From 0861102cd5955111404467c4fff111208bc9f06d Mon Sep 17 00:00:00 2001
From: giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8>
Date: Tue, 10 Oct 2023 17:59:39 +0000
Subject: Add comments

git-svn-id: http://svn.code.sf.net/p/netpbm/code/trunk@4746 9d0c8265-081b-0410-96cb-a4ca84ce46f8
---
 lib/libpgm1.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'lib')

diff --git a/lib/libpgm1.c b/lib/libpgm1.c
index 43458f8a..0656e1e0 100644
--- a/lib/libpgm1.c
+++ b/lib/libpgm1.c
@@ -125,6 +125,13 @@ pgm_validateComputableMaxval(gray const maxval) {
 
        Code also sometimes iterates through sample values and quits when the
        value is greater than the maxval.
+
+       Code often divides by the maxval, but we don't have to check for maxval
+       == 0 as a computability problem because that is not a valid maxval.
+
+       Note that in the PNM Plain formats, there is no upper limit for a
+       maxval, though the 'gray' type does constrain what has been passed to
+       us.
     */
 
     if (maxval > INT_MAX-1)
-- 
cgit 1.4.1