[KPhotoAlbum] Breaking changes in file layout

[Martin Höller]

Am 06. Apr. 2020 schrieb Martin Höller:

> Am 06. Apr. 2020 schrieb Tobias Leupold:
> 
> > What about this one:
> > 
> >     QString Whatever::dbIdentifier(const QString &indexXml) const
> >     {
> >         const QFileInfo fileInfo(indexXml);
> >         const QByteArray bytes(fileInfo.canonicalPath().toUtf8());
> >         return QStringLiteral("%1-%2").arg(
> >             QString::number(qChecksum(bytes.data(), bytes.size(),
> >                             Qt::ChecksumIso3309)),
> >             fileInfo.dir().dirName());
> >     }
> > 
> > Gives me e. g. "60243-Fotoalbum" for my "/home/tobias/Fotoalbum/index.xml".  
> 
> That's what I was thinking about.
> 
> I don't know ISO-3309 but this would also be possible with MD5/SHA/etc.:
> https://stackoverflow.com/questions/16383392/how-to-get-the-sha-1-md5-checksum-of-a-file-with-qt
> 
> BTW, this link also uses an ID and a title like suggested.

We don't need the hash of a file but only of a string, so this
code-snippet is more relevant and much shorter:
https://stackoverflow.com/questions/5495281/generating-a-md5-hash-with-qt

hth,
- martin
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