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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_HPACK_DECODER_HPACK_ENTRY_TYPE_DECODER_H_ | |
6 #define NET_HTTP2_HPACK_DECODER_HPACK_ENTRY_TYPE_DECODER_H_ | |
7 | |
8 // Decodes the type of an HPACK entry, and the variable length integer whose | |
9 // prefix is in the low-order bits of the same byte, "below" the type bits. | |
10 // The integer represents an index into static or dynamic table, which may be | |
11 // zero, or is the new size limit of the dynamic table. | |
12 | |
13 #include <string> | |
14 | |
15 #include "base/logging.h" | |
16 #include "net/base/net_export.h" | |
17 #include "net/http2/decoder/decode_buffer.h" | |
18 #include "net/http2/decoder/decode_status.h" | |
19 #include "net/http2/hpack/decoder/hpack_varint_decoder.h" | |
20 #include "net/http2/hpack/http2_hpack_constants.h" | |
21 | |
22 namespace net { | |
23 | |
24 class NET_EXPORT_PRIVATE HpackEntryTypeDecoder { | |
25 public: | |
26 // Only call when the decode buffer has data (i.e. HpackEntryDecoder must | |
27 // not call until there is data). | |
28 DecodeStatus Start(DecodeBuffer* db); | |
29 | |
30 // Only call Resume if the previous call (Start or Resume) returned | |
31 // DecodeStatus::kDecodeInProgress. | |
32 DecodeStatus Resume(DecodeBuffer* db) { return varint_decoder_.Resume(db); } | |
33 | |
34 // Returns the decoded entry type. Only call if the preceding call to Start | |
35 // or Resume returned kDecodeDone. | |
36 HpackEntryType entry_type() const { return entry_type_; } | |
37 | |
38 // Returns the decoded variable length integer. Only call if the | |
39 // preceding call to Start or Resume returned kDecodeDone. | |
40 uint32_t varint() const { return varint_decoder_.value(); } | |
41 | |
42 std::string DebugString() const; | |
43 | |
44 private: | |
45 HpackVarintDecoder varint_decoder_; | |
46 | |
47 // This field is initialized just to keep ASAN happy about reading it | |
48 // from DebugString(). | |
49 HpackEntryType entry_type_ = HpackEntryType::kIndexedHeader; | |
50 }; | |
51 | |
52 NET_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& out, | |
53 const HpackEntryTypeDecoder& v); | |
54 | |
55 } // namespace net | |
56 #endif // NET_HTTP2_HPACK_DECODER_HPACK_ENTRY_TYPE_DECODER_H_ | |
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