mirror of git://gcc.gnu.org/git/gcc.git
127 lines
3.5 KiB
Java
127 lines
3.5 KiB
Java
/* GZIPOutputStream.java - Create a file in gzip format
|
|
Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
package java.util.zip;
|
|
|
|
import java.io.IOException;
|
|
import java.io.OutputStream;
|
|
|
|
/**
|
|
* @author Tom Tromey
|
|
* @date May 17, 1999
|
|
*/
|
|
|
|
/* Written using on-line Java Platform 1.2 API Specification
|
|
* and JCL book.
|
|
* Believed complete and correct.
|
|
*/
|
|
|
|
public class GZIPOutputStream extends DeflaterOutputStream
|
|
{
|
|
public void close () throws IOException
|
|
{
|
|
finish ();
|
|
out.close ();
|
|
}
|
|
|
|
public void finish () throws IOException
|
|
{
|
|
super.finish();
|
|
put4 ((int) crc.getValue());
|
|
put4 (def.getTotalIn());
|
|
}
|
|
|
|
public GZIPOutputStream (OutputStream out) throws IOException
|
|
{
|
|
this (out, 512);
|
|
}
|
|
|
|
public GZIPOutputStream (OutputStream out, int readsize) throws IOException
|
|
{
|
|
super (out, new Deflater (Deflater.DEFAULT_COMPRESSION, true), readsize);
|
|
|
|
put2 (GZIPInputStream.GZIP_MAGIC);
|
|
out.write (GZIPInputStream.Z_DEFLATED);
|
|
// No flags for now.
|
|
out.write (0);
|
|
// No time either.
|
|
put2 (0);
|
|
put2 (0);
|
|
// No xflags either.
|
|
out.write (0);
|
|
// FIXME: unknown OS.
|
|
out.write (255);
|
|
|
|
crc = new CRC32 ();
|
|
}
|
|
|
|
public synchronized void write (int bval) throws IOException
|
|
{
|
|
super.write (bval);
|
|
crc.update (bval);
|
|
}
|
|
|
|
public synchronized void write (byte[] buf) throws IOException
|
|
{
|
|
write (buf, 0, buf.length);
|
|
}
|
|
|
|
public synchronized void write (byte[] buf, int off, int len)
|
|
throws IOException
|
|
{
|
|
super.write(buf, off, len);
|
|
crc.update(buf, off, len);
|
|
}
|
|
|
|
private final void put2 (int i) throws IOException
|
|
{
|
|
out.write (i);
|
|
out.write (i >> 8);
|
|
}
|
|
|
|
private final void put4 (int i) throws IOException
|
|
{
|
|
out.write (i);
|
|
out.write (i >> 8);
|
|
out.write (i >> 16);
|
|
out.write (i >> 24);
|
|
}
|
|
|
|
// Checksum used by this stream.
|
|
protected CRC32 crc;
|
|
}
|