glide setup and dependencies addition

vendor/gopkg.in/routeros.v2/proto/writer.go

@@ -0,0 +1,82 @@
+package proto
+
+import (
+	"bufio"
+	"io"
+	"sync"
+)
+
+// Writer writes words to a RouterOS device.
+type Writer interface {
+	BeginSentence()
+	WriteWord(word string)
+	EndSentence() error
+}
+
+type writer struct {
+	*bufio.Writer
+	err error
+	sync.Mutex
+}
+
+// NewWriter returns a new Writer to write to w.
+func NewWriter(w io.Writer) Writer {
+	return &writer{Writer: bufio.NewWriter(w)}
+}
+
+// BeginSentence prepares w for writing a sentence.
+func (w *writer) BeginSentence() {
+	w.Lock()
+}
+
+// EndSentence writes the end-of-sentence marker (an empty word).
+// It returns the first error that occurred on calls to methods on w.
+func (w *writer) EndSentence() error {
+	w.WriteWord("")
+	w.flush()
+	err := w.err
+	w.Unlock()
+	return err
+}
+
+// WriteWord writes one word.
+func (w *writer) WriteWord(word string) {
+	b := []byte(word)
+	w.write(encodeLength(len(b)))
+	w.write(b)
+}
+
+func (w *writer) flush() {
+	if w.err != nil {
+		return
+	}
+	err := w.Flush()
+	if err != nil {
+		w.err = err
+	}
+}
+
+func (w *writer) write(b []byte) {
+	if w.err != nil {
+		return
+	}
+	_, err := w.Write(b)
+	if err != nil {
+		w.err = err
+	}
+}
+
+func encodeLength(l int) []byte {
+	switch {
+	case l < 0x80:
+		return []byte{byte(l)}
+	case l < 0x4000:
+		return []byte{byte(l>>8) | 0x80, byte(l)}
+	case l < 0x200000:
+		return []byte{byte(l>>16) | 0xC0, byte(l >> 8), byte(l)}
+	case l < 0x10000000:
+		return []byte{byte(l>>24) | 0xE0, byte(l >> 16), byte(l >> 8), byte(l)}
+	default:
+		return []byte{0xF0, byte(l >> 24), byte(l >> 16), byte(l >> 8), byte(l)}
+	}
+}