io.streams.zeros: adding @erg's zero-stream.

extra/io/streams/zeros/zeros.factor

@@ -0,0 +1,20 @@
+! Copyright (C) 2010 Doug Coleman.
+! See http://factorcode.org/license.txt for BSD license.
+USING: destructors io kernel sequences ;
+IN: io.streams.zeros
+
+TUPLE: zero-stream ;
+
+C: <zero-stream> zero-stream
+
+M: zero-stream stream-element-type drop +byte+ ;
+
+M: zero-stream stream-read-unsafe drop [ drop 0 ] map! drop ;
+
+M: zero-stream stream-read1 drop 0 ;
+
+M: zero-stream stream-read-partial-unsafe stream-read-unsafe ;
+
+M: zero-stream dispose drop ;
+
+INSTANCE: zero-stream input-stream