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1 // Copyright 2014 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_ENTRY_H_ | |
6 #define NET_SPDY_HPACK_ENTRY_H_ | |
7 | |
8 #include <cstddef> | |
9 #include <set> | |
10 #include <string> | |
11 | |
12 #include "base/basictypes.h" | |
13 #include "base/macros.h" | |
14 #include "base/strings/string_piece.h" | |
15 #include "net/base/net_export.h" | |
16 | |
17 // All section references below are to | |
18 // http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 | |
19 | |
20 namespace net { | |
21 | |
22 // A structure for an entry in the static table (3.3.1) | |
23 // and the header table (3.3.2). | |
24 class NET_EXPORT_PRIVATE HpackEntry { | |
25 public: | |
26 // The constant amount added to name().size() and value().size() to | |
27 // get the size of an HpackEntry as defined in 5.1. | |
28 static const size_t kSizeOverhead; | |
29 | |
30 // Creates an entry. Preconditions: | |
31 // - |is_static| captures whether this entry is a member of the static | |
32 // or dynamic header table. | |
33 // - |insertion_index| is this entry's index in the total set of entries ever | |
34 // inserted into the header table (including static entries). | |
35 // | |
36 // The combination of |is_static| and |insertion_index| allows an | |
37 // HpackEntryTable to determine the index of an HpackEntry in O(1) time. | |
38 HpackEntry(base::StringPiece name, | |
39 base::StringPiece value, | |
40 bool is_static, | |
41 size_t insertion_index); | |
42 | |
43 // Create a 'lookup' entry (only) suitable for querying a HpackEntrySet. The | |
44 // instance InsertionIndex() always returns 0 and IsLookup() returns true. | |
45 HpackEntry(base::StringPiece name, base::StringPiece value); | |
46 | |
47 // Creates an entry with empty name and value. Only defined so that | |
48 // entries can be stored in STL containers. | |
49 HpackEntry(); | |
50 | |
51 ~HpackEntry(); | |
52 | |
53 const std::string& name() const { return name_; } | |
54 const std::string& value() const { return value_; } | |
55 | |
56 // Returns whether this entry is a member of the static (as opposed to | |
57 // dynamic) table. | |
58 bool IsStatic() const { return type_ == STATIC; } | |
59 | |
60 // Returns whether this entry is a lookup-only entry. | |
61 bool IsLookup() const { return type_ == LOOKUP; } | |
62 | |
63 // Used to compute the entry's index in the header table. | |
64 size_t InsertionIndex() const { return insertion_index_; } | |
65 | |
66 // Returns the size of an entry as defined in 5.1. | |
67 static size_t Size(base::StringPiece name, base::StringPiece value); | |
68 size_t Size() const; | |
69 | |
70 std::string GetDebugString() const; | |
71 | |
72 private: | |
73 enum EntryType { | |
74 LOOKUP, | |
75 DYNAMIC, | |
76 STATIC, | |
77 }; | |
78 | |
79 // TODO(jgraettinger): Reduce copies, possibly via SpdyPinnableBufferPiece. | |
80 std::string name_; | |
81 std::string value_; | |
82 | |
83 // The entry's index in the total set of entries ever inserted into the header | |
84 // table. | |
85 size_t insertion_index_; | |
86 | |
87 EntryType type_; | |
88 }; | |
89 | |
90 } // namespace net | |
91 | |
92 #endif // NET_SPDY_HPACK_ENTRY_H_ | |
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