diff -r 000000000000 -r 6474c204b198 modules/libjar/zipwriter/src/nsDeflateConverter.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/zipwriter/src/nsDeflateConverter.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef _nsDeflateConverter_h_
+#define _nsDeflateConverter_h_
+
+#include "nsIStreamConverter.h"
+#include "nsCOMPtr.h"
+#include "nsIPipe.h"
+#include "zlib.h"
+#include "mozilla/Attributes.h"
+
+#define DEFLATECONVERTER_CID { 0x461cd5dd, 0x73c6, 0x47a4, \
+           { 0x8c, 0xc3, 0x60, 0x3b, 0x37, 0xd8, 0x4a, 0x61 } }
+
+#define ZIP_BUFLEN (4 * 1024 - 1)
+
+class nsDeflateConverter MOZ_FINAL : public nsIStreamConverter
+{
+public:
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIREQUESTOBSERVER
+    NS_DECL_NSISTREAMLISTENER
+    NS_DECL_NSISTREAMCONVERTER
+
+    nsDeflateConverter()
+    {
+        // 6 is Z_DEFAULT_COMPRESSION but we need the actual value
+        mLevel = 6;
+    }
+
+    nsDeflateConverter(int32_t level)
+    {
+        mLevel = level;
+    }
+
+private:
+
+    ~nsDeflateConverter()
+    {
+    }
+    
+    enum WrapMode {
+        WRAP_ZLIB,
+        WRAP_GZIP,
+        WRAP_NONE
+    };
+
+    WrapMode mWrapMode;
+    uint64_t mOffset;
+    int32_t mLevel;
+    nsCOMPtr<nsIStreamListener> mListener;
+    nsCOMPtr<nsISupports> mContext;
+    z_stream mZstream;
+    unsigned char mWriteBuffer[ZIP_BUFLEN];
+
+    nsresult Init();
+    nsresult PushAvailableData(nsIRequest *aRequest, nsISupports *aContext);
+};
+
+#endif