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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2007 Jos van den Oever <jos@vandenoever.info>
*
* 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 <strigi/strigiconfig.h>
#include <strigi/analysisresult.h>
#include <strigi/fieldtypes.h>
#include <strigi/textutils.h>
#include <strigi/streamthroughanalyzer.h>
#include <strigi/analyzerplugin.h>
#include <string.h>
// this version does not extract comment at the moment
// read http://www.w3.org/Graphics/GIF/spec-gif89a.txt on how to do that
using namespace std;
using namespace Strigi;
namespace Strigi {
class RegisteredField;
}
class GifThroughAnalyzerFactory;
class STRIGI_PLUGIN_API GifThroughAnalyzer
: public Strigi::StreamThroughAnalyzer {
private:
Strigi::AnalysisResult* analysisResult;
const GifThroughAnalyzerFactory* factory;
public:
GifThroughAnalyzer(const GifThroughAnalyzerFactory* f) :factory(f) {}
~GifThroughAnalyzer() {}
void setIndexable(Strigi::AnalysisResult* i);
Strigi::InputStream *connectInputStream(Strigi::InputStream *in);
bool isReadyWithStream();
const char* name() const { return "GifThroughAnalyzer"; }
};
class GifThroughAnalyzerFactory
: public Strigi::StreamThroughAnalyzerFactory {
friend class GifThroughAnalyzer;
private:
const Strigi::RegisteredField* colorDepthField;
const Strigi::RegisteredField* widthField;
const Strigi::RegisteredField* heightField;
const Strigi::RegisteredField* typeField;
const char* name() const {
return "GifThroughAnalyzer";
}
Strigi::StreamThroughAnalyzer* newInstance() const {
return new GifThroughAnalyzer(this);
}
void registerFields(Strigi::FieldRegister&);
};
// AnalyzerFactory
void
GifThroughAnalyzerFactory::registerFields(FieldRegister& reg) {
colorDepthField = reg.registerField(
"http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#colorDepth");
widthField = reg.registerField(
"http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#width");
heightField = reg.registerField(
"http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#height");
typeField = reg.typeField;
addField(colorDepthField);
addField(widthField);
addField(heightField);
addField(typeField);
}
// Analyzer
void
GifThroughAnalyzer::setIndexable(AnalysisResult* i) {
analysisResult = i;
}
InputStream*
GifThroughAnalyzer::connectInputStream(InputStream* in) {
if (in == 0) return 0;
const char* buf;
int32_t nread = in->read(buf, 12, -1);
in->reset(0);
if (nread < 12 || strncmp(buf, "GIF8", 4) || buf[5] != 'a'
|| (buf[4] != '7' && buf[4] != '9')) {
return in;
}
uint16_t width = readLittleEndianUInt16(buf+6);
uint16_t height = readLittleEndianUInt16(buf+8);
analysisResult->addValue(factory->widthField, (uint32_t)width);
analysisResult->addValue(factory->heightField, (uint32_t)height);
if (buf[4] == 7) {
uint8_t colorDepth = (uint8_t)((buf[9] & 0x07) + 1);
analysisResult->addValue(factory->colorDepthField, (uint32_t)colorDepth);
}
analysisResult->addValue(factory->typeField, "http://www.semanticdesktop.org/ontologies/2007/03/22/nfo#RasterImage");
return in;
}
bool
GifThroughAnalyzer::isReadyWithStream() {
return true;
}
//Factory
class Factory : public AnalyzerFactoryFactory {
public:
list<StreamThroughAnalyzerFactory*>
streamThroughAnalyzerFactories() const {
list<StreamThroughAnalyzerFactory*> af;
af.push_back(new GifThroughAnalyzerFactory());
return af;
}
};
STRIGI_ANALYZER_FACTORY(Factory)
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