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#include <QFile>
#include "torrentparser.h"
TorrentParser::TorrentParser(const QString file, QObject *parent) : QObject(parent), mFile(file), mPos(0), mOk(true) {}
const QList<QVariant> TorrentParser::parse(){
QFile f(mFile);
QList<QVariant> retval;
if(f.size() > 4*1024*1024){ //this is an arbitray value
mLastError = tr("File is too big!");
return retval;
}
f.open(QIODevice::ReadOnly);
mData = f.readAll();
f.close();
while(mPos < mData.size()){
retval << parseObject();
}
return retval;
}
const QVariant TorrentParser::parseObject(){
QChar cur = mData.at(mPos);
if(cur == 'i'){
return parseInt();
}
if(cur == 'l'){
return parseList();
}
if(cur == 'd'){
return parseDict();
}
if(cur.isNumber()){
return parseString();
}
++mPos;
return QVariant();
}
const QByteArray TorrentParser::parseString(){
int lenlen = mData.indexOf(':', mPos) - mPos;
if(lenlen <= 0){
mOk = false;
return QByteArray();
}
int len = mData.mid(mPos, lenlen).toInt();
if(mPos + len > mData.size()){
mOk = false;
return QByteArray();
}
mPos = mPos + lenlen + 1;
QByteArray retval = mData.mid(mPos, len);
mPos += len;
return retval;
}
int TorrentParser::parseInt(){
if(mData.at(mPos) != 'i'){
return 0;
}
++mPos;
int len = mData.indexOf('e', mPos) - mPos;
if(len <= 0){
return 0;
}
int retval = mData.mid(mPos, len).toInt();
mPos = mPos + len + 1;
return retval;
}
const QList<QVariant> TorrentParser::parseList(){
if(mData.at(mPos) != 'l'){
return QList<QVariant>();
}
++mPos;
QList<QVariant> retval;
while(mData.at(mPos) != 'e'){
retval.append(parseObject());
}
++mPos;
return retval;
}
const QHash<QString,QVariant> TorrentParser::parseDict(){
QHash<QString,QVariant> retval;
if(mData.at(mPos) != 'd'){
return retval;
}
++mPos;
while(mData.at(mPos) != 'e'){
QString key = parseString();
QVariant value = parseObject();
if(key.isEmpty() || value.isNull()){
return retval;
}
retval.insert(key, value);
}
++mPos;
return retval;
}
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