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Side by Side Diff: net/spdy/hpack_entry.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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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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