Fixed an issue with one short chunk and empty trailer

issue#81

library/server/ewsgi/specification/response/wgi_filter_response.e

@@ -20,8 +20,9 @@ feature {NONE} -- Initialization
 			res.set_post_commit_action (agent commit)
 		end
 
-	wgi_response: WGI_RESPONSE
+feature -- Access		
 
+	wgi_response: WGI_RESPONSE
 
 feature {WGI_FILTER_RESPONSE} -- Change		
 

library/server/ewsgi/specification/stream/wgi_chunked_input_stream.e

@@ -9,6 +9,9 @@ class
 
 inherit
 	WGI_INPUT_STREAM
+		redefine
+			last_character_available
+		end
 
 create
 	make
@@ -36,11 +39,17 @@ feature -- Input
 			index := index + 1
 			if index > chunk_upper then
 				read_chunk_block
-				if last_chunk_data = Void then
+				if
+					last_chunk_size = 0
+				then
 					read_trailer_and_crlf
+					last_character := '%U'
+				else
+					last_character := last_chunk_data.item (index)
 				end
+			else
+				last_character := last_chunk_data.item (index)
 			end
-			last_character := last_chunk_data.item (index)
 		end
 
 	read_string (nb: INTEGER)
@@ -54,7 +63,7 @@ feature -- Input
 			i: like index
 		do
 			last_string.wipe_out
-			if last_trailer /= Void then
+			if is_trailer_reached then
 				-- trailer already reached, no more data
 				check input.end_of_input end
 			else
@@ -103,6 +112,12 @@ feature -- Access
 	last_character: CHARACTER_8
 			-- Last item read.
 
+	last_character_available: BOOLEAN
+			-- <Precursor>
+		do
+			Result := not is_trailer_reached
+		end
+
 feature -- Access: chunk			
 
 	last_chunk_size: INTEGER
@@ -142,7 +157,13 @@ feature -- Status report
 	end_of_input: BOOLEAN
 			-- Has the end of input stream been reached?
 		do
-			Result := input.end_of_input
+			Result := input.end_of_input or is_trailer_reached
+		end
+
+	is_trailer_reached: BOOLEAN
+			-- Trailer reached?
+		do
+			Result := last_trailer /= Void
 		end
 
 feature {NONE} -- Parser
@@ -320,11 +341,7 @@ feature {NONE} -- Parser
 					check l_input.last_character = '%N' end
 				end
 			end
-			if s.is_empty then
-				last_trailer := Void
-			else
-				last_trailer := s
-			end
+			last_trailer := s
 		end
 
 feature {NONE} -- Implementation
@@ -333,7 +350,7 @@ feature {NONE} -- Implementation
 			-- Input Stream
 
 ;note
-	copyright: "2011-2012, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
+	copyright: "2011-2013, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"
 	license: "Eiffel Forum License v2 (see http://www.eiffel.com/licensing/forum.txt)"
 	source: "[
 			Eiffel Software

library/server/ewsgi/specification/stream/wgi_input_stream.e

@@ -62,14 +62,19 @@ feature -- Input
 				i > end_pos
 			loop
 				read_character
-				a_string.put (last_character, i)
-
-				if end_of_input then
-					Result := i
+				if last_character_available then
+					a_string.put (last_character, i)
+					if end_of_input then
+						Result := i
+							-- Jump out of the loop.
+						i := end_pos + 1
+					else
+						i := i + 1
+					end
+				else
+						-- reached end of input
 						-- Jump out of the loop.
 					i := end_pos + 1
-				else
-					i := i + 1
 				end
 			end
 			if not end_of_input then
@@ -107,13 +112,20 @@ feature -- Input
 				i > end_pos
 			loop
 				read_character
-				a_string.extend (last_character)
-				l_count := l_count + 1
-				if end_of_input then
+				if last_character_available then
+					a_string.extend (last_character)
+					l_count := l_count + 1
+
+					if end_of_input then
+							-- Jump out of the loop.
+						i := end_pos + 1
+					else
+						i := i + 1
+					end
+				else
+						-- reached end of input
 						-- Jump out of the loop.
 					i := end_pos + 1
-				else
-					i := i + 1
 				end
 			end
 			last_appended_count := l_count
@@ -194,6 +206,15 @@ feature -- Access
 		deferred
 		end
 
+	last_character_available: BOOLEAN
+			-- Is `last_character' available? i.e read?
+			--| with chunked encoding, we may reach the end and the `last_character'
+			--| should not be used.
+			--| to redefine in descendant if needed
+		do
+			Result := True
+		end
+
 	last_appended_count: INTEGER
 			-- Count of characters actually read by last `append_to_string' call.