Util.cpp

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/***************************************************************************
 *   Copyright (C) 2006 by Ilya A. Volynets-Evenbakh                       *
 *   ilya@total-knowledge.com                                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include <servlet/Util.h>
#include <stdio.h>
#include <stdlib.h>

namespace servlet
{
namespace util
{

std::string urlDecode(const std::string& s)
{
    std::string result(s);
    urlInPlaceDecode(result);
    return result;
}


void urlInPlaceDecode(std::string& s)
{
    std::string::size_type w=0;
    for (std::string::size_type p=0; p < s.size(); p++,w++) {
        if (s[p] == '+'){
            s[w]= ' ';  // translate '+' to ' ':
        } else if ((s[p] == '%') && (p + 2 < s.size())) {  // check length
            char str[]={s[p+1],s[p+2],0};
            char *pp;
            unsigned char c=(unsigned char)strtoul(str,&pp,16);
            if(pp==str+2){
                s[w]=c;
                p+=2;
            } else {
                s[w]=s[p];
            }
        }else {
            s[w]=s[p];
        }
    }
    s.erase(w);
}

std::string& urlEncode(const std::string& source, std::string& dest)
{
    dest.clear();
    for(std::string::size_type r=0; r< source.length(); r++) {
        const char c=source[r];
        if((c>'0' && c<'9')||(c>'a' && c<'z')
           ||(c>'A' && c<'Z') || c=='_')
        {
            dest+=c;
        }
        else
        {
            char hex[4];
            sprintf(hex,"%%%x",(unsigned int)c);
            dest.append(hex);
        }
    }
    return dest;
}

}
}