Improve/fix packed data API

- Enhance directory API
- Fix `FileAccess::exists()` not checking for PackedData being disabled
- Fix moving to the parent directory (`..`)
- Allow absolute paths in existence checks

2 files changed, 48 insertions, 6 deletions

diff --git a/core/io/file_access_pack.cpp b/core/io/file_access_pack.cpp
index 37240f234a..8e8142e813 100644
--- a/core/io/file_access_pack.cpp
+++ b/core/io/file_access_pack.cpp
@@ -376,8 +376,14 @@ String DirAccessPack::get_drive(int p_drive) {
 	return "";
 }
 
-Error DirAccessPack::change_dir(String p_dir) {
+PackedData::PackedDir *DirAccessPack::_find_dir(String p_dir) {
 	String nd = p_dir.replace("\\", "/");
+
+	// Special handling since simplify_path() will forbid it
+	if (p_dir == "..") {
+		return current->parent;
+	}
+
 	bool absolute = false;
 	if (nd.begins_with("res://")) {
 		nd = nd.replace_first("res://", "");
@@ -417,13 +423,21 @@ Error DirAccessPack::change_dir(String p_dir) {
 			pd = pd->subdirs[p];
 
 		} else {
-			return ERR_INVALID_PARAMETER;
+			return nullptr;
 		}
 	}
 
-	current = pd;
+	return pd;
+}
 
-	return OK;
+Error DirAccessPack::change_dir(String p_dir) {
+	PackedData::PackedDir *pd = _find_dir(p_dir);
+	if (pd) {
+		current = pd;
+		return OK;
+	} else {
+		return ERR_INVALID_PARAMETER;
+	}
 }
 
 String DirAccessPack::get_current_dir(bool p_include_drive) {
@@ -441,13 +455,17 @@ String DirAccessPack::get_current_dir(bool p_include_drive) {
 bool DirAccessPack::file_exists(String p_file) {
 	p_file = fix_path(p_file);
 
-	return current->files.has(p_file);
+	PackedData::PackedDir *pd = _find_dir(p_file.get_base_dir());
+	if (!pd) {
+		return false;
+	}
+	return pd->files.has(p_file.get_file());
 }
 
 bool DirAccessPack::dir_exists(String p_dir) {
 	p_dir = fix_path(p_dir);
 
-	return current->subdirs.has(p_dir);
+	return _find_dir(p_dir) != nullptr;
 }
 
 Error DirAccessPack::make_dir(String p_dir) {
diff --git a/core/io/file_access_pack.h b/core/io/file_access_pack.h
index 348bc0c450..8c5a032732 100644
--- a/core/io/file_access_pack.h
+++ b/core/io/file_access_pack.h
@@ -113,6 +113,9 @@ public:
 	_FORCE_INLINE_ FileAccess *try_open_path(const String &p_path);
 	_FORCE_INLINE_ bool has_path(const String &p_path);
 
+	_FORCE_INLINE_ DirAccess *try_open_directory(const String &p_path);
+	_FORCE_INLINE_ bool has_directory(const String &p_path);
+
 	PackedData();
 	~PackedData();
 };
@@ -189,6 +192,16 @@ bool PackedData::has_path(const String &p_path) {
 	return files.has(PathMD5(p_path.md5_buffer()));
 }
 
+bool PackedData::has_directory(const String &p_path) {
+	DirAccess *da = try_open_directory(p_path);
+	if (da) {
+		memdelete(da);
+		return true;
+	} else {
+		return false;
+	}
+}
+
 class DirAccessPack : public DirAccess {
 	PackedData::PackedDir *current;
 
@@ -196,6 +209,8 @@ class DirAccessPack : public DirAccess {
 	List<String> list_files;
 	bool cdir = false;
 
+	PackedData::PackedDir *_find_dir(String p_dir);
+
 public:
 	virtual Error list_dir_begin();
 	virtual String get_next();
@@ -225,4 +240,13 @@ public:
 	~DirAccessPack() {}
 };
 
+DirAccess *PackedData::try_open_directory(const String &p_path) {
+	DirAccess *da = memnew(DirAccessPack());
+	if (da->change_dir(p_path) != OK) {
+		memdelete(da);
+		da = nullptr;
+	}
+	return da;
+}
+
 #endif // FILE_ACCESS_PACK_H