/***************************************************************************\  * *               (C) copyright Fraunhofer - IIS (1997) *                        All Rights Reserved * *   filename: bitstream.h *   project : MPEG Decoder *   author  : Martin Sieler *   date    : 1997-12-05 *   contents/description: generic bitbuffer - HEADER * *\***************************************************************************//* * $Date: 1998/12/18 17:23:43 $ * $Header: /home/cvs/mms/corelibs/mp3dec/bitstream.h,v 1.7 1998/12/18 17:23:43 sir Exp $ */#ifndef _BITSTREAM_H#define _BITSTREAM_H/* ------------------------ includes --------------------------------------*//*-------------------------- defines --------------------------------------*/class CGioBase;/*-------------------------------------------------------------------------*//* Bitstream input class.    This class defines the interface that the mp3 decoder object will    read all of its bitstream input data from.*/class CBitStream{public:  CBitStream(int cbSize);  CBitStream(unsigned char *pBuf, int cbSize, BOOL fDataValid = false);  virtual ~CBitStream();  virtual void   Reset();  void           Connect(CGioBase *_pGB);  void           ResetBitCnt()     { m_BitCnt = 0;    }  int            GetBitCnt() const { return m_BitCnt; }  unsigned int   GetBits(unsigned int nBits);  unsigned long  Get32Bits();  int            Ff(int nBits);  int            Rewind(int nBits);  int            Seek(int nBits)    {      m_BitCnt    += nBits;    m_ValidBits -= nBits;    m_BitNdx     = (m_BitNdx+nBits) & (m_nBits-1);    return 1;    }  int            GetValidBits() const { return m_ValidBits; }  int            GetFree()      const;  void           SetEof();  int            Fill(const unsigned char *pBuf, int cbSize);  int            Fill(CBitStream &Bs, int cbSize);protected:  int            Refill();  BOOL           IsEof()       const;  BOOL           IsConnected() const;private:  CGioBase      *m_pGB;           // I/O object  int            m_nBytes;        // size of buffer in bytes  int            m_nBits;         // size of buffer in bits  int            m_ValidBits;     // valid bits in buffer  int            m_ReadOffset;    // where to write next  int            m_BitCnt;        // bit counter  int            m_BitNdx;        // position of next bit in byte  BOOL           m_fEof;          // indication of input eof  unsigned char *m_Buf;           // the buffer  BOOL           m_fBufferIntern; // did we allocate the buffer ourselves};/*-------------------------------------------------------------------------*/#endif