--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/com/jcraft/jzlib/GZIPOutputStream.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,90 @@
+/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
+/*
+Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  1. Redistributions of source code must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+
+  2. Redistributions in binary form must reproduce the above copyright 
+     notice, this list of conditions and the following disclaimer in 
+     the documentation and/or other materials provided with the distribution.
+
+  3. The names of the authors may not be used to endorse or promote products
+     derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
+INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package com.jcraft.jzlib;
+import java.io.*;
+
+public class GZIPOutputStream extends DeflaterOutputStream {
+
+  public GZIPOutputStream(OutputStream out) throws IOException {
+    this(out, DEFAULT_BUFSIZE);
+  }
+
+  public GZIPOutputStream(OutputStream out, int size) throws IOException {
+    this(out, size, true);
+  }
+
+  public GZIPOutputStream(OutputStream out, 
+                          int size,
+                          boolean close_out) throws IOException {
+    this(out,
+         new Deflater(JZlib.Z_DEFAULT_COMPRESSION, 15+16),
+         size, close_out);
+    mydeflater=true; 
+  }
+
+  public GZIPOutputStream(OutputStream out, 
+                          Deflater deflater,
+                          int size,
+                          boolean close_out) throws IOException{
+    super(out, deflater, size, close_out);
+  }
+
+
+  private void check() throws GZIPException {
+    if(deflater.dstate.status != 42 /*INIT_STATUS*/)
+      throw new GZIPException("header is already written.");
+  }
+
+  public void setModifiedTime(long mtime) throws GZIPException {
+    check();
+    deflater.dstate.getGZIPHeader().setModifiedTime(mtime);
+  }
+
+  public void setOS(int os) throws GZIPException {
+    check();
+    deflater.dstate.getGZIPHeader().setOS(os);
+  }
+
+  public void setName(String name) throws GZIPException {
+    check();
+    deflater.dstate.getGZIPHeader().setName(name);
+  }
+
+  public void setComment(String comment) throws GZIPException {
+    check();
+    deflater.dstate.getGZIPHeader().setComment(comment);
+  }
+
+  public long getCRC() throws GZIPException {
+    if(deflater.dstate.status != 666 /*FINISH_STATE*/)
+      throw new GZIPException("checksum is not calculated yet.");
+    return deflater.dstate.getGZIPHeader().getCRC();
+  }
+}