commit 2d56a827ccf8d693db34f4cdb37202f34fb4048f
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 09:17:41 2017 +0000
tree df55577dd19e0a17aac5ec931e76efe5131d1aed
parent 8cf6d31f548bb5ad306ea51a50e8adc401b04f1b

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;