exif class added (taken from opie-eye_slave and more c++ like reworked)

it is used in oimageview while loading jpegs checking BEFORE loading if the
image should be scaled loaded.
ToDo: documentation of the interface, remove it from opie-eye_slave (it should
use of course the library version)

4 files changed, 1346 insertions, 6 deletions

diff --git a/libopie2/opiemm/oimagescrollview.cpp b/libopie2/opiemm/oimagescrollview.cpp
index 56be10b..37a1ad5 100644
--- a/libopie2/opiemm/oimagescrollview.cpp
+++ b/libopie2/opiemm/oimagescrollview.cpp
@@ -1,563 +1,569 @@
 #include "oimagescrollview.h"
 
 #include <opie2/oimagezoomer.h>
 #include <opie2/odebug.h>
 #include <opie2/oapplication.h>
 #include <opie2/owait.h>
+#include <opie2/opieexif.h>
 
 #include <qimage.h>
 #include <qlayout.h>
 
 /* for usage with the bitset */
 #define AUTO_SCALE 0
 #define AUTO_ROTATE 1
 #define SHOW_ZOOMER 2
 #define FIRST_RESIZE_DONE 3
 #define IMAGE_IS_JPEG 4
 #define IMAGE_SCALED_LOADED 5
 
 #define SCROLLVIEW_BITSET_SIZE 6
 
 namespace Opie {
 namespace MM {
 OImageScrollView::OImageScrollView( QWidget* parent, const char* name,  WFlags f )
     :QScrollView(parent,name,f|Qt::WRepaintNoErase ),_image_data(),_original_data(),
     m_states(SCROLLVIEW_BITSET_SIZE),m_lastName("")
 {
     _zoomer = 0;
     m_states[AUTO_SCALE]=true;
     m_states[AUTO_ROTATE]=true;
     m_states[FIRST_RESIZE_DONE]=false;
     m_states[IMAGE_IS_JPEG]=false;
     m_states[IMAGE_SCALED_LOADED]=false;
     m_states[SHOW_ZOOMER]=true;
     init();
 }
 
 OImageScrollView::OImageScrollView (const QImage&img, QWidget * parent, const char * name, WFlags f,bool always_scale,bool rfit)
     :QScrollView(parent,name,f|Qt::WRepaintNoErase),_image_data(),_original_data(img),
      m_states(SCROLLVIEW_BITSET_SIZE),m_lastName("")
 {
     _zoomer = 0;
     m_states[AUTO_SCALE]=always_scale;
     m_states[AUTO_ROTATE]=rfit;
     m_states[FIRST_RESIZE_DONE]=false;
     m_states[IMAGE_IS_JPEG]=false;
     m_states[IMAGE_SCALED_LOADED]=false;
     m_states[SHOW_ZOOMER]=true;
     _original_data.convertDepth(QPixmap::defaultDepth());
     _original_data.setAlphaBuffer(false);
     init();
 }
 
 OImageScrollView::OImageScrollView (const QString&img, QWidget * parent, const char * name, WFlags f,bool always_scale,bool rfit)
     :QScrollView(parent,name,f|Qt::WRepaintNoErase),_image_data(),_original_data(),m_states(SCROLLVIEW_BITSET_SIZE),m_lastName("")
 {
     _zoomer = 0;
     m_states.resize(SCROLLVIEW_BITSET_SIZE);
     m_states[AUTO_SCALE]=always_scale;
     m_states[AUTO_ROTATE]=rfit;
     m_states[FIRST_RESIZE_DONE]=false;
     m_states[IMAGE_IS_JPEG]=false;
     m_states[IMAGE_SCALED_LOADED]=false;
     m_states[SHOW_ZOOMER]=true;
     init();
     setImage(img);
 }
 
 void OImageScrollView::setImage(const QImage&img)
 {
     _image_data = QImage();
     _original_data=img;
     _original_data.convertDepth(QPixmap::defaultDepth());
     _original_data.setAlphaBuffer(false);
     m_lastName = "";
     setImageIsJpeg(false);
     setImageScaledLoaded(false);
     if (FirstResizeDone()) {
         generateImage();
     }
 }
 
 void OImageScrollView::loadJpeg(bool interncall)
 {
     if (m_lastName.isEmpty()) return;
     QImageIO iio( m_lastName, 0l );
     QString param;
     bool real_load = false;
     if (AutoScale()) {
         if (!interncall) {
+            ExifData xf;
+            bool scanned = xf.scan(m_lastName);
             int wid, hei;
             wid = QApplication::desktop()->width();
             hei = QApplication::desktop()->height();
             if (hei>wid) {
                 wid = hei;
             } else {
                 hei = wid;
             }
-            param = QString( "Fast Shrink( 3 ) Scale( %1, %2, ScaleMin)" ).arg( wid ).arg( hei );
-            odebug << "Load jpeg scaled \"" << param << "\"" << oendl;
-            iio.setParameters(param.latin1());
-            setImageScaledLoaded(true);
+            if ( (scanned && (wid<xf.getWidth()||hei<xf.getHeight()))||!scanned ) {
+                param = QString( "Fast Shrink( 3 ) Scale( %1, %2, ScaleMin)" ).arg( wid ).arg( hei );
+                odebug << "Load jpeg scaled \"" << param << "\"" << oendl;
+                iio.setParameters(param.latin1());
+                setImageScaledLoaded(true);
+            }
+
             real_load = true;
         }
     } else {
         if (ImageScaledLoaded()||!interncall) {
             odebug << "Load jpeg unscaled" << oendl;
             real_load = true;
         }
         setImageScaledLoaded(false);
     }
     if (real_load) {
         _original_data = iio.read() ? iio.image() : QImage();
     }
 }
 
 void OImageScrollView::setImage( const QString& path ) {
     odebug << "load new image " << oendl;
     if (m_lastName == path) return;
     m_lastName = path;
     _original_data = QImage();
     QString itype = QImage::imageFormat(m_lastName);
     odebug << "Image type = " << itype << oendl;
     if (itype == "JPEG") {
         setImageIsJpeg(true);
         loadJpeg();
     } else {
         setImageIsJpeg(false);
         _original_data.load(path);
         _original_data.convertDepth(QPixmap::defaultDepth());
         _original_data.setAlphaBuffer(false);
     }
     _image_data = QImage();
     if (FirstResizeDone()) {
         generateImage();
         if (isVisible()) viewport()->repaint(true);
     }
 }
 
 /* should be called every time the QImage changed it content */
 void OImageScrollView::init()
 {
     odebug << "init " << oendl;
 
     /*
      * create the zoomer
      * and connect ther various signals
      */
     _zoomer = new Opie::MM::OImageZoomer( this, "The Zoomer" );
     connect(_zoomer, SIGNAL( zoomAreaRel(int,int)),
             this, SLOT(scrollBy(int,int)) );
     connect(_zoomer, SIGNAL( zoomArea(int,int)),
             this, SLOT(center(int,int)) );
     connect(this,SIGNAL(contentsMoving(int,int)),
             _zoomer, (SLOT(setVisiblePoint(int,int))) );
     connect(this,SIGNAL(imageSizeChanged(const QSize&)),
             _zoomer, SLOT(setImageSize(const QSize&)) );
     connect(this,SIGNAL(viewportSizeChanged(const QSize&)),
             _zoomer, SLOT(setViewPortSize(const QSize&)) );
 
     setBackgroundColor(white);
     setFocusPolicy(QWidget::StrongFocus);
     setImageScaledLoaded(false);
     setImageIsJpeg(false);
     if (FirstResizeDone()) {
         m_last_rot = Rotate0;
         generateImage();
     } else if (_original_data.size().isValid()) {
         if (image_fit_into(_original_data.size()) || !ShowZoomer()) _zoomer->hide();
         resizeContents(_original_data.width(),_original_data.height());
     }
 }
 
 void OImageScrollView::setAutoRotate(bool how)
 {
     /* to avoid double repaints */
     if (AutoRotate() != how) {
         m_states.setBit(AUTO_ROTATE,how);
         _image_data = QImage();
         generateImage();
     }
 }
 
 bool OImageScrollView::AutoRotate()const
 {
     return m_states.testBit(AUTO_ROTATE);
 }
 
 void OImageScrollView::setAutoScaleRotate(bool scale, bool rotate)
 {
     m_states.setBit(AUTO_ROTATE,rotate);
     setAutoScale(scale);
 }
 
 void OImageScrollView::setAutoScale(bool how)
 {
     m_states.setBit(AUTO_SCALE,how);
     _image_data = QImage();
     if (ImageIsJpeg() && how == false && ImageScaledLoaded()==true) {
         loadJpeg(true);
     }
     generateImage();
 }
 
 bool OImageScrollView::AutoScale()const
 {
     return m_states.testBit(AUTO_SCALE);
 }
 
