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Diffstat (limited to 'examples/network/torrent/bencodeparser.cpp')
| -rw-r--r-- | examples/network/torrent/bencodeparser.cpp | 235 |
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 index 0000000..9311c0c --- /dev/null +++ b/examples/network/torrent/bencodeparser.cpp @@ -0,0 +1,235 @@ +/**************************************************************************** +** +** 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; +} |