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/*
* Copyright 2008-2011 Fabrice Colin
*
* 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 <errno.h>
#include <iostream>
#include <glibmm/convert.h>
#include <glibmm/ustring.h>
#include "StringManip.h"
#include "TextConverter.h"
using std::clog;
using std::endl;
using std::string;
using namespace Glib;
TextConverter::TextConverter(unsigned int maxErrors) :
m_utf8Locale(false),
m_maxErrors(maxErrors),
m_conversionErrors(0)
{
// Get the locale charset
m_utf8Locale = get_charset(m_localeCharset);
}
TextConverter::~TextConverter()
{
}
dstring TextConverter::toUTF8(const dstring &text, string &charset)
{
string textCharset(StringManip::toLowerCase(charset));
char outputBuffer[8192];
char *pInput = const_cast<char *>(text.c_str());
m_conversionErrors = 0;
if ((text.empty() == true) ||
(textCharset == "utf-8"))
{
// No conversion necessary
return text;
}
if (textCharset.empty() == true)
{
if (m_utf8Locale == true)
{
// The current locale uses UTF-8
return text;
}
textCharset = m_localeCharset;
}
dstring outputText;
gsize inputSize = (gsize)text.length();
bool invalidSequence = false;
try
{
IConv converter("UTF-8", textCharset);
while (inputSize > 0)
{
char *pOutput = outputBuffer;
gsize outputSize = 8192;
size_t conversions = converter.iconv(&pInput, &inputSize, &pOutput, &outputSize);
int errorCode = errno;
if (conversions == static_cast<size_t>(-1))
{
if (errorCode == EILSEQ)
{
// Conversion was only partially successful
++m_conversionErrors;
#ifdef DEBUG
clog << "TextConverter::toUTF8: invalid sequence" << endl;
#endif
if (m_conversionErrors >= m_maxErrors)
{
// Give up
return text;
}
converter.reset();
outputText.append(outputBuffer, 8192 - outputSize);
if (invalidSequence == false)
{
outputText += "?";
invalidSequence = true;
}
// Skip that
++pInput;
--inputSize;
continue;
}
else if (errorCode != E2BIG)
{
#ifdef DEBUG
clog << "TextConverter::toUTF8: unknown error " << errorCode << endl;
#endif
return text;
}
}
else
{
invalidSequence = false;
}
// Append what was successfully converted
outputText.append(outputBuffer, 8192 - outputSize);
}
#ifdef DEBUG
clog << "TextConverter::toUTF8: " << m_conversionErrors << " conversion errors" << endl;
#endif
}
catch (Error &ce)
{
#ifdef DEBUG
clog << "TextConverter::toUTF8: " << ce.what() << endl;
#endif
outputText.clear();
string::size_type pos = textCharset.find('_');
if (pos != string::npos)
{
string fixedCharset(StringManip::replaceSubString(textCharset, "_", "-"));
#ifdef DEBUG
clog << "TextConverter::toUTF8: trying with charset " << fixedCharset << endl;
#endif
textCharset = fixedCharset;
outputText = toUTF8(text, fixedCharset);
}
}
catch (...)
{
#ifdef DEBUG
clog << "TextConverter::toUTF8: unknown exception" << endl;
#endif
outputText.clear();
}
charset = textCharset;
return outputText;
}
unsigned int TextConverter::getErrorsCount(void) const
{
return m_conversionErrors;
}
string TextConverter::fromUTF8(const string &text)
{
try
{
return locale_from_utf8(text);
}
catch (Error &ce)
{
#ifdef DEBUG
clog << "TextConverter::fromUTF8: " << ce.what() << endl;
#endif
}
catch (...)
{
#ifdef DEBUG
clog << "TextConverter::fromUTF8: unknown exception" << endl;
#endif
}
return "";
}
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