From f2cee06708455213f044c4845087508369356e10 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Mon, 18 Jun 2012 15:43:28 -0700
Subject: [PATCH] Fix floating point exception with cwebp -progress

Adds a test of enc->mb_h_ to VP8IteratorProgress() to avoid a division
by zero. Fixes issue #121.

Original patch from even rouault (even dot rouault at gmail dot com).

Change-Id: Ie5fcc1821860c0a9366d5aa11f3aded4f5b98ed7
---
 src/enc/iterator.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/enc/iterator.c b/src/enc/iterator.c
index c1aa3abe..86e473bc 100644
--- a/src/enc/iterator.c
+++ b/src/enc/iterator.c
@@ -72,7 +72,9 @@ void VP8IteratorInit(VP8Encoder* const enc, VP8EncIterator* const it) {
 int VP8IteratorProgress(const VP8EncIterator* const it, int delta) {
   VP8Encoder* const enc = it->enc_;
   if (delta && enc->pic_->progress_hook) {
-    const int percent = it->percent0_ + delta * it->y_ / (enc->mb_h_ - 1);
+    const int percent = (enc->mb_h_ <= 1)
+                      ? it->percent0_
+                      : it->percent0_ + delta * it->y_ / (enc->mb_h_ - 1);
     return WebPReportProgress(enc->pic_, percent, &enc->percent_);
   }
   return 1;