import java.io.*;
/**
 * Classe permettant l'écritre dans un flot bit à bit
 * @author Forax for ever
 * @version 1.0
 */

public class BitOutputStream extends FilterOutputStream {
  int bits;
  int offset;
  
  public BitOutputStream(OutputStream out) {
    super(out);
  }
/**
 * Writes the specified bit to this output stream. 
 @param bit - the bit
 */
  public void writeBit(int bit) throws IOException {
    if (bit==0) {
      bits<<=1;
    }
    else {
      bits=bits<<1|1;
    }
    offset++;
    if (offset==8) {
      write(bits);
      bits=0;
      offset=0;
    }
  }
  
  /** flush the output stream.
   */
  public void flush() throws IOException {
    if (offset!=0) {
      write(bits<<(8-offset));
      offset=0;
    }
    super.flush();
  }
  /** close  the output stream.
   */
  public void close() throws IOException {
    flush();
    super.close();
  }
}