94 lines
1.9 KiB
Java
94 lines
1.9 KiB
Java
// GZIPOutputStream.java - Create a file in gzip format.
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/* Copyright (C) 1999 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.util.zip;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* @author Tom Tromey
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* @date May 17, 1999
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*/
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/* Written using on-line Java Platform 1.2 API Specification
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* and JCL book.
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* Believed complete and correct.
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*/
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public class GZIPOutputStream extends DeflaterOutputStream
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{
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public void close () throws IOException
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{
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finish ();
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out.close ();
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}
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public void finish () throws IOException
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{
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super.finish();
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put4 ((int) crc.getValue());
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put4 (def.getTotalIn());
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}
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public GZIPOutputStream (OutputStream out) throws IOException
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{
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this (out, 512);
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}
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public GZIPOutputStream (OutputStream out, int readsize) throws IOException
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{
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super (out, new Deflater (Deflater.DEFAULT_COMPRESSION, true), readsize);
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put2 (GZIPInputStream.GZIP_MAGIC);
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out.write (GZIPInputStream.Z_DEFLATED);
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// No flags for now.
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out.write (0);
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// No time either.
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put2 (0);
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put2 (0);
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// No xflags either.
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out.write (0);
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// FIXME: unknown OS.
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out.write (255);
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crc = new CRC32 ();
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}
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public synchronized void write (byte[] buf) throws IOException
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{
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write (buf, 0, buf.length);
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}
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public synchronized void write (byte[] buf, int off, int len)
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throws IOException
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{
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super.write(buf, off, len);
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crc.update(buf, off, len);
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}
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private final void put2 (int i) throws IOException
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{
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out.write (i);
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out.write (i >> 8);
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}
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private final void put4 (int i) throws IOException
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{
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out.write (i);
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out.write (i >> 8);
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out.write (i >> 16);
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out.write (i >> 24);
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}
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// Checksum used by this stream.
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protected CRC32 crc;
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}
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