// BufferedOutputStream.java - A buffered stream

/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.io;

/**
 * @author Tom Tromey <tromey@cygnus.com>
 * @date September 24, 1998 
 */

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * Status:  Complete to version 1.1.
 */

public class BufferedOutputStream extends FilterOutputStream
{
  public BufferedOutputStream (OutputStream ox)
  {
    this (ox, 512);
  }

  public BufferedOutputStream (OutputStream ox, int size)
  {
    super (ox);
    buf = new byte[size];
  }

  public synchronized void flush () throws IOException
  {
    out.write(buf, 0, count);
    count = 0;
    out.flush();
  }

  public synchronized void write (int b) throws IOException
  {
    // Flush output on overflow though JDK (1.2) doc may infer to flush on fill.
    if (count < buf.length)
      buf[count++] = (byte) b;
    else
      {
	out.write(buf, 0, count);
	count = 0;
	out.write(b);
      }
  }

  public synchronized void write (byte[] b, int off, int len)
    throws IOException, NullPointerException, IndexOutOfBoundsException
  {
    // Flush output on overflow though JDK (1.2) doc may infer to flush on fill.

    // If LEN < 0 then the downstream write will fail for us.
    if (len >= 0 && count + len <= buf.length)
      {
	System.arraycopy(b, off, buf, count, len);
	count += len;
      }
    else
      {
	out.write(buf, 0, count);
	count = 0;
	out.write(b, off, len);
      }
  }

  // The buffer.
  protected byte[] buf;
  // Number of valid bytes in BUF.
  protected int count;
}
