/* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
 * Software engineering by Intevation GmbH
 *
 * This file is Free Software under the GNU GPL (v>=2)
 * and comes with ABSOLUTELY NO WARRANTY!
 * See LICENSE.txt for details.
 */
#include <QString>
#include <QTemporaryFile>
#include <QDebug>
#include "common.h"

QString getRandomDataFile(size_t size, const QDir &inDir)
{
    QTemporaryFile *tmpfile;
    if (inDir != QDir()) {
        tmpfile = new QTemporaryFile(inDir.path() + "/downloadertest");
    } else {
        tmpfile = new QTemporaryFile();
    }
    tmpfile->setAutoRemove(false);
    tmpfile->open();
    size_t bufsize = 1024 * 1024;
    if (bufsize > size) {
        bufsize = size;
    }
    char buf[bufsize];

    for (size_t i = 0; i < bufsize; i++) {
        buf[i] = (char) qrand() % 255;
    }

    size_t bytesWritten=0;
    int retval = 0;
    do {
        size_t toWrite = size - bytesWritten;
        if (toWrite < bufsize) {
            retval = tmpfile->write(buf, toWrite);
        } else {
            retval = tmpfile->write(buf, bufsize);
        }
        bytesWritten += retval;
    } while (retval != -1 && bytesWritten < size);

    tmpfile->close();
    QString ret = tmpfile->fileName();
    delete tmpfile;
    return ret;
}