mirror of
https://github.com/RetroShare/RetroShare.git
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87344de7d4
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@1850 b45a01b8-16f6-495d-af2f-9b41ad6348cc
452 lines
13 KiB
C++
452 lines
13 KiB
C++
/****************************************************************************
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***************************Author: Agnit Sarkar******************************
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**************************CopyRight: April 2009******************************
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********************* Email: agnitsarkar@yahoo.co.uk*************************
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****************************************************************************/
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#include "stegosaurus.h"
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StegoSaurus::StegoSaurus(QWidget *parent, Qt::WFlags flags)
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: QDialog(parent, flags)
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{
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ui.setupUi(this);
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bitsAvailable=0;
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sizeofData=0;
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inputFileSize=0;
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}
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StegoSaurus::~StegoSaurus()
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{
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}
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void StegoSaurus::on_btnDryImg_clicked()
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{
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static QString srcImgFileName="/home/";
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srcImgFileName= QFileDialog::getOpenFileName(this, "Open Bitmap", srcImgFileName, "Bitmap Files(*.bmp)");
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if(srcImgFileName.isEmpty()){
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ui.lblDryImgDisplay->setText("<h2>Drag Image Here<br><br>OR<br><br>Select it by browsing<br><br>(BMP Images only)</h2>");
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ui.lblDryImgDisplay->setPixmap(QPixmap(":/StegoSaurus/images/stegosaurus-256x256.png"));
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bitsAvailable=0;
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ui.txtDryImg->setText("");
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ui.lblDryImgInfo->setText("No image Loaded");
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return;
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}
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setDryImage(srcImgFileName);
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}
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void StegoSaurus::on_btnFiletoHide_clicked()
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{
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static QString srcFileName="/home/";
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srcFileName= QFileDialog::getOpenFileName(this, "Open file to hide", srcFileName);
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if(srcFileName.isEmpty()){
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inputFileSize=0;
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ui.txtFiletoHide->setText("");
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ui.lblFiletoHideinfo->setText("No file loaded");
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return;
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}
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//Get File information
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QFileInfo fi= QFileInfo(srcFileName);
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inputFileSize= fi.size();
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ui.txtFiletoHide->setText(srcFileName);
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ui.lblFiletoHideinfo->setText(QString("Size=%L1 bytes").arg(inputFileSize));
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}
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void StegoSaurus::resizeEvent(QResizeEvent * event)
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{
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//Set the label image
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if(ui.txtDryImg->text().isEmpty())
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return;
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QPixmap pixmap(ui.txtDryImg->text());
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pixmap= pixmap.scaledToHeight(ui.lblDryImgDisplay->height());
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ui.lblDryImgDisplay->setPixmap(pixmap);
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QPixmap pixmap2(ui.txtWetImg->text());
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pixmap2= pixmap2.scaledToHeight(ui.lblWetImgDisplay->height());
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ui.lblWetImgDisplay->setPixmap(pixmap2);
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}
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void StegoSaurus::on_btnWetImg_clicked()
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{
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static QString srcImgFileName="/home/";
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srcImgFileName= QFileDialog::getOpenFileName(this, "Open Bitmap", srcImgFileName, "Bitmap Files(*.bmp)");
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if(srcImgFileName.isEmpty()){
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ui.lblWetImgDisplay->setText("<h2>Drag Image Here<br><br>OR<br><br>Select it by browsing<br><br>(BMP Images only)</h2>");
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ui.lblWetImgDisplay->setPixmap(QPixmap(":/StegoSaurus/images/stegosaurus-256x256.png"));
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ui.lblWetImgInfo->setText("No image loaded");
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ui.txtWetImg->setText("");
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sizeofData=0;
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return;
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}
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setWetImage(srcImgFileName);
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}
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void StegoSaurus::setDryImage(const QString &srcImgFileName)
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{
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//Get file info
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dryImage= new QImage(srcImgFileName);
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unsigned int height= dryImage->height();
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unsigned int width= dryImage->width();
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int depth= dryImage->depth();
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//Check the depth, and return if it is not 24-bit
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if(depth<24){
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QMessageBox::information(this, "StegoSaurus", "Must be 24-bit bitmap.");
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ui.txtDryImg->setText("");
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ui.lblDryImgInfo->setText("No image Loaded");
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return;
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}
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//Set the label image
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QPixmap pixmap(srcImgFileName);
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pixmap= pixmap.scaledToHeight(ui.lblDryImgDisplay->height());
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ui.lblDryImgDisplay->setPixmap(pixmap);
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bitsAvailable= height*width*3;
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ui.txtDryImg->setText(srcImgFileName);
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if(bitsAvailable){
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ui.lblDryImgInfo->setText(QString("Height= %L1 Width=%L2 Free Space=%L3 bytes").arg(height)
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.arg(width).arg(bitsAvailable/8));
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}else{
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ui.lblDryImgInfo->setText("No room for data");
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qApp->beep();
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}
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}
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void StegoSaurus::setWetImage(const QString &srcImgFileName)
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{
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//Get file info
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wetImage= new QImage(srcImgFileName);
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unsigned int height= wetImage->height();
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unsigned int width= wetImage->width();
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int depth= wetImage->depth();
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//Check the depth, and return if it is not 24-bit
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if(depth<24){
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QMessageBox::information(this, "StegoSaurus", "Must be 24-bit bitmap.");
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ui.txtWetImg->setText("");
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ui.lblWetImgInfo->setText("No image Loaded");
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return;
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}
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//Set the label image
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QPixmap pixmap(srcImgFileName);
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pixmap= pixmap.scaledToHeight(ui.lblWetImgDisplay->height());
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ui.lblWetImgDisplay->setPixmap(pixmap);
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//Read the size of the embeded data
