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1 // Copyright 2017 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_SPDY_HPACK_HPACK_DECODER3_H_ | |
6 #define NET_SPDY_HPACK_HPACK_DECODER3_H_ | |
7 | |
8 // HpackDecoder3 implements HpackDecoderInterface, using Http2HpackDecoder to | |
9 // decode HPACK blocks into HTTP/2 header lists as outlined in | |
10 // http://tools.ietf.org/html/rfc7541. | |
11 | |
12 #include <stddef.h> | |
13 | |
14 #include <memory> | |
15 | |
16 #include "base/macros.h" | |
17 #include "net/base/net_export.h" | |
18 #include "net/http2/hpack/decoder/hpack_decoder_listener.h" | |
19 #include "net/http2/hpack/decoder/http2_hpack_decoder.h" | |
20 #include "net/http2/hpack/hpack_string.h" | |
21 #include "net/http2/hpack/http2_hpack_constants.h" | |
22 #include "net/spdy/hpack/hpack_decoder_interface.h" | |
23 #include "net/spdy/hpack/hpack_header_table.h" | |
24 #include "net/spdy/platform/api/spdy_string_piece.h" | |
25 #include "net/spdy/spdy_header_block.h" | |
26 #include "net/spdy/spdy_headers_handler_interface.h" | |
27 | |
28 namespace net { | |
29 namespace test { | |
30 class HpackDecoder3Peer; | |
31 } // namespace test | |
32 | |
33 class NET_EXPORT_PRIVATE HpackDecoder3 : public HpackDecoderInterface { | |
34 public: | |
35 friend test::HpackDecoder3Peer; | |
36 HpackDecoder3(); | |
37 ~HpackDecoder3() override; | |
38 | |
39 // Override the HpackDecoderInterface methods: | |
40 | |
41 void ApplyHeaderTableSizeSetting(size_t size_setting) override; | |
42 void HandleControlFrameHeadersStart( | |
43 SpdyHeadersHandlerInterface* handler) override; | |
44 bool HandleControlFrameHeadersData(const char* headers_data, | |
45 size_t headers_data_length) override; | |
46 bool HandleControlFrameHeadersComplete(size_t* compressed_len) override; | |
47 const SpdyHeaderBlock& decoded_block() const override; | |
48 void SetHeaderTableDebugVisitor( | |
49 std::unique_ptr<HpackHeaderTable::DebugVisitorInterface> visitor) | |
50 override; | |
51 void set_max_decode_buffer_size_bytes( | |
52 size_t max_decode_buffer_size_bytes) override; | |
53 size_t EstimateMemoryUsage() const override; | |
54 | |
55 private: | |
56 class NET_EXPORT_PRIVATE ListenerAdapter | |
57 : public HpackDecoderListener, | |
58 public HpackDecoderTablesDebugListener { | |
59 public: | |
60 ListenerAdapter(); | |
61 ~ListenerAdapter() override; | |
62 | |
63 // If a SpdyHeadersHandlerInterface is provided, the decoder will emit | |
64 // headers to it rather than accumulating them in a SpdyHeaderBlock. | |
65 // Does not take ownership of the handler, but does use the pointer until | |
66 // the current HPACK block is completely decoded. | |
67 void set_handler(SpdyHeadersHandlerInterface* handler); | |
68 const SpdyHeaderBlock& decoded_block() const { return decoded_block_; } | |
69 | |
70 void SetHeaderTableDebugVisitor( | |
71 std::unique_ptr<HpackHeaderTable::DebugVisitorInterface> visitor); | |
72 | |
73 // Override the HpackDecoderListener methods: | |
74 void OnHeaderListStart() override; | |
75 void OnHeader(HpackEntryType entry_type, | |
76 const HpackString& name, | |
77 const HpackString& value) override; | |
78 void OnHeaderListEnd() override; | |
79 void OnHeaderErrorDetected(SpdyStringPiece error_message) override; | |
80 | |
81 // Override the HpackDecoderTablesDebugListener methods: | |
82 int64_t OnEntryInserted(const HpackStringPair& entry, | |
83 size_t insert_count) override; | |
84 void OnUseEntry(const HpackStringPair& entry, | |
85 size_t insert_count, | |
86 int64_t insert_time) override; | |
87 | |
88 void AddToTotalHpackBytes(size_t delta) { total_hpack_bytes_ += delta; } | |
89 size_t total_hpack_bytes() const { return total_hpack_bytes_; } | |
90 | |
91 private: | |
92 // If the caller doesn't provide a handler, the header list is stored in | |
93 // this SpdyHeaderBlock. | |
94 SpdyHeaderBlock decoded_block_; | |
95 | |
96 // If non-NULL, handles decoded headers. Not owned. | |
97 SpdyHeadersHandlerInterface* handler_; | |
98 | |
99 // Total bytes that have been received as input (i.e. HPACK encoded) | |
100 // in the current HPACK block. | |
101 size_t total_hpack_bytes_; | |
102 | |
103 // Total bytes of the name and value strings in the current HPACK block. | |
104 size_t total_uncompressed_bytes_; | |
105 | |
106 // visitor_ is used by a QUIC experiment regarding HPACK; remove | |
107 // when the experiment is done. | |
108 std::unique_ptr<HpackHeaderTable::DebugVisitorInterface> visitor_; | |
109 }; | |
110 | |
111 // Converts calls to HpackDecoderListener into calls to | |
112 // SpdyHeadersHandlerInterface. | |
113 ListenerAdapter listener_adapter_; | |
114 | |
115 // The actual decoder. | |
116 Http2HpackDecoder hpack_decoder_; | |
117 | |
118 // How much encoded data this decoder is willing to buffer. | |
119 size_t max_decode_buffer_size_bytes_; | |
120 | |
121 // Flag to keep track of having seen the header block start. Needed at the | |
122 // moment because HandleControlFrameHeadersStart won't be called if a handler | |
123 // is not being provided by the caller. | |
124 bool header_block_started_; | |
125 | |
126 DISALLOW_COPY_AND_ASSIGN(HpackDecoder3); | |
127 }; | |
128 | |
129 } // namespace net | |
130 | |
131 #endif // NET_SPDY_HPACK_HPACK_DECODER3_H_ | |
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