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/*
* Copyright 2016 Rafał Rzepecki <divided.mind@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#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 <<
#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
hex
#else
Qt::hex
#endif
<< 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);
#if (QT_VERSION < QT_VERSION_CHECK(5, 15, 0))
ts << left;
#else
ts << Qt::left;
#endif
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();
}
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