Fix loading encrypted files on template_release

exporters/scene_exporter.cpp

@@ -674,7 +674,7 @@
 			step = "serializing GLTF document";
 			break;
 		case ERR_FILE_CORRUPT:
-			step = "GLTF is empty or corrupt";
+			step = "GLTF validation: scene is empty or corrupt";
 			break;
 		case ERR_BUG:
 			step = "GLTF conversion";
@@ -726,6 +726,10 @@
 		errors.append("** Errors during import parameter setting:");
 		errors.append_array(import_param_error_messages);
 	}
+	if (validation_error_messages.size() > 0) {
+		errors.append("** Errors during GLTF validation:");
+		errors.append_array(validation_error_messages);
+	}
 	other_error_messages.append_array(_get_logged_error_messages());
 	if (other_error_messages.size() > 0) {
 		errors.append("** Other errors:");
@@ -1894,7 +1898,7 @@
 				}
 				if (meshes.size() > 1) {
 					SurfaceTool surface_tool;
 					for (size_t i = 0; i < meshes.size(); i++) {
 						for (size_t j = 0; j < meshes[i]->get_surface_count(); j++) {
 							if (i == 0 && j == 0) {
 								surface_tool.create_from(meshes[i], j);
@@ -2540,7 +2544,7 @@
 	String error_string;
 	Error load_err = load_model(p_dest_path, model, error_string);
 	if (load_err != OK) {
-		gltf_serialization_error_messages.append(error_string);
+		validation_error_messages.append(error_string);
 		return ERR_FILE_CORRUPT;
 	}
 	return OK;
@@ -2948,7 +2952,7 @@
 	canceled = true;
 }
 
-Error GLBExporterInstance::_get_return_error() {
+Error GLBExporterInstance::_get_return_error(const String &p_dest_path) {
 	bool set_all_externals = !updating_import_info;
 	if (updating_import_info) {
 		set_all_externals = true;
@@ -2967,6 +2971,8 @@
 	Ref<RegEx> animation_error_re = RegEx::create_from_string(ANIMATION_ERROR_PATTERN);
 
 	static const Vector<String> errors_to_ignore = {
+		"Can't set_pixel() on compressed image, sorry", // GLTFDocument couldn't decompress image, but forgot to fail
+		"Can't get_pixel() on compressed image, sorry", // GLTFDocument couldn't decompress image, but forgot to fail
 		"A node was animated, but it wasn't found in the GLTFState", // animation track not found because it's not exported
 		"Parameter \"p_target_object\" is null.", // object property animated by track not found because it's not exportable by the exporter
 		"Image width specified (0 pixels) must be greater than 0 pixels", // texture export failure caused by zero-sized source images
@@ -3059,6 +3065,15 @@
 		}
 	}
 
+	// Check if the model can be loaded; minimum validation to ensure the model is valid
+	{
+		other_error_messages.append_array(_get_logged_error_messages());
+		if (_check_model_can_load(p_dest_path) != OK) {
+			validation_error_messages.append_array(_get_logged_error_messages());
+			err = ERR_FILE_CORRUPT;
+			GDRE_SCN_EXP_FAIL_V_MSG(ERR_FILE_CORRUPT, "");
+		}
+	}
 	if (had_gltf_serialization_errors) {
 		String _ = add_errors_to_report(ERR_BUG, "");
 	} else if ((!set_all_externals || missing_dependencies.size() > 0) && err == OK) {
@@ -3704,7 +3719,7 @@
 
 	{
 		const LocalVector<Animation::Track *> &tracks = reset_animation->get_tracks();
 		for (int i = 0; i < tracks.size(); i++) {
 			Animation::Track *track = tracks[i];
 			if (track->path.get_subname_count() != 1 || !bone_track_types.has(track->type)) {
 				continue;
@@ -3816,6 +3831,7 @@
 			skeleton_path_to_skeleton.insert(node_name, skeleton);
 		}
 	}
+	Vector<StringName> skeleton_path_meshes_added;
 
