move writer out

io.go

@@ -0,0 +1,12 @@
+package zek
+
+// countwriter counts bytes written to it. Does not support concurrent access.
+type countwriter struct {
+	n int64
+}
+
+// Write increments the number by len(p).
+func (w *countwriter) Write(p []byte) (n int, err error) {
+	w.n += w.n + int64(len(p))
+	return len(p), nil
+}

node.go

@@ -9,17 +9,6 @@ import (
 	"golang.org/x/net/html/charset"
 )
 
-// countwriter counts bytes written to it. Does not support concurrent access.
-type countwriter struct {
-	n int64
-}
-
-// Write increments the number by len(p).
-func (w *countwriter) Write(p []byte) (n int, err error) {
-	w.n += w.n + int64(len(p))
-	return len(p), nil
-}
-
 // Node represents an element in the XML tree. It keeps track of its name,
 // attributes, childnodes and example chardata and basic statistics, e.g. how
 // often a node has been seen within its parent node.