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<title>Qt 4.2: bencodeparser.cpp Example File (network/torrent/bencodeparser.cpp)</title>
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<pre> /****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
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#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;
}</pre>
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