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

net/http2/decoder/http2_frame_decoder.h

-// 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_HTTP2_FRAME_DECODER_H_
-#define NET_HTTP2_DECODER_HTTP2_FRAME_DECODER_H_
-
-// Http2FrameDecoder decodes the available input until it reaches the end of
-// the input or it reaches the end of the first frame in the input.
-// Note that Http2FrameDecoder does only minimal validation; for example,
-// stream ids are not checked, nor is the sequence of frames such as
-// CONTINUATION frame placement.
-//
-// Http2FrameDecoder enters state kError once it has called the listener's
-// OnFrameSizeError or OnPaddingTooLong methods, and at this time has no
-// provision for leaving that state. While the HTTP/2 spec (RFC7540) allows
-// for some such errors to be considered as just stream errors in some cases,
-// this implementation treats them all as connection errors.
-
-#include <stddef.h>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#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/decoder/http2_frame_decoder_listener.h"
-#include "net/http2/decoder/payload_decoders/altsvc_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/continuation_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/data_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/goaway_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/headers_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/ping_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/priority_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/push_promise_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/rst_stream_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/settings_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/unknown_payload_decoder.h"
-#include "net/http2/decoder/payload_decoders/window_update_payload_decoder.h"
-#include "net/http2/http2_structures.h"
-
-namespace net {
-namespace test {
-class Http2FrameDecoderPeer;
-}  // namespace test
-
-class NET_EXPORT_PRIVATE Http2FrameDecoder {
- public:
-  explicit Http2FrameDecoder(Http2FrameDecoderListener* listener);
-  Http2FrameDecoder() : Http2FrameDecoder(nullptr) {}
-
-  // The decoder will call the listener's methods as it decodes a frame.
-  void set_listener(Http2FrameDecoderListener* listener);
-  Http2FrameDecoderListener* listener() const;
-
-  // The decoder will reject frame's whose payload
-  // length field exceeds the maximum payload size.
-  void set_maximum_payload_size(size_t v) { maximum_payload_size_ = v; }
-  size_t maximum_payload_size() const { return maximum_payload_size_; }
-
-  // Decodes the input up to the next frame boundary (i.e. at most one frame).
-  //
-  // Returns kDecodeDone if it decodes the final byte of a frame, OR if there
-  // is no input and it is awaiting the start of a new frame (e.g. if this
-  // is the first call to DecodeFrame, or if the previous call returned
-  // kDecodeDone).
-  //
-  // Returns kDecodeInProgress if it decodes all of the decode buffer, but has
-  // not reached the end of the frame.
-  //
-  // Returns kDecodeError if the frame's padding or length wasn't valid (i.e. if
-  // the decoder called either the listener's OnPaddingTooLong or
-  // OnFrameSizeError method).
-  DecodeStatus DecodeFrame(DecodeBuffer* db);
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Methods that support Http2FrameDecoderAdapter.
-
-  // Is the remainder of the frame's payload being discarded?
-  bool IsDiscardingPayload() const { return state_ == State::kDiscardPayload; }
-
-  // Returns the number of bytes of the frame's payload that remain to be
-  // decoded, excluding any trailing padding. This method must only be called
-  // after the frame header has been decoded AND DecodeFrame has returned
-  // kDecodeInProgress.
-  size_t remaining_payload() const;
-
-  // Returns the number of bytes of trailing padding after the payload that
-  // remain to be decoded. This method must only be called if the frame type
-  // allows padding, and after the frame header has been decoded AND
-  // DecodeFrame has returned. Will return 0 if the Pad Length field has not
-  // yet been decoded.
-  uint32_t remaining_padding() const;
-
- private:
-  enum class State {
-    // Ready to start decoding a new frame's header.
-    kStartDecodingHeader,
-    // Was in state kStartDecodingHeader, but unable to read the entire frame
-    // header, so needs more input to complete decoding the header.
-    kResumeDecodingHeader,
-
-    // Have decoded the frame header, and started decoding the available bytes
-    // of the frame's payload, but need more bytes to finish the job.
