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/*
This file is part of the KDE libraries
Copyright (C) 2008 Wang Hoi (zealot.hoi@gmail.com)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "qencodingprober.h"
#include "nsCharSetProber.h"
#include "nsUniversalDetector.h"
#include "ChineseGroupProber.h"
#include "JapaneseGroupProber.h"
#include "UnicodeGroupProber.h"
#include "nsSBCSGroupProber.h"
#include "nsMBCSGroupProber.h"
#include <string.h>
class QEncodingProberPrivate
{
public:
QEncodingProberPrivate(): prober(NULL), mStart(true) {};
~QEncodingProberPrivate()
{
delete prober;
}
void setProberType(QEncodingProber::ProberType pType)
{
proberType = pType;
/* handle multi-byte encodings carefully , because they're hard to detect,
* and have to use some Stastics methods.
* for single-byte encodings (most western encodings), nsSBCSGroupProber is ok,
* because encoding state machine can detect many such encodings.
*/
delete prober;
switch (proberType) {
case QEncodingProber::None:
prober = NULL;
break;
case QEncodingProber::Arabic:
case QEncodingProber::Baltic:
case QEncodingProber::CentralEuropean:
case QEncodingProber::Cyrillic:
case QEncodingProber::Greek:
case QEncodingProber::Hebrew:
case QEncodingProber::NorthernSaami:
case QEncodingProber::Other:
case QEncodingProber::SouthEasternEurope:
case QEncodingProber::Thai:
case QEncodingProber::Turkish:
case QEncodingProber::WesternEuropean:
prober = new qencodingprober::nsSBCSGroupProber();
break;
case QEncodingProber::ChineseSimplified:
case QEncodingProber::ChineseTraditional:
prober = new qencodingprober::ChineseGroupProber();
break;
case QEncodingProber::Japanese:
prober = new qencodingprober::JapaneseGroupProber();
break;
case QEncodingProber::Korean:
prober = new qencodingprober::nsMBCSGroupProber();
break;
case QEncodingProber::Unicode:
prober = new qencodingprober::UnicodeGroupProber();
break;
case QEncodingProber::Universal:
prober = new qencodingprober::nsUniversalDetector();
break;
default:
prober = NULL;
}
}
void unicodeTest(const char *aBuf, int aLen)
{
if (mStart)
{
mStart = false;
if (aLen > 3)
switch (aBuf[0])
{
case '\xEF':
if (('\xBB' == aBuf[1]) && ('\xBF' == aBuf[2]))
// EF BB BF UTF-8 encoded BOM
proberState = QEncodingProber::FoundIt;
break;
case '\xFE':
if (('\xFF' == aBuf[1]) && ('\x00' == aBuf[2]) && ('\x00' == aBuf[3]))
// FE FF 00 00 UCS-4, unusual octet order BOM (3412)
proberState = QEncodingProber::FoundIt;
else if ('\xFF' == aBuf[1])
// FE FF UTF-16, big endian BOM
proberState = QEncodingProber::FoundIt;
break;
case '\x00':
if (('\x00' == aBuf[1]) && ('\xFE' == aBuf[2]) && ('\xFF' == aBuf[3]))
// 00 00 FE FF UTF-32, big-endian BOM
proberState = QEncodingProber::FoundIt;
else if (('\x00' == aBuf[1]) && ('\xFF' == aBuf[2]) && ('\xFE' == aBuf[3]))
// 00 00 FF FE UCS-4, unusual octet order BOM (2143)
proberState = QEncodingProber::FoundIt;
break;
case '\xFF':
if (('\xFE' == aBuf[1]) && ('\x00' == aBuf[2]) && ('\x00' == aBuf[3]))
// FF FE 00 00 UTF-32, little-endian BOM
proberState = QEncodingProber::FoundIt;
else if ('\xFE' == aBuf[1])
// FF FE UTF-16, little endian BOM
proberState = QEncodingProber::FoundIt;
break;
} // switch
}
}
QEncodingProber::ProberType proberType;
QEncodingProber::ProberState proberState;
qencodingprober::nsCharSetProber *prober;
bool mStart;
};
QEncodingProber::QEncodingProber(QEncodingProber::ProberType proberType): d(new QEncodingProberPrivate())
{
setProberType(proberType);
}
QEncodingProber::~QEncodingProber()
{
delete d;
}
void QEncodingProber::reset()
{
d->proberState = QEncodingProber::Probing;
d->mStart = true;
}
