datastream.rb in chunky_png-1.3.5

- old
+ new

@@ -129,21 +129,21 @@
     # @return [Enumerable::Enumerator] An enumerator for the :each_chunk method.
     # @see ChunkyPNG::Datastream#each_chunk
     def chunks
       enum_for(:each_chunk)
     end
-    
+
     # Returns all the textual metadata key/value pairs as hash.
     # @return [Hash] A hash containing metadata fields and their values.
     def metadata
       metadata = {}
       other_chunks.select do |chunk|
         metadata[chunk.keyword] = chunk.value if chunk.respond_to?(:keyword)
       end
       metadata
     end
-   
+
     # Returns the uncompressed image data, combined from all the IDAT chunks
     # @return [String] The uncompressed image data for this datastream
     def imagedata
       ChunkyPNG::Chunk::ImageData.combine_chunks(data_chunks)
     end
@@ -173,9 +173,10 @@
 
     # Encodes this datastream into a string.
     # @return [String] The encoded PNG datastream.
     def to_blob
       str = StringIO.new
+      str.set_encoding('ASCII-8BIT')
       write(str)
       return str.string
     end
 
     alias :to_string :to_blob