-    kResumeDecodingPayload,
-
-    // Decoding of the most recently started frame resulted in an error:
-    // OnPaddingTooLong or OnFrameSizeError was called to indicate that the
-    // decoder detected a problem, or OnFrameHeader returned false, indicating
-    // that the listener detected a problem. Regardless of which, the decoder
-    // will stay in state kDiscardPayload until it has been passed the rest
-    // of the bytes of the frame's payload that it hasn't yet seen, after
-    // which it will be ready to decode another frame.
-    kDiscardPayload,
-  };
-
-  friend class test::Http2FrameDecoderPeer;
-  friend std::ostream& operator<<(std::ostream& out, State v);
-
-  DecodeStatus StartDecodingPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingPayload(DecodeBuffer* db);
-  DecodeStatus DiscardPayload(DecodeBuffer* db);
-
-  const Http2FrameHeader& frame_header() const {
-    return frame_decoder_state_.frame_header();
-  }
-
-  // Clear any of the flags in the frame header that aren't set in valid_flags.
-  void RetainFlags(uint8_t valid_flags);
-
-  // Clear all of the flags in the frame header; for use with frame types that
-  // don't define any flags, such as WINDOW_UPDATE.
-  void ClearFlags();
-
-  // These methods call the StartDecodingPayload() method of the frame type's
-  // payload decoder, after first clearing invalid flags in the header. The
-  // caller must ensure that the decode buffer does not extend beyond the
-  // end of the payload (handled by Http2FrameDecoder::StartDecodingPayload).
-  DecodeStatus StartDecodingAltSvcPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingContinuationPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingDataPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingGoAwayPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingHeadersPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingPingPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingPriorityPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingPushPromisePayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingRstStreamPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingSettingsPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingUnknownPayload(DecodeBuffer* db);
-  DecodeStatus StartDecodingWindowUpdatePayload(DecodeBuffer* db);
-
-  // These methods call the ResumeDecodingPayload() method of the frame type's
-  // payload decoder; they are called only if the preceding call to the
-  // corresponding Start method (above) returned kDecodeInProgress, as did any
-  // subsequent calls to the resume method.
-  // Unlike the Start methods, the decode buffer may extend beyond the
-  // end of the payload, so the method will create a DecodeBufferSubset
-  // before calling the ResumeDecodingPayload method of the frame type's
-  // payload decoder.
-  DecodeStatus ResumeDecodingAltSvcPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingContinuationPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingDataPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingGoAwayPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingHeadersPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingPingPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingPriorityPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingPushPromisePayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingRstStreamPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingSettingsPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingUnknownPayload(DecodeBuffer* db);
-  DecodeStatus ResumeDecodingWindowUpdatePayload(DecodeBuffer* db);
-
-  FrameDecoderState frame_decoder_state_;
-
-  // We only need one payload decoder at a time, so they share the same storage.
-  union {
-    AltSvcPayloadDecoder altsvc_payload_decoder_;
-    ContinuationPayloadDecoder continuation_payload_decoder_;
-    DataPayloadDecoder data_payload_decoder_;
-    GoAwayPayloadDecoder goaway_payload_decoder_;
-    HeadersPayloadDecoder headers_payload_decoder_;
-    PingPayloadDecoder ping_payload_decoder_;
-    PriorityPayloadDecoder priority_payload_decoder_;
-    PushPromisePayloadDecoder push_promise_payload_decoder_;
-    RstStreamPayloadDecoder rst_stream_payload_decoder_;
-    SettingsPayloadDecoder settings_payload_decoder_;
-    UnknownPayloadDecoder unknown_payload_decoder_;
-    WindowUpdatePayloadDecoder window_update_payload_decoder_;
-  };
-
-  State state_;
-  size_t maximum_payload_size_;
-
-  // Listener used whenever caller passes nullptr to set_listener.
-  Http2FrameDecoderNoOpListener no_op_listener_;
-
-  DISALLOW_COPY_AND_ASSIGN(Http2FrameDecoder);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP2_DECODER_HTTP2_FRAME_DECODER_H_