File indexing completed on 2024-05-19 05:55:47

 /*
     SPDX-FileCopyrightText: 2016 Rafał Rzepecki <divided.mind@gmail.com>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 */
 
 #include "kwhexview.h"
 
 #include <QTextStream>
 
 KWHexView::KWHexView(QWidget* parent): QPlainTextEdit(parent)
 {
     setReadOnly(true);
     setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
     setWordWrapMode(QTextOption::NoWrap);
 }
 
 enum { hexStride = 4 };
 
 template<class It>
 static QString toHex(It it, It end)
 {
     QString text;
     QTextStream ts(&text);
 
     ts <<
           Qt::hex
        << qSetFieldWidth(2) << qSetPadChar(QLatin1Char('0'));
 
     while (it < end) {
         const auto sEnd = qMin(it + hexStride, end);
         while (it < sEnd)
             ts << static_cast<quint8>(*(it++));
         ts << qSetFieldWidth(0) << " " << qSetFieldWidth(2);
     }
 
     return text;
 }
 
 template<class It>
 static QString toText(It begin, It end)
 {
     QString text = QString::fromLatin1(begin, end - begin);
 
     for (auto &ch: text)
         if (!ch.isPrint()) ch = QLatin1Char('.');
 
     return text;
 }
 
 int KWHexView::calculateStride()
 {
     const auto w = viewport()->width();
     const auto em = fontMetrics().averageCharWidth();
     const auto chars =  w / em - 1;
     auto stride =  chars / 3 / hexStride * hexStride;
 
     while (stride * 3 + (stride / hexStride) + 1 > chars)
         stride -= hexStride;
 
     return qMax(static_cast<int>(hexStride), stride);
 }
 
 void KWHexView::setData(const QByteArray& ba)
 {
     data = ba;
     showData();
 }
 
 void KWHexView::showData()
 {
     QString text;
     QTextStream ts(&text);
 
     ts << Qt::left;
 
     const auto stride = calculateStride();
     const auto hexwidth = stride * 2 + (stride / hexStride) + 1;
 
     for (auto it = data.begin(); it < data.end(); it += stride) {
         auto end = qMin(it + stride, data.end());
         ts << qSetFieldWidth(hexwidth) << toHex(it, end);
         ts << qSetFieldWidth(0) << toText(it, end) << QLatin1Char('\n');
     }
     ts.flush();
     setPlainText(text);
 }
 
 void KWHexView::resizeEvent(QResizeEvent* e)
 {
     QPlainTextEdit::resizeEvent(e);
     if (e->size() != e->oldSize()) showData();
 }
 
 #include "moc_kwhexview.cpp"