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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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