Adding ability to serve TLS directly from Mattermost server (#4119)

vendor/github.com/miekg/dns/scanner.go

@@ -0,0 +1,43 @@
+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
+	position scanner.Position
+	eof      bool // Have we just seen a eof
+}
+
+func scanInit(r io.Reader) *scan {
+	s := new(scan)
+	s.src = bufio.NewReader(r)
+	s.position.Line = 1
+	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
+	}
+	// delay the newline handling until the next token is delivered,
+	// fixes off-by-one errors when reporting a parse error.
+	if s.eof == true {
+		s.position.Line++
+		s.position.Column = 0
+		s.eof = false
+	}
+	if c == '\n' {
+		s.eof = true
+		return c, nil
+	}
+	s.position.Column++
+	return c, nil
+}