Add new HTTP/2 and HPACK decoder in net/http2/.

net/http2/decoder/payload_decoders/push_promise_payload_decoder.h

Index: net/http2/decoder/payload_decoders/push_promise_payload_decoder.h
diff --git a/net/http2/decoder/payload_decoders/push_promise_payload_decoder.h b/net/http2/decoder/payload_decoders/push_promise_payload_decoder.h
new file mode 100644
index 0000000000000000000000000000000000000000..fe6c52327ddf0d72fc4cd3ea5a04728000b7617d
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+++ b/net/http2/decoder/payload_decoders/push_promise_payload_decoder.h
@@ -0,0 +1,66 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_HTTP2_DECODER_PAYLOAD_DECODERS_PUSH_PROMISE_PAYLOAD_DECODER_H_
+#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_PUSH_PROMISE_PAYLOAD_DECODER_H_
+
+// Decodes the payload of a PUSH_PROMISE frame.
+
+#include "net/base/net_export.h"
+#include "net/http2/decoder/decode_buffer.h"
+#include "net/http2/decoder/decode_status.h"
+#include "net/http2/decoder/frame_decoder_state.h"
+#include "net/http2/http2_structures.h"
+
+namespace net {
+namespace test {
+class PushPromisePayloadDecoderPeer;
+}  // namespace test
+
+class NET_EXPORT_PRIVATE PushPromisePayloadDecoder {
+ public:
+  // States during decoding of a PUSH_PROMISE frame.
+  enum class PayloadState {
+    // The frame is padded and we need to read the PAD_LENGTH field (1 byte).
+    kReadPadLength,
+
+    // Ready to start decoding the fixed size fields of the PUSH_PROMISE
+    // frame into push_promise_fields_.
+    kStartDecodingPushPromiseFields,
+
+    // The decoder has already called OnPushPromiseStart, and is now reporting
+    // the HPACK block fragment to the listener's OnHpackFragment method.
+    kReadPayload,
+
+    // The decoder has finished with the HPACK block fragment, and is now
+    // ready to skip the trailing padding, if the frame has any.
+    kSkipPadding,
+
+    // The fixed size fields weren't all available when the decoder first tried
+    // to decode them (state kStartDecodingPushPromiseFields); this state
+    // resumes the decoding when ResumeDecodingPayload is called later.
+    kResumeDecodingPushPromiseFields,
+  };
+
+  // Starts the decoding of a PUSH_PROMISE frame's payload, and completes it if
+  // the entire payload is in the provided decode buffer.
+  DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
+
+  // Resumes decoding a PUSH_PROMISE frame's payload that has been split across
+  // decode buffers.
+  DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
+                                     DecodeBuffer* db);
+
+ private:
+  friend class test::PushPromisePayloadDecoderPeer;
+
+  void ReportPushPromise(FrameDecoderState* state);
+
+  PayloadState payload_state_;
+  Http2PushPromiseFields push_promise_fields_;
+};
+
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_PAYLOAD_DECODERS_PUSH_PROMISE_PAYLOAD_DECODER_H_