From 2b6772fca188aeb94f3eb9e2511f65c0fcbe4802 Mon Sep 17 00:00:00 2001
From: neonloop
Date: Wed, 8 Sep 2021 17:31:36 +0000
Subject: Avoids possible divide by zeros

---
 plat_sdl.c |  5 ++++-
 scale.c    | 12 ++++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/plat_sdl.c b/plat_sdl.c
index 76be077..c7c6050 100644
--- a/plat_sdl.c
+++ b/plat_sdl.c
@@ -360,7 +360,10 @@ void plat_sound_write(const struct audio_frame *data, int frames)
 
 void plat_sound_resize_buffer(void) {
 	size_t buf_size;
-	audio.buf_len = current_audio_buffer_size * audio.in_sample_rate / frame_rate;
+	audio.buf_len = frame_rate > 0
+		? current_audio_buffer_size * audio.in_sample_rate / frame_rate
+		: 2;
+
 	buf_size = audio.buf_len * sizeof(struct audio_frame);
 	audio.buf = realloc(audio.buf, buf_size);
 
diff --git a/scale.c b/scale.c
index 3c6265e..99d0189 100644
--- a/scale.c
+++ b/scale.c
@@ -89,6 +89,8 @@ static inline int gcd(int a, int b) {
 	return b ? gcd(b, a % b) : a;
 }
 
+static void scale_null(unsigned w, unsigned h, size_t pitch, const void *src, void *dst) {}
+
 static void scale_memcpy(unsigned w, unsigned h, size_t pitch, const void *src, void *dst) {
 	dst += dst_offs;
 	memcpy(dst, src, h * pitch);
@@ -391,8 +393,14 @@ static void scale_sharp_256xXXX_320xXXX(unsigned w, unsigned h, size_t pitch, co
 }
 
 static void scale_select_scaler(unsigned w, unsigned h, size_t pitch) {
-	double current_aspect_ratio = aspect_ratio > 0 ? aspect_ratio : ((double)w / (double)h);
-	if (w == 0 || h == 0 || pitch == 0) return;
+	double current_aspect_ratio;
+
+	if (w == 0 || h == 0 || pitch == 0) {
+		scaler = scale_null;
+		return;
+	};
+
+	current_aspect_ratio = aspect_ratio > 0 ? aspect_ratio : ((double)w / (double)h);
 
 	/* mame2000 sets resolutions / aspect ratio without notifying
 	 * of changes, new should always override old */
-- 
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