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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2013-2018 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx library is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later version.
*
* ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
*
* You should have received copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#ifndef NDN_ENCODING_ESTIMATOR_HPP
#define NDN_ENCODING_ESTIMATOR_HPP
#include "ndn-cxx/encoding/block.hpp"
namespace ndn {
namespace encoding {
/**
* @brief Helper class to estimate size of TLV encoding
* Interface of this class (mostly) matches interface of Encoder class
* @sa Encoder
*/
class Estimator : noncopyable
{
public: // common interface between Encoder and Estimator
/**
* @brief Prepend a byte
*/
constexpr size_t
prependByte(uint8_t) const noexcept
{
return 1;
}
/**
* @brief Append a byte
*/
constexpr size_t
appendByte(uint8_t) const noexcept
{
return 1;
}
/**
* @brief Prepend a byte array @p array of length @p length
*/
constexpr size_t
prependByteArray(const uint8_t*, size_t length) const noexcept
{
return length;
}
/**
* @brief Append a byte array @p array of length @p length
*/
constexpr size_t
appendByteArray(const uint8_t*, size_t length) const noexcept
{
return length;
}
/**
* @brief Prepend range of bytes from the range [@p first, @p last)
*/
template<class Iterator>
size_t
prependRange(Iterator first, Iterator last) const noexcept
{
return std::distance(first, last);
}
/**
* @brief Append range of bytes from the range [@p first, @p last)
*/
template<class Iterator>
size_t
appendRange(Iterator first, Iterator last) const noexcept
{
return std::distance(first, last);
}
/**
* @brief Prepend VarNumber @p varNumber of NDN TLV encoding
* @sa http://named-data.net/doc/ndn-tlv/
*/
size_t
prependVarNumber(uint64_t varNumber) const noexcept;
/**
* @brief Prepend VarNumber @p varNumber of NDN TLV encoding
* @sa http://named-data.net/doc/ndn-tlv/
*/
size_t
appendVarNumber(uint64_t varNumber) const noexcept;
/**
* @brief Prepend non-negative integer @p integer of NDN TLV encoding
* @sa http://named-data.net/doc/ndn-tlv/
*/
size_t
prependNonNegativeInteger(uint64_t integer) const noexcept;
/**
* @brief Append non-negative integer @p integer of NDN TLV encoding
* @sa http://named-data.net/doc/ndn-tlv/
*/
size_t
appendNonNegativeInteger(uint64_t integer) const noexcept;
/**
* @brief Prepend TLV block of type @p type and value from buffer @p array of size @p arraySize
*/
size_t
prependByteArrayBlock(uint32_t type, const uint8_t* array, size_t arraySize) const noexcept;
/**
* @brief Append TLV block of type @p type and value from buffer @p array of size @p arraySize
*/
size_t
appendByteArrayBlock(uint32_t type, const uint8_t* array, size_t arraySize) const noexcept;
/**
* @brief Prepend TLV block @p block
*/
size_t
prependBlock(const Block& block) const;
/**
* @brief Append TLV block @p block
*/
size_t
appendBlock(const Block& block) const;
};
} // namespace encoding
} // namespace ndn
#endif // NDN_ENCODING_ESTIMATOR_HPP