From f6e7bbd7a56aec3272073500cd3e6c2115a27d7b Mon Sep 17 00:00:00 2001
From: oiupoyt <oiupoyt.cat@gmail.com>
Date: Thu, 1 Oct 2026 07:32:19 +0530
Subject: [PATCH] feat(assets): implement AssetDir directory iterator with
 rewind support

---
 crates/molotov-core/src/assets/dir.rs       | 31 +++++++++++++++++++++
 crates/molotov-core/src/assets/mod.rs       |  1 +
 crates/molotov-core/tests/asset_dir_test.rs | 22 +++++++++++++++
 3 files changed, 54 insertions(+)
 create mode 100644 crates/molotov-core/src/assets/dir.rs
 create mode 100644 crates/molotov-core/tests/asset_dir_test.rs

diff --git a/crates/molotov-core/src/assets/dir.rs b/crates/molotov-core/src/assets/dir.rs
new file mode 100644
index 0000000..5e568dc
--- /dev/null
+++ b/crates/molotov-core/src/assets/dir.rs
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use std::ffi::CString;
+
+pub struct AssetDir {
+    entries: Vec<CString>,
+    cursor: usize,
+}
+
+impl AssetDir {
+    pub fn new(filenames: Vec<String>) -> Self {
+        let entries = filenames
+            .into_iter()
+            .filter_map(|s| CString::new(s).ok())
+            .collect();
+        Self { entries, cursor: 0 }
+    }
+
+    pub fn get_next_filename(&mut self) -> *const libc::c_char {
+        if self.cursor < self.entries.len() {
+            let ptr = self.entries[self.cursor].as_ptr();
+            self.cursor += 1;
+            ptr
+        } else {
+            std::ptr::null()
+        }
+    }
+
+    pub fn rewind(&mut self) {
+        self.cursor = 0;
+    }
+}
diff --git a/crates/molotov-core/src/assets/mod.rs b/crates/molotov-core/src/assets/mod.rs
index ebdd1a4..897866a 100644
--- a/crates/molotov-core/src/assets/mod.rs
+++ b/crates/molotov-core/src/assets/mod.rs
@@ -1,3 +1,4 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 pub mod asset;
+pub mod dir;
 pub mod types;
diff --git a/crates/molotov-core/tests/asset_dir_test.rs b/crates/molotov-core/tests/asset_dir_test.rs
new file mode 100644
index 0000000..7f4190e
--- /dev/null
+++ b/crates/molotov-core/tests/asset_dir_test.rs
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use molotov_core::assets::dir::AssetDir;
+use std::ffi::CStr;
+
+#[test]
+fn test_asset_dir_iteration_and_rewind() {
+    let files = vec!["font.ttf".to_string(), "cursor.png".to_string(), "sound.ogg".to_string()];
+    let mut dir = AssetDir::new(files);
+
+    unsafe {
+        let f1 = dir.get_next_filename();
+        assert!(!f1.is_null());
+        assert_eq!(CStr::from_ptr(f1).to_str().unwrap(), "font.ttf");
+
+        let f2 = dir.get_next_filename();
+        assert_eq!(CStr::from_ptr(f2).to_str().unwrap(), "cursor.png");
+
+        dir.rewind();
+        let f1_again = dir.get_next_filename();
+        assert_eq!(CStr::from_ptr(f1_again).to_str().unwrap(), "font.ttf");
+    }
+}