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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_ |
| 6 #define NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_ |
| 7 |
| 8 // Decodes the payload of a HEADERS frame. |
| 9 |
| 10 #include "net/base/net_export.h" |
| 11 #include "net/http2/decoder/decode_buffer.h" |
| 12 #include "net/http2/decoder/decode_status.h" |
| 13 #include "net/http2/decoder/frame_decoder_state.h" |
| 14 #include "net/http2/http2_structures.h" |
| 15 |
| 16 namespace net { |
| 17 namespace test { |
| 18 class HeadersPayloadDecoderPeer; |
| 19 } // namespace test |
| 20 |
| 21 class NET_EXPORT_PRIVATE HeadersPayloadDecoder { |
| 22 public: |
| 23 // States during decoding of a HEADERS frame, unless the fast path kicks |
| 24 // in, in which case the state machine will be bypassed. |
| 25 enum class PayloadState { |
| 26 // The PADDED flag is set, and we now need to read the Pad Length field |
| 27 // (the first byte of the payload, after the common frame header). |
| 28 kReadPadLength, |
| 29 |
| 30 // The PRIORITY flag is set, and we now need to read the fixed size priority |
| 31 // fields (E, Stream Dependency, Weight) into priority_fields_. Calls on |
| 32 // OnHeadersPriority if completely decodes those fields. |
| 33 kStartDecodingPriorityFields, |
| 34 |
| 35 // The decoder passes the non-padding portion of the remaining payload |
| 36 // (i.e. the HPACK block fragment) to the listener's OnHpackFragment method. |
| 37 kReadPayload, |
| 38 |
| 39 // The decoder has finished with the HPACK block fragment, and is now |
| 40 // ready to skip the trailing padding, if the frame has any. |
| 41 kSkipPadding, |
| 42 |
| 43 // The fixed size fields weren't all available when the decoder first tried |
| 44 // to decode them (state kStartDecodingPriorityFields); this state resumes |
| 45 // the decoding when ResumeDecodingPayload is called later. |
| 46 kResumeDecodingPriorityFields, |
| 47 }; |
| 48 |
| 49 // Starts the decoding of a HEADERS frame's payload, and completes it if |
| 50 // the entire payload is in the provided decode buffer. |
| 51 DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db); |
| 52 |
| 53 // Resumes decoding a HEADERS frame's payload that has been split across |
| 54 // decode buffers. |
| 55 DecodeStatus ResumeDecodingPayload(FrameDecoderState* state, |
| 56 DecodeBuffer* db); |
| 57 |
| 58 private: |
| 59 friend class test::HeadersPayloadDecoderPeer; |
| 60 |
| 61 PayloadState payload_state_; |
| 62 Http2PriorityFields priority_fields_; |
| 63 }; |
| 64 |
| 65 } // namespace net |
| 66 |
| 67 #endif // NET_HTTP2_DECODER_PAYLOAD_DECODERS_HEADERS_PAYLOAD_DECODER_H_ |
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