Fixed ExifData::eraseThumbnail(). Bug #401

src/exif.cpp

@@ -736,6 +736,8 @@ namespace Exiv2 {
 
     long ExifData::eraseThumbnail()
     {
+        // First, determine if the thumbnail is at the end of the Exif data
+        bool stp = stdThumbPosition();
         // Delete all Exif.Thumbnail.* (IFD1) metadata 
         ExifMetadata::iterator i = begin(); 
         while (i != end()) {
@@ -747,12 +749,13 @@ namespace Exiv2 {
             }
         }
         long delta = 0;
-        if (stdThumbPosition()) {
+        if (stp) {
             delta = size_;
             if (size_ > 0 && ifd0_.next() > 0) {
                 // Truncate IFD1 and thumbnail data from the data buffer
                 size_ = ifd0_.next();
                 ifd0_.setNext(0, byteOrder());
+                ifd1_.clear();
             }
             delta -= size_;
         }