 OImageScrollView::~OImageScrollView()
 {
 }
 
 void OImageScrollView::rescaleImage(int w, int h)
 {
     if (_image_data.width()==w && _image_data.height()==h) {
         return;
     }
     double hs = (double)h / (double)_image_data.height() ;
     double ws = (double)w / (double)_image_data.width() ;
     double scaleFactor = (hs > ws) ? ws : hs;
     int smoothW = (int)(scaleFactor * _image_data.width());
     int smoothH = (int)(scaleFactor * _image_data.height());
     _image_data = _image_data.smoothScale(smoothW,smoothH);
 }
 
 void OImageScrollView::rotate_into_data(Rotation r)
 {
     /* realy - we must do this that way, 'cause when acting direct on _image_data the app will
        segfault :( */
     QImage dest;
     int x, y;
     if ( _original_data.depth() > 8 )
     {
         unsigned int *srcData, *destData;
         switch ( r )
         {
             case Rotate90:
                 dest.create(_original_data.height(), _original_data.width(), _original_data.depth());
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned int *)_original_data.scanLine(y);
                     for ( x=0; x < _original_data.width(); ++x )
                     {
                         destData = (unsigned int *)dest.scanLine(x);
                         destData[_original_data.height()-y-1] = srcData[x];
                     }
                 }
                 break;
             case Rotate180:
                 dest.create(_original_data.width(), _original_data.height(), _original_data.depth());
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned int *)_original_data.scanLine(y);
                     destData = (unsigned int *)dest.scanLine(_original_data.height()-y-1);
                     for ( x=0; x < _original_data.width(); ++x )
                         destData[_original_data.width()-x-1] = srcData[x];
                 }
                 break;
             case Rotate270:
                 dest.create(_original_data.height(), _original_data.width(), _original_data.depth());
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned int *)_original_data.scanLine(y);
                     for ( x=0; x < _original_data.width(); ++x )
                     {
                         destData = (unsigned int *)dest.scanLine(_original_data.width()-x-1);
                         destData[y] = srcData[x];
                     }
                 }
                 break;
             default:
                 dest = _original_data;
                 break;
         }
     }
     else
     {
         unsigned char *srcData, *destData;
         unsigned int *srcTable, *destTable;
         switch ( r )
         {
             case Rotate90:
                 dest.create(_original_data.height(), _original_data.width(), _original_data.depth());
                 dest.setNumColors(_original_data.numColors());
                 srcTable = (unsigned int *)_original_data.colorTable();
                 destTable = (unsigned int *)dest.colorTable();
                 for ( x=0; x < _original_data.numColors(); ++x )
                     destTable[x] = srcTable[x];
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned char *)_original_data.scanLine(y);
                     for ( x=0; x < _original_data.width(); ++x )
                     {
                         destData = (unsigned char *)dest.scanLine(x);
                         destData[_original_data.height()-y-1] = srcData[x];
                     }
                 }
                 break;
             case Rotate180:
                 dest.create(_original_data.width(), _original_data.height(), _original_data.depth());
                 dest.setNumColors(_original_data.numColors());
                 srcTable = (unsigned int *)_original_data.colorTable();
                 destTable = (unsigned int *)dest.colorTable();
                 for ( x=0; x < _original_data.numColors(); ++x )
                     destTable[x] = srcTable[x];
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned char *)_original_data.scanLine(y);
                     destData = (unsigned char *)dest.scanLine(_original_data.height()-y-1);
                     for ( x=0; x < _original_data.width(); ++x )
                         destData[_original_data.width()-x-1] = srcData[x];
                 }
                 break;
             case Rotate270:
                 dest.create(_original_data.height(), _original_data.width(), _original_data.depth());
                 dest.setNumColors(_original_data.numColors());
                 srcTable = (unsigned int *)_original_data.colorTable();
                 destTable = (unsigned int *)dest.colorTable();
                 for ( x=0; x < _original_data.numColors(); ++x )
                     destTable[x] = srcTable[x];
                 for ( y=0; y < _original_data.height(); ++y )
                 {
                     srcData = (unsigned char *)_original_data.scanLine(y);
                     for ( x=0; x < _original_data.width(); ++x )
                     {
                         destData = (unsigned char *)dest.scanLine(_original_data.width()-x-1);
                         destData[y] = srcData[x];
                     }
                 }
                 break;
             default:
                 dest = _original_data;
                 break;
         }
 
     }
     _image_data = dest;
 }
 
 void OImageScrollView::generateImage()
 {
     Rotation r = Rotate0;
     _pdata = QPixmap();
     if (_original_data.isNull()) {
         emit imageSizeChanged( _image_data.size() );
         if (_zoomer) _zoomer->setImage( _image_data );
         return;
     }
     if (width()>height()&&_original_data.width()<_original_data.height() ||
         width()<height()&&_original_data.width()>_original_data.height()) {
         if (AutoRotate()) r = Rotate90;
     }
 
     int twidth,theight;
     odebug << " r = " << r << oendl;
     if (AutoScale() && (_original_data.width()>width() || _original_data.height() > height()) ) {
         if (!_image_data.size().isValid()||width()>_image_data.width()||height()>_image_data.height()) {
             odebug << "Rescaling data" << oendl;
             if (r==Rotate0) {
                 _image_data = _original_data;
             } else {
                 rotate_into_data(r);
             }
         }
         rescaleImage(width(),height());
     }  else if (!FirstResizeDone()||r!=m_last_rot||_image_data.width()==0) {
         if (r==Rotate0) {
             _image_data = _original_data;
         } else {
             rotate_into_data(r);
         }
         m_last_rot = r;
     }
     _pdata.convertFromImage(_image_data);
     twidth = _image_data.width();
     theight = _image_data.height();
 
     /*
      * update the zoomer
      */
     check_zoomer();
     emit imageSizeChanged( _image_data.size() );
     rescaleImage( 128, 128 );
     resizeContents(twidth,theight);
     /*
      * move scrollbar
      */
      if (_zoomer) {
         _zoomer->setGeometry( viewport()->width()-_image_data.width()/2, viewport()->height()-_image_data.height()/2,
              _image_data.width()/2, _image_data.height()/2 );
         _zoomer->setImage( _image_data );
      }
     /*
      * invalidate
      */
     _image_data=QImage();
     if (isVisible()) {
         updateContents(contentsX(),contentsY(),width(),height());
     }
 }
 
 void OImageScrollView::resizeEvent(QResizeEvent * e)
 {
     odebug << "OImageScrollView resizeEvent (" << e->size() << " - " << e->oldSize() << oendl;
     QScrollView::resizeEvent(e);
     if (e->oldSize()==e->size()||!isUpdatesEnabled ()) return;
     generateImage();
     setFirstResizeDone(true);
     emit viewportSizeChanged( viewport()->size() );
 
 }
 
 void OImageScrollView::keyPressEvent(QKeyEvent * e)
 {
     if (!e) return;
     int dx = horizontalScrollBar()->lineStep();
     int dy = verticalScrollBar()->lineStep();
     if (e->key()==Qt::Key_Right) {
         scrollBy(dx,0);
         e->accept();
     } else if (e->key()==Qt::Key_Left) {
         scrollBy(0-dx,0);
         e->accept();
     } else if (e->key()==Qt::Key_Up) {
         scrollBy(0,0-dy);
         e->accept();
     } else if (e->key()==Qt::Key_Down) {
         scrollBy(0,dy);
         e->accept();
     } else {
         e->ignore();
     }
     QScrollView::keyPressEvent(e);
 }
 
 void OImageScrollView::drawContents(QPainter * p, int clipx, int clipy, int clipw, int cliph)
 {
     if (!_pdata.size().isValid()) {
         p->fillRect(clipx,clipy,clipw,cliph, backgroundColor());
         return;
     }
 
     int w = clipw;
     int h = cliph;
     int x = clipx;
     int y = clipy;
     bool erase = false;
 
     if (w>_pdata.width()) {
         w = _pdata.width()-x;
         erase=true;
     }
     if (h>_pdata.height()) {
         h = _pdata.height()-y;
         erase=true;
     }
     if (!erase && (clipy+cliph>_pdata.height()||clipx+clipw>_pdata.width())) {
         erase = true;
     }
     if (erase||_original_data.hasAlphaBuffer()) {
         p->fillRect(clipx,clipy,clipw,cliph, backgroundColor());
     }
     if (w>0 && h>0&&x<_pdata.width()&&y<_pdata.height()) {
         p->drawPixmap(clipx,clipy,_pdata,x,y,w,h);
     }
 }
 
