Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff -up surf-2.0/surf.c surf/surf.c
|--- surf-2.0/surf.c	2017-11-26 14:29:37.963786915 +0100
|+++ surf/surf.c	2017-12-03 00:20:07.314189414 +0100
--------------------------
Patching file surf.c using Plan A...
Hunk #1 succeeded at 1032 (offset -151 lines).
done