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

net/http2/decoder/payload_decoders/continuation_payload_decoder.cc

Index: net/http2/decoder/payload_decoders/continuation_payload_decoder.cc
diff --git a/net/http2/decoder/payload_decoders/continuation_payload_decoder.cc b/net/http2/decoder/payload_decoders/continuation_payload_decoder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ac5371c056f9c91ffdd87d81b627c08fc61c251a
--- /dev/null
+++ b/net/http2/decoder/payload_decoders/continuation_payload_decoder.cc
@@ -0,0 +1,58 @@
+// 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.
+
+#include "net/http2/decoder/payload_decoders/continuation_payload_decoder.h"
+
+#include <stddef.h>
+
+#include "base/logging.h"
+#include "net/http2/decoder/decode_buffer.h"
+#include "net/http2/decoder/http2_frame_decoder_listener.h"
+#include "net/http2/http2_constants.h"
+#include "net/http2/http2_structures.h"
+
+namespace net {
+
+DecodeStatus ContinuationPayloadDecoder::StartDecodingPayload(
+    FrameDecoderState* state,
+    DecodeBuffer* db) {
+  const Http2FrameHeader& frame_header = state->frame_header();
+  const uint32_t total_length = frame_header.payload_length;
+
+  DVLOG(2) << "ContinuationPayloadDecoder::StartDecodingPayload: "
+           << frame_header;
+  DCHECK_EQ(Http2FrameType::CONTINUATION, frame_header.type);
+  DCHECK_LE(db->Remaining(), total_length);
+  DCHECK_EQ(0, frame_header.flags & ~(Http2FrameFlag::FLAG_END_HEADERS));
+
+  state->InitializeRemainders();
+  state->listener()->OnContinuationStart(frame_header);
+  return ResumeDecodingPayload(state, db);
+}
+
+DecodeStatus ContinuationPayloadDecoder::ResumeDecodingPayload(
+    FrameDecoderState* state,
+    DecodeBuffer* db) {
+  DVLOG(2) << "ContinuationPayloadDecoder::ResumeDecodingPayload"
+           << "  remaining_payload=" << state->remaining_payload()
+           << "  db->Remaining=" << db->Remaining();
+  DCHECK_EQ(Http2FrameType::CONTINUATION, state->frame_header().type);
+  DCHECK_LE(state->remaining_payload(), state->frame_header().payload_length);
+  DCHECK_LE(db->Remaining(), state->remaining_payload());
+
+  size_t avail = db->Remaining();
+  DCHECK_LE(avail, state->remaining_payload());
+  if (avail > 0) {
+    state->listener()->OnHpackFragment(db->cursor(), avail);
+    db->AdvanceCursor(avail);
+    state->ConsumePayload(avail);
+  }
+  if (state->remaining_payload() == 0) {
+    state->listener()->OnContinuationEnd();
+    return DecodeStatus::kDecodeDone;
+  }
+  return DecodeStatus::kDecodeInProgress;
+}
+
+}  // namespace net