Add HWC module

src/hwc.rs

@@ -0,0 +1,27 @@
+// SPDX-FileCopyrightText: 2024 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+use std::io::{Cursor, Read};
+
+use crate::ByteSpan;
+
+#[derive(Debug)]
+pub struct Hwc {
+    pub rgba: Vec<u8>,
+}
+
+const CURSOR_WIDTH: usize = 64;
+const CURSOR_HEIGHT: usize = 64;
+
+impl Hwc {
+    /// Reads an existing HWC file
+    pub fn from_existing(buffer: ByteSpan) -> Option<Self> {
+        let mut cursor = Cursor::new(buffer);
+
+        let mut rgba = Vec::new();
+        rgba.resize(CURSOR_WIDTH * CURSOR_HEIGHT * 4, 0);
+        cursor.read_exact(&mut rgba).ok()?;
+
+        Some(Self { rgba })
+    }
+}

src/lib.rs

@@ -135,3 +135,6 @@ pub mod sgb;
 
 /// Reading SCD files
 pub mod scd;
+
+/// Reading HWC files
+pub mod hwc;