ico: fix interpretation of 0 widths/heights

1 files changed, 7 insertions, 2 deletions

diff --git a/sys/src/cmd/jpg/ico.c b/sys/src/cmd/jpg/ico.c
index ea7ba9a7e..7fb270ed3 100644
--- a/sys/src/cmd/jpg/ico.c
+++ b/sys/src/cmd/jpg/ico.c
@@ -13,8 +13,8 @@ struct Icon
 {
 	Icon	*next;
 
-	uchar	w;		/* icon width */
-	uchar	h;		/* icon height */
+	ushort	w;		/* icon width */
+	ushort	h;		/* icon height */
 	ushort	ncolor;		/* number of colors */
 	ushort	nplane;		/* number of bit planes */
 	ushort	bits;		/* bits per pixel */
@@ -269,6 +269,11 @@ Bgeticon(Biobuf *b, Icon *icon)
 	icon->nplane = gets(buf+12);
 	icon->bits = gets(buf+14);
 
+	if(icon->w == 0)
+		icon->w = 256;
+	if(icon->h == 0)
+		icon->h = 256;
+
 	/* limit what we handle */
 	switch(icon->bits){
 	case 1: