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charset.cpp

/***************************************************************************
 *   Copyright (C) 2008-2009 by Andrzej Rybczak                            *
 *   electricityispower@gmail.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.,                                       *
 *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
 ***************************************************************************/

#include "charset.h"

#ifdef HAVE_ICONV_H

#include <iconv.h>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <stdexcept>

#include "settings.h"
#include "str_pool.h"

namespace
{
      inline bool char_non_ascii(char ch)
      {
            return (ch & 0x80) != 0;
      }
      
      bool has_non_ascii_chars(const char *s)
      {
            for (; s; s++)
                  if (char_non_ascii(*s))
                        return true;
            return false;
      }
      
      bool has_non_ascii_chars(const std::string &s)
      {
            for (std::string::const_iterator it = s.begin(); it != s.end(); it++)
                  if (char_non_ascii(*it))
                        return true;
            return false;
      }
      
      void charset_convert(const char *from, const char *to, char *&inbuf, size_t len = 0)
      {
            if (!inbuf || !from || !to)
                  return;
            
            iconv_t cd = iconv_open(to, from);
            
            if (cd == (iconv_t)-1)
                  return;
            
            if (!len)
                  len = strlen(inbuf);
            size_t buflen = len*6+1;
            char *outbuf = new char[buflen];
            char *outstart = outbuf;
            char *instart = inbuf;
            
            if (iconv(cd, const_cast<ICONV_CONST char **>(&inbuf), &len, &outbuf, &buflen) == (size_t)-1)
            {
                  delete [] outstart;
                  iconv_close(cd);
                  return;
            }
            iconv_close(cd);
            *outbuf = 0;
            str_pool_put(instart);
            inbuf = str_pool_get(outstart);
            delete [] outstart;
      }
}

void utf_to_locale(std::string &s)
{
      if (s.empty() || Config.system_encoding.empty() || !has_non_ascii_chars(s))
            return;
      char *tmp = str_pool_get(s.c_str());
      charset_convert("utf-8", Config.system_encoding.c_str(), tmp, s.length());
      s = tmp;
      str_pool_put(tmp);
}

std::string utf_to_locale_cpy(const std::string &s)
{
      std::string result = s;
      utf_to_locale(result);
      return result;
}

void locale_to_utf(std::string &s)
{
      if (s.empty() || Config.system_encoding.empty() || !has_non_ascii_chars(s))
            return;
      char *tmp = str_pool_get(s.c_str());
      charset_convert(Config.system_encoding.c_str(), "utf-8", tmp, s.length());
      s = tmp;
      str_pool_put(tmp);
}

std::string locale_to_utf_cpy(const std::string &s)
{
      std::string result = s;
      locale_to_utf(result);
      return result;
}

void str_pool_utf_to_locale(char *&s)
{
      if (!s || Config.system_encoding.empty() || !has_non_ascii_chars(s))
            return;
      charset_convert("utf-8", Config.system_encoding.c_str(), s);
}

void str_pool_locale_to_utf(char *&s)
{
      if (!s || Config.system_encoding.empty() || !has_non_ascii_chars(s))
            return;
      charset_convert(Config.system_encoding.c_str(), "utf-8", s);
}

#endif // HAVE_ICONV_H


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