1 files changed, 39 insertions, 0 deletions
diff --git a/toolkit/components/url-classifier/RiceDeltaDecoder.h b/toolkit/components/url-classifier/RiceDeltaDecoder.h
new file mode 100644
index 000000000..cf87cea88
--- /dev/null
+++ b/toolkit/components/url-classifier/RiceDeltaDecoder.h
@@ -0,0 +1,39 @@
+/* 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 RICE_DELTA_DECODER_H
+#define RICE_DELTA_DECODER_H
+
+namespace mozilla {
+namespace safebrowsing {
+
+class RiceDeltaDecoder {
+public:
+  // This decoder is tailored for safebrowsing v4, including the
+  // bit reading order and how the remainder part is interpreted.
+  // The caller just needs to feed the byte stream received from
+  // network directly. Note that the input buffer must be mutable
+  // since the decoder will do some pre-processing before decoding.
+  RiceDeltaDecoder(uint8_t* aEncodedData, size_t aEncodedDataSize);
+
+  // @param aNumEntries The number of values to be decoded, not including
+  //                    the first value.
+  // @param aDecodedData A pre-allocated output buffer. Note that
+  //                     aDecodedData[0] will be filled with |aFirstValue|
+  //                     and the buffer length (in byte) should be
+  //                     ((aNumEntries + 1) * sizeof(uint32_t)).
+  bool Decode(uint32_t aRiceParameter,
+              uint32_t aFirstValue,
+              uint32_t aNumEntries,
+              uint32_t* aDecodedData);
+
+private:
+  uint8_t* mEncodedData;
+  size_t mEncodedDataSize;
+};
+
+} // namespace safebrowsing
+} // namespace mozilla
+
+#endif  // UPDATE_V4_DECODER_H