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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
/**
* Copyright (C) 2013 Regents of the University of California.
* @author: Jeff Thompson <jefft0@remap.ucla.edu>
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_DATA_HPP
#define NDN_DATA_HPP
#include "common.hpp"
#include "name.hpp"
#include "encoding/block.hpp"
#include "signature.hpp"
#include "meta-info.hpp"
#include "key-locator.hpp"
namespace ndn {
class Data : public enable_shared_from_this<Data>
{
public:
struct Error : public std::runtime_error { Error(const std::string &what) : std::runtime_error(what) {} };
/**
* @brief Create an empty Data object
*/
inline
Data();
/**
* @brief Create a new Data object with the given name
* @param name A reference to the name which is copied.
*/
inline
Data(const Name& name);
/**
* @brief The destructor
*/
inline
~Data();
/**
* @brief Fast encoding or block size estimation
*/
template<bool T>
inline size_t
wireEncode(EncodingImpl<T> &block, bool unsignedPortion = false) const;
/**
* @brief Encode to a wire format
*/
inline const Block&
wireEncode() const;
/**
* @brief Decode from the wire format
*/
inline void
wireDecode(const Block &wire);
////////////////////////////////////////////////////////////////////
inline const Name&
getName() const;
/**
* @brief Set name to a copy of the given Name.
*
* @param name The Name which is copied.
* @return This Data so that you can chain calls to update values.
*/
inline void
setName(const Name& name);
//
inline const MetaInfo&
getMetaInfo() const;
/**
* @brief Set metaInfo to a copy of the given MetaInfo.
* @param metaInfo The MetaInfo which is copied.
* @return This Data so that you can chain calls to update values.
*/
inline void
setMetaInfo(const MetaInfo& metaInfo);
//
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
// MetaInfo proxy methods
inline uint32_t
getContentType() const;
inline void
setContentType(uint32_t type);
//
inline Milliseconds
getFreshnessPeriod() const;
inline void
setFreshnessPeriod(Milliseconds freshnessPeriod);
//
inline const name::Component&
getFinalBlockId() const;
inline void
setFinalBlockId(const name::Component& finalBlockId);
//
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////
/**
* @brief Get content Block
*
* To access content value, one can use value()/value_size() or
* value_begin()/value_end() methods of the Block class
*/
inline const Block&
getContent() const;
/**
* @brief Set the content to a copy of the data in the vector.
* @param content A vector whose contents are copied.
* @return This Data so that you can chain calls to update values.
*/
inline void
setContent(const uint8_t* content, size_t contentLength);
inline void
setContent(const Block& content);
inline void
setContent(const ConstBufferPtr &contentValue);
//
inline const Signature&
getSignature() const;
/**
* @brief Set the signature to a copy of the given signature.
* @param signature The signature object which is cloned.
*/
inline void
setSignature(const Signature& signature);
inline void
setSignatureValue(const Block &value);
///////////////////////////////////////////////////////////////
inline uint64_t
getIncomingFaceId() const;
inline void
setIncomingFaceId(uint64_t incomingFaceId);
private:
/**
* @brief Clear the wire encoding.
*/
inline void
onChanged();
private:
Name m_name;
MetaInfo m_metaInfo;
mutable Block m_content;
Signature m_signature;
mutable Block m_wire;
uint64_t m_incomingFaceId;
};
inline
Data::Data()
: m_content(Tlv::Content) // empty content
{
}
inline
Data::Data(const Name& name)
: m_name(name)
{
}
inline
Data::~Data()
{
}
template<bool T>
inline size_t
Data::wireEncode(EncodingImpl<T> &block, bool unsignedPortion/* = false*/) const
{
size_t total_len = 0;
// Data ::= DATA-TLV TLV-LENGTH
// Name
// MetaInfo
// Content
// Signature
// (reverse encoding)
if (!unsignedPortion && !m_signature)
{
throw Error("Requested wire format, but data packet has not been signed yet");
}
if (!unsignedPortion)
{
// SignatureValue
total_len += prependBlock(block, m_signature.getValue());
}
// SignatureInfo
total_len += prependBlock(block, m_signature.getInfo());
// Content
total_len += prependBlock(block, getContent());
// MetaInfo
total_len += getMetaInfo().wireEncode(block);
// Name
total_len += getName().wireEncode(block);
if (!unsignedPortion)
{
total_len += block.prependVarNumber (total_len);
total_len += block.prependVarNumber (Tlv::Data);
}
return total_len;
}
inline const Block &
Data::wireEncode() const
{
if (m_wire.hasWire())
return m_wire;
EncodingEstimator estimator;
size_t estimatedSize = wireEncode(estimator);
EncodingBuffer buffer(estimatedSize, 0);
wireEncode(buffer);
const_cast<Data*>(this)->wireDecode(buffer.block());
return m_wire;
}
/**
* Decode the input using a particular wire format and update this Data.
