Handle tiff format with long dimension values, fixes #158

lib/fastimage/fastimage_parsing/exif.rb

@@ -30,8 +30,16 @@ module FastImageParsing
       tag_count = @stream.read(2).unpack(@short)[0]
       tag_count.downto(1) do
         type = @stream.read(2).unpack(@short)[0]
-        @stream.read(6)
-        data = @stream.read(2).unpack(@short)[0]
+        data_type = @stream.read(2).unpack(@short)[0]
+        @stream.read(4)
+
+        if data_type == 4
+          data = @stream.read(4).unpack(@long)[0]
+        else
+          data = @stream.read(2).unpack(@short)[0]
+          @stream.read(2)
+        end
+
         case type
         when 0x0100 # image width
           @width = data
@@ -43,7 +51,6 @@ module FastImageParsing
         if @width && @height && @orientation
           return # no need to parse more
         end
-        @stream.read(2)
       end
     end
   

test/test.rb

@@ -60,6 +60,7 @@ GoodFixtures = {
   "avif/red_green_flash.avif" => [:avif, [256, 256]],
   "isobmff.jxl" => [:jxl, [1280,1600]],
   "naked.jxl" => [:jxl, [1000,1000]],
+  "test.dng" => [:tiff, [4032, 3024]]
 }
 
 BadFixtures = [