 /* using the real geometry points and not the translated points is wanted! */
 void OImageScrollView::viewportMouseMoveEvent(QMouseEvent* e)
 {
     int mx, my;
     mx = e->x();
     my = e->y();
     if (_mouseStartPosX!=-1 && _mouseStartPosY!=-1) {
         int diffx = _mouseStartPosX-mx;
         int diffy = _mouseStartPosY-my;
         scrollBy(diffx,diffy);
     }
     _mouseStartPosX=mx;
     _mouseStartPosY=my;
 }
 
 void OImageScrollView::contentsMousePressEvent ( QMouseEvent * e)
 {
     odebug << " X and Y " << e->x() << " " << e->y() << oendl;
     /* this marks the beginning of a possible mouse move. Due internal reasons of QT
        the geometry values here may real differ from that set in MoveEvent (I don't know
        why). For getting them in real context, we use the first move-event to set the start
        position ;)
     */
     _mouseStartPosX = -1;
     _mouseStartPosY = -1;
 }
 
 void OImageScrollView::setDestructiveClose() {
     WFlags fl = getWFlags();
     /* clear it just in case */
     fl &= ~WDestructiveClose;
     fl |= WDestructiveClose;
     setWFlags( fl );
 }
 
 bool OImageScrollView::image_fit_into(const QSize&s )
 {
     if (s.width()>width()||s.height()>height()) {
         return false;
     }
     return true;
 }
 
 void OImageScrollView::setShowZoomer(bool how)
 {
     m_states.setBit(SHOW_ZOOMER,how);
     check_zoomer();
 }
 
 bool OImageScrollView::ShowZoomer()const
 {
     return m_states.testBit(SHOW_ZOOMER);
 }
 
 void OImageScrollView::check_zoomer()
 {
     if (!_zoomer) return;
     if ( (!ShowZoomer()||image_fit_into(_pdata.size()) ) && _zoomer->isVisible()) {
         _zoomer->hide();
     } else if ( ShowZoomer() && !image_fit_into(_pdata.size()) && _zoomer->isHidden()){
         _zoomer->show();
     }
 }
 
 bool OImageScrollView::FirstResizeDone()const
 {
     return m_states.testBit(FIRST_RESIZE_DONE);
 }
 
 void OImageScrollView::setFirstResizeDone(bool how)
 {
     m_states.setBit(FIRST_RESIZE_DONE,how);
 }
 
 bool OImageScrollView::ImageIsJpeg()const
 {
     return m_states.testBit(IMAGE_IS_JPEG);
 }
 
 void OImageScrollView::setImageIsJpeg(bool how)
 {
     m_states.setBit(IMAGE_IS_JPEG,how);
 }
 
 bool OImageScrollView::ImageScaledLoaded()const
 {
     return m_states.testBit(IMAGE_SCALED_LOADED);
 }
 
 void OImageScrollView::setImageScaledLoaded(bool how)
 {
     m_states.setBit(IMAGE_SCALED_LOADED,how);
 }
 
