chore: import upstream snapshot with attribution

codec/protorpc/netstring.go

@@ -0,0 +1,36 @@
+package protorpc
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+// WriteNetString writes data to a big-endian netstring on a Writer.
+// Size is always a 32-bit unsigned int.
+func WriteNetString(w io.Writer, data []byte) (written int, err error) {
+	size := make([]byte, 4)
+	binary.BigEndian.PutUint32(size, uint32(len(data)))
+	if written, err = w.Write(size); err != nil {
+		return
+	}
+	return w.Write(data)
+}
+
+// ReadNetString reads data from a big-endian netstring.
+func ReadNetString(r io.Reader) (data []byte, err error) {
+	sizeBuf := make([]byte, 4)
+	_, err = r.Read(sizeBuf)
+	if err != nil {
+		return nil, err
+	}
+	size := binary.BigEndian.Uint32(sizeBuf)
+	if size == 0 {
+		return nil, nil
+	}
+	data = make([]byte, size)
+	_, err = r.Read(data)
+	if err != nil {
+		return nil, err
+	}
+	return
+}