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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include "previewform.h"
// Helpers for creating hex dumps
static void indent(QTextStream &str, int indent)
{
for (int i = 0; i < indent; ++i)
str << ' ';
}
static void formatHex(QTextStream &str, const QByteArray &data)
{
const int fieldWidth = str.fieldWidth();
const QTextStream::FieldAlignment alignment = str.fieldAlignment();
const int base = str.integerBase();
const QChar padChar = str.padChar();
str.setIntegerBase(16);
str.setPadChar(QLatin1Char('0'));
str.setFieldAlignment(QTextStream::AlignRight);
const unsigned char *p = reinterpret_cast<const unsigned char *>(data.constBegin());
for (const unsigned char *end = p + data.size(); p < end; ++p) {
str << ' ';
str.setFieldWidth(2);
str << unsigned(*p);
str.setFieldWidth(fieldWidth);
}
str.setFieldAlignment(alignment);
str.setPadChar(padChar);
str.setIntegerBase(base);
}
static void formatPrintableCharacters(QTextStream &str, const QByteArray &data)
{
for (int i = 0, size = data.size(); i < size; ++i) {
const char c = data.at(i);
switch (c) {
case '\0':
str << "\\0";
break;
case '\t':
str << "\\t";
break;
case '\r':
str << "\\r";
break;
case '\n':
str << "\\n";
break;
default:
if (c >= 32 && uchar(c) < 127)
str << ' ' << c;
else
str << "..";
break;
}
}
}
static QString formatHexDump(const QByteArray &data)
{
enum { lineWidth = 16 };
QString result;
QTextStream str(&result);
str.setIntegerBase(16);
str.setPadChar(QLatin1Char('0'));
const int fieldWidth = str.fieldWidth();
const QTextStream::FieldAlignment alignment = str.fieldAlignment();
for (int a = 0, size = data.size(); a < size; a += lineWidth) {
str.setFieldAlignment(QTextStream::AlignRight);
str.setFieldWidth(8);
str << a;
str.setFieldWidth(fieldWidth);
str.setFieldAlignment(alignment);
const int end = qMin(a + lineWidth, size);
const QByteArray line = data.mid(a, end - a);
formatHex(str, line);
indent(str, 3 * (lineWidth - line.size()));
str << ' ';
formatPrintableCharacters(str, line);
indent(str, 2 * (lineWidth - line.size()));
str << '\n';
}
return result;
}
PreviewForm::PreviewForm(QWidget *parent)
: QDialog(parent)
{
setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
encodingComboBox = new QComboBox;
QLabel *encodingLabel = new QLabel(tr("&Encoding:"));
encodingLabel->setBuddy(encodingComboBox);
textEdit = new QPlainTextEdit;
textEdit->setLineWrapMode(QPlainTextEdit::NoWrap);
textEdit->setReadOnly(true);
hexDumpEdit = new QPlainTextEdit;
hexDumpEdit->setLineWrapMode(QPlainTextEdit::NoWrap);
hexDumpEdit->setReadOnly(true);
hexDumpEdit->setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
QDialogButtonBox *buttonBox =
new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
okButton = buttonBox->button(QDialogButtonBox::Ok);
typedef void(QComboBox::*ComboBoxIntSignal)(int);
connect(encodingComboBox, static_cast<ComboBoxIntSignal>(&QComboBox::activated),
this, &PreviewForm::updateTextEdit);
connect(buttonBox, &QDialogButtonBox::accepted, this, &QDialog::accept);
connect(buttonBox, &QDialogButtonBox::rejected, this, &QDialog::reject);
QGridLayout *mainLayout = new QGridLayout(this);
mainLayout->addWidget(encodingLabel, 0, 0);
mainLayout->addWidget(encodingComboBox, 0, 1);
tabWidget = new QTabWidget;
tabWidget->addTab(textEdit, tr("Preview"));
tabWidget->addTab(hexDumpEdit, tr("Hex Dump"));
mainLayout->addWidget(tabWidget, 1, 0, 1, 2);
statusLabel = new QLabel;
mainLayout->addWidget(statusLabel, 2, 0, 1, 2);
mainLayout->addWidget(buttonBox, 3, 0, 1, 2);
const QRect screenGeometry = QApplication::desktop()->screenGeometry(this);
resize(screenGeometry.width() * 2 / 5, screenGeometry.height() / 2);
}
void PreviewForm::setCodecList(const QList<QTextCodec *> &list)
{
encodingComboBox->clear();
foreach (const QTextCodec *codec, list) {
encodingComboBox->addItem(QLatin1String(codec->name()),
QVariant(codec->mibEnum()));
}
}
void PreviewForm::reset()
{
decodedStr.clear();
textEdit->clear();
hexDumpEdit->clear();
statusLabel->clear();
statusLabel->setStyleSheet(QString());
okButton->setEnabled(false);
tabWidget->setCurrentIndex(0);
}
void PreviewForm::setEncodedData(const QByteArray &data)
{
reset();
encodedData = data;
hexDumpEdit->setPlainText(formatHexDump(data));
updateTextEdit();
}
void PreviewForm::updateTextEdit()
{
int mib = encodingComboBox->itemData(
encodingComboBox->currentIndex()).toInt();
const QTextCodec *codec = QTextCodec::codecForMib(mib);
const QString name = QLatin1String(codec->name());
QTextCodec::ConverterState state;
decodedStr = codec->toUnicode(encodedData.constData(), encodedData.size(), &state);
bool success = true;
if (state.remainingChars) {
success = false;
const QString message =
tr("%1: conversion error at character %2")
.arg(name).arg(encodedData.size() - state.remainingChars + 1);
statusLabel->setText(message);
statusLabel->setStyleSheet(QStringLiteral("background-color: \"red\";"));
} else if (state.invalidChars) {
statusLabel->setText(tr("%1: %n invalid characters", 0, state.invalidChars).arg(name));
statusLabel->setStyleSheet(QStringLiteral("background-color: \"yellow\";"));
} else {
statusLabel->setText(tr("%1: %n bytes converted", 0, encodedData.size()).arg(name));
statusLabel->setStyleSheet(QString());
}
if (success)
textEdit->setPlainText(decodedStr);
else
textEdit->clear();
okButton->setEnabled(success);
}
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