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/* This file is part of the KDE project
* Copyright (C) 2002 Matthias Witzgall <[email protected]>
*
* 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 version 2.
*
* 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/* further informations about the dvi file format could be downloaded from: http://www.rpi.edu/~sofkam/DVI/archive/standards/dvistd0.dvi */
#include "kfile_dvi.h"
#include <kgenericfactory.h>
#include <kdebug.h>
#include <klocale.h>
#include <kfilemetainfo.h>
#include <qstring.h>
#include <qvariant.h>
#include <qdatetime.h>
#include <qfile.h>
#include <qfileinfo.h>
#include <qregexp.h>
// preprocessormacro K_EXPORT_COMPONENT_FACTORY loads shared library 'kfile_dvi.so' dynamic if necessary
typedef KGenericFactory<KDviPlugin> DviFactory;
K_EXPORT_COMPONENT_FACTORY(kfile_dvi, DviFactory("kfile_dvi"))
KDviPlugin::KDviPlugin (QObject * parent, const char * name, const QStringList & preferredItems)
: KFilePlugin(parent, name, preferredItems)
{
kdDebug(7034) << "dvi plugin" << endl;
// set up our mime type
KFileMimeTypeInfo * info = this->addMimeTypeInfo("application/x-dvi");
KFileMimeTypeInfo::GroupInfo * group = this->addGroupInfo(info, "General", "General");
this->addItemInfo(group, "3_Created", i18n("Created"), QVariant::String);
this->addItemInfo(group, "6_Comment", i18n("Comment"), QVariant::String);
this->addItemInfo(group, "7_Pages", i18n("Pages"), QVariant::UInt);
}
bool KDviPlugin::readInfo (KFileMetaInfo & info, uint /* what (unused in this plugin) */)
{
if ( info.path().isEmpty() )
return false;
KFileMetaInfoGroup GeneralGroup = appendGroup(info, "General");
QFile f(info.path());
QFileInfo f_info;
Q_UINT16 bytes_to_read;
Q_UINT8 comment_length;
QString comment;
Q_UINT16 pages;
Q_UINT8 buffer[270]; // buffer for reading data; no data is read with more than 270 bytes
Q_UINT32 ptr;
int i; // running index
// open file and try to get the comment
f.open(IO_ReadOnly);
if ( f.isOpen() == false ){
kdDebug(7034) << "cannot open file" << endl;
return false;
}
f_info.setFile(f); // create fileinfoobject
bytes_to_read = QMIN(f_info.size(), 270); // check, if the file size is smaller than 270 bytes
// (if the comment is as large as possible, we don't have to
// read more than 270 bytes)
if ( f.readBlock((char *)buffer, bytes_to_read) != bytes_to_read ){ // cast to (char *) is necessary
kdDebug(7034) << "read error (1)" << endl;
return false;
}
if ( (buffer[0] != 247) || (buffer[1] != 2) ){
// magic numbers are not right
kdDebug(7034) << "wrong file format" << endl;;
return false;
}
comment_length = buffer[14]; // set up length of comment
comment.setLength(comment_length); // used to avoid permanent reallocation when extracting the comment from buffer
for ( i = 15; i <= 14+comment_length; ++i ) // extract comment from buffer
comment[i-15] = (char)buffer[i];
appendItem(GeneralGroup, "6_Comment", comment.simplifyWhiteSpace() );
// comment is ok, now get total number of pages
f.at( f.size() - 13);
if ( f.readBlock((char *)buffer, 13) != 13 ){
kdDebug(7034) << "read error (2)" << endl;
return false;
}
i = 12; // reset running index i
while ( buffer[i] == 223 ){ --i; } // skip all trailing bytes
if ( (buffer[i] != 2) || (i > 8) || (i < 5) ){
kdDebug(7034) << "wrong file formatx" << endl;
return false;
}
// now we know the position of the pointer to the beginning of the postamble and we can read it
ptr = buffer[i-4];
ptr = (ptr << 8) | buffer[i-3];
ptr = (ptr << 8) | buffer[i-2];
ptr = (ptr << 8) | buffer[i-1];
// bytes for total number of pages have a offset of 27 to the beginning of the postamble
f.at(ptr + 27);
// now read total number of pages from file
if ( f.readBlock((char *)buffer, 2) != 2 ){
kdDebug(7034) << "read error (3)" << endl;
return false;
}
pages = buffer[0];
pages = (pages << 8) | buffer[1];
appendItem(GeneralGroup, "7_Pages", QVariant(pages) );
f.close();
// now get and set up some basic informations about the file (same informations would be displayed, if there is no dvi-plugin)
appendItem(GeneralGroup, "1_Type", QVariant( i18n("TeX Device Independent file") ) ); // set up type of file
appendItem(GeneralGroup, "4_Modified", QVariant(f_info.lastModified().toString("yyyy-MM-dd hh:mm")) );
// ISO 8601 date format (without seconds)
return true;
}
#include "kfile_dvi.moc"
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