 	for (auto &[skeleton_path, skeleton] : skeleton_path_to_skeleton) {
 		String skeleton_name = skeleton->get_name();
@@ -3831,9 +3847,10 @@
 			String child_name = child ? child->get_name().operator String() : skeleton_name + "_mesh_instance";
 			mesh_instance = memnew(MeshInstance3D);
 			Ref<Mesh> debug_bones_mesh = generate_debug_bones_mesh(skeleton);
+			ERR_CONTINUE_MSG(debug_bones_mesh.is_null(), vformat("Failed to generate debug bones mesh for skeleton %s in animation library %s", skeleton_name, p_original_path));
+			ERR_CONTINUE_MSG(debug_bones_mesh->get_surface_count() == 0, vformat("Generated debug bones mesh for skeleton %s in animation library %s has no surfaces!", skeleton_name, p_original_path));
 			Ref<Material> debug_bones_material = debug_bones_mesh->surface_get_material(0);
 			debug_bones_mesh->set_name(skeleton_name + "_debug_bones_mesh");
-			debug_bones_material->set_name(skeleton_name + "_debug_bones_material");
 			mesh_instance->set_mesh(debug_bones_mesh);
 			mesh_instance->set_name(child_name);
 			if (child) {
@@ -3844,10 +3861,17 @@
 				mesh_instance->set_owner(root);
 			}
 			mesh_instance->set_skeleton_path(NodePath(".."));
-			mesh_instance->set_surface_override_material(0, debug_bones_material);
+			if (debug_bones_material.is_valid()) {
+				debug_bones_material->set_name(skeleton_name + "_debug_bones_material");
+				mesh_instance->set_surface_override_material(0, debug_bones_material);
+			} else {
+				WARN_PRINT(vformat("No material found for debug bones mesh for skeleton %s in animation library %s", skeleton_name, p_original_path));
+			}
 		}
 		mesh_instance->set_skin(skin);
+		skeleton_path_meshes_added.append(skeleton_path);
 	}
+	ERR_FAIL_COND_V_MSG(skeleton_path_meshes_added.size() == 0, ERR_FILE_CORRUPT, vformat("No meshes added for skeleton paths in animation library %s", p_original_path));
 	AnimationPlayer *animation_player = memnew(AnimationPlayer);
 	animation_library->set_path_cache(p_original_path);
 	animation_player->set_name("AnimationPlayer");
@@ -4424,7 +4448,7 @@
 Vector<String> GLBExporterInstance::_get_logged_error_messages() {
 	auto errors = supports_multithread() ? GDRELogger::get_thread_errors() : GDRELogger::get_errors();
 	Vector<String> ret;
 	for (auto &err : errors) {
 		String lstripped = err.strip_edges(true, false);
 		if (!lstripped.begins_with("GDScript backtrace")) {
 			ret.push_back(err.strip_edges(false, true));
@@ -4462,12 +4486,8 @@
 	if (updating_import_info) {
 		_update_import_params(p_dest_path);
 	}
-	// Check if the model can be loaded; minimum validation to ensure the model is valid
-	err = _check_model_can_load(p_dest_path);
-	if (err) {
-		GDRE_SCN_EXP_FAIL_V_MSG(ERR_FILE_CORRUPT, "");
-	}
-	err = _get_return_error();
+
+	err = _get_return_error(p_dest_path);
 
 	return err;
 }

exporters/scene_exporter.h

@@ -153,6 +153,7 @@ class GLBExporterInstance {
 	Vector<String> import_param_error_messages;
 	Vector<String> dependency_resolution_list;
 	Vector<String> other_error_messages;
+	Vector<String> validation_error_messages;
 
 	constexpr static const char *const COPYRIGHT_STRING_FORMAT = "The Creators of '%s'";
 
@@ -180,7 +181,7 @@ class GLBExporterInstance {
 	void convert_animation_tracks_to_v4_for_player(AnimationPlayer *p_player);
 
 	void _unload_deps();
-	Error _get_return_error();
+	Error _get_return_error(const String &p_dest_path);
 	Node *_instantiate_scene(Ref<PackedScene> scene);
 
 	void set_path_options(Dictionary &import_opts, const String &path, const String &prefix = "save_to_file");

standalone/gdre_main.tscn

@@ -21,6 +21,12 @@
 [ext_resource type="PackedScene" uid="uid://bhxdw5q2etvki" path="res://gdre_export_report.tscn" id="16_htlpu"]
 [ext_resource type="PackedScene" uid="uid://8tgbmg7tg5ys" path="res://gdre_patch_translation.tscn" id="16_mjm1x"]
 
