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/*
* JsonRpc-Cpp - JSON-RPC implementation.
* Copyright (C) 2008-2011 Sebastien Vincent <sebastien.vincent@cppextrem.com>
*
* This program 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.
*
* This program 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 a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* \file netstring.cpp
* \brief NetString implementation (http://cr.yp.to/proto/netstrings.txt).
* \author Sebastien Vincent
*/
#include "netstring.h"
#include <cstdio>
#include <iostream>
#include <stdexcept>
namespace netstring
{
std::string encode(const std::string& str)
{
unsigned long len = str.length();
char strLen[32];
std::string ret;
/* format of a netstring is [len]:[string], */
sprintf(strLen, "%lu:", len);
ret.append(strLen);
ret.append(str);
ret.append(",");
return ret;
}
std::string decode(const std::string& str) throw(netstring::NetstringException)
{
unsigned long len = 0;
size_t index = 0; /* position of ":" */
size_t index2 = 0; /* position of "," */
size_t i = 0;
const char* data = str.data();
std::string ret;
index = str.find_first_of(":");
if(index == std::string::npos)
{
/* error */
throw NetstringException("netstring: missing ':' character");
}
index2 = str.find_last_of(",");
if(index2 == std::string::npos)
{
/* error */
throw NetstringException("netstring: missing ',' character");
}
for(i = 0 ; i < index ; i++)
{
if(isdigit(data[i]))
{
len = len * 10 + (data[i] - (char)0x30);
}
else
{
/* error */
throw NetstringException("netstring: parsing error");
}
}
if(len != (str.length() - index - 2))
{
/* error */
throw NetstringException("netstring: size mismatch");
}
ret.assign(str, index + 1, len);
return ret;
}
NetstringException::NetstringException(const std::string& msg) throw()
{
m_msg = msg;
}
NetstringException::~NetstringException() throw()
{
}
const char* NetstringException::what() const throw()
{
return m_msg.c_str();
}
} /* namespace netstring */
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