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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_ALTSVC_PAYLOAD_DECODER_H_ | |
6 #define NET_HTTP2_DECODER_PAYLOAD_DECODERS_ALTSVC_PAYLOAD_DECODER_H_ | |
7 | |
8 // Decodes the payload of a ALTSVC 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 AltSvcPayloadDecoderPeer; | |
19 } // namespace test | |
20 | |
21 class NET_EXPORT_PRIVATE AltSvcPayloadDecoder { | |
22 public: | |
23 // States during decoding of a ALTSVC frame. | |
24 enum class PayloadState { | |
25 // Start decoding the fixed size structure at the start of an ALTSVC | |
26 // frame (Http2AltSvcFields). | |
27 kStartDecodingStruct, | |
28 | |
29 // Handle the DecodeStatus returned from starting or resuming the | |
30 // decoding of Http2AltSvcFields. If complete, calls OnAltSvcStart. | |
31 kMaybeDecodedStruct, | |
32 | |
33 // Reports the value of the strings (origin and value) of an ALTSVC frame | |
34 // to the listener. | |
35 kDecodingStrings, | |
36 | |
37 // The initial decode buffer wasn't large enough for the Http2AltSvcFields, | |
38 // so this state resumes the decoding when ResumeDecodingPayload is called | |
39 // later with a new DecodeBuffer. | |
40 kResumeDecodingStruct, | |
41 }; | |
42 | |
43 // Starts the decoding of a ALTSVC frame's payload, and completes it if the | |
44 // entire payload is in the provided decode buffer. | |
45 DecodeStatus StartDecodingPayload(FrameDecoderState* state, DecodeBuffer* db); | |
46 | |
47 // Resumes decoding a ALTSVC frame's payload that has been split across | |
48 // decode buffers. | |
49 DecodeStatus ResumeDecodingPayload(FrameDecoderState* state, | |
50 DecodeBuffer* db); | |
51 | |
52 private: | |
53 friend class test::AltSvcPayloadDecoderPeer; | |
54 | |
55 // Implements state kDecodingStrings. | |
56 DecodeStatus DecodeStrings(FrameDecoderState* state, DecodeBuffer* db); | |
57 | |
58 Http2AltSvcFields altsvc_fields_; | |
59 PayloadState payload_state_; | |
60 }; | |
61 | |
62 } // namespace net | |
63 | |
64 #endif // NET_HTTP2_DECODER_PAYLOAD_DECODERS_ALTSVC_PAYLOAD_DECODER_H_ | |
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