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QFile imgFile(srcImgFileName);
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if (!imgFile.open(QIODevice::ReadOnly)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to open bitmap file.");
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return;
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}
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if(imgFile.seek(6)){
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imgFile.read((char *)&sizeofData, 4);
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}else{
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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ui.txtWetImg->setText(srcImgFileName);
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if(sizeofData){
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ui.lblWetImgInfo->setText(QString("Height= %L1 Width=%L2 Probable Size of Data=%L3 bytes").arg(height)
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.arg(width).arg(sizeofData));
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}else{
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ui.lblWetImgInfo->setText("No data in image.");
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qApp->beep();
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}
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}
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//The drag and drop methods
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void StegoSaurus::dragEnterEvent(QDragEnterEvent *event)
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{
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if(ui.tabWidget->currentIndex()==2)return;
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if (event->mimeData()->hasFormat("text/uri-list")){
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QList<QUrl> urls = event->mimeData()->urls();
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if (urls.isEmpty())
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return;
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QString fileName = urls.first().toLocalFile();
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//Check the extension
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if (fileName.isEmpty()||!fileName.endsWith(".bmp", Qt::CaseInsensitive))
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return;
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event->acceptProposedAction();
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}
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}
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void StegoSaurus::dropEvent(QDropEvent *event)
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{
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QList<QUrl> urls = event->mimeData()->urls();
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if (urls.isEmpty())
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return;
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QString fileName = urls.first().toLocalFile();
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if (fileName.isEmpty())
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return;
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switch(ui.tabWidget->currentIndex()){
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case 0:
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setDryImage(fileName);
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break;
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case 1:
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setWetImage(fileName);
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break;
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default:
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break;
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}
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}
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//The hide methods
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void StegoSaurus::on_btnHide_clicked()
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{
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//Get the filenames
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QString imgFileName= ui.txtDryImg->text();
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QString inputFileName= ui.txtFiletoHide->text();
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//Check if both image file and data file has been selected
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if(imgFileName.isEmpty()||inputFileName.isEmpty()){
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QMessageBox::information(this, "StegoSaurus", "Please select a bitmap image and a data file.");
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return;
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}
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//Now check if size of the data file is less than that of the space available
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if(inputFileSize*8>bitsAvailable){
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QMessageBox::information(this, "StegoSaurus", "Not enough space available in image to hide the data.");
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return;
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}
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static QString targetImgName="/home/";
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targetImgName= QFileDialog::getSaveFileName(this, "Save bitmap with data to", targetImgName, "Bitmap Files(*.bmp)");
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if(targetImgName.isEmpty())return;
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//If an image file with the same name exists delete it and then copy, unless source and target are same
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if(imgFileName!=inputFileName){
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QFile::remove(targetImgName);
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QFile::copy(imgFileName, targetImgName);
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}
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//Calculate the no. of padding bytes
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unsigned int width= dryImage->width();
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unsigned int padding=0;
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if((width*3)%4==0)
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padding=0;
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unsigned int quotient= (width*3)/4;
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padding= 4*(quotient+1)- width*3;
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/////////////////////////////////Hide the data////////////////////////////////////////////
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QFile inputFile(inputFileName);
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if (!inputFile.open(QIODevice::ReadOnly)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to open data file for reading.");
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return;
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}
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//Stamp the size of the data file to the reserved bytes of the image file
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QFile imgOutputFile(targetImgName);
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if (!imgOutputFile.open(QIODevice::ReadWrite)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to open bitmap file.");
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return;
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}
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if(imgOutputFile.seek(6)){
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imgOutputFile.write((char *)&inputFileSize, 4);
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}else{
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QMessageBox::warning(this, "StegoSaurus", "Unable to write to bitmap file.");
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return;
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}
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//Read the dataoffset of the bitmap
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unsigned int dataoffset=0;
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if(imgOutputFile.seek(10)){
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imgOutputFile.read((char *)&dataoffset, 4);
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}else{
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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//Move by dataoffset bytes
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if(!imgOutputFile.seek(dataoffset)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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QProgressDialog progress("Embedding Data", "Cancel", 0, inputFileSize, this);
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progress.show();
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unsigned int progresscount=0;
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unsigned int countBytes=0;
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while (!inputFile.atEnd()){
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//Read a byte
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unsigned char dataByte=0;
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inputFile.getChar((char *)&dataByte);
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//Store each bit of the data byte in 1 byte of the image pixel
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//starting with the MSB
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for(int i=7; i>=0; i--){
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//Get the bit at position i in the data byte
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unsigned char checkByte= 0x01;
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checkByte= checkByte<<i;
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unsigned char dataBit=(dataByte & checkByte)>>i;
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unsigned char imageByte=0;
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//To ignore the padding bytes
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if(countBytes>=width*3){
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countBytes= 0;
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//Advance the read pointer
