util.cpp

#include "util.h"
#include <QCryptographicHash>
#include <QFileInfo>

QString nowTs(){
    return QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");
}

QString fileSizeHuman(qint64 b){
    static const QStringList u = {"B","KB","MB","GB","TB"};
    int i=0; double v=b;
    while(v>1024.0 && i<u.size()-1){ v/=1024.0; ++i; }
    int prec = (i==0?0:(v<10?2:(v<100?1:0)));
    return QString("%1 %2").arg(QString::number(v, 'f', prec)).arg(u[i]);
}

QString sha256File(const QString &path){
    QFile f(path);
    if(!f.open(QIODevice::ReadOnly)) return QString();
    QCryptographicHash h(QCryptographicHash::Sha256);
    while(!f.atEnd()) h.addData(f.read(1<<20));
    return h.result().toHex();
}

bool isLikelyImage(const QString& path){
    QImageReader r(path);
    return !r.format().isEmpty();
}

QString sanitizeCsv(QString s){
    s.replace("\"","\"\"");
    if (s.contains(',') || s.contains('"') || s.contains('\n')) s="\""+s+"\"";
    return s;
}