+[sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_6hx8r"]
+content_margin_left = 4.0
+content_margin_top = 4.0
+content_margin_right = 4.0
+content_margin_bottom = 4.0
+
 [sub_resource type="ButtonGroup" id="ButtonGroup_x51e8"]
 
 [node name="root" type="GodotREEditorStandalone" unique_id=1603667437]
@@ -63,11 +69,14 @@ custom_minimum_size = Vector2(2.08165e-12, 36)
 layout_mode = 2
 placeholder_text = "<e.g. 000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F>"
 
-[node name="Label2" type="Label" parent="SetEncryptionKeyWindow/VBoxContainer" unique_id=1933890505]
+[node name="Label2" type="RichTextLabel" parent="SetEncryptionKeyWindow/VBoxContainer" unique_id=1547524909]
 custom_minimum_size = Vector2(2.08165e-12, 2.08165e-12)
 layout_mode = 2
 tooltip_text = "Optional decryption script for games with custom encryption"
-text = "Set Custom Decryption Script..."
+theme_override_styles/normal = SubResource("StyleBoxEmpty_6hx8r")
+bbcode_enabled = true
+text = "Set Custom Decryption Script... [url=https://github.com/GDRETools/gdsdecomp/blob/master/docs/custom_decryptors.md](What's this?)[/url]"
+fit_content = true
 
 [node name="HBoxContainer2" type="HBoxContainer" parent="SetEncryptionKeyWindow/VBoxContainer" unique_id=1842488725]
 layout_mode = 2

standalone/gdre_theme.tres

@@ -437,6 +437,8 @@ image = SubResource("Image_1dhk2")
 
 [sub_resource type="StyleBoxEmpty" id="StyleBoxEmpty_qm34x"]
 
+[sub_resource type="StyleBoxEmpty" id="1395"]
+
 [sub_resource type="StyleBoxFlat" id="StyleBoxFlat_0mbvf"]
 content_margin_left = 6.0
 content_margin_top = 4.0
@@ -973,8 +975,6 @@ content_margin_bottom = 1.0
 texture = SubResource("529")
 region_rect = Rect2(0, 0, 16, 16)
 
-[sub_resource type="StyleBoxEmpty" id="1395"]
-
 [sub_resource type="Image" id="Image_c0mi8"]
 data = {
 "data": PackedByteArray(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 112, 112, 112, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 152, 223, 223, 223, 151, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 164, 222, 222, 222, 199, 222, 222, 222, 199, 223, 223, 223, 164, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 163, 222, 222, 222, 199, 222, 222, 222, 164, 222, 222, 222, 164, 222, 222, 222, 199, 223, 223, 223, 163, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 163, 222, 222, 222, 199, 222, 222, 222, 164, 165, 165, 165, 17, 165, 165, 165, 17, 222, 222, 222, 164, 222, 222, 222, 199, 223, 223, 223, 163, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 223, 223, 223, 156, 222, 222, 222, 199, 222, 222, 222, 165, 166, 166, 166, 17, 0, 0, 0, 0, 0, 0, 0, 0, 166, 166, 166, 17, 222, 222, 222, 165, 222, 222, 222, 199, 223, 223, 223, 156, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 222, 222, 222, 154, 222, 222, 222, 159, 166, 166, 166, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 166, 166, 166, 18, 222, 222, 222, 159, 222, 222, 222, 154, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 110, 110, 110, 0, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 110, 110, 110, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 112, 112, 112, 0, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 222, 222, 222, 150, 223, 223, 223, 152, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 153, 222, 222, 222, 151, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 222, 222, 222, 156, 222, 222, 222, 199, 223, 223, 223, 164, 167, 167, 167, 16, 0, 0, 0, 0, 0, 0, 0, 0, 167, 167, 167, 16, 223, 223, 223, 164, 222, 222, 222, 199, 222, 222, 222, 156, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 165, 165, 165, 17, 222, 222, 222, 164, 222, 222, 222, 199, 223, 223, 223, 163, 167, 167, 167, 16, 167, 167, 167, 16, 223, 223, 223, 163, 222, 222, 222, 199, 222, 222, 222, 164, 165, 165, 165, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 166, 166, 166, 17, 222, 222, 222, 165, 222, 222, 222, 199, 223, 223, 223, 163, 223, 223, 223, 163, 222, 222, 222, 199, 222, 222, 222, 165, 166, 166, 166, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 166, 166, 166, 17, 223, 223, 223, 165, 222, 222, 222, 199, 222, 222, 222, 199, 223, 223, 223, 165, 166, 166, 166, 17, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 166, 166, 166, 18, 222, 222, 222, 153, 222, 222, 222, 153, 166, 166, 166, 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 111, 111, 111, 0, 111, 111, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
@@ -1438,6 +1438,13 @@ FlatMenuButton/colors/icon_hover_color = Color(0.93845, 0.93845, 0.93845, 1)
 FlatMenuButton/colors/icon_hover_pressed_color = Color(0.443137, 0.737255, 0.992157, 1)
 FlatMenuButton/colors/icon_normal_color = Color(0.847474, 0.847474, 0.847474, 1)
 FlatMenuButton/colors/icon_pressed_color = Color(0.443137, 0.737255, 0.992157, 1)
+FlatRichTextLabel/colors/default_color = Color(0.79902, 0.807843, 0.827451, 1)
+FlatRichTextLabel/colors/font_color_shadow = Color(0, 0, 0, 0)
+FlatRichTextLabel/constants/shadow_as_outline = 0
+FlatRichTextLabel/constants/shadow_offset_x = 1
+FlatRichTextLabel/constants/shadow_offset_y = 1
+FlatRichTextLabel/styles/focus = SubResource("1359")
+FlatRichTextLabel/styles/normal = SubResource("1359")
 FoldableContainer/styles/focus = SubResource("StyleBoxFlat_0mbvf")
 FoldableContainer/styles/panel = SubResource("StyleBoxFlat_twpvv")
 FoldableContainer/styles/title_collapsed_hover_panel = SubResource("StyleBoxFlat_e2oel")

