Add SCHD module

src/lib.rs

@@ -147,3 +147,6 @@ pub mod tmb;
 
 /// Reading SKP files
 pub mod skp;
+
+/// Reading SCHD files
+pub mod schd;

src/schd.rs

@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2024 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use std::io::Cursor;
+
+use crate::ByteSpan;
+use binrw::{binread, binrw};
+use binrw::BinRead;
+
+#[binread]
+#[derive(Debug)]
+enum ShaderStage {
+    #[br(magic = 0u8)]
+    Vertex,
+    #[br(magic = 1u8)]
+    Pixel
+}
+
+#[binread]
+#[derive(Debug)]
+#[brw(little)]
+struct SchdHeader {
+    magic: i32, // TODO: what magic?
+
+    #[br(count = 3)]
+    #[bw(pad_size_to = 3)]
+    #[bw(map = |x : &String | x.as_bytes())]
+    #[br(map = | x: Vec<u8> | String::from_utf8(x).unwrap().trim_matches(char::from(0)).to_string())]
+    version: String,
+
+    stage: ShaderStage,
+
+    dxc_magic: u32, // TODO: WHAT MAGIC??
+
+    file_length: i32,
+    shader_offset: u32,
+    parameter_offset: u32
+}
+
+#[derive(Debug)]
+pub struct Schd {
+
+}
+
+impl Schd {
+    /// Reads an existing ULD file
+    pub fn from_existing(buffer: ByteSpan) -> Option<Self> {
+        let mut cursor = Cursor::new(buffer);
+        let header = SchdHeader::read(&mut cursor).ok()?;
+
+        Some(Schd{})
+    }
+}