Support long path in file access on windows

Changed windows file access file to check for path length and use the \\?\ long format when needed

(cherry picked from commit 59f04e16b87ed5ce013c4ed184fdac796d814dc8)

4 files changed, 21 insertions, 6 deletions

diff --git a/drivers/windows/dir_access_windows.cpp b/drivers/windows/dir_access_windows.cpp
index 7b88bd8a95..88eb89656a 100644
--- a/drivers/windows/dir_access_windows.cpp
+++ b/drivers/windows/dir_access_windows.cpp
@@ -59,6 +59,14 @@ struct DirAccessWindowsPrivate {
 	WIN32_FIND_DATAW fu; //unicode version
 };
 
+String DirAccessWindows::fix_path(String p_path) const {
+	String r_path = DirAccess::fix_path(p_path);
+	if (r_path.is_absolute_path() && !r_path.is_network_share_path() && r_path.length() > MAX_PATH) {
+		r_path = "\\\\?\\" + r_path.replace("/", "\\");
+	}
+	return r_path;
+}
+
 // CreateFolderAsync
 
 Error DirAccessWindows::list_dir_begin() {
@@ -158,6 +166,7 @@ Error DirAccessWindows::make_dir(String p_dir) {
 	p_dir = fix_path(p_dir);
 	if (p_dir.is_relative_path()) {
 		p_dir = current_dir.path_join(p_dir);
+		p_dir = fix_path(p_dir);
 	}
 
 	p_dir = p_dir.simplify_path().replace("/", "\\");
@@ -165,12 +174,6 @@ Error DirAccessWindows::make_dir(String p_dir) {
 	bool success;
 	int err;
 
-	if (!p_dir.is_network_share_path()) {
-		p_dir = "\\\\?\\" + p_dir;
-		// Add "\\?\" to the path to extend max. path length past 248, if it's not a network share UNC path.
-		// See https://msdn.microsoft.com/en-us/library/windows/desktop/aa363855(v=vs.85).aspx
-	}
-
 	success = CreateDirectoryW((LPCWSTR)(p_dir.utf16().get_data()), nullptr);
 	err = GetLastError();
 
diff --git a/drivers/windows/dir_access_windows.h b/drivers/windows/dir_access_windows.h
index 9d91c22f7e..1e55917756 100644
--- a/drivers/windows/dir_access_windows.h
+++ b/drivers/windows/dir_access_windows.h
@@ -53,6 +53,9 @@ class DirAccessWindows : public DirAccess {
 	bool _cisdir = false;
 	bool _cishidden = false;
 
+protected:
+	virtual String fix_path(String p_path) const override;
+
 public:
 	virtual Error list_dir_begin() override; ///< This starts dir listing
 	virtual String get_next() override;
diff --git a/drivers/windows/file_access_windows.cpp b/drivers/windows/file_access_windows.cpp
index 0e51586b5a..03930626a5 100644
--- a/drivers/windows/file_access_windows.cpp
+++ b/drivers/windows/file_access_windows.cpp
@@ -68,6 +68,14 @@ bool FileAccessWindows::is_path_invalid(const String &p_path) {
 	return invalid_files.has(fname);
 }
 
+String FileAccessWindows::fix_path(const String &p_path) const {
+	String r_path = FileAccess::fix_path(p_path);
+	if (r_path.is_absolute_path() && !r_path.is_network_share_path() && r_path.length() > MAX_PATH) {
+		r_path = "\\\\?\\" + r_path.replace("/", "\\");
+	}
+	return r_path;
+}
+
 Error FileAccessWindows::open_internal(const String &p_path, int p_mode_flags) {
 	if (is_path_invalid(p_path)) {
 #ifdef DEBUG_ENABLED
diff --git a/drivers/windows/file_access_windows.h b/drivers/windows/file_access_windows.h
index 453f8d3b5f..13c881e562 100644
--- a/drivers/windows/file_access_windows.h
+++ b/drivers/windows/file_access_windows.h
@@ -54,6 +54,7 @@ class FileAccessWindows : public FileAccess {
 	static HashSet<String> invalid_files;
 
 public:
+	virtual String fix_path(const String &p_path) const override;
 	virtual Error open_internal(const String &p_path, int p_mode_flags) override; ///< open a file
 	virtual bool is_open() const override; ///< true when file is open