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/* iconvstream.cpp
*
* cxxtools - general purpose C++-toolbox
* Copyright (C) 2003 Tommi Maekitalo
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "cxxtools/iconvstream.h"
#include <string.h>
#include "config.h"
#include <errno.h>
#include <stdexcept>
namespace cxxtools
{
iconvstreambuf* iconvstreambuf::open(std::ostream& sink_,
const char* tocode, const char* fromcode)
{
sink = &sink_;
cd = iconv_open(tocode, fromcode);
if (cd == (iconv_t)-1)
{
if (errno == EINVAL)
{
std::string msg = "conversion not supported; from=\"";
msg += fromcode;
msg += "\" to \"";
msg += tocode;
throw std::runtime_error(msg);
}
return 0;
}
setp(buffer, buffer + (sizeof(buffer) - 1));
return this;
}
iconvstreambuf* iconvstreambuf::close() throw()
{
if (cd != (iconv_t)-1)
{
sync();
int r = iconv_close(cd);
if (r == 0)
{
cd = (iconv_t)-1;
return this;
}
else
return 0;
}
else
return this;
}
iconvstreambuf::int_type iconvstreambuf::overflow(int_type c)
{
if (sink == 0)
return traits_type::eof();
else if (pptr() == pbase())
{
// 1. Aufruf: initialisiere Puffer
setp(buffer, buffer + (sizeof(buffer) - 1));
if (c != traits_type::eof())
{
*pptr() = (char_type)c;
pbump(1);
}
return 0;
}
else
{
// Ausgabepuffer voll - konvertiere Zeichen
char outbuf[32];
size_t inbytesleft = pptr() - buffer;
if (c != traits_type::eof())
{
*pptr() = (char_type)c;
++inbytesleft;
}
size_t outbytesleft = sizeof(outbuf);
ICONV_CONST char* inbufptr = buffer;
char* outbufptr = outbuf;
// Konvertiere so viele Zeichen wie mglich
iconv(cd,
&inbufptr, &inbytesleft,
&outbufptr, &outbytesleft);
if (errno != 0 && errno != EINVAL && errno != E2BIG)
{
// Konvertierung fehlgeschlagen
return traits_type::eof();
}
errno = 0;
// Konvertierung erfolgreich
// Schreibe outbuf in sink
sink->write(outbuf, outbufptr - outbuf);
if (sink->fail())
return traits_type::eof();
// verschiebe brig gebliebene Zeichen an den Anfang des Puffers
// und setze Puffer neu.
if (inbytesleft > 0)
memmove(buffer, inbufptr, inbytesleft);
setp(buffer + inbytesleft, buffer + sizeof(buffer) - 1 - inbytesleft);
return 0;
}
}
iconvstream::int_type iconvstreambuf::underflow()
{
return traits_type::eof();
}
int iconvstreambuf::sync()
{
if (sink)
{
int_type ret = overflow(traits_type::eof());
sink->flush();
return ret == traits_type::eof() || sink->fail() ? -1 : 0;
}
else
return -1;
}
void iconvstream::open(std::ostream& sink_,
const char* tocode, const char* fromcode)
{
if (!fail() && streambuf.open(sink_, tocode, fromcode) == 0)
setstate(std::ios::failbit);
}
}
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