commit df06c200b831c29337a28302049270ecce282e7e
author Simon Butcher <simon.butcher@arm.com> Thu Feb 02 08:46:53 2017 +0000
committer Simon Butcher <simon.butcher@arm.com> Thu Feb 02 09:04:15 2017 +0000
tree e6c4abb66a7cfd0f876774d443972dc365f111ea
parent 1ea2b05af412840ee0865c7f1d621f33b29b7a45

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 d4fdf6e..4ed6b31 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;