Should work for readed ios

lib/fastimage.rb

@@ -332,6 +332,7 @@ class FastImage
   end
 
   def fetch_using_read(readable)
+    readable.rewind if readable.respond_to?(:rewind)
     # Pathnames respond to read, but always return the first
     # chunk of the file unlike an IO (even though the
     # docuementation for it refers to IO). Need to supply

test/test.rb

@@ -178,6 +178,24 @@ class FastImageTest < Test::Unit::TestCase
     end
   end
 
+  def test_should_report_type_correctly_for_ios_that_have_been_read
+    GoodFixtures.each do |fn, info|
+      File.open(File.join(FixturePath, fn), "r") do |io|
+        io.read
+        assert_equal info[0], FastImage.type(io)
+      end
+    end
+  end
+
+  def test_should_report_size_correctly_for_ios_that_have_been_read
+    GoodFixtures.each do |fn, info|
+      File.open(File.join(FixturePath, fn), "r") do |io|
+        io.read
+        assert_equal info[1], FastImage.size(io)
+      end
+    end
+  end
+
   def test_should_report_size_correctly_on_io_object_twice
     GoodFixtures.each do |fn, info|
       File.open(File.join(FixturePath, fn), "r") do |io|