commit 9df03441d0d15ed0ce3f4301f27d5cbc982dcb0f
author Simon Butcher <simon.butcher@arm.com> Thu Feb 02 08:46:53 2017 +0000
committer Simon Butcher <simon.butcher@arm.com> Sun Feb 05 01:01:44 2017 +0000
tree 0fa13d85269fc0c73afcb43a3bd01248ac0cb53c
parent a540090142906300810c018852aeaa0c1236a608

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;