Merge pull request #72 from Kicer86/bigtiff

Some improvements, crash fix.

src/bigtiffimage.cpp

@@ -155,7 +155,7 @@ namespace Exiv2
 
                 std::string mimeType() const
                 {
-
+                    return std::string();
                 }
 
                 void printStructure(std::ostream& os, PrintStructureOption option, int depth)
@@ -188,7 +188,7 @@ namespace Exiv2
 
                         if ( bFirst && bPrint )
                         {
-                            out << Internal::indent(depth) << Internal::stringFormat("STRUCTURE OF TIFF FILE ") << io.path() << std::endl;
+                            out << Internal::indent(depth) << Internal::stringFormat("STRUCTURE OF BIGTIFF FILE ") << io.path() << std::endl;
                             if (tooBig)
                                 out << Internal::indent(depth) << "entries = " << entries << std::endl;
                         }

src/image.cpp

@@ -221,6 +221,8 @@ namespace Exiv2 {
     bool Image::is8ByteType(uint16_t type)
     {
         return isRationalType(type)
+             || isLongLongType(type)
+             || type == Exiv2::tiffIfd8
              || type == Exiv2::tiffDouble
             ;
     }