 } // namespace MM
 } // namespace Opie
diff --git a/libopie2/opiemm/opieexif.cpp b/libopie2/opiemm/opieexif.cpp
new file mode 100644
index 0000000..0860ea8
--- a/dev/null
+++ b/libopie2/opiemm/opieexif.cpp
@@ -0,0 +1,1195 @@
+#include "opieexif.h"
+
+/* OPIE */
+#include <opie2/odebug.h>
+#include <qpe/timestring.h>
+/* QT */
+#include <qobject.h>
+#include <qimage.h>
+
+/**
+    exif.h
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <time.h>
+
+#include <qstring.h>
+#include <qfile.h>
+#include <qimage.h>
+
+//static int HaveAll;
+
+//--------------------------------------------------------------------------
+// Table of Jpeg encoding process names
+
+#define M_SOF0  0xC0            // Start Of Frame N
+#define M_SOF1  0xC1            // N indicates which compression process
+#define M_SOF2  0xC2            // Only SOF0-SOF2 are now in common use
+#define M_SOF3  0xC3
+#define M_SOF5  0xC5            // NB: codes C4 and CC are NOT SOF markers
+#define M_SOF6  0xC6
+#define M_SOF7  0xC7
+#define M_SOF9  0xC9
+#define M_SOF10 0xCA
+#define M_SOF11 0xCB
+#define M_SOF13 0xCD
+#define M_SOF14 0xCE
+#define M_SOF15 0xCF
+#define M_SOI   0xD8            // Start Of Image (beginning of datastream)
+#define M_EOI   0xD9            // End Of Image (end of datastream)
+#define M_SOS   0xDA            // Start Of Scan (begins compressed data)
+#define M_JFIF  0xE0            // Jfif marker
+#define M_EXIF  0xE1            // Exif marker
+#define M_COM   0xFE            // COMment
+
+
+//--------------------------------------------------------------------------
+// Describes format descriptor
+static int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
+#define NUM_FORMATS 12
+
+#define FMT_BYTE       1
+#define FMT_STRING     2
+#define FMT_USHORT     3
+#define FMT_ULONG      4
+#define FMT_URATIONAL  5
+#define FMT_SBYTE      6
+#define FMT_UNDEFINED  7
+#define FMT_SSHORT     8
+#define FMT_SLONG      9
+#define FMT_SRATIONAL 10
+#define FMT_SINGLE    11
+#define FMT_DOUBLE    12
+
+//--------------------------------------------------------------------------
+// Describes tag values
+
+#define TAG_EXIF_OFFSET       0x8769
+#define TAG_INTEROP_OFFSET    0xa005
+
+#define TAG_MAKE              0x010F
+#define TAG_MODEL             0x0110
+#define TAG_ORIENTATION       0x0112
+
+#define TAG_EXPOSURETIME      0x829A
+#define TAG_FNUMBER           0x829D
+
+#define TAG_SHUTTERSPEED      0x9201
+#define TAG_APERTURE          0x9202
+#define TAG_MAXAPERTURE       0x9205
+#define TAG_FOCALLENGTH       0x920A
+
+#define TAG_DATETIME_ORIGINAL 0x9003
+#define TAG_USERCOMMENT       0x9286
+
+#define TAG_SUBJECT_DISTANCE  0x9206
+#define TAG_FLASH             0x9209
+
+#define TAG_FOCALPLANEXRES    0xa20E
+#define TAG_FOCALPLANEUNITS   0xa210
+#define TAG_EXIF_IMAGEWIDTH   0xA002
+#define TAG_EXIF_IMAGELENGTH  0xA003
+
+// the following is added 05-jan-2001 vcs
+#define TAG_EXPOSURE_BIAS     0x9204
+#define TAG_WHITEBALANCE      0x9208
+#define TAG_METERING_MODE     0x9207
+#define TAG_EXPOSURE_PROGRAM  0x8822
+#define TAG_ISO_EQUIVALENT    0x8827
+#define TAG_COMPRESSION_LEVEL 0x9102
+
+#define TAG_THUMBNAIL_OFFSET  0x0201
+#define TAG_THUMBNAIL_LENGTH  0x0202
+
+
+
+namespace Opie {
+
+namespace MM {
+
+class FatalError {
+    const char* ex;
+public:
+    FatalError(const char* s) { ex = s; }
+    void debug_print() const { owarn << "exception: " << ex << "" << oendl;  }
+};
+
+ExifData::TagTable_t ProcessTable[] = {
+    { M_SOF0,   "Baseline"},
+    { M_SOF1,   "Extended sequential"},
+    { M_SOF2,   "Progressive"},
+    { M_SOF3,   "Lossless"},
+    { M_SOF5,   "Differential sequential"},
+    { M_SOF6,   "Differential progressive"},
+    { M_SOF7,   "Differential lossless"},
+    { M_SOF9,   "Extended sequential, arithmetic coding"},
+    { M_SOF10,  "Progressive, arithmetic coding"},
+    { M_SOF11,  "Lossless, arithmetic coding"},
+    { M_SOF13,  "Differential sequential, arithmetic coding"},
+    { M_SOF14,  "Differential progressive, arithmetic coding"},
+    { M_SOF15,  "Differential lossless, arithmetic coding"},
+    { 0,        "Unknown"}
+};
+
+//--------------------------------------------------------------------------
+// Parse the marker stream until SOS or EOI is seen;
+//--------------------------------------------------------------------------
+int ExifData::ReadJpegSections (QFile & infile, ReadMode_t ReadMode)
+{
+    int a;
+
+    a = infile.getch();
+
+    if (a != 0xff || infile.getch() != M_SOI) {
+        SectionsRead = 0;
+        return false;
+    }
+    for(SectionsRead = 0; SectionsRead < MAX_SECTIONS-1; ){
+        int marker = 0;
+        int got;
+        unsigned int ll,lh;
+        unsigned int itemlen;
+        uchar * Data;
+
+        for (a=0;a<7;a++){
+            marker = infile.getch();
+            if (marker != 0xff) break;
+
+            if (a >= 6){
+
+                owarn << "too many padding bytes" << oendl;
+                return false;
+
+            }
+        }
+
+        if (marker == 0xff){
+            // 0xff is legal padding, but if we get that many, something's wrong.
+            return false;
+        }
+
+        Sections[SectionsRead].Type = marker;
+
+        // Read the length of the section.
+        lh = (uchar) infile.getch();
+        ll = (uchar) infile.getch();
+
+        itemlen = (lh << 8) | ll;
+
+        if (itemlen < 2) {
+            return false;;
+        }
+
+        Sections[SectionsRead].Size = itemlen;
+
+        Data = (uchar *)malloc(itemlen+1); // Add 1 to allow sticking a 0 at the end.
+        Sections[SectionsRead].Data = Data;
+
+        // Store first two pre-read bytes.
+        Data[0] = (uchar)lh;
+        Data[1] = (uchar)ll;
+
+        got = infile.readBlock((char*)Data+2, itemlen-2); // Read the whole section.
+        if (( unsigned ) got != itemlen-2){
+            return false;
+        }
+        SectionsRead++;
+
+        switch(marker){
+
+            case M_SOS:   // stop before hitting compressed data
+                // If reading entire image is requested, read the rest of the data.
+                if (ReadMode & READ_IMAGE){
+                    unsigned long size;
+
+                    size = QMAX( 0ul, infile.size()-infile.at() );
+                    Data = (uchar *)malloc(size);
+                    if (Data == NULL){
+                        return false;
+                    }
+
+                    got = infile.readBlock((char*)Data,  size);
+                    if (( unsigned ) got != size){
+                        return false;
+                    }
+
+                    Sections[SectionsRead].Data = Data;
+                    Sections[SectionsRead].Size = size;
+                    Sections[SectionsRead].Type = PSEUDO_IMAGE_MARKER;
+                    SectionsRead ++;
+                    //HaveAll = 1;
+                }
+                return true;
+
+            case M_EOI:   // in case it's a tables-only JPEG stream
+                owarn << "No image in jpeg!" << oendl;
+                return false;
+
+            case M_COM: // Comment section
+        // pieczy 2002-02-12
+        // now the User comment goes to UserComment
+        // so we can store a Comment section also in READ_EXIF mode
+        process_COM(Data, itemlen);
+                break;
+
+            case M_JFIF:
+                // Regular jpegs always have this tag, exif images have the exif
+                // marker instead, althogh ACDsee will write images with both markers.
+                // this program will re-create this marker on absence of exif marker.
+                // hence no need to keep the copy from the file.
+                free(Sections[--SectionsRead].Data);
+                break;
+
+            case M_EXIF:
+                // Seen files from some 'U-lead' software with Vivitar scanner
+                // that uses marker 31 for non exif stuff.  Thus make sure
+                // it says 'Exif' in the section before treating it as exif.
+                if ((ReadMode & READ_EXIF) && memcmp(Data+2, "Exif", 4) == 0){
+                    process_EXIF((uchar *)Data, itemlen);
+                }else{
+                    // Discard this section.
+                    free(Sections[--SectionsRead].Data);
+                }
+                break;
+
+            case M_SOF0:
+            case M_SOF1:
+            case M_SOF2:
+            case M_SOF3:
+            case M_SOF5:
+            case M_SOF6:
+            case M_SOF7:
+            case M_SOF9:
+            case M_SOF10:
+            case M_SOF11:
+            case M_SOF13:
+            case M_SOF14:
+            case M_SOF15:
+                process_SOFn(Data, marker);
+            default:
+                break;
+                break;
+        }
+    }
+    return true;
+}
+
+
