--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/jcraft/jzlib/GZIPInputStream.java	Fri Aug 01 13:34:58 2014 -0700
@@ -0,0 +1,145 @@
+/* -*-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 GZIPInputStream extends InflaterInputStream {
+
+  public GZIPInputStream(InputStream in) throws IOException {
+    this(in, DEFAULT_BUFSIZE, true);
+  }
+
+  public GZIPInputStream(InputStream in,
+                         int size,
+                         boolean close_in) throws IOException {
+    this(in, new Inflater(15+16), size, close_in);
+    myinflater = true;
+  }
+
+  public GZIPInputStream(InputStream in, 
+                         Inflater inflater,
+                         int size,
+                         boolean close_in) throws IOException {
+    super(in, inflater, size, close_in);
+  }
+
+  public long getModifiedtime() {
+    return inflater.istate.getGZIPHeader().getModifiedTime();
+  }
+
+  public int getOS() {
+    return inflater.istate.getGZIPHeader().getOS();
+  }
+
+  public String getName() {
+    return inflater.istate.getGZIPHeader().getName();
+  }
+
+  public String getComment() {
+    return inflater.istate.getGZIPHeader().getComment();
+  }
+
+  public long getCRC() throws GZIPException {
+    if(inflater.istate.mode != 12 /*DONE*/)
+      throw new GZIPException("checksum is not calculated yet.");
+    return inflater.istate.getGZIPHeader().getCRC();
+  }
+
+  public void readHeader() throws IOException {
+
+    byte[] empty = "".getBytes();
+    inflater.setOutput(empty, 0, 0);
+    inflater.setInput(empty, 0, 0, false);
+
+    byte[] b = new byte[10];
+
+    int n = fill(b);
+    if(n!=10){
+      if(n>0){
+        inflater.setInput(b, 0, n, false);
+        //inflater.next_in_index = n;
+        inflater.next_in_index = 0;
+        inflater.avail_in = n;
+      }
+      throw new IOException("no input");
+    }
+
+    inflater.setInput(b, 0, n, false);
+
+    byte[] b1 = new byte[1];
+    do{
+      if(inflater.avail_in<=0){
+        int i = in.read(b1);
+        if(i<=0)
+          throw new IOException("no input");
+        inflater.setInput(b1, 0, 1, true);
+      }
+
+      int err = inflater.inflate(JZlib.Z_NO_FLUSH);
+
+      if(err!=0/*Z_OK*/){
+        int len = 2048-inflater.next_in.length;
+        if(len>0){
+          byte[] tmp = new byte[len];
+          n = fill(tmp);
+          if(n>0){
+            inflater.avail_in += inflater.next_in_index;
+            inflater.next_in_index = 0;
+            inflater.setInput(tmp, 0, n, true);
+          }
+        }
+        //inflater.next_in_index = inflater.next_in.length;
+        inflater.avail_in += inflater.next_in_index;
+        inflater.next_in_index = 0;
+        throw new IOException(inflater.msg);
+      }
+    }
+    while(inflater.istate.inParsingHeader());
+  }
+
+  private int fill(byte[] buf) {
+    int len = buf.length;
+    int n = 0;
+    do{
+      int i = -1;
+      try {
+        i = in.read(buf, n, buf.length - n);
+      }
+      catch(IOException e){
+      }
+      if(i == -1){
+        break;
+      }
+      n+=i;
+    }
+    while(n<len);
+    return n;
+  }
+}
\ No newline at end of file