QEncodingProber::ProberState QEncodingProber::feed(const QByteArray &data)
{
return feed(data.data(), data.size());
}
QEncodingProber::ProberState QEncodingProber::feed(const char* data, int len)
{
if (!d->prober)
return d->proberState;
if (d->proberState == Probing) {
if (d->mStart) {
d->unicodeTest(data, len);
if (d->proberState == FoundIt)
return d->proberState;
}
d->prober->HandleData(data, len);
switch (d->prober->GetState())
{
case qencodingprober::eNotMe:
d->proberState = NotMe;
break;
case qencodingprober::eFoundIt:
d->proberState = FoundIt;
break;
default:
d->proberState = Probing;
break;
}
}
#ifdef DEBUG_PROBE
d->prober->DumpStatus();
#endif
return d->proberState;
}
QEncodingProber::ProberState QEncodingProber::state() const
{
return d->proberState;
}
//DEPRECATED, do *not* use
//#ifndef KDE_NO_DEPRECATED
//const char* QEncodingProber::encodingName() const
//{
// return qstrdup(encoding().constData());
//}
//#endif
QByteArray QEncodingProber::encoding() const
{
if (!d->prober)
return QByteArray("UTF-8");
return QByteArray(d->prober->GetCharSetName());
}
float QEncodingProber::confidence() const
{
if (!d->prober)
return 0.0;
return d->prober->GetConfidence();
}
QEncodingProber::ProberType QEncodingProber::proberType() const
{
return d->proberType;
}
void QEncodingProber::setProberType(QEncodingProber::ProberType proberType)
{
d->setProberType(proberType);
reset();
}
QEncodingProber::ProberType QEncodingProber::proberTypeForName(const QString& lang)
{
if (lang.isEmpty())
return QEncodingProber::Universal;
else if (lang=="Disabled")
return QEncodingProber::None;
else if (lang=="Universal")
return QEncodingProber::Universal;
else if (lang=="Unicode")
return QEncodingProber::Unicode;
else if (lang=="Cyrillic")
return QEncodingProber::Cyrillic;
else if (lang=="Western European")
return QEncodingProber::WesternEuropean;
else if (lang=="Central European")
return QEncodingProber::CentralEuropean;
else if (lang=="Greek")
return QEncodingProber::Greek;
else if (lang=="Hebrew")
return QEncodingProber::Hebrew;
else if (lang=="Turkish")
return QEncodingProber::Turkish;
else if (lang=="Japanese")
return QEncodingProber::Japanese;
else if (lang=="Baltic")
return QEncodingProber::Baltic;
else if (lang=="Chinese Traditional")
return QEncodingProber::ChineseTraditional;
else if (lang=="Chinese Simplified")
return QEncodingProber::ChineseSimplified;
else if (lang=="Arabic")
return QEncodingProber::Arabic;
return QEncodingProber::Universal;
}
QString QEncodingProber::nameForProberType(QEncodingProber::ProberType proberType)
{
switch (proberType)
{
case QEncodingProber::None:
return "Disabled";
break;
case QEncodingProber::Universal:
return "Universal";
break;
case QEncodingProber::Arabic:
return "Arabic";
break;
case QEncodingProber::Baltic:
return "Baltic";
break;
case QEncodingProber::CentralEuropean:
return "Central European";
break;
case QEncodingProber::Cyrillic:
return "Cyrillic";
break;
case QEncodingProber::Greek:
return "Greek";
break;
case QEncodingProber::Hebrew:
return "Hebrew";
break;
case QEncodingProber::Japanese:
return "Japanese";
break;
case QEncodingProber::Turkish:
return "Turkish";
break;
case QEncodingProber::WesternEuropean:
return "Western European";
break;
case QEncodingProber::ChineseTraditional:
return "Chinese Traditional";
break;
case QEncodingProber::ChineseSimplified:
return "Chinese Simplified";
break;
case QEncodingProber::Korean:
return "Korean";
break;
case QEncodingProber::Thai:
return "Thai";
break;
case QEncodingProber::Unicode:
return "Unicode";
break;
default:
return QString();
}
}
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