Unity fixes + decrunching

rust/Cargo.toml

@@ -35,9 +35,10 @@ lz4_flex = { version = "0.10.0", default-features = false, features = ["safe-dec
 lzma-rs = { version = "0.3.0", features = ["raw_decoder"] }
 naga = { git = "https://github.com/magcius/wgpu", branch = "issue-4349", features = ["glsl-in", "wgsl-out"] }
 num_enum = "0.5.7"
-wasm-bindgen = "0.2.95"
+wasm-bindgen = "=0.2.95"
 web-sys = { version = "0.3.48", features = ["console"] }
 nalgebra-glm = "0.19.0"
 rand = "0.8.5"
 getrandom = { version = "0.2.15", features = ["js"] }
 noclip-macros = { version = "*", path = "./noclip-macros" }
+texture2ddecoder = { git = "https://github.com/wgreenberg/texture2ddecoder" }

rust/src/compression.rs

@@ -38,3 +38,27 @@ pub fn deflate_raw_decompress(src: &[u8]) -> Vec<u8> {
     inflate::inflate_bytes(src).unwrap()
 }
 
+#[wasm_bindgen(js_name = "CrunchTexture")]
+pub struct CrunchTexture {
+    handle: texture2ddecoder::CrunchHandle,
+}
+
+#[wasm_bindgen(js_class = "CrunchTexture")]
+impl CrunchTexture {
+    pub fn new(data: &[u8]) -> Result<Self, String> {
+        let handle = texture2ddecoder::CrunchHandle::new(data)
+            .map_err(|err| format!("{:?}", err))?;
+        Ok(Self {
+            handle,
+        })
+    }
+
+    pub fn get_num_levels(&self) -> u32 {
+        self.handle.get_num_levels()
+    }
+
+    pub fn decode_level(&self, data: &[u8], level_index: u32) -> Result<Vec<u8>, String> {
+        self.handle.unpack_level(data, level_index)
+            .map_err(|err| err.into())
+    }
+}

rust/src/unity/asset_file.rs

@@ -40,7 +40,8 @@ impl AssetFile {
     pub fn append_metadata_chunk(&mut self, data: &[u8]) -> Result<(), String> {
         // data will be the file from bytes 0..data_offset, so skip to where the metadata starts
         let bitslice = BitSlice::from_slice(data);
-        let (rest, _) = SerializedFileHeader::read(&bitslice, ()).unwrap();
+        let (rest, _) = SerializedFileHeader::read(&bitslice, ())
+            .map_err(|err| format!("failed to parse metadata file header: {:?}", err))?;
         match SerializedFileMetadata::read(rest, self.header.version) {
             Ok((_, metadata)) => self.metadata = Some(metadata),
             Err(err) => return Err(format!("failed to parse metadata: {:?}", err)),
@@ -77,7 +78,7 @@ impl AssetFile {
                 ClassID::MonoBehavior
             };
             result.push(AssetFileObject {
-                file_id:obj.file_id,
+                file_id: obj.file_id,
                 byte_start,
                 byte_size: obj.byte_size as usize,
                 class_id,