#ifndef _RAR_GETBITS_

#define _RAR_GETBITS_

class BitInput

{

  public:

    enum BufferSize {MAX_SIZE=0x8000}; // Size of input buffer.

    int InAddr; // Curent byte position in the buffer.

    int InBit;  // Current bit position in the current byte.

    bool ExternalBuffer;

  public:

    BitInput(bool AllocBuffer);

    ~BitInput();

    byte *InBuf; // Dynamically allocated input buffer.

    void InitBitInput()

    {

      InAddr=InBit=0;

    }

    // Move forward by 'Bits' bits.

    void addbits(uint Bits)

    {

      Bits+=InBit;

      InAddr+=Bits>>3;

      InBit=Bits&7;

    }

    // Return 16 bits from current position in the buffer.

    // Bit at (InAddr,InBit) has the highest position in returning data.

    uint getbits()

    {

      uint BitField=(uint)InBuf[InAddr] << 16;

      BitField|=(uint)InBuf[InAddr+1] << 8;

      BitField|=(uint)InBuf[InAddr+2];

      BitField >>= (8-InBit);

      return BitField & 0xffff;

    }

    // Return 32 bits from current position in the buffer.

    // Bit at (InAddr,InBit) has the highest position in returning data.

    uint getbits32()

    {

      uint BitField=(uint)InBuf[InAddr] << 24;

      BitField|=(uint)InBuf[InAddr+1] << 16;

      BitField|=(uint)InBuf[InAddr+2] << 8;

      BitField|=(uint)InBuf[InAddr+3];

      BitField <<= InBit;

      BitField|=(uint)InBuf[InAddr+4] >> (8-InBit);

      return BitField & 0xffffffff;

    }

    void faddbits(uint Bits);

    uint fgetbits();

    // Check if buffer has enough space for IncPtr bytes. Returns 'true'

    // if buffer will be overflown.

    bool Overflow(uint IncPtr) 

    {

      return InAddr+IncPtr>=MAX_SIZE;

    }

    void SetExternalBuffer(byte *Buf);

};

#endif