Added simple scanner impl.

scanner.go

@@ -0,0 +1,33 @@
+package dns
+// Implement a simple scanner, return a byte stream from an io reader.
+
+import (
+	"bufio"
+	"io"
+	"text/scanner"
+)
+
+type scan struct {
+	src *bufio.Reader
+        scanner.Position
+}
+
+func scanInit(r io.Reader) *scan {
+	s := new(scan)
+	s.src = bufio.NewReader(r)
+	return s
+}
+
+// tokenText returns the next byte from the input
+func (s *scan) tokenText() (byte, error) {
+        c, err := s.src.ReadByte()
+        if err != nil {
+                return c, err
+        }
+        if c == '\n' {
+                s.Postion.Line++
+                s.Postion.Column = 0
+        }
+        s.Position.Column++
+        return c, nil
+}