make azalea-registry crate

azalea-registry/Cargo.toml

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+[package]
+name = "azalea-registry"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

azalea-registry/README.md

@@ -0,0 +1,3 @@
+# Azalea Registry
+
+Minecraft has a concept called "registries", which are primarily used to determine ids in the protocol. The contents of this crate are automatically generated using Minecraft's built-in data generator.

azalea-registry/src/lib.rs

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+enum Block {
+    Air = 0,
+    Stone,
+}
+
+impl Block {
+    /// Transmutes a u32 to a Block.
+    ///
+    /// # Safety
+    /// The `id` should be less than {}.
+    #[inline]
+    pub unsafe fn from_u32_unchecked(id: u32) -> Self {
+        mem::transmute::<u32, Block>(id)
+    }
+
+    #[inline]
+    pub fn is_valid_id(id: u32) -> bool {
+        id <= 100
+    }
+}
+
+impl TryFrom<u32> for Block {
+    type Error = ();
+
+    /// Safely converts a state id to a block state.
+    fn try_from(id: u32) -> Result<Self, Self::Error> {
+        if Self::is_valid_state(state_id) {
+            Ok(unsafe { Self::from_u32_unsafe(state_id) })
+        } else {
+            Err(())
+        }
+    }
+}