From: kramm <kramm>
Date: Sat, 10 Sep 2005 12:30:01 +0000 (+0000)
Subject: dump out a warning if there's an overflow during matrix multiplication
X-Git-Tag: xpdf-3-01~72
X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=commitdiff_plain;h=e9dc83904a5df2c24cc62004be16cecdaea83797

dump out a warning if there's an overflow during matrix multiplication
---

diff --git a/lib/modules/swftools.c b/lib/modules/swftools.c
index 5f16339..37c8e8b 100644
--- a/lib/modules/swftools.c
+++ b/lib/modules/swftools.c
@@ -26,8 +26,11 @@
 #define S64 long long
 SFIXED RFXSWF_SP(SFIXED a1,SFIXED a2,SFIXED b1,SFIXED b2)
 { S64 a;
-  a = (S64)a1*(S64)b1+(S64)a2*(S64)b2;
-  return (SFIXED)(a>>16);
+  a = ((S64)a1*(S64)b1+(S64)a2*(S64)b2)>>16;
+  SFIXED result = (SFIXED)(a);
+  if(a!=result) 
+      fprintf(stderr, "Warning: overflow in matrix multiplication");
+  return result;
 }
 SFIXED RFXSWF_QFIX(int zaehler,int nenner) // bildet Quotient von zwei INTs in SFIXED
 { S64 z = zaehler<<16;