From 65ee7c5b55ea96b0ed5c414162f29f3f607c4009 Mon Sep 17 00:00:00 2001
From: Quinn <quinnthepigeon@proton.me>
Date: Wed, 23 Jul 2025 12:18:55 +0200
Subject: [PATCH] add a function for checking whether a tag is primitive or not

mainly for niche uses
---
 src/dat/nbt.c | 14 ++++++++++++++
 src/dat/nbt.h |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/src/dat/nbt.c b/src/dat/nbt.c
index 668de65..2ca6d5f 100644
--- a/src/dat/nbt.c
+++ b/src/dat/nbt.c
@@ -98,3 +98,17 @@ int nbt_prim_tagsize(u8 tag) {
 	default:      return -1;
 	}
 }
+
+int nbt_isprim(u8 tag) {
+	switch (tag) {
+	case NBT_I8:
+	case NBT_I16:
+	case NBT_I32:
+	case NBT_F32:
+	case NBT_I64:
+	case NBT_F64:
+		return 1;
+	default:
+		return 0;
+	}
+}
diff --git a/src/dat/nbt.h b/src/dat/nbt.h
index 0295f40..be32a77 100644
--- a/src/dat/nbt.h
+++ b/src/dat/nbt.h
@@ -36,5 +36,10 @@ enum nbt_tagid {
 
 int nbt_proc(void **restrict datout, u8 const *restrict buf, size_t len);
 
+/* checks whether the tag is a primitive data tag. (not recommended for filtering tags, use a `switch`)
+ * returns a boolean value. */
+atrb_const int nbt_isprim(u8 tag);
+
+
 /* gets the tag size of primitive types, returns `>0` on success, `<0` on failure */
 atrb_const int nbt_prim_tagsize(u8 tag);