--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/util/zip/GZIPOutputStream.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,169 @@
+/*
+ * Copyright 1996-2002 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.util.zip;
+
+import java.io.OutputStream;
+import java.io.IOException;
+
+/**
+ * This class implements a stream filter for writing compressed data in
+ * the GZIP file format.
+ * @author David Connelly
+ *
+ */
+public
+class GZIPOutputStream extends DeflaterOutputStream {
+ /**
+ * CRC-32 of uncompressed data.
+ */
+ protected CRC32 crc = new CRC32();
+
+ /*
+ * GZIP header magic number.
+ */
+ private final static int GZIP_MAGIC = 0x8b1f;
+
+ /*
+ * Trailer size in bytes.
+ *
+ */
+ private final static int TRAILER_SIZE = 8;
+
+ /**
+ * Creates a new output stream with the specified buffer size.
+ * @param out the output stream
+ * @param size the output buffer size
+ * @exception IOException If an I/O error has occurred.
+ * @exception IllegalArgumentException if size is <= 0
+ */
+ public GZIPOutputStream(OutputStream out, int size) throws IOException {
+ super(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true), size);
+ usesDefaultDeflater = true;
+ writeHeader();
+ crc.reset();
+ }
+
+ /**
+ * Creates a new output stream with a default buffer size.
+ * @param out the output stream
+ * @exception IOException If an I/O error has occurred.
+ */
+ public GZIPOutputStream(OutputStream out) throws IOException {
+ this(out, 512);
+ }
+
+ /**
+ * Writes array of bytes to the compressed output stream. This method
+ * will block until all the bytes are written.
+ * @param buf the data to be written
+ * @param off the start offset of the data
+ * @param len the length of the data
+ * @exception IOException If an I/O error has occurred.
+ */
+ public synchronized void write(byte[] buf, int off, int len)
+ throws IOException
+ {
+ super.write(buf, off, len);
+ crc.update(buf, off, len);
+ }
+
+ /**
+ * Finishes writing compressed data to the output stream without closing
+ * the underlying stream. Use this method when applying multiple filters
+ * in succession to the same output stream.
+ * @exception IOException if an I/O error has occurred
+ */
+ public void finish() throws IOException {
+ if (!def.finished()) {
+ def.finish();
+ while (!def.finished()) {
+ int len = def.deflate(buf, 0, buf.length);
+ if (def.finished() && len <= buf.length - TRAILER_SIZE) {
+ // last deflater buffer. Fit trailer at the end
+ writeTrailer(buf, len);
+ len = len + TRAILER_SIZE;
+ out.write(buf, 0, len);
+ return;
+ }
+ if (len > 0)
+ out.write(buf, 0, len);
+ }
+ // if we can't fit the trailer at the end of the last
+ // deflater buffer, we write it separately
+ byte[] trailer = new byte[TRAILER_SIZE];
+ writeTrailer(trailer, 0);
+ out.write(trailer);
+ }
+ }
+
+ /*
+ * Writes GZIP member header.
+ */
+
+ private final static byte[] header = {
+ (byte) GZIP_MAGIC, // Magic number (short)
+ (byte)(GZIP_MAGIC >> 8), // Magic number (short)
+ Deflater.DEFLATED, // Compression method (CM)
+ 0, // Flags (FLG)
+ 0, // Modification time MTIME (int)
+ 0, // Modification time MTIME (int)
+ 0, // Modification time MTIME (int)
+ 0, // Modification time MTIME (int)
+ 0, // Extra flags (XFLG)
+ 0 // Operating system (OS)
+ };
+
+ private void writeHeader() throws IOException {
+ out.write(header);
+ }
+
+ /*
+ * Writes GZIP member trailer to a byte array, starting at a given
+ * offset.
+ */
+ private void writeTrailer(byte[] buf, int offset) throws IOException {
+ writeInt((int)crc.getValue(), buf, offset); // CRC-32 of uncompr. data
+ writeInt(def.getTotalIn(), buf, offset + 4); // Number of uncompr. bytes
+ }
+
+ /*
+ * Writes integer in Intel byte order to a byte array, starting at a
+ * given offset.
+ */
+ private void writeInt(int i, byte[] buf, int offset) throws IOException {
+ writeShort(i & 0xffff, buf, offset);
+ writeShort((i >> 16) & 0xffff, buf, offset + 2);
+ }
+
+ /*
+ * Writes short integer in Intel byte order to a byte array, starting
+ * at a given offset
+ */
+ private void writeShort(int s, byte[] buf, int offset) throws IOException {
+ buf[offset] = (byte)(s & 0xff);
+ buf[offset + 1] = (byte)((s >> 8) & 0xff);
+ }
+}