/*
* 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 Library 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 "autoconfig.h"
#include "cstr.h"
#include "transcode.h"
#include "mimehandler.h"
#include "debuglog.h"
#include "smallut.h"
// Called after decoding from utf-8 failed. Handle the common case
// where this is a good old 8bit-encoded text document left-over when
// the locale was switched to utf-8. We try to guess a charset
// according to the locale language and use it. This is a very rough
// heuristic, but may be better than discarding the data.
// If we still get a significant number of decode errors, the doc is
// quite probably binary, so just fail.
static bool alternate_decode(const string& in, string& out)
{
string lang = localelang();
string code = langtocode(lang);
LOGDEB(("RecollFilter::txtdcode: trying alternate decode from %s\n",
code.c_str()));
int ecnt;
bool ret = transcode(in, out, code, cstr_utf8, &ecnt);
return ecnt > 5 ? false : ret;
}
bool RecollFilter::txtdcode(const string& who)
{
if (m_metaData[cstr_dj_keymt].compare(cstr_textplain)) {
LOGERR(("%s::txtdcode: called on non txt/plain: %s\n", who.c_str(),
m_metaData[cstr_dj_keymt].c_str()));
return false;
}
string& ocs = m_metaData[cstr_dj_keyorigcharset];
string& itext = m_metaData[cstr_dj_keycontent];
LOGDEB1(("%s::txtdcode: %d bytes from [%s] to UTF-8\n",
who.c_str(), itext.size(), ocs.c_str()));
int ecnt;
string otext;
bool ret = transcode(itext, otext, ocs, cstr_utf8, &ecnt);
if (!ret || ecnt > int(itext.size() / 100)) {
LOGERR(("%s::txtdcode: transcode %d bytes to UTF-8 failed "
"for input charset [%s] ret %d ecnt %d\n",
who.c_str(), itext.size(), ocs.c_str(), ret, ecnt));
if (samecharset(ocs, cstr_utf8)) {
ret = alternate_decode(itext, otext);
} else {
ret = false;
}
if (!ret) {
LOGDEB(("txtdcode: failed. Doc is not text?\n"));
itext.erase();
return false;
}
}
itext.swap(otext);
m_metaData[cstr_dj_keycharset] = cstr_utf8;
return true;
}