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Hook CheckFileExistence so game natively loads addon Bindings.xml

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Move the CheckFileExistence (0x654DD0) hook from customassets into
main.zig's core file hooks. Embedded files now pass the game's
preloadFileWithFlags check, so LoadAddonRecursive handles Bindings.xml
loading naturally — respecting addon enabled/disabled state. Only hidden
addons still need explicit binding loading.
This commit is contained in:
MarcelineVQ
2026-03-08 12:37:59 -07:00
parent 00e7e8b472
commit 9e4cbe4aaf
2 changed files with 56 additions and 55 deletions
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src/main.zig
+39 -13
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@@ -751,6 +751,29 @@ fn loadModelAsyncDetour(model: u32, file_handle: u32, should_use_callback: u32)
return model_load_hook.callOriginal(.{ model, file_handle, should_use_callback });
}
// --- Hook 6: CheckFileExistence (0x654DD0) ---
// __fastcall(ECX=filename, EDX=flags, stack=outputBuffer) → EAX (bool)
// Tells the game whether a file exists in the VFS. Without this, embedded
// files are invisible to preloadFileWithFlags, so LoadAddonRecursive skips
// Bindings.xml (and SavedVariables) for our addons.
const CheckFileExistenceFn = fn (u32, u32, u32) callconv(fc) u32;
var cfe_hook: hook.Detour(CheckFileExistenceFn) = .{};
fn checkFileExistenceDetour(filename_ptr: u32, flags: u32, output_buffer_ptr: u32) callconv(fc) u32 {
if (filename_ptr != 0) {
// Embedded DLL files
const path: [*:0]const u8 = @ptrFromInt(filename_ptr);
if (findEmbeddedFile(path) != null) return 1;
// Loose disk files (customassets module)
if (build_opts.customassets and customassets.isActive()) {
if (customassets.looseFilesLookup(filename_ptr, output_buffer_ptr)) return 1;
}
}
return cfe_hook.callOriginal(.{ filename_ptr, flags, output_buffer_ptr });
}
// --- Install/remove in-memory file hooks ---
fn installFileHooks() void {
@@ -759,10 +782,12 @@ fn installFileHooks() void {
_ = read_file_hook.attach(0x648460, &readFileDetour);
_ = cleanup_file_handle_hook.attach(0x648730, &cleanupFileHandleDetour);
_ = model_load_hook.attach(0x71d4e0, &loadModelAsyncDetour);
_ = cfe_hook.attach(0x654DD0, &checkFileExistenceDetour);
con.print("[file] in-memory file hooks installed\n");
}
fn removeFileHooks() void {
cfe_hook.detach();
model_load_hook.detach();
process_async_hook.detach();
cleanup_file_handle_hook.detach();
@@ -828,10 +853,10 @@ fn callLoadAddonTOC(addon_name: [*:0]const u8) void {
// =============================================================================
// Hook: LoadAddonsRecursively (0x51F600)
// With SetupAddonProcessing registering our addons, the game's own
// LoadAddonRecursive now handles loading files, Bindings.xml, and saved
// variables for embedded addons. This hook is kept for any future
// post-load work but no longer manually loads addon files.
// Non-hidden addons are fully handled by the game's LoadAddonRecursive (which
// respects enabled/disabled state) — our CheckFileExistence hook makes their
// embedded files visible to preloadFileWithFlags. Hidden addons bypass
// LoadAddonRecursive, so we load their TOC and bindings explicitly here.
// =============================================================================
var load_addons_hook: hook.Detour(fn (u32) callconv(fc) void) = .{};
@@ -866,16 +891,17 @@ fn loadAddonsDetour(error_handler: u32) callconv(fc) void {
error_handler,
);
}
}
// Bindings.xml must be loaded explicitly for all addons -- the game's
// preloadFileWithFlags doesn't go through our file hook.
if (comptime hasFile(paths, "Bindings.xml")) {
callLoadUIBindingsFromFile(
"Interface\\AddOns\\" ++ addon_name ++ "\\Bindings.xml",
&md5ctx,
error_handler,
);
// Hidden addons bypass LoadAddonRecursive, so load bindings
// explicitly. Non-hidden addons get theirs loaded by the game
// (which respects addon enabled/disabled state).
if (comptime hasFile(paths, "Bindings.xml")) {
callLoadUIBindingsFromFile(
"Interface\\AddOns\\" ++ addon_name ++ "\\Bindings.xml",
&md5ctx,
error_handler,
);
}
}
}
}