Project import generated by Copybara.
PiperOrigin-RevId: 224614037
Change-Id: I14e53449d4aeccb328f86828c76b5f09dea0d4b8
diff --git a/http2/decoder/payload_decoders/headers_payload_decoder.h b/http2/decoder/payload_decoders/headers_payload_decoder.h
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+++ b/http2/decoder/payload_decoders/headers_payload_decoder.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 QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
+#define QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
+
+// Decodes the payload of a HEADERS frame.
+
+#include "net/third_party/quiche/src/http2/decoder/decode_buffer.h"
+#include "net/third_party/quiche/src/http2/decoder/decode_status.h"
+#include "net/third_party/quiche/src/http2/decoder/frame_decoder_state.h"
+#include "net/third_party/quiche/src/http2/http2_structures.h"
+#include "net/third_party/quiche/src/http2/platform/api/http2_export.h"
+
+namespace http2 {
+namespace test {
+class HeadersPayloadDecoderPeer;
+} // namespace test
+
+class HTTP2_EXPORT_PRIVATE HeadersPayloadDecoder {
+ public:
+ // States during decoding of a HEADERS frame, unless the fast path kicks
+ // in, in which case the state machine will be bypassed.
+ enum class PayloadState {
+ // The PADDED flag is set, and we now need to read the Pad Length field
+ // (the first byte of the payload, after the common frame header).
+ kReadPadLength,
+
+ // The PRIORITY flag is set, and we now need to read the fixed size priority
+ // fields (E, Stream Dependency, Weight) into priority_fields_. Calls on
+ // OnHeadersPriority if completely decodes those fields.
+ kStartDecodingPriorityFields,
+
+ // The decoder passes the non-padding portion of the remaining payload
+ // (i.e. 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 kStartDecodingPriorityFields); this state resumes
+ // the decoding when ResumeDecodingPayload is called later.
+ kResumeDecodingPriorityFields,
+ };
+
+ // Starts the decoding of a HEADERS 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 HEADERS frame's payload that has been split across
+ // decode buffers.
+ DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
+ DecodeBuffer* db);
+
+ private:
+ friend class test::HeadersPayloadDecoderPeer;
+
+ PayloadState payload_state_;
+ Http2PriorityFields priority_fields_;
+};
+
+} // namespace http2
+
+#endif // QUICHE_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
