Fetch from upstream. (#10)

Author: didntpot

minecraft/protocol/camera.go

@@ -213,6 +213,7 @@ func (x *CameraPreset) Marshal(r IO) {
 	OptionalFunc(r, &x.AudioListener, r.Uint8)
 	OptionalFunc(r, &x.PlayerEffects, r.Bool)
 	OptionalFunc(r, &x.AlignTargetAndCameraForward, r.Bool)
+	OptionalMarshaler(r, &x.AimAssist)
 }
 
 // CameraPresetAimAssist represents a preset for aim assist settings.

minecraft/protocol/writer.go

@@ -482,6 +482,11 @@ func (w *Writer) Bitset(x *Bitset, size int) {
 	u := new(big.Int)
 	u.Set(x.int)
 
+	if len(u.Bits()) == 0 {
+		_ = w.w.WriteByte(0)
+		return
+	}
+
 	for u.Cmp(varintMaxByteValue) >= 0 {
 		_ = w.w.WriteByte(byte(u.Bits()[0]) | 0x80)
 		u.Rsh(u, 7)