
+
+bool CheckStream(const Byte *data, size_t size);
+
+}}
+
+#endif