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diff --git a/examples/qpack_decode.h b/examples/qpack_decode.h
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+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef QPACK_DECODE_H
+#define QPACK_DECODE_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <nghttp3/nghttp3.h>
+
+#include <vector>
+#include <queue>
+#include <functional>
+#include <utility>
+#include <memory>
+#include <string>
+
+namespace nghttp3 {
+struct Request {
+  Request(int64_t stream_id, const nghttp3_buf *buf);
+  ~Request();
+
+  nghttp3_buf buf;
+  nghttp3_qpack_stream_context *sctx;
+  int64_t stream_id;
+};
+} // namespace nghttp3
+
+namespace std {
+template <> struct greater<std::shared_ptr<nghttp3::Request>> {
+  bool operator()(const std::shared_ptr<nghttp3::Request> &lhs,
+                  const std::shared_ptr<nghttp3::Request> &rhs) const {
+    return nghttp3_qpack_stream_context_get_ricnt(lhs->sctx) >
+           nghttp3_qpack_stream_context_get_ricnt(rhs->sctx);
+  }
+};
+} // namespace std
+
+namespace nghttp3 {
+
+using Headers = std::vector<std::pair<std::string, std::string>>;
+
+class Decoder {
+public:
+  Decoder(size_t max_dtable_size, size_t max_blocked);
+  ~Decoder();
+
+  int init();
+  int read_encoder(nghttp3_buf *buf);
+  std::tuple<Headers, int> read_request(nghttp3_buf *buf, int64_t stream_id);
+  std::tuple<Headers, int> read_request(Request &req);
+  std::tuple<int64_t, Headers, int> process_blocked();
+  size_t get_num_blocked() const;
+
+private:
+  const nghttp3_mem *mem_;
+  nghttp3_qpack_decoder *dec_;
+  std::priority_queue<std::shared_ptr<Request>,
+                      std::vector<std::shared_ptr<Request>>,
+                      std::greater<std::shared_ptr<Request>>>
+      blocked_reqs_;
+  size_t max_dtable_size_;
+  size_t max_blocked_;
+};
+
+int decode(const std::string_view &outfile, const std::string_view &infile);
+
+} // namespace nghttp3
+
+#endif // QPACK_ENCODE_H