From 2de15ac054c90bdf9ab5e81777371012f89a1108 Mon Sep 17 00:00:00 2001
From: NishiOwO <nishi@nishi.boats>
Date: Thu, 27 Nov 2025 04:50:14 +0900
Subject: [PATCH] check for signature

---
 sound/drv_mp3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sound/drv_mp3.c b/sound/drv_mp3.c
index e06f85b..4370d8c 100644
--- a/sound/drv_mp3.c
+++ b/sound/drv_mp3.c
@@ -7,6 +7,16 @@
 static MDESoundContext mp3_open(const char* path) {
 	MDESoundContext ctx = malloc(sizeof(*ctx));
 	char*		s;
+	unsigned char	sig[3];
+	FILE*		f = fopen(path, "rb");
+	fread(sig, 3, 1, f);
+	if(memcmp(sig, "ID3", 3) != 0 && memcmp(sig, "\xff\xfb", 2) != 0 && memcmp(sig, "\xff\xf3", 2) != 0 && memcmp(sig, "\xff\xf2", 2) != 0) {
+		free(ctx);
+		fclose(f);
+		return NULL;
+	}
+
+	fclose(f);
 	memset(ctx, 0, sizeof(*ctx));
 
 	ctx->title  = MDEID3GetString(path, "TIT2");