diff -r 000000000000 -r 6474c204b198 modules/libjar/zipwriter/src/nsZipDataStream.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/zipwriter/src/nsZipDataStream.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,185 @@
+/* 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/.
+ */
+
+#include "StreamFunctions.h"
+#include "nsZipDataStream.h"
+#include "nsIStringStream.h"
+#include "nsISeekableStream.h"
+#include "nsDeflateConverter.h"
+#include "nsNetUtil.h"
+#include "nsComponentManagerUtils.h"
+#include "nsMemory.h"
+
+#define ZIP_METHOD_STORE 0
+#define ZIP_METHOD_DEFLATE 8
+
+/**
+ * nsZipDataStream handles the writing an entry's into the zip file.
+ * It is set up to wither write the data as is, or in the event that compression
+ * has been requested to pass it through a stream converter.
+ * Currently only the deflate compression method is supported.
+ * The CRC checksum for the entry's data is also generated here.
+ */
+NS_IMPL_ISUPPORTS(nsZipDataStream, nsIStreamListener,
+                  nsIRequestObserver)
+
+nsresult nsZipDataStream::Init(nsZipWriter *aWriter,
+                               nsIOutputStream *aStream,
+                               nsZipHeader *aHeader,
+                               int32_t aCompression)
+{
+    mWriter = aWriter;
+    mHeader = aHeader;
+    mStream = aStream;
+    mHeader->mCRC = crc32(0L, Z_NULL, 0);
+
+    nsresult rv = NS_NewSimpleStreamListener(getter_AddRefs(mOutput), aStream,
+                                             nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (aCompression > 0) {
+        mHeader->mMethod = ZIP_METHOD_DEFLATE;
+        nsCOMPtr<nsIStreamConverter> converter =
+                              new nsDeflateConverter(aCompression);
+        NS_ENSURE_TRUE(converter, NS_ERROR_OUT_OF_MEMORY);
+
+        rv = converter->AsyncConvertData("uncompressed", "rawdeflate", mOutput,
+                                         nullptr);
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        mOutput = do_QueryInterface(converter, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+    }
+    else {
+        mHeader->mMethod = ZIP_METHOD_STORE;
+    }
+
+    return NS_OK;
+}
+
+/* void onDataAvailable (in nsIRequest aRequest, in nsISupports aContext,
+ *                       in nsIInputStream aInputStream,
+ *                       in unsigned long long aOffset, in unsigned long aCount); */
+NS_IMETHODIMP nsZipDataStream::OnDataAvailable(nsIRequest *aRequest,
+                                               nsISupports *aContext,
+                                               nsIInputStream *aInputStream,
+                                               uint64_t aOffset,
+                                               uint32_t aCount)
+{
+    if (!mOutput)
+        return NS_ERROR_NOT_INITIALIZED;
+
+    nsAutoArrayPtr<char> buffer(new char[aCount]);
+    NS_ENSURE_TRUE(buffer, NS_ERROR_OUT_OF_MEMORY);
+
+    nsresult rv = ZW_ReadData(aInputStream, buffer.get(), aCount);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    return ProcessData(aRequest, aContext, buffer.get(), aOffset, aCount);
+}
+
+/* void onStartRequest (in nsIRequest aRequest, in nsISupports aContext); */
+NS_IMETHODIMP nsZipDataStream::OnStartRequest(nsIRequest *aRequest,
+                                              nsISupports *aContext)
+{
+    if (!mOutput)
+        return NS_ERROR_NOT_INITIALIZED;
+
+    return mOutput->OnStartRequest(aRequest, aContext);
+}
+
+/* void onStopRequest (in nsIRequest aRequest, in nsISupports aContext,
+ *                     in nsresult aStatusCode); */
+NS_IMETHODIMP nsZipDataStream::OnStopRequest(nsIRequest *aRequest,
+                                             nsISupports *aContext,
+                                             nsresult aStatusCode)
+{
+    if (!mOutput)
+        return NS_ERROR_NOT_INITIALIZED;
+
+    nsresult rv = mOutput->OnStopRequest(aRequest, aContext, aStatusCode);
+    mOutput = nullptr;
+    if (NS_FAILED(rv)) {
+        mWriter->EntryCompleteCallback(mHeader, rv);
+    }
+    else {
+        rv = CompleteEntry();
+        rv = mWriter->EntryCompleteCallback(mHeader, rv);
+    }
+
+    mStream = nullptr;
+    mWriter = nullptr;
+    mHeader = nullptr;
+
+    return rv;
+}
+
+inline nsresult nsZipDataStream::CompleteEntry()
+{
+    nsresult rv;
+    nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(mStream, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    int64_t pos;
+    rv = seekable->Tell(&pos);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mHeader->mCSize = pos - mHeader->mOffset - mHeader->GetFileHeaderLength();
+    mHeader->mWriteOnClose = true;
+    return NS_OK;
+}
+
+nsresult nsZipDataStream::ProcessData(nsIRequest *aRequest,
+                                      nsISupports *aContext, char *aBuffer,
+                                      uint64_t aOffset, uint32_t aCount)
+{
+    mHeader->mCRC = crc32(mHeader->mCRC,
+                          reinterpret_cast<const unsigned char*>(aBuffer),
+                          aCount);
+
+    nsresult rv;
+    nsCOMPtr<nsIStringInputStream> stream =
+             do_CreateInstance("@mozilla.org/io/string-input-stream;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    stream->ShareData(aBuffer, aCount);
+    rv = mOutput->OnDataAvailable(aRequest, aContext, stream, aOffset, aCount);
+    mHeader->mUSize += aCount;
+
+    return rv;
+}
+
+nsresult nsZipDataStream::ReadStream(nsIInputStream *aStream)
+{
+    if (!mOutput)
+        return NS_ERROR_NOT_INITIALIZED;
+
+    nsresult rv = OnStartRequest(nullptr, nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoArrayPtr<char> buffer(new char[4096]);
+    NS_ENSURE_TRUE(buffer, NS_ERROR_OUT_OF_MEMORY);
+
+    uint32_t read = 0;
+    uint32_t offset = 0;
+    do
+    {
+        rv = aStream->Read(buffer.get(), 4096, &read);
+        if (NS_FAILED(rv)) {
+            OnStopRequest(nullptr, nullptr, rv);
+            return rv;
+        }
+
+        if (read > 0) {
+            rv = ProcessData(nullptr, nullptr, buffer.get(), offset, read);
+            if (NS_FAILED(rv)) {
+                OnStopRequest(nullptr, nullptr, rv);
+                return rv;
+            }
+            offset += read;
+        }
+    } while (read > 0);
+
+    return OnStopRequest(nullptr, nullptr, NS_OK);
+}