#ifndef __bufio_h
#define __bufio_h
#pragma interface

class bufio {
  long bufpos;	// file position of buffer
  long tmpsize;	// bytes saved in backing store
  char *buf;	// buffer
  int fd;	// os file descriptor
  int tfd;	// temporary file for backing pipe input
  int bufsize;	// size of buffer
  int bufcnt;	// bytes currently in buffer
  int sectsize;	// file position alignment required
  int curpos;	// buffer position of current object
  int cursize;	// size of current object
  bufio(const bufio &);
  bufio&operator=(const bufio &);
public:
  long seek(long pos);
  bufio(int f,int bufsize = 8192,int sect = 512);
  void *read(long pos,int size);	// read random object
  void *read(int size);			// read next object
  long getpos() const { return bufpos + curpos + cursize; }
  int  getcnt() const { return bufcnt - curpos - cursize; }
  int getfd() const { return fd; }
  int canSeek() const { return tfd == fd; }
  void setSequential();			// do not try to seek
  void update();			// mark current object updated
  ~bufio();
};
#endif