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/** \file QTarDecode.cpp
\brief To read a tar data block
\author alpha_one_x86
\version 0.3
\date 2010
\licence GPL3, see the file COPYING */
#include "QTarDecode.h"
#include <QDebug>
QTarDecode::QTarDecode()
{
error="Unknow error";
}
QString QTarDecode::errorString()
{
return error;
}
void QTarDecode::setErrorString(QString error)
{
this->error=error;
fileList.clear();
dataList.clear();
}
bool QTarDecode::decodeData(QByteArray data)
{
setErrorString("Unknow error");
if(data.size()<1024)
return false;
int offset=0;
while(offset<data.size())
{
//load the file name from ascii, from 0+offset with size of 100
QString fileName=data.mid(0+offset,100);
//load the file type
QString fileType=data.mid(156+offset,1);
//load the ustar string
QString ustar=data.mid(257+offset,5);
//load the ustar version
QString ustarVersion=data.mid(263+offset,2);
bool ok;
//load the file size from ascii, from 124+offset with size of 12
int finalSize=QString(data.mid(124+offset,12)).toUInt(&ok,8);
//if the size conversion to qulonglong have failed, then qui with error
if(ok==false)
{
//if((offset+1024)==data.size())
//it's the end of the archive, no more verification
break;
/*else
{
setErrorString("Unable to convert ascii size at "+QString::number(124+offset)+" to usigned long long: \""+QString(data.mid(124+offset,12))+"\"");
return false;
}*/
}
//if check if the ustar not found
if(ustar!="ustar")
{
setErrorString("\"ustar\" string not found at "+QString::number(257+offset)+", content: \""+ustar+"\"");
return false;
}
if(ustarVersion!="00")
{
setErrorString("ustar version string is wrong, content:\""+ustarVersion+"\"");
return false;
}
//check if the file have the good size for load the data
if((offset+512+finalSize)>data.size())
{
setErrorString("The tar file seem be too short");
return false;
}
if(fileType=="0") //this code manage only the file, then only the file is returned
{
QByteArray fileData=data.mid(512+offset,finalSize);
fileList << fileName;
dataList << fileData;
}
//calculate the offset for the next header
bool retenu=((finalSize%512)!=0);
//go to the next header
offset+=512+(finalSize/512+retenu)*512;
}
if(fileList.size()>0)
{
QString baseDirToTest=fileList.at(0);
baseDirToTest.remove(QRegExp("/.*$"));
baseDirToTest+='/';
bool isFoundForAllEntries=true;
for (int i = 0; i < fileList.size(); ++i)
if(!fileList.at(i).startsWith(baseDirToTest))
isFoundForAllEntries=false;
if(isFoundForAllEntries)
for (int i = 0; i < fileList.size(); ++i)
fileList[i].remove(0,baseDirToTest.size());
}
return true;
}
QStringList QTarDecode::getFileList()
{
return fileList;
}
QList<QByteArray> QTarDecode::getDataList()
{
return dataList;
}
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