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/***************************************************************************
* Copyright (C) 2004 by Martin Koller *
* m.koller@surfeu.at *
* *
* This function reads the content of a M$-Windoze .lnk file *
* and returns data in the given structure. *
* *
* 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 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., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
***************************************************************************/
#include "read_lnk.h"
#include <stdio.h>
#include <kdebug.h>
#include <kio/netaccess.h>
//--------------------------------------------------------------------------------
//TODO: little/big endian problem ?
struct LNKHeader
{
char magic[4];
char GUID[16];
Q_UINT32 flags;
Q_UINT32 attributes;
char time1[8];
char time2[8];
char time3[8];
Q_UINT32 length;
Q_UINT32 iconNum;
Q_UINT32 showWnd;
Q_UINT32 hotKey;
char filler[8];
};
struct LNKFileLocation
{
Q_UINT32 totalLen;
Q_UINT32 ptr;
Q_UINT32 flags;
Q_UINT32 localVolume;
Q_UINT32 basePath;
Q_UINT32 netVolume;
Q_UINT32 pathname;
};
//--------------------------------------------------------------------------------
bool readLNK(const KURL &url, LNKInfo &info)
{
const char* lnkFile = 0;
QString tempFile;
if ( KIO::NetAccess::download(url, tempFile, 0) )
lnkFile = tempFile.latin1();
else
return false;
kdDebug(7034) << "opening:" << lnkFile << endl;
FILE *fd = fopen(lnkFile, "rb");
if ( !fd )
{
kdWarning(7034) << "could not open file " << lnkFile << endl;
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
LNKHeader header;
if ( fread(&header, sizeof(header), 1, fd) != 1 )
{
kdWarning(7034) << "wrong header size" << endl;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
if ( memcmp(header.magic, "L\0\0\0", 4) != 0 )
{
kdWarning(7034) << "wrong magic in header" << endl;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
if ( header.flags & 0x1 ) // the shell item id list is present
{
Q_UINT16 len;
// skip that list
if ( (fread(&len, sizeof(len), 1, fd) != 1) || (fseek(fd, len, SEEK_CUR) != 0) )
{
kdWarning(7034) << "could not read shell item id list" << endl;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
}
info.isDirectory = (header.attributes & 0x10);
if ( ! info.isDirectory ) // not a directory
info.fileSize = header.length;
info.isFileOrDir = (header.flags & 0x2); // points to file or directory
if ( info.isFileOrDir )
{
LNKFileLocation loc;
if ( fread(&loc, sizeof(loc), 1, fd) != 1 )
{
kdWarning(7034) << "could not read file localtion table" << endl;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
// limit the following "new", because the size to allocate is in the file
// which can easily be manipulted to contain a huge number and lead to a crash
if ( (loc.totalLen <= sizeof(loc)) || (loc.totalLen > 4096) ) // 4096 is just an arbitrary number I think shall be enough
{
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
size_t size = loc.totalLen - sizeof(loc);
char *data = new char[size];
char *start = data - sizeof(loc);
if ( fread(data, size, 1, fd) != 1 )
{
kdWarning(7034) << "could not read pathes data" << endl;
delete [] data;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
info.isNetworkPath = !(loc.flags & 0x1);
if ( !info.isNetworkPath )
{
info.volumeName = (start + loc.localVolume + 0x10); // volume label
info.path = QString::null;
if ( *(start + loc.basePath) )
{
// Don't put any more than "X:" into info.driveName.
info.driveName = *(start + loc.basePath);
info.driveName += ':';
// If we in fact do have more than just "X:", store any additional
// path information separately in info.path.
if ( *(start + loc.basePath + 1) == ':' &&
*(start + loc.basePath + 2) != 0)
info.path = (start + loc.basePath + 2);
}
if ( *(start + loc.pathname) != 0 )
{
if ( info.path.isNull() )
info.path = (start + loc.pathname);
else
info.path = info.path + "\\" + (start + loc.pathname);
}
}
else // network path
{
info.path = QString("%1\\%2")
.arg(start + loc.netVolume + 0x14) // network share name
.arg(start + loc.pathname);
}
delete [] data;
data = 0;
if ( header.flags & 0x4 ) // has description string
{
Q_UINT16 len;
if ( fread(&len, sizeof(len), 1, fd) != 1 )
{
kdWarning(7034) << "could not read description string length" << endl;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
data = new char[len+1]; // this can never be > 65K, so its OK to not check the size
if ( fread(data, len, 1, fd) != 1 )
{
kdWarning(7034) << "could not read description string" << endl;
delete [] data;
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return false;
}
data[len] = 0; // nullbyte seems to miss
info.description = data;
delete [] data;
}
}
fclose(fd);
KIO::NetAccess::removeTempFile(tempFile);
return true;
}
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