commit 746edf4e75e686075f0659701151582b56cb4ffb
author Simon Butcher <simon.butcher@arm.com> Thu Feb 02 08:46:53 2017 +0000
committer Simon Butcher <simon.butcher@arm.com> Sat Feb 25 21:27:17 2017 +0000
tree 74eea9fc73eadb92ca66a51fb67447992490e955
parent 59abd301f53d295c9a831fdcf9f97ef2878df72a

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 3de67f0..ba69260 100644
--- a/library/base64.c
+++ b/library/base64.c
@@ -198,6 +198,10 @@
         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;