QT large file generation MD5 check code

Common types
enumeration QCryptographicHash::Algorithm：
QCryptographicHash::Md4 0 Generate a MD4 hash
QCryptographicHash::Md5 1 Generate a MD5 hash
QCryptographicHash::Sha1 2 Generate a SHA-1 hash
QCryptographicHash::Sha224 3 Generate a SHA-224 hash （SHA-2）
QCryptographicHash::Sha256 4 Generate a SHA-256 hash （SHA-2）
QCryptographicHash::Sha384 5 Generate a SHA-384 hash （SHA-2）
QCryptographicHash::Sha512 6 Generate a SHA-512 hash （SHA-2）
QCryptographicHash::Sha3_224 7 Generate a SHA3-224 hash
QCryptographicHash::Sha3_256 8 Generate a SHA3-256 hash
QCryptographicHash::Sha3_384 9 Generate a SHA3-384 hash
QCryptographicHash::Sha3_512 10 Generate a SHA3-512 hash

QString MakeMd5(const QString &sourceFilePath)
{
    QFile sourceFile(sourceFilePath);
    qint64 fileSize = sourceFile.size();
    const qint64 bufferSize = 1024*10;

    if (sourceFile.open(QIODevice::ReadOnly)) {
        char buffer[bufferSize];
        int bytesRead;
        int readSize = qMin(fileSize, bufferSize);

        QCryptographicHash hash(QCryptographicHash::Md5);

        while (readSize > 0 && (bytesRead = sourceFile.read(buffer, readSize)) > 0) {
            fileSize -= bytesRead;
            hash.addData(buffer, bytesRead);
            readSize = qMin(fileSize, bufferSize);
        }

        sourceFile.close();
        return QString(hash.result().toHex());
    }
    return QString();
}