+//--------------------------------------------------------------------------
+// Discard read data.
+//--------------------------------------------------------------------------
+void ExifData::DiscardData(void)
+{
+    for (int a=0; a < SectionsRead; a++)
+        free(Sections[a].Data);
+    SectionsRead = 0;
+}
+
+//--------------------------------------------------------------------------
+// Convert a 16 bit unsigned value from file's native byte order
+//--------------------------------------------------------------------------
+int ExifData::Get16u(void * Short)
+{
+    if (MotorolaOrder){
+        return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
+    }else{
+        return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
+    }
+}
+
+//--------------------------------------------------------------------------
+// Convert a 32 bit signed value from file's native byte order
+//--------------------------------------------------------------------------
+int ExifData::Get32s(void * Long)
+{
+    if (MotorolaOrder){
+        return  ((( char *)Long)[0] << 24) | (((uchar *)Long)[1] << 16)
+              | (((uchar *)Long)[2] << 8 ) | (((uchar *)Long)[3] << 0 );
+    }else{
+        return  ((( char *)Long)[3] << 24) | (((uchar *)Long)[2] << 16)
+              | (((uchar *)Long)[1] << 8 ) | (((uchar *)Long)[0] << 0 );
+    }
+}
+
+//--------------------------------------------------------------------------
+// Convert a 32 bit unsigned value from file's native byte order
+//--------------------------------------------------------------------------
+unsigned ExifData::Get32u(void * Long)
+{
+    return (unsigned)Get32s(Long) & 0xffffffff;
+}
+
+//--------------------------------------------------------------------------
+// Evaluate number, be it int, rational, or float from directory.
+//--------------------------------------------------------------------------
+double ExifData::ConvertAnyFormat(void * ValuePtr, int Format)
+{
+    double Value;
+    Value = 0;
+
+    switch(Format){
+        case FMT_SBYTE:     Value = *(signed char *)ValuePtr;  break;
+        case FMT_BYTE:      Value = *(uchar *)ValuePtr;        break;
+
+        case FMT_USHORT:    Value = Get16u(ValuePtr);          break;
+
+        case FMT_ULONG:     Value = Get32u(ValuePtr);          break;
+
+        case FMT_URATIONAL:
+        case FMT_SRATIONAL:
+            {
+                int Num,Den;
+                Num = Get32s(ValuePtr);
+                Den = Get32s(4+(char *)ValuePtr);
+                if (Den == 0){
+                    Value = 0;
+                }else{
+                    Value = (double)Num/Den;
+                }
+                break;
+            }
+
+        case FMT_SSHORT:    Value = (signed short)Get16u(ValuePtr);  break;
+        case FMT_SLONG:     Value = Get32s(ValuePtr);                break;
+
+        // Not sure if this is correct (never seen float used in Exif format)
+        case FMT_SINGLE:    Value = (double)*(float *)ValuePtr;      break;
+        case FMT_DOUBLE:    Value = *(double *)ValuePtr;             break;
+    }
+    return Value;
+}
+
+//--------------------------------------------------------------------------
+// Process one of the nested EXIF directories.
+//--------------------------------------------------------------------------
+void ExifData::ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase, unsigned ExifLength)
+{
+    int de;
+    int a;
+    int NumDirEntries;
+    unsigned ThumbnailOffset = 0;
+    unsigned ThumbnailSize = 0;
+
+    NumDirEntries = Get16u(DirStart);
+    #define DIR_ENTRY_ADDR(Start, Entry) (Start+2+12*(Entry))
+
+    {
+        unsigned char * DirEnd;
+        DirEnd = DIR_ENTRY_ADDR(DirStart, NumDirEntries);
+        if (DirEnd+4 > (OffsetBase+ExifLength)){
+            if (DirEnd+2 == OffsetBase+ExifLength || DirEnd == OffsetBase+ExifLength){
+                // Version 1.3 of jhead would truncate a bit too much.
+                // This also caught later on as well.
+            }else{
+                // Note: Files that had thumbnails trimmed with jhead 1.3 or earlier
+                // might trigger this.
+                return;
+            }
+        }
+        if (DirEnd < LastExifRefd) LastExifRefd = DirEnd;
+    }
+
+    for (de=0;de<NumDirEntries;de++){
+        int Tag, Format, Components;
+        unsigned char * ValuePtr;
+        int ByteCount;
+        char * DirEntry;
+        DirEntry = (char *)DIR_ENTRY_ADDR(DirStart, de);
+
+        Tag = Get16u(DirEntry);
+        Format = Get16u(DirEntry+2);
+        Components = Get32u(DirEntry+4);
+
+        if ((Format-1) >= NUM_FORMATS) {
+            // (-1) catches illegal zero case as unsigned underflows to positive large.
+            return;
+        }
+
+        ByteCount = Components * BytesPerFormat[Format];
+
+        if (ByteCount > 4){
+            unsigned OffsetVal;
+            OffsetVal = Get32u(DirEntry+8);
+            // If its bigger than 4 bytes, the dir entry contains an offset.
+            if (OffsetVal+ByteCount > ExifLength){
+                // Bogus pointer offset and / or bytecount value
+                //printf("Offset %d bytes %d ExifLen %d\n",OffsetVal, ByteCount, ExifLength);
+
+                return;
+            }
+            ValuePtr = OffsetBase+OffsetVal;
+        }else{
+            // 4 bytes or less and value is in the dir entry itself
+            ValuePtr = (unsigned char *)DirEntry+8;
+        }
+
+        if (LastExifRefd < ValuePtr+ByteCount){
+            // Keep track of last byte in the exif header that was actually referenced.
+            // That way, we know where the discardable thumbnail data begins.
+            LastExifRefd = ValuePtr+ByteCount;
+        }
+
+        // Extract useful components of tag
+        switch(Tag){
+
+            case TAG_MAKE:
+                ExifData::CameraMake = QString((char*)ValuePtr);
+                break;
+
+            case TAG_MODEL:
+                ExifData::CameraModel = QString((char*)ValuePtr);
+        break;
+
+            case TAG_ORIENTATION:
+                Orientation = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_DATETIME_ORIGINAL:
+        DateTime = QString((char*)ValuePtr);
+                break;
+
+            case TAG_USERCOMMENT:
+                // Olympus has this padded with trailing spaces.  Remove these first.
+                for (a=ByteCount;;){
+                    a--;
+                    if ((ValuePtr)[a] == ' '){
+                        (ValuePtr)[a] = '\0';
+                    }else{
+                        break;
+                    }
+                    if (a == 0) break;
+                }
+
+                // Copy the comment
+                if (memcmp(ValuePtr, "ASCII",5) == 0){
+                    for (a=5;a<10;a++){
+                        int c;
+                        c = (ValuePtr)[a];
+                        if (c != '\0' && c != ' '){
+                            //strncpy(ImageInfo.Comments, (const char*)(a+ValuePtr), 199);
+                            UserComment.sprintf("%s", (const char*)(a+ValuePtr));
+                            break;
+                        }
+                    }
+                }else{
+                    //strncpy(ImageInfo.Comments, (const char*)ValuePtr, 199);
+                    UserComment.sprintf("%s", (const char*)ValuePtr);
+                }
+                break;
+
+            case TAG_FNUMBER:
+                // Simplest way of expressing aperture, so I trust it the most.
+                // (overwrite previously computd value if there is one)
+        ExifData::ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_APERTURE:
+            case TAG_MAXAPERTURE:
+                // More relevant info always comes earlier, so only use this field if we don't
+                // have appropriate aperture information yet.
+                if (ExifData::ApertureFNumber == 0){
+                    ExifData::ApertureFNumber
+                        = (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2)*0.5);
+                }
+                break;
+
+            case TAG_FOCALLENGTH:
+                // Nice digital cameras actually save the focal length as a function
+                // of how farthey are zoomed in.
+                ExifData::FocalLength = (float)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_SUBJECT_DISTANCE:
+                // Inidcates the distacne the autofocus camera is focused to.
+                // Tends to be less accurate as distance increases.
+                ExifData::Distance = (float)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_EXPOSURETIME:
+                // Simplest way of expressing exposure time, so I trust it most.
+                // (overwrite previously computd value if there is one)
