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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_SPDY_HPACK_ENTRY_H_
#define NET_SPDY_HPACK_ENTRY_H_
#include <cstddef>
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "net/base/net_export.h"
// All section references below are to
// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08
namespace net {
// A structure for an entry in the static table (3.3.1)
// and the header table (3.3.2).
class NET_EXPORT_PRIVATE HpackEntry {
public:
// The constant amount added to name().size() and value().size() to
// get the size of an HpackEntry as defined in 5.1.
static const size_t kSizeOverhead;
// Creates an entry. Preconditions:
// - |is_static| captures whether this entry is a member of the static
// or dynamic header table.
// - |insertion_index| is this entry's index in the total set of entries ever
// inserted into the header table (including static entries).
//
// The combination of |is_static| and |insertion_index| allows an
// HpackEntryTable to determine the index of an HpackEntry in O(1) time.
HpackEntry(base::StringPiece name,
base::StringPiece value,
bool is_static,
size_t insertion_index);
// Create a 'lookup' entry (only) suitable for querying a HpackEntrySet. The
// instance InsertionIndex() always returns 0 and IsLookup() returns true.
HpackEntry(base::StringPiece name, base::StringPiece value);
// Creates an entry with empty name and value. Only defined so that
// entries can be stored in STL containers.
HpackEntry();
~HpackEntry();
const std::string& name() const { return name_; }
const std::string& value() const { return value_; }
// Returns whether this entry is a member of the static (as opposed to
// dynamic) table.
bool IsStatic() const { return type_ == STATIC; }
// Returns whether this entry is a lookup-only entry.
bool IsLookup() const { return type_ == LOOKUP; }
// Used to compute the entry's index in the header table.
size_t InsertionIndex() const { return insertion_index_; }
// Returns the size of an entry as defined in 5.1.
static size_t Size(base::StringPiece name, base::StringPiece value);
size_t Size() const;
std::string GetDebugString() const;
private:
enum EntryType {
LOOKUP,
DYNAMIC,
STATIC,
};
// TODO(jgraettinger): Reduce copies, possibly via SpdyPinnableBufferPiece.
std::string name_;
std::string value_;
// The entry's index in the total set of entries ever inserted into the header
// table.
size_t insertion_index_;
EntryType type_;
};
} // namespace net
#endif // NET_SPDY_HPACK_ENTRY_H_
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