#ifndef _RAR_QOPEN_
 #define _RAR_QOPEN_
 
 struct QuickOpenItem
 {
   byte *Header;
   size_t HeaderSize;
   uint64 ArcPos;
   QuickOpenItem *Next;
 };
 
 
 class Archive;
 class RawRead;
 
 class QuickOpen
 {
   private:
     void Close();
 
 
     uint ReadBuffer();
     bool ReadRaw(RawRead &Raw);
     bool ReadNext();
 
     Archive *Arc;
     bool WriteMode;
 
     QuickOpenItem *ListStart;
     QuickOpenItem *ListEnd;
     

     byte *Buf; // Read quick open data here.
     static const size_t MaxBufSize=0x10000; // Buf size, must be multiple of CRYPT_BLOCK_SIZE.
     size_t CurBufSize; // Current size of buffered data in write mode.

 #ifndef RAR_NOCRYPT // For shell extension.
     CryptData Crypt;
 #endif
 
     bool Loaded;

     uint64 QOHeaderPos;  // Main QO header position.
     uint64 RawDataStart; // Start of QO data, just after the main header.
     uint64 RawDataSize;  // Size of entire QO data.
     uint64 RawDataPos;   // Current read position in QO data.
     size_t ReadBufSize;  // Size of Buf data currently read from QO.
     size_t ReadBufPos;   // Current read position in Buf data.

     Array<byte> LastReadHeader;
     uint64 LastReadHeaderPos;
     uint64 SeekPos;

     bool UnsyncSeekPos;  // QOpen SeekPos does not match an actual file pointer.

   public:
     QuickOpen();
     ~QuickOpen();
     void Init(Archive *Arc,bool WriteMode);
     void Load(uint64 BlockPos);
     void Unload() { Loaded=false; }
     bool Read(void *Data,size_t Size,size_t &Result);
     bool Seek(int64 Offset,int Method);
     bool Tell(int64 *Pos);
 };
 
 #endif