image/bitstrm.h

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#ifndef           BITSTRM_H
#define           BITSTRM_H

#include          "host.h"

#define BITBUFSIZE      8192

class DLLSYM R_BITSTREAM
{
  private:
    int bitfd;                   //file descriptor
    INT32 bitindex;              //current byte
    UINT32 bitword;              //current word
    INT32 bitbit;                //current bit
    INT32 bufsize;               //size of buffer
    UINT8 bitbuf[BITBUFSIZE];    //bitstream buffer
                                 //for reading codes
    static const UINT16 bitmasks[17];

  public:

    R_BITSTREAM() { 
    };                           //Null constructor

    UINT16 open(          //open to read
                int fd);  //file to read

    UINT16 read_code(                //read a code
                     UINT8 length);  //bits to lose
    UINT16 masks(               //read a code
                 INT32 index);  //bits to lose
};

class DLLSYM W_BITSTREAM
{
  private:
    int bitfd;
    INT32 bitindex;
    UINT32 bitword;
    INT32 bitbit;
    UINT8 bitbuf[BITBUFSIZE];

  public:
    W_BITSTREAM() { 
    };                           //Null constructor

    void open(          //open to write
              int fd);  //file to write

    INT8 write_code(                //write a code
                    UINT16 code,    //code to write
                    UINT8 length);  //bits to lose
};
#endif

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