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Issue 2554683003: Revert of Add new HTTP/2 and HPACK decoder in net/http2/. (Closed)
Patch Set: Created 4 years ago
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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_DECODE_HTTP2_STRUCTURES_H_
6 #define NET_HTTP2_DECODER_DECODE_HTTP2_STRUCTURES_H_
7
8 // Provides functions for decoding the fixed size structures in the HTTP/2 spec.
9
10 // TODO(jamessynge): Consider whether the value of the SlowDecode methods is
11 // worth their complexity; in particular, dropping back to buffering at most
12 // 9 bytes (the largest fixed size structure) may actually be more efficient
13 // than using the SlowDecode methods, or at least worth the complexity
14 // reduction.
15 // See http2_structure_decoder.h et al for an experiment in removing all except
16 // DoDecode.
17
18 #include "net/base/net_export.h"
19 #include "net/http2/decoder/decode_buffer.h"
20 #include "net/http2/http2_structures.h"
21
22 namespace net {
23
24 // DoDecode(STRUCTURE* out, DecodeBuffer* b) decodes the structure from start
25 // to end, advancing the cursor by STRUCTURE::EncodedSize(). The decoder buffer
26 // must be large enough (i.e. b->Remaining() >= STRUCTURE::EncodedSize()).
27
28 NET_EXPORT_PRIVATE void DoDecode(Http2FrameHeader* out, DecodeBuffer* b);
29 NET_EXPORT_PRIVATE void DoDecode(Http2PriorityFields* out, DecodeBuffer* b);
30 NET_EXPORT_PRIVATE void DoDecode(Http2RstStreamFields* out, DecodeBuffer* b);
31 NET_EXPORT_PRIVATE void DoDecode(Http2SettingFields* out, DecodeBuffer* b);
32 NET_EXPORT_PRIVATE void DoDecode(Http2PushPromiseFields* out, DecodeBuffer* b);
33 NET_EXPORT_PRIVATE void DoDecode(Http2PingFields* out, DecodeBuffer* b);
34 NET_EXPORT_PRIVATE void DoDecode(Http2GoAwayFields* out, DecodeBuffer* b);
35 NET_EXPORT_PRIVATE void DoDecode(Http2WindowUpdateFields* out, DecodeBuffer* b);
36 NET_EXPORT_PRIVATE void DoDecode(Http2AltSvcFields* out, DecodeBuffer* b);
37
38 // MaybeDecode(STRUCTURE* out, DecodeBuffer* b) decodes the structure from
39 // start to end if the decoder buffer is large enough, advancing the cursor
40 // by STRUCTURE::EncodedSize(), then returns true.
41 // If the decode buffer isn't large enough, does nothing and returns false.
42 // The buffer is large enough if b->Remaining() >= STRUCTURE::EncodedSize().
43
44 NET_EXPORT_PRIVATE bool MaybeDecode(Http2FrameHeader* out, DecodeBuffer* b);
45 NET_EXPORT_PRIVATE bool MaybeDecode(Http2PriorityFields* out, DecodeBuffer* b);
46 NET_EXPORT_PRIVATE bool MaybeDecode(Http2RstStreamFields* out, DecodeBuffer* b);
47 NET_EXPORT_PRIVATE bool MaybeDecode(Http2SettingFields* out, DecodeBuffer* b);
48 NET_EXPORT_PRIVATE bool MaybeDecode(Http2PushPromiseFields* out,
49 DecodeBuffer* b);
50 NET_EXPORT_PRIVATE bool MaybeDecode(Http2PingFields* out, DecodeBuffer* b);
51 NET_EXPORT_PRIVATE bool MaybeDecode(Http2GoAwayFields* out, DecodeBuffer* b);
52 NET_EXPORT_PRIVATE bool MaybeDecode(Http2WindowUpdateFields* out,
53 DecodeBuffer* b);
54 NET_EXPORT_PRIVATE bool MaybeDecode(Http2AltSvcFields* out, DecodeBuffer* b);
55
56 // SlowDecode(STRUCTURE* out, DecodeBuffer* b, uint32_t* offset) provides
57 // incremental decoding of a structure, supporting cases where the structure
58 // is split across multiple input buffers. *offset represents the offset within
59 // the encoding of the structure, in the range [0, STRUCTURE::EncodedSize()].
60 // Returns true when it is able to completely decode the structure, false
61 // before that. Updates *offset to record the progress decoding the structure;
62 // if false is returned, then b->Remaining() == 0 when SlowDecode returns.
63
64 NET_EXPORT_PRIVATE bool SlowDecode(Http2FrameHeader* out,
65 DecodeBuffer* b,
66 uint32_t* offset);
67 NET_EXPORT_PRIVATE bool SlowDecode(Http2PriorityFields* out,
68 DecodeBuffer* b,
69 uint32_t* offset);
70 NET_EXPORT_PRIVATE bool SlowDecode(Http2RstStreamFields* out,
71 DecodeBuffer* b,
72 uint32_t* offset);
73 NET_EXPORT_PRIVATE bool SlowDecode(Http2SettingFields* out,
74 DecodeBuffer* b,
75 uint32_t* offset);
76 NET_EXPORT_PRIVATE bool SlowDecode(Http2PushPromiseFields* out,
77 DecodeBuffer* b,
78 uint32_t* offset);
79 NET_EXPORT_PRIVATE bool SlowDecode(Http2PingFields* out,
80 DecodeBuffer* b,
81 uint32_t* offset);
82 NET_EXPORT_PRIVATE bool SlowDecode(Http2GoAwayFields* out,
83 DecodeBuffer* b,
84 uint32_t* offset);
85 NET_EXPORT_PRIVATE bool SlowDecode(Http2WindowUpdateFields* out,
86 DecodeBuffer* b,
87 uint32_t* offset);
88 NET_EXPORT_PRIVATE bool SlowDecode(Http2AltSvcFields* out,
89 DecodeBuffer* b,
90 uint32_t* offset);
91
92 } // namespace net
93
94 #endif // NET_HTTP2_DECODER_DECODE_HTTP2_STRUCTURES_H_
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