including jazzlib into classpath tree

1 files changed, 141 insertions, 0 deletions

diff --git a/java/util/zip/GZIPOutputStream.java b/java/util/zip/GZIPOutputStream.java
new file mode 100644
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+++ b/java/util/zip/GZIPOutputStream.java
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+/* java.util.zip.GZIPOutputStream
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+This file is part of Jazzlib.
+
+Jazzlib 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.
+
+Jazzlib 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.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+package java.util.zip;
+
+import java.io.OutputStream;
+import java.io.IOException;
+
+
+/**
+ * This filter stream is used to compress a stream into a "GZIP" stream. 
+ * The "GZIP" format is described in RFC 1952.
+ *
+ * @author John Leuner
+ * @since JDK 1.1
+ */
+
+
+public class GZIPOutputStream extends DeflaterOutputStream implements GZIPConstants {
+
+  //Variables
+
+  /* CRC-32 value for uncompressed data
+   */
+  
+  protected CRC32 crc = new CRC32(); 
+
+  // Constructors
+
+  /* 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);
+    
+    int mod_time = (int) (System.currentTimeMillis() / 1000L);
+    byte[] gzipHeader =
+      {
+	/* The two magic bytes */
+	(byte) (GZIP_MAGIC >> 8), (byte) GZIP_MAGIC,
+	  
+	/* 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 void write(byte[] buf, int off, int len) throws IOException
+  {
+    crc.update(buf, off, len);
+    super.write(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 )");    
+  }
+}