+                ExifData::ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_SHUTTERSPEED:
+                // More complicated way of expressing exposure time, so only use
+                // this value if we don't already have it from somewhere else.
+                if (ExifData::ExposureTime == 0){
+                    ExifData::ExposureTime
+                        = (float)(1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2)));
+                }
+                break;
+
+            case TAG_FLASH:
+                if (ConvertAnyFormat(ValuePtr, Format)){
+                    ExifData::FlashUsed = 1;
+                }
+                break;
+
+            case TAG_EXIF_IMAGELENGTH:
+                ExifImageLength = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_EXIF_IMAGEWIDTH:
+                ExifImageWidth = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_FOCALPLANEXRES:
+                FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_FOCALPLANEUNITS:
+                switch((int)ConvertAnyFormat(ValuePtr, Format)){
+                    case 1: FocalplaneUnits = 25.4; break; // inch
+                    case 2:
+                        // According to the information I was using, 2 means meters.
+                        // But looking at the Cannon powershot's files, inches is the only
+                        // sensible value.
+                        FocalplaneUnits = 25.4;
+                        break;
+
+                    case 3: FocalplaneUnits = 10;   break;  // centimeter
+                    case 4: FocalplaneUnits = 1;    break;  // milimeter
+                    case 5: FocalplaneUnits = .001; break;  // micrometer
+                }
+                break;
+
+                // Remaining cases contributed by: Volker C. Schoech (schoech@gmx.de)
+
+            case TAG_EXPOSURE_BIAS:
+            ExifData::ExposureBias = (float)ConvertAnyFormat(ValuePtr, Format);
+        break;
+
+            case TAG_WHITEBALANCE:
+                 ExifData::Whitebalance = (int)ConvertAnyFormat(ValuePtr, Format);
+         break;
+
+            case TAG_METERING_MODE:
+                ExifData::MeteringMode = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_EXPOSURE_PROGRAM:
+                ExifData::ExposureProgram = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_ISO_EQUIVALENT:
+                ExifData::ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
+                if ( ExifData::ISOequivalent < 50 ) ExifData::ISOequivalent *= 200;
+                break;
+
+            case TAG_COMPRESSION_LEVEL:
+                ExifData::CompressionLevel = (int)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_THUMBNAIL_OFFSET:
+                ThumbnailOffset = (unsigned)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+            case TAG_THUMBNAIL_LENGTH:
+                ThumbnailSize = (unsigned)ConvertAnyFormat(ValuePtr, Format);
+                break;
+
+        }
+
+        if (Tag == TAG_EXIF_OFFSET || Tag == TAG_INTEROP_OFFSET){
+            unsigned char * SubdirStart;
+            SubdirStart = OffsetBase + Get32u(ValuePtr);
+            if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength){
+                return;
+            }
+            ProcessExifDir(SubdirStart, OffsetBase, ExifLength);
+            continue;
+        }
+    }
+
+    {
+        // In addition to linking to subdirectories via exif tags,
+        // there's also a potential link to another directory at the end of each
+        // directory.  this has got to be the result of a comitee!
+        unsigned char * SubdirStart;
+        unsigned Offset;
+
+        if (DIR_ENTRY_ADDR(DirStart, NumDirEntries) + 4 <= OffsetBase+ExifLength){
+            Offset = Get32u(DIR_ENTRY_ADDR(DirStart, NumDirEntries));
+        // There is at least one jpeg from an HP camera having an Offset of almost MAXUINT.
+        // Adding OffsetBase to it produces an overflow, so compare with ExifLength here.
+        // See http://bugs.kde.org/show_bug.cgi?id=54542
+        if (Offset && Offset < ExifLength){
+                SubdirStart = OffsetBase + Offset;
+                if (SubdirStart > OffsetBase+ExifLength){
+                    if (SubdirStart < OffsetBase+ExifLength+20){
+                        // Jhead 1.3 or earlier would crop the whole directory!
+                        // As Jhead produces this form of format incorrectness,
+                        // I'll just let it pass silently
+                        owarn << "Thumbnail removed with Jhead 1.3 or earlier" << oendl;
+                    }else{
+                        return;
+                    }
+                }else{
+                    if (SubdirStart <= OffsetBase+ExifLength){
+                        ProcessExifDir(SubdirStart, OffsetBase, ExifLength);
+                    }
+                }
+            }
+        }else{
+            // The exif header ends before the last next directory pointer.
+        }
+    }
+
+    if (ThumbnailSize && ThumbnailOffset){
+        if (ThumbnailSize + ThumbnailOffset <= ExifLength){
+            // The thumbnail pointer appears to be valid.  Store it.
+        Thumbnail.loadFromData(OffsetBase + ThumbnailOffset, ThumbnailSize, "JPEG");
+        }
+    }
+}
+
+//--------------------------------------------------------------------------
+// Process a COM marker.  We want to leave the bytes unchanged.  The
+// progam that displays this text may decide to remove blanks, convert
+// newlines, or otherwise modify the text.  In particular we want to be
+// safe for passing utf-8 text.
+//--------------------------------------------------------------------------
+void ExifData::process_COM (const uchar * Data, int length)
+{
+    QChar ch;
+    int a;
+
+    for (a=2;a<length;a++){
+        ch = Data[a];
+        if (ch == '\000') continue;                     // Remove nulls
+        Comment.append(ch);
+    }
+}
+
+
+//--------------------------------------------------------------------------
+// Process a SOFn marker.  This is useful for the image dimensions
+//--------------------------------------------------------------------------
+void ExifData::process_SOFn (const uchar * Data, int marker)
+{
+    int data_precision, num_components;
+
+    data_precision = Data[2];
+    ExifData::Height = Get16m(Data+3);
+    ExifData::Width = Get16m(Data+5);
+    num_components = Data[7];
+
+    if (num_components == 3){
+        ExifData::IsColor = 1;
+    }else{
+        ExifData::IsColor = 0;
+    }
+
+    ExifData::Process = marker;
+
+}
+
+//--------------------------------------------------------------------------
+// Get 16 bits motorola order (always) for jpeg header stuff.
+//--------------------------------------------------------------------------
+int ExifData::Get16m(const void * Short)
+{
+    return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
+}
+
+
+//--------------------------------------------------------------------------
+// Process a EXIF marker
+// Describes all the drivel that most digital cameras include...
+//--------------------------------------------------------------------------
+void ExifData::process_EXIF(unsigned char * CharBuf, unsigned int length)
+{
+    ExifData::FlashUsed = 0; // If it s from a digicam, and it used flash, it says so.
+
+    FocalplaneXRes = 0;
+    FocalplaneUnits = 0;
+    ExifImageWidth = 0;
+    ExifImageLength = 0;
+
+    {   // Check the EXIF header component
+        static const uchar ExifHeader[] = "Exif\0\0";
+        if (memcmp(CharBuf+2, ExifHeader,6)){
+            return;
+        }
+    }
+
+    if (memcmp(CharBuf+8,"II",2) == 0){
+        // printf("Exif section in Intel order\n");
+        MotorolaOrder = 0;
+    }else{
+        if (memcmp(CharBuf+8,"MM",2) == 0){
+            // printf("Exif section in Motorola order\n");
+            MotorolaOrder = 1;
+        }else{
+            return;
+        }
+    }
+
+    // Check the next two values for correctness.
+    if (Get16u(CharBuf+10) != 0x2a
+      || Get32u(CharBuf+12) != 0x08){
+        return;
+    }
+
+    LastExifRefd = CharBuf;
+
+    // First directory starts 16 bytes in.  Offsets start at 8 bytes in.
+    ProcessExifDir(CharBuf+16, CharBuf+8, length-6);
+
+    // This is how far the interesting (non thumbnail) part of the exif went.
+    ExifSettingsLength = LastExifRefd - CharBuf;
+
+    // Compute the CCD width, in milimeters.
+    if (FocalplaneXRes != 0){
+        ExifData::CCDWidth = (float)(ExifImageWidth * FocalplaneUnits / FocalplaneXRes);
+    }
+}
+
+//--------------------------------------------------------------------------
+// Convert exif time to Unix time structure
+//--------------------------------------------------------------------------
