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