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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_HEADER_TABLE_H_
#define NET_SPDY_HPACK_HEADER_TABLE_H_
#include <cstddef>
#include <deque>
#include <vector>
#include "base/basictypes.h"
#include "base/macros.h"
#include "net/base/net_export.h"
#include "net/spdy/hpack_entry.h"
namespace net {
// All section references below are to
// http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-06
// A data structure for both the header table (described in 3.1.2) and
// the reference set (3.1.3). This structure also keeps track of how
// many times a header has been 'touched', which is useful for both
// encoding and decoding.
class NET_EXPORT_PRIVATE HpackHeaderTable {
public:
HpackHeaderTable();
~HpackHeaderTable();
uint32 size() const { return size_; }
uint32 max_size() const { return max_size_; }
// Returns the total number of entries.
uint32 GetEntryCount() const;
// The given index must be >= 1 and <= GetEntryCount().
const HpackEntry& GetEntry(uint32 index) const;
// The given index must be >= 1 and <= GetEntryCount().
HpackEntry* GetMutableEntry(uint32 index);
// Sets the maximum size of the header table, evicting entries if
// necessary as described in 3.3.2.
void SetMaxSize(uint32 max_size);
// The given entry must not be one from the header table, since it
// may get evicted. Tries to add the given entry to the header
// table, evicting entries if necessary as described in 3.3.3. index
// will be filled in with the index of the added entry, or 0 if the
// entry could not be added. removed_referenced_indices will be
// filled in with the indices of any removed entries that were in
// the reference set.
void TryAddEntry(const HpackEntry& entry,
uint32* index,
std::vector<uint32>* removed_referenced_indices);
private:
std::deque<HpackEntry> entries_;
uint32 size_;
uint32 max_size_;
DISALLOW_COPY_AND_ASSIGN(HpackHeaderTable);
};
} // namespace net
#endif // NET_SPDY_HPACK_HEADER_TABLE_H_
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