Calculate MD5 sum of a big file

[realdarkman71]

Hi all,

I need a md5 sum of a file with a big size. I found this:

QFile file("/home/chris/backup.img");
 
    if (file.open(QIODevice::ReadOnly)) {
        QByteArray fileData = file.readAll();
        QByteArray hashData = QCryptographicHash::hash(fileData, QCryptographicHash::Md5);
 
        qDebug() << hashData.toHex();
    }

QFile file("/home/chris/backup.img");

    if (file.open(QIODevice::ReadOnly)) {
        QByteArray fileData = file.readAll();
        QByteArray hashData = QCryptographicHash::hash(fileData, QCryptographicHash::Md5);

        qDebug() << hashData.toHex();
    }

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but with a file size > 8 GB it's a memory overkill!

Are there any other methods?

Thanks!
Chris