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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2014 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_KEY_LOCATOR_HPP
#define NDN_KEY_LOCATOR_HPP
#include "encoding/block.hpp"
#include "encoding/encoding-buffer.hpp"
#include "name.hpp"
namespace ndn {
class KeyLocator
{
public:
class Error : public std::runtime_error
{
public:
explicit
Error(const std::string& what)
: std::runtime_error(what)
{
}
};
enum {
KeyLocator_None = 65535, // just an arbitrarily large number (used only internally)
KeyLocator_Name = 0,
KeyLocator_Unknown = 255
};
KeyLocator()
: m_type(KeyLocator_None)
{
}
KeyLocator(const Name& name)
{
setName(name);
}
/**
* @brief Create from wire encoding
*/
explicit
KeyLocator(const Block& wire)
{
wireDecode(wire);
}
///////////////////////////////////////////////////////////////////////////////
template<bool T>
size_t
wireEncode(EncodingImpl<T>& block) const;
const Block&
wireEncode() const;
void
wireDecode(const Block& wire);
///////////////////////////////////////////////////////////////////////////////
bool
empty() const
{
return m_type == KeyLocator_None;
}
uint32_t
getType() const { return m_type; }
////////////////////////////////////////////////////////
// Helper methods for different types of key locators
//
// For now only Name type is actually supported
const Name&
getName() const;
void
setName(const Name& name);
public: // EqualityComparable concept
bool
operator==(const KeyLocator& other) const;
bool
operator!=(const KeyLocator& other) const;
private:
uint32_t m_type;
Name m_name;
mutable Block m_wire;
};
template<bool T>
inline size_t
KeyLocator::wireEncode(EncodingImpl<T>& block) const
{
// KeyLocator ::= KEY-LOCATOR-TYPE TLV-LENGTH KeyLocatorValue
// KeyLocatorValue ::= Name |
// KeyLocatorDigest | (not supported yet)
// ...
// KeyLocatorDigest ::= KEY-LOCATOR-DIGEST-TYPE TLV-LENGTH BYTE+
size_t totalLength = 0;
switch (m_type) {
case KeyLocator_None:
break;
case KeyLocator_Name:
totalLength += m_name.wireEncode(block);
break;
default:
throw Error("Unsupported KeyLocator type");
}
totalLength += block.prependVarNumber(totalLength);
totalLength += block.prependVarNumber(tlv::KeyLocator);
return totalLength;
}
inline const Block&
KeyLocator::wireEncode() const
{
if (m_wire.hasWire())
return m_wire;
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
m_wire = buffer.block();
return m_wire;
}
inline void
KeyLocator::wireDecode(const Block& value)
{
if (value.type() != tlv::KeyLocator)
throw Error("Unexpected TLV type during KeyLocator decoding");
m_wire = value;
m_wire.parse();
if (!m_wire.elements().empty() && m_wire.elements_begin()->type() == tlv::Name)
{
m_type = KeyLocator_Name;
m_name.wireDecode(*m_wire.elements_begin());
}
else
{
m_type = KeyLocator_Unknown;
}
}
inline const Name&
KeyLocator::getName() const
{
if (m_type != KeyLocator_Name)
throw Error("Requested Name, but KeyLocator is not of the Name type");
return m_name;
}
inline void
KeyLocator::setName(const Name& name)
{
m_wire.reset();
m_type = KeyLocator_Name;
m_name = name;
}
inline bool
KeyLocator::operator==(const KeyLocator& other) const
{
return wireEncode() == other.wireEncode();
}
inline bool
KeyLocator::operator!=(const KeyLocator& other) const
{
return !this->operator==(other);
}
} // namespace ndn
#endif