tiff.rb in exifr-0.10.4

- old
+ new

@@ -35,10 +35,13 @@
   #   EXIFR::TIFF.new('DSC_0218.TIF').exposure_time   # => Rational(1, 100)
   #   EXIFR::TIFF.new('DSC_0218.TIF').orientation     # => EXIFR::TIFF::Orientation
   class TIFF
     include Enumerable
     
+    # JPEG thumbnails
+    attr_reader :jpeg_thumbnails
+    
     TAG_MAPPING = {} # :nodoc:
     TAG_MAPPING.merge!({
       :image => {
         0x00FE => :new_subfile_type,
         0x00FF => :subfile_type,
@@ -315,10 +318,17 @@
       else; raise 'no II or MM marker found'
       end
       
       @ifds = [IFD.new(data)]
       while ifd = @ifds.last.next; @ifds << ifd; end
+      
+      @jpeg_thumbnails = @ifds.map do |ifd|
+        if ifd.jpeg_interchange_format && ifd.jpeg_interchange_format_length
+          start, length = ifd.jpeg_interchange_format, ifd.jpeg_interchange_format_length
+          data[start..(start + length)]
+        end
+      end.compact
     end
     
     # Number of images.
     def size
       @ifds.size
@@ -411,9 +421,10 @@
         '@fields'
       end
     private
       def add_field(field)
         return unless tag = TAG_MAPPING[@type][field.tag]
+        
         if IFD_TAGS.include? tag
           @fields[tag] = IFD.new(@data, field.offset, tag)
         else
           value = field.value.map { |v| ADAPTERS[tag][v] } if field.value
           @fields[tag] = value.kind_of?(Array) && value.size == 1 ? value.first : value
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