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68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
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// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
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#define NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
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// Decodes the payload of a HEADERS frame.
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#include "net/http2/decoder/decode_buffer.h"
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#include "net/http2/decoder/decode_status.h"
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#include "net/http2/decoder/frame_decoder_state.h"
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#include "net/http2/http2_structures.h"
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#include "net/http2/platform/api/http2_export.h"
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namespace net {
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namespace test {
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class HeadersPayloadDecoderPeer;
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} // namespace test
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class HTTP2_EXPORT_PRIVATE HeadersPayloadDecoder {
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public:
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// States during decoding of a HEADERS frame, unless the fast path kicks
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// in, in which case the state machine will be bypassed.
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enum class PayloadState {
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// The PADDED flag is set, and we now need to read the Pad Length field
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// (the first byte of the payload, after the common frame header).
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kReadPadLength,
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// The PRIORITY flag is set, and we now need to read the fixed size priority
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// fields (E, Stream Dependency, Weight) into priority_fields_. Calls on
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// OnHeadersPriority if completely decodes those fields.
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kStartDecodingPriorityFields,
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// The decoder passes the non-padding portion of the remaining payload
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// (i.e. the HPACK block fragment) to the listener's OnHpackFragment method.
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kReadPayload,
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// The decoder has finished with the HPACK block fragment, and is now
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// ready to skip the trailing padding, if the frame has any.
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kSkipPadding,
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// The fixed size fields weren't all available when the decoder first tried
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// to decode them (state kStartDecodingPriorityFields); this state resumes
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// the decoding when ResumeDecodingPayload is called later.
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kResumeDecodingPriorityFields,
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};
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// Starts the decoding of a HEADERS frame's payload, and completes it if
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// the entire payload is in the provided decode buffer.
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DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db);
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// Resumes decoding a HEADERS frame's payload that has been split across
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// decode buffers.
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DecodeStatus ResumeDecodingPayload(FrameDecoderState* state,
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DecodeBuffer* db);
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private:
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friend class test::HeadersPayloadDecoderPeer;
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PayloadState payload_state_;
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Http2PriorityFields priority_fields_;
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};
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} // namespace net
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#endif // NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_
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