first pass to fix issue #13 -- pass through IO-type objects that can'…

…t be IO#read properly (because they are too large?)

lib/rubydora/datastream.rb

@@ -118,7 +118,10 @@ def content
       rescue RestClient::ResourceNotFound
       end
 
-      content = @content.read and @content.rewind if @content.kind_of? IO
+      if @content.kind_of? IO
+        content = @content.read and @content.rewind rescue nil
+      end
+
       content ||= @content
     end
     alias_method :read, :content

spec/lib/datastream_spec.rb

@@ -152,6 +152,16 @@
 
     end
 
+    it "should pass-through IO-type content if reading the content fails" do
+      @mock_io = File.open('rubydora.gemspec')
+      @mock_io.should_receive(:read).and_raise('Rubydora #13-style read-error.')
+
+      @datastream.content = @mock_io
+
+      @datastream.content.should == @mock_io
+
+    end
+
 
   end