* @param input The input byte array to be decoded.
*/
void
Data::wireDecode(const Block &wire)
{
m_wire = wire;
m_wire.parse();
// Data ::= DATA-TLV TLV-LENGTH
// Name
// MetaInfo
// Content
// Signature
// Name
m_name.wireDecode(m_wire.get(Tlv::Name));
// MetaInfo
m_metaInfo.wireDecode(m_wire.get(Tlv::MetaInfo));
// Content
m_content = m_wire.get(Tlv::Content);
///////////////
// Signature //
///////////////
// SignatureInfo
m_signature.setInfo(m_wire.get(Tlv::SignatureInfo));
// SignatureValue
Block::element_const_iterator val = m_wire.find(Tlv::SignatureValue);
if (val != m_wire.elements_end())
m_signature.setValue(*val);
}
inline const Name&
Data::getName() const
{
return m_name;
}
inline void
Data::setName(const Name& name)
{
onChanged();
m_name = name;
}
inline const MetaInfo&
Data::getMetaInfo() const
{
return m_metaInfo;
}
inline void
Data::setMetaInfo(const MetaInfo& metaInfo)
{
onChanged();
m_metaInfo = metaInfo;
}
inline uint32_t
Data::getContentType() const
{
return m_metaInfo.getType();
}
inline void
Data::setContentType(uint32_t type)
{
onChanged();
m_metaInfo.setType(type);
}
inline Milliseconds
Data::getFreshnessPeriod() const
{
return m_metaInfo.getFreshnessPeriod();
}
inline void
Data::setFreshnessPeriod(Milliseconds freshnessPeriod)
{
onChanged();
m_metaInfo.setFreshnessPeriod(freshnessPeriod);
}
inline const name::Component&
Data::getFinalBlockId() const
{
return m_metaInfo.getFinalBlockId();
}
inline void
Data::setFinalBlockId(const name::Component& finalBlockId)
{
onChanged();
m_metaInfo.setFinalBlockId(finalBlockId);
}
inline const Block&
Data::getContent() const
{
if (m_content.empty())
m_content = dataBlock(Tlv::Content, reinterpret_cast<const uint8_t*>(0), 0);
if (!m_content.hasWire())
m_content.encode();
return m_content;
}
inline void
Data::setContent(const uint8_t* content, size_t contentLength)
{
onChanged();
m_content = dataBlock(Tlv::Content, content, contentLength);
}
inline void
Data::setContent(const ConstBufferPtr &contentValue)
{
onChanged();
m_content = Block(Tlv::Content, contentValue); // not real a wire encoding yet
}
inline void
Data::setContent(const Block& content)
{
onChanged();
if (content.type() == Tlv::Content)
m_content = content;
else {
m_content = Block(Tlv::Content, content);
}
}
inline const Signature&
Data::getSignature() const
{
return m_signature;
}
inline void
Data::setSignature(const Signature& signature)
{
onChanged();
m_signature = signature;
}
inline void
Data::setSignatureValue(const Block &value)
{
onChanged();
m_signature.setValue(value);
}
inline uint64_t
Data::getIncomingFaceId() const
{
return m_incomingFaceId;
}
inline void
Data::setIncomingFaceId(uint64_t incomingFaceId)
{
m_incomingFaceId = incomingFaceId;
}
inline void
Data::onChanged()
{
// The values have changed, so the wire format is invalidated
// !!!Note!!! Signature is not invalidated and it is responsibility of
// the application to do proper re-signing if necessary
m_wire.reset();
}
inline std::ostream&
operator << (std::ostream &os, const Data &data)
{
os << "Name: " << data.getName() << "\n";
os << "MetaInfo: " << data.getMetaInfo() << "\n";
os << "Content: (size: " << data.getContent().value_size() << ")\n";
os << "Signature: (type: " << data.getSignature().getType() <<
", value_length: "<< data.getSignature().getValue().value_size() << ")";
os << std::endl;
return os;
}
} // namespace ndn
#endif