1 files changed, 88 insertions, 0 deletions
diff --git a/libjava/java/util/zip/GZIPOutputStream.java b/libjava/java/util/zip/GZIPOutputStream.java
new file mode 100644
index 00000000000..1d93fd17d0c
--- /dev/null
+++ b/libjava/java/util/zip/GZIPOutputStream.java
@@ -0,0 +1,88 @@
+// GZIPOutputStream.java - Create a file in gzip format.
+
+/* Copyright (C) 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+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 (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;
+}