[PATCH 7/7] tun_darwin: adapt to TUNDevice interface change

[Simon Ruderich <simon@ruderich.org>]

Broken in 996c7c4 ("Removed IFF_NO_PI from TUN linux", 2017-12-04).

Untested!
---
 src/tun_windows.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/tun_windows.go b/src/tun_windows.go
index 0711032..8bb8a66 100644
--- a/src/tun_windows.go
+++ b/src/tun_windows.go
@@ -123,7 +123,9 @@ func (f *NativeTUN) Close() error {
 	return windows.Close(f.fd)
 }
 
-func (f *NativeTUN) Write(b []byte) (int, error) {
+func (f *NativeTUN) Write(b []byte, offset int) (int, error) {
+	b := b[offset:]
+
 	f.wl.Lock()
 	defer f.wl.Unlock()
 
@@ -138,7 +140,9 @@ func (f *NativeTUN) Write(b []byte) (int, error) {
 	return getOverlappedResult(f.fd, f.wo)
 }
 
-func (f *NativeTUN) Read(b []byte) (int, error) {
+func (f *NativeTUN) Read(b []byte, offset int) (int, error) {
+	b := b[offset:]
+
 	f.rl.Lock()
 	defer f.rl.Unlock()
 
-- 
2.15.1