blob: ff6852b31ae0d579f7dd1e415ad7474246bf602f [file] [log] [blame]
/**
* Copyright (C) 2013 Regents of the University of California.
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_UTIL_IO_HPP
#define NDN_UTIL_IO_HPP
#include "../common.hpp"
#include "../encoding/block.hpp"
#include <string>
#include <iostream>
#include <fstream>
#include "../security/cryptopp.hpp"
namespace ndn {
namespace io {
class Error : public std::runtime_error
{
public:
explicit
Error(const std::string& what)
: std::runtime_error(what)
{
}
};
enum IoEncoding {
NO_ENCODING,
BASE_64,
HEX
};
template<typename T>
shared_ptr<T>
load(std::istream& is, IoEncoding encoding = BASE_64)
{
typedef typename T::Error TypeError;
try
{
using namespace CryptoPP;
shared_ptr<T> object = make_shared<T>();
OBufferStream os;
switch (encoding)
{
case NO_ENCODING:
{
FileSource ss(is, true, new FileSink(os));
break;
}
case BASE_64:
{
FileSource ss(is, true, new Base64Decoder(new FileSink(os)));
break;
}
case HEX:
{
FileSource ss(is, true, new HexDecoder(new FileSink(os)));
break;
}
default:
return shared_ptr<T>();
}
object->wireDecode(Block(os.buf()));
return object;
}
catch (CryptoPP::Exception& e)
{
return shared_ptr<T>();
}
catch (Block::Error& e)
{
return shared_ptr<T>();
}
catch (TypeError& e)
{
return shared_ptr<T>();
}
}
template<typename T>
shared_ptr<T>
load(const std::string& file, IoEncoding encoding = BASE_64)
{
std::ifstream is(file.c_str());
return load<T>(is, encoding);
}
template<typename T>
void
save(const T& object, std::ostream& os, IoEncoding encoding = BASE_64)
{
typedef typename T::Error TypeError;
try
{
using namespace CryptoPP;
Block block = object.wireEncode();
switch (encoding)
{
case NO_ENCODING:
{
StringSource ss(block.wire(), block.size(), true,
new FileSink(os));
break;
}
case BASE_64:
{
StringSource ss(block.wire(), block.size(), true,
new Base64Encoder(new FileSink(os), true, 64));
break;
}
case HEX:
{
StringSource ss(block.wire(), block.size(), true,
new HexEncoder(new FileSink(os)));
break;
}
default:
return;
}
return;
}
catch (CryptoPP::Exception& e)
{
throw Error(e.what());
}
catch (Block::Error& e)
{
throw Error(e.what());
}
catch (TypeError& e)
{
throw Error(e.what());
}
}
template<typename T>
void
save(const T& object, const std::string& file, IoEncoding encoding = BASE_64)
{
std::ofstream os(file.c_str());
save(object, os, encoding);
}
} // namespace io
} // namespace ndn
#endif // NDN_UTIL_IO_HPP