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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/util/zip/GZIPOutputStream.java
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+/* 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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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;
+
+/**
+ * This filter stream is used to compress a stream into a "GZIP" stream.
+ * The "GZIP" format is described in RFC 1952.
+ *
+ * @author John Leuner
+ * @author Tom Tromey
+ * @since JDK 1.1
+ */
+
+/* Written using on-line Java Platform 1.2 API Specification
+ * and JCL book.
+ * Believed complete and correct.
+ */
+
+public class GZIPOutputStream extends DeflaterOutputStream
+{
+ /**
+ * CRC-32 value for uncompressed data
+ */
+ protected CRC32 crc;
+
+ /**
+ * Creates a GZIPOutputStream with the default buffer size
+ *
+ * @param out The stream to read data (to be compressed) from
+ *
+ */
+ public GZIPOutputStream(OutputStream out) throws IOException
+ {
+ this(out, 4096);
+ }
+
+ /**
+ * Creates a GZIPOutputStream with the specified buffer size
+ *
+ * @param out The stream to read compressed data from
+ * @param size Size of the buffer to use
+ */
+ public GZIPOutputStream(OutputStream out, int size) throws IOException
+ {
+ super(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true), size);
+ crc = new CRC32();
+ int mod_time = (int) (System.currentTimeMillis() / 1000L);
+ byte[] gzipHeader =
+ {
+ /* The two magic bytes */
+ (byte) GZIPInputStream.GZIP_MAGIC,
+ (byte) (GZIPInputStream.GZIP_MAGIC >> 8),
+
+ /* The compression type */
+ (byte) Deflater.DEFLATED,
+
+ /* The flags (not set) */
+ 0,
+
+ /* The modification time */
+ (byte) mod_time, (byte) (mod_time >> 8),
+ (byte) (mod_time >> 16), (byte) (mod_time >> 24),
+
+ /* The extra flags */
+ 0,
+
+ /* The OS type (unknown) */
+ (byte) 255
+ };
+
+ out.write(gzipHeader);
+ // System.err.println("wrote GZIP header (" + gzipHeader.length + " bytes )");
+ }
+
+ public synchronized void write(byte[] buf, int off, int len)
+ throws IOException
+ {
+ super.write(buf, off, len);
+ crc.update(buf, off, len);
+ }
+
+ /**
+ * Writes remaining compressed output data to the output stream
+ * and closes it.
+ */
+ public void close() throws IOException
+ {
+ finish();
+ out.close();
+ }
+
+ public void finish() throws IOException
+ {
+ super.finish();
+
+ int totalin = def.getTotalIn();
+ int crcval = (int) (crc.getValue() & 0xffffffff);
+
+ // System.err.println("CRC val is " + Integer.toHexString( crcval ) + " and length " + Integer.toHexString(totalin));
+
+ byte[] gzipFooter =
+ {
+ (byte) crcval, (byte) (crcval >> 8),
+ (byte) (crcval >> 16), (byte) (crcval >> 24),
+
+ (byte) totalin, (byte) (totalin >> 8),
+ (byte) (totalin >> 16), (byte) (totalin >> 24)
+ };
+
+ out.write(gzipFooter);
+ // System.err.println("wrote GZIP trailer (" + gzipFooter.length + " bytes )");
+ }
+}