From 6a245e71427abcb92b358eeb21ba4bf3c89cbf00 Mon Sep 17 00:00:00 2001
From: Colin Leroy-Mira <colin@colino.net>
Date: Mon, 17 Aug 2026 11:22:39 +0200
Subject: [PATCH] Ignore unsupported quantization tables when we won't use them

---
 picojpeg.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/picojpeg.c b/picojpeg.c
index 2fae2a9..6cba8a5 100644
--- a/picojpeg.c
+++ b/picojpeg.c
@@ -642,8 +642,9 @@ static uint8 readSOFMarker(void)
       gCompVSamp[i] = (uint8)getBits1(4);
       gCompQuant[i] = (uint8)getBits1(8);
       
-      if (gCompQuant[i] > 1)
+      if (i < 2 && gCompQuant[i] > 1) {
          return PJPG_UNSUPPORTED_QUANT_TABLE;
+      }
    }
    
    return 0;