tests/test_gdre_project_loading.cpp

@@ -1,9 +1,7 @@
-#include "../compat/resource_compat_binary.h"
-#include "../compat/resource_compat_text.h"
-
 #include "test_common.h"
 #include "tests/test_macros.h"
 
+#include "bytecode/bytecode_base.h"
 #include "utility/common.h"
 #include "utility/gdre_settings.h"
 
@@ -25,12 +23,12 @@ namespace TestGdreProjectLoading {
 // 32 0s
 static const String empty_key = "0000000000000000000000000000000000000000000000000000000000000000";
 
-inline Error create_test_pck(const String &pck_path, const HashMap<String, String> &paths, const String &key = empty_key, bool encrypt_directory = false) {
+inline Error create_test_pck(const String &pck_path, const HashMap<String, String> &paths, const String &key = empty_key, bool encrypt_directory = false, bool encrypt_files = false) {
 	PCKPacker pck;
 	Error err = pck.pck_start(pck_path, 32, key, encrypt_directory);
 	ERR_FAIL_COND_V(err, err);
 	for (const auto &path : paths) {
-		err = pck.add_file(path.key, path.value);
+		err = pck.add_file(path.key, path.value, encrypt_files);
 		ERR_FAIL_COND_V(err, err);
 	}
 	err = pck.flush(false);
@@ -112,7 +110,7 @@ TEST_CASE("[GDSDecomp][ProjectConfigLoader] loading example from current engine"
 	gdre::rimraf(binary_project_path);
 }
 
-TEST_CASE("[GDSDecomp] GDRESettings project loading") {
+TEST_CASE("[GDSDecomp][ProjectLoading] GDRESettings project loading") {
 	REQUIRE(gdre::ensure_dir(get_tmp_path()) == OK);
 	auto tmp_pck_path = get_tmp_path().path_join("test.pck");
 	auto tmp_project_path = get_tmp_path().path_join("project.binary");
@@ -147,7 +145,7 @@ TEST_CASE("[GDSDecomp] GDRESettings project loading") {
 	gdre::rimraf(tmp_pck_path);
 }
 
