gcc/libjava/java/io/DataOutputStream.java

// DataOutputStream.java - Output filter that implements DataOutput

/* 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 DataOutputStream extends FilterOutputStream implements DataOutput
{
  public DataOutputStream (OutputStream out)
  {
    super (out);
    written = 0;
  }

  public void flush () throws IOException
  {
    out.flush();
  }

  public final int size ()
  {
    return written;
  }

  public synchronized void write (int b) throws IOException
  {
    out.write(b);
    ++written;
  }

  public synchronized void write (byte[] b, int off, int len)
    throws IOException, NullPointerException, IndexOutOfBoundsException
  {
    out.write(b, off, len);
    written += len - off;
  }

  public final void writeBoolean (boolean v) throws IOException
  {
    write (v ? 1 : 0);
  }

  public final void writeByte (int v) throws IOException
  {
    write (v & 0xff);
  }

  public final void writeShort (int v) throws IOException
  {
    write ((byte) (0xff & (v >> 8)));
    write ((byte) (0xff & v));
  }

  public final void writeChar (int v) throws IOException
  {
    write ((byte) (0xff & (v >> 8)));
    write ((byte) (0xff & v));
  }

  public final void writeInt (int v) throws IOException
  {
    write ((byte) (0xff & (v >> 24)));
    write ((byte) (0xff & (v >> 16)));
    write ((byte) (0xff & (v >>  8)));
    write ((byte) (0xff & v));
  }

  public final void writeLong (long v) throws IOException
  {
    write ((byte) (0xff & (v >> 56)));
    write ((byte) (0xff & (v >> 48)));
    write ((byte) (0xff & (v >> 40)));
    write ((byte) (0xff & (v >> 32)));
    write ((byte) (0xff & (v >> 24)));
    write ((byte) (0xff & (v >> 16)));
    write ((byte) (0xff & (v >>  8)));
    write ((byte) (0xff & v));
  }

  public final void writeFloat (float v) throws IOException
  {
    writeInt (Float.floatToIntBits(v));
  }

  public final void writeDouble (double v) throws IOException
  {
    writeLong (Double.doubleToLongBits(v));
  }

  public final void writeBytes (String s) throws IOException
  {
    int len = s.length();
    for (int i = 0; i < len; ++i)
      writeByte (s.charAt(i));
  }

  public final void writeChars (String s) throws IOException
  {
    int len = s.length();
    for (int i = 0; i < len; ++i)
      writeChar (s.charAt(i));
  }

  public final void writeUTF (String s) throws IOException
  {
    int len = s.length();
    int sum = 0;

    for (int i = 0; i < len && sum <= 65535; ++i)
      {
	char c = s.charAt(i);
	if (c >= '\u0001' && c <= '\u007f')
	  sum += 1;
	else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
	  sum += 2;
	else
	  sum += 3;
      }

    if (sum > 65535)
      throw new UTFDataFormatException ();

    writeShort (sum);

    for (int i = 0; i < len; ++i)
      {
	char c = s.charAt(i);
	if (c >= '\u0001' && c <= '\u007f')
	  write (c);
	else if (c == '\u0000' || (c >= '\u0080' && c <= '\u07ff'))
	  {
	    write (0xc0 | (0x1f & (c >> 6)));
	    write (0x80 | (0x3f & c));
	  }
	else
	  {
	    // JSL says the first byte should be or'd with 0xc0, but
	    // that is a typo.  Unicode says 0xe0, and that is what is
	    // consistent with DataInputStream.
	    write (0xe0 | (0x0f & (c >> 12)));
	    write (0x80 | (0x3f & (c >> 6)));
	    write (0x80 | (0x3f & c));
	  }
      }
  }

  // Number of bytes written so far.
  protected int written;
}