Long live Qt 4.5!

1 files changed, 235 insertions, 0 deletions

diff --git a/examples/network/torrent/bencodeparser.cpp b/examples/network/torrent/bencodeparser.cpp
new file mode 100644
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+++ b/examples/network/torrent/bencodeparser.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "bencodeparser.h"
+
+#include <QList>
+#include <QMetaType>
+
+BencodeParser::BencodeParser()
+{
+}
+
+bool BencodeParser::parse(const QByteArray &content)
+{
+    if (content.isEmpty()) {
+        errString = QString("No content");
+        return false;
+    }
+
+    this->content = content;
+    index = 0;
+    infoStart = 0;
+    infoLength = 0;
+    return getDictionary(&dictionaryValue);
+}
+
+QString BencodeParser::errorString() const
+{
+    return errString;
+}
+
+QMap<QByteArray, QVariant> BencodeParser::dictionary() const
+{
+    return dictionaryValue;
+}
+
+QByteArray BencodeParser::infoSection() const
+{
+    return content.mid(infoStart, infoLength);
+}
+
+bool BencodeParser::getByteString(QByteArray *byteString)
+{
+    const int contentSize = content.size();
+    int size = -1;
+    do {
+	char c = content.at(index);
+	if (c < '0' || c > '9') {
+	    if (size == -1)
+		return false;
+	    if (c != ':') {
+		errString = QString("Unexpected character at pos %1: %2")
+		    .arg(index).arg(c);
+		return false;
+	    }
+	    ++index;
+	    break;
+	}
+	if (size == -1)
+	    size = 0;
+	size *= 10;
+	size += c - '0';
+    } while (++index < contentSize);
+
+    if (byteString)
+	*byteString = content.mid(index, size);
+    index += size;
+    return true;
+}
+
+bool BencodeParser::getInteger(qint64 *integer)
+{
+    const int contentSize = content.size();
+    if (content.at(index) != 'i')
+	return false;
+
+    ++index;
+    qint64 num = -1;
+    bool negative = false;
+
+    do {
+	char c = content.at(index);
+	if (c < '0' || c > '9') {
+	    if (num == -1) {
+		if (c != '-' || negative)
+		    return false;
+		negative = true;
+		continue;
+	    } else {
+		if (c != 'e') {
+		    errString = QString("Unexpected character at pos %1: %2")
+			.arg(index).arg(c);
+		    return false;
+		}
+		++index;
+		break;
+	    }
+	}
+	if (num == -1)
+	    num = 0;
+	num *= 10;
+	num += c - '0';
+    } while (++index < contentSize);
+
+    if (integer)
+	*integer = negative ? -num : num;
+    return true;
+}
+
+bool BencodeParser::getList(QList<QVariant> *list)
+{
+    const int contentSize = content.size();
+    if (content.at(index) != 'l')
+	return false;
+
+    QList<QVariant> tmp;    
+    ++index;
+
+    do {
+	if (content.at(index) == 'e') {
+	    ++index;
+	    break;
+	}
+
+	qint64 number;
+	QByteArray byteString;
+	QList<QVariant> tmpList;
+	QMap<QByteArray, QVariant> dictionary;
+
+	if (getInteger(&number))
+	    tmp << number;
+	else if (getByteString(&byteString))
+	    tmp << byteString;
+	else if (getList(&tmpList))
+	    tmp << tmpList;
+	else if (getDictionary(&dictionary))
+	    tmp << qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary);
+	else {
+	    errString = QString("error at index %1").arg(index);
+	    return false;
+	}
+    } while (index < contentSize);
+
+    if (list)
+	*list = tmp;
+    return true;
+}
+
+bool BencodeParser::getDictionary(QMap<QByteArray, QVariant> *dictionary)
+{
+    const int contentSize = content.size();
+    if (content.at(index) != 'd')
+	return false;
+
+    QMap<QByteArray, QVariant> tmp;    
+    ++index;
+
+    do {
+	if (content.at(index) == 'e') {
+	    ++index;
+	    break;
+	}
+
+	QByteArray key;
+	if (!getByteString(&key))
+	    break;
+
+	if (key == "info")
+	  infoStart = index;
+
+	qint64 number;
+	QByteArray byteString;
+	QList<QVariant> tmpList;
+	QMap<QByteArray, QVariant> dictionary;
+
+	if (getInteger(&number))
+	    tmp.insert(key, number);
+	else if (getByteString(&byteString))
+	    tmp.insert(key, byteString);
+	else if (getList(&tmpList))
+	    tmp.insert(key, tmpList);
+	else if (getDictionary(&dictionary))
+	    tmp.insert(key, qVariantFromValue<QMap<QByteArray, QVariant> >(dictionary));
+	else {
+	    errString = QString("error at index %1").arg(index);
+	    return false;
+	}
+
+	if (key == "info")
+	  infoLength = index - infoStart;
+
+    } while (index < contentSize);
+
+    if (dictionary)
+	*dictionary = tmp;
+    return true;
+}