-TEST_CASE("[GDSDecomp] FileAccessGDRE tests") {
+TEST_CASE("[GDSDecomp][ProjectLoading] FileAccessGDRE tests") {
 	CHECK(gdre::ensure_dir(get_tmp_path()) == OK);
 	auto tmp_pck_path = get_tmp_path().path_join("FileAccessGDRETest.pck");
 	auto tmp_test_file = get_tmp_path().path_join("test.txt");
@@ -179,7 +177,7 @@ TEST_CASE("[GDSDecomp] FileAccessGDRE tests") {
 	gdre::rimraf(tmp_pck_path);
 }
 
-TEST_CASE("[GDSDecomp] Check opening encrypted PCKs") {
+TEST_CASE("[GDSDecomp][ProjectLoading] Check opening encrypted PCKs") {
 	REQUIRE(GDRESettings::get_singleton());
 	CHECK(gdre::ensure_dir(get_tmp_path()) == OK);
 	auto tmp_pck_path = get_tmp_path().path_join("test.pck");
@@ -195,7 +193,7 @@ TEST_CASE("[GDSDecomp] Check opening encrypted PCKs") {
 	};
 	static const String key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f";
 
-	CHECK(create_test_pck(tmp_pck_path, files, key, true) == OK);
+	CHECK(create_test_pck(tmp_pck_path, files, key, true, true) == OK);
 
 	auto settings = GDRESettings::get_singleton();
 	REQUIRE(settings);
@@ -206,6 +204,10 @@ TEST_CASE("[GDSDecomp] Check opening encrypted PCKs") {
 
 		test_pck_files(files);
 
+		Ref<FileAccessGDRE> fa = FileAccess::open("res://test.txt", FileAccess::READ);
+		REQUIRE(fa.is_valid());
+		CHECK(fa->get_proxy_class_name() == "FileAccessEncrypted");
+
 		CHECK(settings->unload_project() == OK);
 		settings->reset_encryption_key();
 	}
@@ -219,6 +221,9 @@ TEST_CASE("[GDSDecomp] Check opening encrypted PCKs") {
 		CHECK(settings->load_project({ tmp_pck_path }, false) == OK);
 
 		test_pck_files(files);
+		Ref<FileAccessGDRE> fa = FileAccess::open("res://test.txt", FileAccess::READ);
+		REQUIRE(fa.is_valid());
+		CHECK(fa->get_proxy_class_name() == "FileAccessEncryptedCustom");
 
 		CHECK(settings->unload_project() == OK);
 		settings->reset_custom_decryptor();
@@ -229,6 +234,39 @@ TEST_CASE("[GDSDecomp] Check opening encrypted PCKs") {
 	gdre::rimraf(tmp_pck_path);
 }
 
+TEST_CASE("[GDSDecomp][ProjectLoading] Check opening PCK with custom pack source") {
+	REQUIRE(GDRESettings::get_singleton());
+	CHECK(gdre::ensure_dir(get_tmp_path()) == OK);
+	auto tmp_pck_path = get_tmp_path().path_join("test.pck");
+	auto tmp_test_file = get_tmp_path().path_join("test.txt");
+	auto tmp_project_path = get_tmp_path().path_join("project.binary");
+	REQUIRE(ProjectSettings::get_singleton());
+	ProjectSettings::get_singleton()->save_custom(tmp_project_path);
+
+	CHECK(store_file_as_string(tmp_test_file, "dummy") == OK);
+	HashMap<String, String> files = {
+		{ "res://test.txt", tmp_test_file },
+		{ "res://project.binary", tmp_project_path }
+	};
+	CHECK(create_test_pck(tmp_pck_path, files) == OK);
+
+	auto settings = GDRESettings::get_singleton();
+	REQUIRE(settings);
+
+	GDScriptLanguage::get_singleton()->init();
+	CHECK(ClassDB::class_exists(StringName("PackSourceCustom")));
+	String custom_pack_source_script_path = get_gdsdecomp_path().path_join("docs/gdre_custom_pack_source.gd");
+	CHECK(settings->add_custom_pack_source_script(custom_pack_source_script_path) == OK);
+	CHECK(settings->load_project({ tmp_pck_path }, false) == OK);
+
+	test_pck_files(files);
+
+	CHECK(settings->unload_project() == OK);
+	settings->clear_custom_pack_source_script();
+
+	gdre::rimraf(tmp_test_file);
+	gdre::rimraf(tmp_pck_path);
+}
 // Disabling this for now; fragile and kind of redundant.
 #if 0
 static constexpr const char *const export_presets =