commit a29c5e9e66c1ba2b7d6b292430898e9ae7598e68
author Simon Butcher <simon.butcher@arm.com> Thu Feb 02 08:46:53 2017 +0000
committer Simon Butcher <simon.butcher@arm.com> Wed Feb 15 23:31:07 2017 +0200
tree ecf14ae2a9e10ad5e17f7f55876476b890ebf22e
parent 4623d83c6f5549031f72bc25b085af6eb79b28f4

Add comment to integer overflow fix in base64.c

Adds clarifying comment to the integer overflow fix in base64.c

library/base64.c

diff --git a/library/base64.c b/library/base64.c
index 305afc5..f06b57b 100644
--- a/library/base64.c
+++ b/library/base64.c
@@ -192,6 +192,10 @@
         return( 0 );
     }
 
+    /* The following expression is to calculate the following formula without
+     * risk of integer overflow in n:
+     *     n = ( ( n * 6 ) + 7 ) >> 3;
+     */
     n = ( 6 * ( n >> 3 ) ) + ( ( 6 * ( n & 0x7 ) + 7 ) >> 3 );
     n -= j;