From c8bec6549c10ffaa2f2fbad8bbc629efdf0dd125 Mon Sep 17 00:00:00 2001

From: Leon Bottou <leon@bottou.org>

Date: Thu, 17 Oct 2019 22:20:31 -0400

Subject: [PATCH 1/2] Fixed bug 309

---

 libdjvu/IW44EncodeCodec.cpp | 2 +-

 tools/ddjvu.cpp             | 2 +-

 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libdjvu/IW44EncodeCodec.cpp b/libdjvu/IW44EncodeCodec.cpp

index 00752a0..f81eaeb 100644

--- a/libdjvu/IW44EncodeCodec.cpp

+++ b/libdjvu/IW44EncodeCodec.cpp

@@ -405,7 +405,7 @@ filter_fv(short *p, int w, int h, int rowsize, int scale)

   int y = 0;

   int s = scale*rowsize;

   int s3 = s+s+s;

-  h = ((h-1)/scale)+1;

+  h = (h>0) ? ((h-1)/scale)+1 : 0;

   y += 1;

   p += s;

   while (y-3 < h)

diff --git a/tools/ddjvu.cpp b/tools/ddjvu.cpp

index 6d0df3b..7109952 100644

--- a/tools/ddjvu.cpp

+++ b/tools/ddjvu.cpp

@@ -279,7 +279,7 @@ render(ddjvu_page_t *page, int pageno)

       prect.h = (ih * 100) / dpi;

     }

   /* Process aspect ratio */

-  if (flag_aspect <= 0)

+  if (flag_aspect <= 0 && iw>0 && ih>0)

     {

       double dw = (double)iw / prect.w;

       double dh = (double)ih / prect.h;

-- 

2.23.0