From 3d8817346d8184e3e375961cae0feec1b238e262 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Mon, 25 Sep 2017 16:32:52 -0400
Subject: [PATCH] Fixed seeking within read buffers.

---
 src/physfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/physfs.c b/src/physfs.c
index e18be8e5..9ea904b5 100644
--- a/src/physfs.c
+++ b/src/physfs.c
@@ -2889,7 +2889,7 @@ int PHYSFS_seek(PHYSFS_File *handle, PHYSFS_uint64 pos)
             /* backward? */
             ((offset < 0) && (((size_t) -offset) <= fh->bufpos)) )
         {
-            fh->bufpos += (PHYSFS_uint32) offset;
+            fh->bufpos = (size_t) (((PHYSFS_sint64) fh->bufpos) + offset);
             return 1; /* successful seek */
         } /* if */
     } /* if */