From 8c97425fbc67b91d0c712947cc177485c55bea99 Mon Sep 17 00:00:00 2001
From: Lars Mueller <appgurulars@gmx.de>
Date: Wed, 3 Mar 2021 18:31:38 +0100
Subject: [PATCH] b3d: add support for positive nan

---
 b3d.lua | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/b3d.lua b/b3d.lua
index 64c2984..5a57ec5 100644
--- a/b3d.lua
+++ b/b3d.lua
@@ -63,8 +63,9 @@ function read(stream)
             if mantissa == 0 then
                 return sign * math.huge
             end
-            -- TODO differentiate quiet and signalling NaN as well as positive and negative
-            return 0/0
+            -- Differentiating quiet and signalling nan is not possible in Lua, hence we don't have to do it
+            -- HACK ((0/0)^1) yields nan, 0/0 yields -nan
+            return sign == 1 and ((0/0)^1) or 0/0
         end
         if exponent == 0 then
             -- subnormal value