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

net/http2/decoder/frame_parts_collector.h

Index: net/http2/decoder/frame_parts_collector.h
diff --git a/net/http2/decoder/frame_parts_collector.h b/net/http2/decoder/frame_parts_collector.h
new file mode 100644
index 0000000000000000000000000000000000000000..c411e48eabdb5a9dc7548e8a99040d92d95f6f0d
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+++ b/net/http2/decoder/frame_parts_collector.h
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+// 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_FRAME_PARTS_COLLECTOR_H_
+#define NET_HTTP2_DECODER_FRAME_PARTS_COLLECTOR_H_
+
+// FramePartsCollector is a base class for Http2FrameDecoderListener
+// implementations that create one FrameParts instance for each decoded frame.
+
+#include <stddef.h>
+
+#include <memory>
+#include <vector>
+
+#include "net/http2/decoder/frame_parts.h"
+#include "net/http2/decoder/http2_frame_decoder_listener.h"
+#include "net/http2/decoder/http2_frame_decoder_listener_test_util.h"
+#include "net/http2/http2_structures.h"
+
+namespace net {
+namespace test {
+
+class FramePartsCollector : public FailingHttp2FrameDecoderListener {
+ public:
+  FramePartsCollector();
+  ~FramePartsCollector() override;
+
+  // Toss out the collected data.
+  void Reset();
+
+  // Returns true if has started recording the info for a frame and has not yet
+  // finished doing so.
+  bool IsInProgress() const { return current_frame_ != nullptr; }
+
+  // Returns the FrameParts instance into which we're currently recording
+  // callback info if IsInProgress, else nullptr.
+  const FrameParts* current_frame() const { return current_frame_.get(); }
+
+  // Returns the completely collected FrameParts instances.
+  const std::vector<std::unique_ptr<FrameParts>>& collected_frames() const {
+    return collected_frames_;
+  }
+
+  // Returns the number of completely collected FrameParts instances.
+  size_t size() const { return collected_frames_.size(); }
+
+  // Returns the n'th frame, where 0 is the oldest of the collected frames,
+  // and n==size() is the frame currently being collected, if there is one.
+  // Returns nullptr if the requested index is not valid.
+  const FrameParts* frame(size_t n) const;
+
+ protected:
+  // In support of OnFrameHeader, set the header that we expect to be used in
+  // the next call.
+  // TODO(jamessynge): Remove ExpectFrameHeader et al. once done with supporting
+  // SpdyFramer's exact states.
+  void ExpectFrameHeader(const Http2FrameHeader& header);
+
+  // For use in implementing On*Start methods of Http2FrameDecoderListener,
+  // returns a FrameParts instance, which will be newly created if
+  // IsInProgress==false (which the caller should ensure), else will be the
+  // current_frame(); never returns nullptr.
+  // If called when IsInProgress==true, a test failure will be recorded.
+  Http2FrameDecoderListener* StartFrame(const Http2FrameHeader& header);
+
+  // For use in implementing On* callbacks, such as OnPingAck, that are the only
+  // call expected for the frame being decoded; not for On*Start methods.
+  // Returns a FrameParts instance, which will be newly created if
+  // IsInProgress==false (which the caller should ensure), else will be the
+  // current_frame(); never returns nullptr.
+  // If called when IsInProgress==true, a test failure will be recorded.
+  Http2FrameDecoderListener* StartAndEndFrame(const Http2FrameHeader& header);
+
+  // If IsInProgress==true, returns the FrameParts into which the current
+  // frame is being recorded; else records a test failure and returns
+  // failing_listener_, which will record a test failure when any of its
+  // On* methods is called.
+  Http2FrameDecoderListener* CurrentFrame();
+
+  // For use in implementing On*End methods, pushes the current frame onto
+  // the vector of completed frames, and returns a pointer to it for recording
+  // the info in the final call. If IsInProgress==false, records a test failure
+  // and returns failing_listener_, which will record a test failure when any
+  // of its On* methods is called.
+  Http2FrameDecoderListener* EndFrame();
+
+  // For use in implementing OnPaddingTooLong and OnFrameSizeError, is
+  // equivalent to EndFrame() if IsInProgress==true, else equivalent to
+  // StartAndEndFrame().
+  Http2FrameDecoderListener* FrameError(const Http2FrameHeader& header);
+
+ private:
+  // Returns the mutable FrameParts instance into which we're currently
+  // recording callback info if IsInProgress, else nullptr.
+  FrameParts* current_frame() { return current_frame_.get(); }
+
+  // If expected header is set, verify that it matches the header param.
+  // TODO(jamessynge): Remove TestExpectedHeader et al. once done
+  // with supporting SpdyFramer's exact states.
+  void TestExpectedHeader(const Http2FrameHeader& header);
+
+  std::unique_ptr<FrameParts> current_frame_;
+  std::vector<std::unique_ptr<FrameParts>> collected_frames_;
+  FailingHttp2FrameDecoderListener failing_listener_;
+
+  // TODO(jamessynge): Remove expected_header_ et al. once done with supporting
+  // SpdyFramer's exact states.
+  Http2FrameHeader expected_header_;
+  bool expected_header_set_ = false;
+};
+
+}  // namespace test
+}  // namespace net
+
+#endif  // NET_HTTP2_DECODER_FRAME_PARTS_COLLECTOR_H_