HPACKContext.h

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/*
 *  Copyright (c) 2015-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */
#pragma once

#include <proxygen/lib/http/codec/compress/HPACKConstants.h>
#include <proxygen/lib/http/codec/compress/HeaderTable.h>
#include <proxygen/lib/http/codec/compress/StaticHeaderTable.h>

namespace proxygen {

class HPACKContext {
 public:
  explicit HPACKContext(uint32_t tableSize);
  ~HPACKContext() {}

  uint32_t getIndex(const HPACKHeader& header) const;

  uint32_t nameIndex(const HPACKHeaderName& headerName) const;

  bool isStatic(uint32_t index) const;

  const HPACKHeader& getHeader(uint32_t index);

  const HeaderTable& getTable() const {
    return table_;
  }

  uint32_t getTableSize() const {
    return table_.capacity();
  }

  uint32_t getBytesStored() const {
    return table_.bytes();
  }

  uint32_t getHeadersStored() const {
    return table_.size();
  }

  void seedHeaderTable(std::vector<HPACKHeader>& headers);

  void describe(std::ostream& os) const;

 protected:
  const StaticHeaderTable& getStaticTable() const {
    return StaticHeaderTable::get();
  }

  uint32_t globalToDynamicIndex(uint32_t index) const {
    return index - getStaticTable().size();
  }
  uint32_t globalToStaticIndex(uint32_t index) const {
    return index;
  }
  uint32_t dynamicToGlobalIndex(uint32_t index) const {
    return index + getStaticTable().size();
  }
  uint32_t staticToGlobalIndex(uint32_t index) const {
    return index;
  }

  HeaderTable table_;
};

std::ostream& operator<<(std::ostream& os, const HPACKContext& context);

}