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for(int j=0; j<padding; j++){
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imgOutputFile.getChar((char *)&imageByte);
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}
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}
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//Get a pixel byte from the bitmap
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imgOutputFile.getChar((char *)&imageByte);
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//Get the LSB
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checkByte= imageByte & 0x01;
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//Check if the databit and the LSB is different
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if(dataBit!=checkByte){
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//Alter the LSB to the databit
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if(dataBit){
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//If 1 set the LSB
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imageByte= imageByte | 0x01;
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}else{
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//Reset the LSB
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imageByte= imageByte & 0xFE;
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}
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//Get the current pointer position
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int pos= imgOutputFile.pos();
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//Put it back by 1 byte to write the current byte
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if(!imgOutputFile.seek(pos-1)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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//Write the byte
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imgOutputFile.putChar(imageByte);
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}
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countBytes++;
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}
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progresscount++;
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progress.setValue(progresscount);
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if (progress.wasCanceled()){
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QMessageBox::warning(this, "StegoSaurus", "Operation Aborted.");
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imgOutputFile.close();
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inputFile.close();
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return;
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}
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}
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progress.hide();
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//Close the files
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imgOutputFile.close();
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inputFile.close();
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QMessageBox::information(this, "StegoSaurus", "Data Embedded Successfully.");
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}
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//The recover methods
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void StegoSaurus::on_btnRecover_clicked()
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{
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//Get the filename
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QString imgFileName= ui.txtWetImg->text();
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//Check image file has been selected
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if(imgFileName.isEmpty()){
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QMessageBox::information(this, "StegoSaurus", "Please select a bitmap image.");
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return;
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}
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static QString targetFileName="/home/";
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targetFileName= QFileDialog::getSaveFileName(this, "Save recovered data to", targetFileName, "All Files(*.*)");
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if(targetFileName.isEmpty())return;
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//If a file with the same name exists delete it
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QFile::remove(targetFileName);
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//Calculate the no. of padding bytes
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unsigned int width= wetImage->width();
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unsigned int padding=0;
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if((width*3)%4==0)
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padding=0;
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unsigned int quotient= (width*3)/4;
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padding= 4*(quotient+1)- width*3;
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/////////////////////////////////Recover the data////////////////////////////////////////////
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QFile targetFile(targetFileName);
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if (!targetFile.open(QIODevice::WriteOnly)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to open data file.");
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return;
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}
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QFile imgInputFile(imgFileName);
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if (!imgInputFile.open(QIODevice::ReadOnly)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to open bitmap file.");
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return;
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}
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//Read the dataoffset of the bitmap
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unsigned int dataoffset=0;
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if(imgInputFile.seek(10)){
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imgInputFile.read((char *)&dataoffset, 4);
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}else{
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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//Move by dataoffset bytes
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if(!imgInputFile.seek(dataoffset)){
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QMessageBox::warning(this, "StegoSaurus", "Unable to read bitmap file.");
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return;
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}
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QProgressDialog progress("Recovering Data", "Cancel", 0, sizeofData, this);
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progress.show();
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unsigned int progresscount=0;
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unsigned int countBytes=0;
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//Iterate to recover targetFileSize bytes
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for(unsigned int byteNo= 0; byteNo< sizeofData; byteNo++){
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//construct each byte
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unsigned char dataByte= 0x00;
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for(int bitNo=7; bitNo>=0; bitNo--){
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unsigned char imageByte=0xFF;
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//To ignore the padding bytes
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if(countBytes>=width*3){
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countBytes= 0;
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//Advance the read pointer
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for(int j=0; j<padding; j++){
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imgInputFile.getChar((char *)&imageByte);
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}
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}
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//Read a byte from the bitmap file
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imgInputFile.getChar((char *)&imageByte);
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countBytes++;
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//Get the LSB
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unsigned char dataBit= imageByte & 0x01;
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//Set the bit in data byte at bitNo position if databit is set
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if(dataBit){
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unsigned char tempByte= 0x01;
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dataByte= dataByte | (tempByte<<bitNo);
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}
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}
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//Write the byte
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targetFile.putChar(dataByte);
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//Update the progressbar
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progresscount++;
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progress.setValue(progresscount);
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if (progress.wasCanceled()){
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QMessageBox::warning(this, "StegoSaurus", "Operation Aborted.");
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imgInputFile.close();
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targetFile.close();
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return;
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}
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}
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progress.hide();
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//Close the files
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targetFile.close();
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imgInputFile.close();
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QMessageBox::information(this, "StegoSaurus", "Data Recovery Successful.");
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} |