+int ExifData::Exif2tm(struct ::tm * timeptr, char * ExifTime)
+{
+    int a;
+
+    timeptr->tm_wday = -1;
+
+    // Check for format: YYYY:MM:DD HH:MM:SS format.
+    a = sscanf(ExifTime, "%d:%d:%d %d:%d:%d",
+            &timeptr->tm_year, &timeptr->tm_mon, &timeptr->tm_mday,
+            &timeptr->tm_hour, &timeptr->tm_min, &timeptr->tm_sec);
+
+    if (a == 6){
+        timeptr->tm_isdst = -1;
+        timeptr->tm_mon -= 1;      // Adjust for unix zero-based months
+        timeptr->tm_year -= 1900;  // Adjust for year starting at 1900
+        return true; // worked.
+    }
+
+    return false; // Wasn't in Exif date format.
+}
+
+//--------------------------------------------------------------------------
+// Contructor for initialising
+//--------------------------------------------------------------------------
+ExifData::ExifData()
+{
+    ExifData::Whitebalance = -1;
+    ExifData::MeteringMode = -1;
+    ExifData::FlashUsed = -1;
+    Orientation = 0;
+    Height = 0;
+    Width = 0;
+    IsColor = 0;
+    Process = 0;
+    FocalLength = 0;
+    ExposureTime = 0;
+    ApertureFNumber = 0;
+    Distance = 0;
+    CCDWidth = 0;
+    ExposureBias = 0;
+    ExposureProgram = 0;
+    ISOequivalent = 0;
+    CompressionLevel = 0;
+    MotorolaOrder = 0;
+}
+
+ExifData::~ExifData()
+{
+}
+
+//--------------------------------------------------------------------------
+// process a EXIF jpeg file
+//--------------------------------------------------------------------------
+bool ExifData::scan(const QString & path)
+{
+    int ret;
+
+    QFile f(path);
+    f.open(IO_ReadOnly);
+
+    // Scan the JPEG headers.
+    ret = ReadJpegSections(f, READ_EXIF);
+
+    if (ret == false){
+        owarn << "Not JPEG file!" << oendl;
+        DiscardData();
+        f.close();
+        return false;
+    }
+    f.close();
+    DiscardData();
+
+    //now make the strings clean,
+    // for exmaple my Casio is a "QV-4000   "
+    CameraMake = CameraMake.stripWhiteSpace();
+    CameraModel = CameraModel.stripWhiteSpace();
+    UserComment = UserComment.stripWhiteSpace();
+    Comment = Comment.stripWhiteSpace();
+    return true;
+}
+
+//--------------------------------------------------------------------------
+// Does the embedded thumbnail match the jpeg image?
+//--------------------------------------------------------------------------
+#ifndef JPEG_TOL
+#define JPEG_TOL 0.02
+#endif
+bool ExifData::isThumbnailSane() {
+  if (Thumbnail.isNull()) return false;
+
+  // check whether thumbnail dimensions match the image
+  // not foolproof, but catches some altered images (jpegtran -rotate)
+  if (ExifImageLength != 0 && ExifImageLength != Height) return false;
+  if (ExifImageWidth != 0 && ExifImageWidth != Width) return false;
+  if (Thumbnail.width() == 0 || Thumbnail.height() == 0) return false;
+  if (Height == 0 || Width == 0) return false;
+  double d = (double)Height/Width*Thumbnail.width()/Thumbnail.height();
+  return (1-JPEG_TOL < d) && (d < 1+JPEG_TOL);
+}
+
+
+
+static QImage flip_image( const QImage& img );
+static QImage rotate_90( const QImage& img );
+static QImage rotate_180( const QImage& );
+static QImage rotate_270( const QImage& );
+
+//--------------------------------------------------------------------------
+// return a thumbnail that respects the orientation flag
+// only if it seems sane
+//--------------------------------------------------------------------------
+QImage ExifData::getThumbnail() {
+  if (!isThumbnailSane()) return NULL;
+  if (!Orientation || Orientation == 1) return Thumbnail;
+
+  // now fix orientation
+
+  QImage dest = Thumbnail;
+  switch (Orientation) {  // notice intentional fallthroughs
+    case 2: dest = flip_image( dest ); break;
+    case 4: dest = flip_image( dest );
+    case 3: dest =rotate_180( dest ); break;
+    case 5: dest = flip_image( dest );
+    case 6: dest = rotate_90( dest ); break;
+    case 7: dest = flip_image( dest );
+    case 8: dest = rotate_270( dest ); break;
+    default: break; // should never happen
+  }
+  return dest;
+}
+
+
+/*
+ *
+ */
+static QImage flip_image( const QImage& img ) {
+    return img.mirror( TRUE, FALSE );
+}
+
+
+static QImage dest;
+static int x, y;
+static unsigned int  *srcData, *destData; // we're not threaded anyway
+static unsigned char *srcData8, *destData8; // 8 bit is char
+static unsigned int *srcTable,  *destTable; // destination table
+
+
+static QImage rotate_90_8( const QImage &img ) {
+    dest.create(img.height(), img.width(), img.depth());
+    dest.setNumColors(img.numColors());
+    srcTable = (unsigned int *)img.colorTable();
+    destTable = (unsigned int *)dest.colorTable();
+    for ( x=0; x < img.numColors(); ++x )
+        destTable[x] = srcTable[x];
+    for ( y=0; y < img.height(); ++y ){
+        srcData8 = (unsigned char *)img.scanLine(y);
+        for ( x=0; x < img.width(); ++x ){
+            destData8 = (unsigned char *)dest.scanLine(x);
+            destData8[img.height()-y-1] = srcData8[x];
+        }
+    }
+    return dest;
+}
+
+static QImage rotate_90_all(  const QImage& img ) {
+    dest.create(img.height(), img.width(), img.depth());
+    for ( y=0; y < img.height(); ++y )    {
+        srcData = (unsigned int *)img.scanLine(y);
+        for ( x=0; x < img.width(); ++x ) {
+            destData = (unsigned int *)dest.scanLine(x);
+            destData[img.height()-y-1] = srcData[x];
+        }
+    }
+
+    return dest;
+}
+
+
+static QImage  rotate_90( const QImage & img ) {
+    if ( img.depth() > 8)
+        return rotate_90_all( img );
+    else
+        return rotate_90_8( img );
+}
+
+static QImage rotate_180_all( const QImage& img ) {
+    dest.create(img.width(), img.height(), img.depth());
+    for ( y=0; y < img.height(); ++y ){
+        srcData = (unsigned int *)img.scanLine(y);
+        destData = (unsigned int *)dest.scanLine(img.height()-y-1);
+        for ( x=0; x < img.width(); ++x )
+            destData[img.width()-x-1] = srcData[x];
+    }
+    return dest;
+}
+
+static QImage rotate_180_8( const QImage& img ) {
+    dest.create(img.width(), img.height(), img.depth());
+    dest.setNumColors(img.numColors());
+    srcTable = (unsigned int *)img.colorTable();
+    destTable = (unsigned int *)dest.colorTable();
+    for ( x=0; x < img.numColors(); ++x )
+        destTable[x] = srcTable[x];
+    for ( y=0; y < img.height(); ++y ){
+        srcData8 = (unsigned char *)img.scanLine(y);
+        destData8 = (unsigned char *)dest.scanLine(img.height()-y-1);
+        for ( x=0; x < img.width(); ++x )
+            destData8[img.width()-x-1] = srcData8[x];
+    }
+    return dest;
+}
+
+static QImage rotate_180( const QImage& img ) {
+    if ( img.depth() > 8 )
+        return rotate_180_all( img );
+    else
+        return rotate_180_8( img );
+}
+
+
+static QImage rotate_270_8( const QImage& img ) {
+    dest.create(img.height(), img.width(), img.depth());
+    dest.setNumColors(img.numColors());
+    srcTable = (unsigned int *)img.colorTable();
+    destTable = (unsigned int *)dest.colorTable();
+    for ( x=0; x < img.numColors(); ++x )
+        destTable[x] = srcTable[x];
+    for ( y=0; y < img.height(); ++y ){
+        srcData8 = (unsigned char *)img.scanLine(y);
+        for ( x=0; x < img.width(); ++x ){
+            destData8 = (unsigned char *)dest.scanLine(img.width()-x-1);
+            destData8[y] = srcData8[x];
+        }
+    }
+
+    return dest;
+}
+
+static QImage rotate_270_all( const QImage& img ) {
+    dest.create(img.height(), img.width(), img.depth());
+    for ( y=0; y < img.height(); ++y ){
+        srcData = (unsigned int *)img.scanLine(y);
+        for ( x=0; x < img.width(); ++x ){
+            destData = (unsigned int *)dest.scanLine(img.width()-x-1);
+            destData[y] = srcData[x];
+        }
+    }
+    return dest;
+}
+
+static QImage rotate_270( const QImage& img ) {
+    if (  img.depth() > 8 )
+        return rotate_270_all( img );
+    else
+        return rotate_270_8( img );
+}
+
+
+static QString color_mode_to_string( bool b ) {
+    return b ? QObject::tr( "Colormode: Color\n" ) : QObject::tr( "Colormode: Black and white\n" );
+}
+
+static QString compression_to_string( int level ) {
+    QString str;
+    switch( level ) {
+    case 1:
+        str = QObject::tr( "Basic" );
+        break;
+    case 2:
+        str = QObject::tr( "Normal" );
+        break;
+    case 4:
+        str = QObject::tr( "Fine" );
+        break;
+    default:
+        str = QObject::tr( "Unknown" );
+
+    }
+    return QObject::tr("Quality: %1\n").arg(str);
+}
+
+
+static QDateTime parseDateTime( const QString& string )
+{
+    QDateTime dt;
+    if ( string.length() != 19 )
+        return dt;
+
+    QString year    = string.left( 4 );
+    QString month   = string.mid( 5, 2 );
+    QString day     = string.mid( 8, 2 );
