qt-everywhere-src-5.14.1/qtbase/examples/widgets/tools/codecs/previewform.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** 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 "previewform.h"

 #include <QApplication>
 #include <QComboBox>
 #include <QDialogButtonBox>
 #include <QGridLayout>
 #include <QLabel>
 #include <QPlainTextEdit>
 #include <QPushButton>
 #include <QScreen>
 #include <QTextCodec>
 #include <QTextStream>

 // 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 (const char c : data) {
         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);

     connect(encodingComboBox, QOverload<int>::of(&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 = screen()->geometry();
     resize(screenGeometry.width() * 2 / 5, screenGeometry.height() / 2);
 }

 void PreviewForm::setCodecList(const QVector<QTextCodec *> &list)
 {
     encodingComboBox->clear();
     for (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", nullptr, state.invalidChars).arg(name));
         statusLabel->setStyleSheet(QStringLiteral("background-color: \"yellow\";"));
     } else {
         statusLabel->setText(tr("%1: %n bytes converted", nullptr, encodedData.size()).arg(name));
         statusLabel->setStyleSheet(QString());
     }
     if (success)
         textEdit->setPlainText(decodedStr);
     else
         textEdit->clear();
     okButton->setEnabled(success);
 }
	/****************************************************************************
	**
	** 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 "previewform.h"

	#include <QApplication>
	#include <QComboBox>
	#include <QDialogButtonBox>
	#include <QGridLayout>
	#include <QLabel>
	#include <QPlainTextEdit>
	#include <QPushButton>
	#include <QScreen>
	#include <QTextCodec>
	#include <QTextStream>

	// 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 (const char c : data) {
	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);

	connect(encodingComboBox, QOverload<int>::of(&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 = screen()->geometry();
	resize(screenGeometry.width() * 2 / 5, screenGeometry.height() / 2);
	}

	void PreviewForm::setCodecList(const QVector<QTextCodec *> &list)
	{
	encodingComboBox->clear();
	for (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", nullptr, state.invalidChars).arg(name));
	statusLabel->setStyleSheet(QStringLiteral("background-color: \"yellow\";"));
	} else {
	statusLabel->setText(tr("%1: %n bytes converted", nullptr, encodedData.size()).arg(name));
	statusLabel->setStyleSheet(QString());
	}
	if (success)
	textEdit->setPlainText(decodedStr);
	else
	textEdit->clear();
	okButton->setEnabled(success);
	}