1 files changed, 59 insertions, 0 deletions
diff --git a/modules/libjar/zipwriter/nsDeflateConverter.h b/modules/libjar/zipwriter/nsDeflateConverter.h
new file mode 100644
index 0000000000..1728038abb
--- /dev/null
+++ b/modules/libjar/zipwriter/nsDeflateConverter.h
@@ -0,0 +1,59 @@
+/* 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 "nsIThreadRetargetableStreamListener.h"
+#include "zlib.h"
+#include "mozilla/Attributes.h"
+
+#define DEFLATECONVERTER_CID                         \
+  {                                                  \
+    0x461cd5dd, 0x73c6, 0x47a4, {                    \
+      0x8c, 0xc3, 0x60, 0x3b, 0x37, 0xd8, 0x4a, 0x61 \
+    }                                                \
+  }
+
+class nsDeflateConverter final : public nsIStreamConverter {
+ public:
+  static constexpr size_t kZipBufLen = (4 * 1024 - 1);
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+  NS_DECL_NSITHREADRETARGETABLESTREAMLISTENER
+  NS_DECL_NSISTREAMCONVERTER
+
+  nsDeflateConverter() : mWrapMode(WRAP_NONE), mOffset(0), mZstream() {
+    // 6 is Z_DEFAULT_COMPRESSION but we need the actual value
+    mLevel = 6;
+  }
+
+  explicit nsDeflateConverter(int32_t level)
+      : mWrapMode(WRAP_NONE), mOffset(0), mZstream() {
+    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[kZipBufLen];
+
+  nsresult Init();
+  nsresult PushAvailableData(nsIRequest* aRequest);
+};
+
+#endif