+    QString hour    = string.mid( 11, 2 );
+    QString minute  = string.mid( 14, 2 );
+    QString seconds = string.mid( 18, 2 );
+
+    bool ok;
+    bool allOk = true;
+    int y  = year.toInt( &ok );
+    allOk &= ok;
+
+    int mo = month.toInt( &ok );
+    allOk &= ok;
+
+    int d  = day.toInt( &ok );
+    allOk &= ok;
+
+    int h  = hour.toInt( &ok );
+    allOk &= ok;
+
+    int mi = minute.toInt( &ok );
+    allOk &= ok;
+
+    int s  = seconds.toInt( &ok );
+    allOk &= ok;
+
+    if ( allOk ) {
+        dt.setDate( QDate( y, mo, d ) );
+        dt.setTime( QTime( h, mi, s ) );
+    }
+
+    return dt;
+}
+
+static QString white_balance_string( int i ) {
+    QString balance;
+    switch ( i ) {
+    case 0:
+        balance = QObject::tr( "Unknown" );
+        break;
+    case 1:
+        balance = QObject::tr( "Daylight" );
+        break;
+    case 2:
+        balance = QObject::tr( "Fluorescent" );
+        break;
+    case 3:
+        balance = QObject::tr( "Tungsten" );
+        break;
+    case 17:
+        balance = QObject::tr( "Standard light A" );
+        break;
+    case 18:
+        balance = QObject::tr( "Standard light B" );
+        break;
+    case 19:
+        balance = QObject::tr( "Standard light C" );
+        break;
+    case 20:
+        balance = QObject::tr( "D55" );
+        break;
+    case 21:
+        balance = QObject::tr( "D65" );
+        break;
+    case 22:
+        balance = QObject::tr( "D75" );
+        break;
+    case 255:
+        balance = QObject::tr( "Other" );
+        break;
+    default:
+        balance = QObject::tr( "Unknown" );
+    }
+    return QObject::tr( "White Balance: %1\n" ).arg( balance );
+
+}
+
+
+static QString metering_mode( int i) {
+    QString meter;
+    switch( i ) {
+    case 0:
+        meter = QObject::tr( "Unknown" );
+        break;
+    case 1:
+        meter = QObject::tr( "Average" );
+        break;
+    case 2:
+        meter = QObject::tr( "Center weighted average" );
+        break;
+    case 3:
+        meter = QObject::tr( "Spot" );
+        break;
+    case 4:
+        meter = QObject::tr( "MultiSpot" );
+        break;
+    case 5:
+        meter = QObject::tr( "Pattern" );
+        break;
+    case 6:
+        meter = QObject::tr( "Partial" );
+        break;
+    case 255:
+        meter = QObject::tr( "Other" );
+        break;
+    default:
+        meter = QObject::tr( "Unknown" );
+    }
+
+    return QObject::tr( "Metering Mode: %1\n" ).arg( meter );
+}
+
+
+static QString exposure_program( int i ) {
+    QString exp;
+    switch( i ) {
+    case 0:
+        exp = QObject::tr( "Not defined" );
+        break;
+    case 1:
+        exp = QObject::tr( "Manual" );
+        break;
+    case 2:
+        exp = QObject::tr( "Normal progam" );
+        break;
+    case 3:
+        exp = QObject::tr( "Aperture priority" );
+        break;
+    case 4:
+        exp = QObject::tr( "Shutter priority" );
+        break;
+    case 5:
+        exp = QObject::tr( "Creative progam\n(biased toward fast shutter speed" );
+        break;
+    case 6:
+        exp = QObject::tr( "Action progam\n(biased toward fast shutter speed)" );
+        break;
+    case 7:
+        exp = QObject::tr( "Portrait mode\n(for closeup photos with the background out of focus)" );
+        break;
+    case 8:
+        exp = QObject::tr( "Landscape mode\n(for landscape photos with the background in focus)" );
+        break;
+    default:
+        exp = QObject::tr( "Unknown" );
+    }
+
+    return QObject::tr( "Exposure Program: %1\n" ).arg( exp );
+}
+
+} // namespace MM
+} // namespace OPIE
diff --git a/libopie2/opiemm/opieexif.h b/libopie2/opiemm/opieexif.h
new file mode 100644
index 0000000..efaed71
--- a/dev/null
+++ b/libopie2/opiemm/opieexif.h
@@ -0,0 +1,139 @@
+#ifndef _OPIE_EXIF_H
+#define _OPIE_EXIF_H
+
+#include <qt.h>
+#include <qstring.h>
+#include <qimage.h>
+#include <qfile.h>
+
+#include <time.h>
+
+namespace Opie { namespace MM {
+
+#ifndef uchar
+typedef unsigned char uchar;
+#endif
+
+//#define MAX_SECTIONS 20
+//#define PSEUDO_IMAGE_MARKER 0x123; // Extra value.
+
+//! Class for reading exif data from images
+/*!
+ * This class is mostly used inside OImageScrollView for testing jpegs headers for a faster
+ * loading and scaling. It is taken from libexif and converted into an C++ structure.
+ *
+ * \see OImageScrollView
+ * \since 1.2
+ */
+class ExifData {
+public:
+    enum ReadMode_t {
+        READ_EXIF = 1,
+        READ_IMAGE = 2,
+        READ_ALL = 3
+    };
+
+    //--------------------------------------------------------------------------
+    // This structure is used to store jpeg file sections in memory.
+    struct Section_t {
+        uchar *  Data;
+        int      Type;
+        unsigned Size;
+    };
+
+    struct TagTable_t {
+        unsigned short Tag;
+        const char*const Desc;
+    };
+
+private:
+    static const int MAX_SECTIONS=20;
+    static const unsigned int PSEUDO_IMAGE_MARKER=0x123;
+    Section_t Sections[MAX_SECTIONS];
+
+    QString CameraMake;
+    QString CameraModel;
+    QString DateTime;
+    int   Orientation;
+    int   Height, Width;
+    int   ExifImageLength, ExifImageWidth;
+    int   IsColor;
+    int   Process;
+    int   FlashUsed;
+    float FocalLength;
+    float ExposureTime;
+    float ApertureFNumber;
+    float Distance;
+    int    Whitebalance;
+    int    MeteringMode;
+    float CCDWidth;
+    float ExposureBias;
+    int   ExposureProgram;
+    int   ISOequivalent;
+    int   CompressionLevel;
+    QString UserComment;
+    QString Comment;
+    QImage Thumbnail;
+
+    unsigned char * LastExifRefd;
+    int ExifSettingsLength;
+    double FocalplaneXRes;
+    double FocalplaneUnits;
+    int MotorolaOrder;
+    int SectionsRead;
+
+    int ReadJpegSections (QFile & infile, ReadMode_t ReadMode);
+    void DiscardData(void);
+    int Get16u(void * Short);
+    int Get32s(void * Long);
+    unsigned Get32u(void * Long);
+    double ConvertAnyFormat(void * ValuePtr, int Format);
+    void ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase, unsigned ExifLength);
+    void process_COM (const uchar * Data, int length);
+    void process_SOFn (const uchar * Data, int marker);
+    int Get16m(const void * Short);
+    void process_EXIF(unsigned char * CharBuf, unsigned int length);
+    int Exif2tm(struct ::tm * timeptr, char * ExifTime);
+
+public:
+    //! Contructor for initialising
+    ExifData();
+    //! destructor
+    virtual ~ExifData();
+    //! scan a given file
+    /*!
+     * try to scan the EXIF data of a image file
+     * \param aFile the file to scan
+     * \return true if success, otherwise false
+     */
+    bool scan(const QString &aFile);
+    QString getCameraMake() { return CameraMake; }
+    QString getCameraModel() { return CameraModel; }
+    QString getDateTime() { return DateTime; }
+    int getOrientation() { return Orientation; }
+    int getHeight() { return Height; }
+    int getWidth() { return Width; }
+    int getIsColor() { return IsColor; }
+    int getProcess() { return Process; }
+    int getFlashUsed() { return FlashUsed; }
+    float getFocalLength() { return FocalLength; }
+    float getExposureTime() { return ExposureTime; }
+    float getApertureFNumber() { return ApertureFNumber; }
+    float getDistance() { return Distance; }
+    int getWhitebalance() { return Whitebalance; }
+    int getMeteringMode() { return MeteringMode; }
+    float getCCDWidth() { return CCDWidth; }
+    float getExposureBias() { return ExposureBias; }
+    int getExposureProgram() { return ExposureProgram; }
+    int getISOequivalent() { return ISOequivalent; }
+    int getCompressionLevel() { return CompressionLevel; }
+    QString getUserComment() { return UserComment; }
+    QString getComment() { return Comment; }
+    QImage getThumbnail();
+    bool isThumbnailSane();
+    bool isNullThumbnail() { return !isThumbnailSane(); }
+};
+
+}
+}
+#endif
diff --git a/libopie2/opiemm/opiemm.pro b/libopie2/opiemm/opiemm.pro
index 09b5ed4..32580c8 100644
--- a/libopie2/opiemm/opiemm.pro
+++ b/libopie2/opiemm/opiemm.pro
@@ -1,18 +1,18 @@
 TEMPLATE    = lib
 CONFIG      += qt warn_on 
 DESTDIR     = $(OPIEDIR)/lib
-HEADERS     = osoundsystem.h oimagezoomer.h oimagescrollview.h
-SOURCES     = osoundsystem.cpp oimagezoomer.cpp oimagescrollview.cpp
+HEADERS     = osoundsystem.h oimagezoomer.h oimagescrollview.h opieexif.h
+SOURCES     = osoundsystem.cpp oimagezoomer.cpp oimagescrollview.cpp opieexif.cpp
 INTERFACES  =
 TARGET      = opiemm2
 VERSION     = 1.9.0
 INCLUDEPATH += $(OPIEDIR)/include
 DEPENDPATH  += $(OPIEDIR)/include
 
 !contains( platform, x11 ) {
   include ( $(OPIEDIR)/include.pro )
 }
 
 contains( platform, x11 ) {
   LIBS        = -L$(OPIEDIR)/lib -Wl,-rpath,$(OPIEDIR)/lib 
 }