From 6192682829a06cdb6a278df6ecd4095f7500085e Mon Sep 17 00:00:00 2001
From: Vlad Brezae <brezaevlad@gmail.com>
Date: Tue, 30 Jan 2024 14:52:17 +0200
Subject: [PATCH] [mono][eglib] Avoid utf16 conversion if all characters are
 ASCII

---
 src/mono/mono/eglib/gfile.c | 70 +++++++++++++++++++++++++------------
 src/mono/mono/eglib/glib.h  |  1 +
 2 files changed, 48 insertions(+), 23 deletions(-)

diff --git a/src/mono/mono/eglib/gfile.c b/src/mono/mono/eglib/gfile.c
index 19331a98aba65..4d5390c193294 100644
--- a/src/mono/mono/eglib/gfile.c
+++ b/src/mono/mono/eglib/gfile.c
@@ -105,6 +105,18 @@ g_file_error_from_errno (gint err_no)
 	}
 }
 
+#ifdef HOST_WIN32
+static gboolean
+is_ascii_string (const gchar *str)
+{
+	while (*str) {
+		if (!g_isascii (*str))
+			return FALSE;
+	}
+	return TRUE;
+}
+#endif
+
 FILE*
 g_fopen (const gchar *path, const gchar *mode)
 {
@@ -114,15 +126,19 @@ g_fopen (const gchar *path, const gchar *mode)
 		return NULL;
 
 #ifdef HOST_WIN32
-	gunichar2 *wPath = g_utf8_to_utf16 (path, -1, 0, 0, 0);
-	gunichar2 *wMode = g_utf8_to_utf16 (mode, -1, 0, 0, 0);
-
-	if (!wPath || !wMode)
-		return NULL;
-
-	fp = _wfopen ((wchar_t *) wPath, (wchar_t *) wMode);
-	g_free (wPath);
-	g_free (wMode);
+	if (is_ascii_string (path) && is_ascii_string (mode)) {
+		fp = fopen (path, mode);
+	} else {
+		gunichar2 *wPath = g_utf8_to_utf16 (path, -1, 0, 0, 0);
+		gunichar2 *wMode = g_utf8_to_utf16 (mode, -1, 0, 0, 0);
+
+		if (!wPath || !wMode)
+			return NULL;
+
+		fp = _wfopen ((wchar_t *) wPath, (wchar_t *) wMode);
+		g_free (wPath);
+		g_free (wMode);
+	}
 #else
 	fp = fopen (path, mode);
 #endif
@@ -134,17 +150,21 @@ int
 g_rename (const gchar *src_path, const gchar *dst_path)
 {
 #ifdef HOST_WIN32
-	gunichar2 *wSrcPath = g_utf8_to_utf16 (src_path, -1, 0, 0, 0);
-	gunichar2 *wDstPath = g_utf8_to_utf16 (dst_path, -1, 0, 0, 0);
+	if (is_ascii_string (src_path) && is_ascii_string (dst_path)) {
+		return rename (src_path, dst_path);
+	} else {
+		gunichar2 *wSrcPath = g_utf8_to_utf16 (src_path, -1, 0, 0, 0);
+		gunichar2 *wDstPath = g_utf8_to_utf16 (dst_path, -1, 0, 0, 0);
 
-	if (!wSrcPath || !wDstPath)
-		return -1;
+		if (!wSrcPath || !wDstPath)
+			return -1;
 
-	int ret = _wrename ((wchar_t *) wSrcPath, (wchar_t *) wDstPath);
-	g_free (wSrcPath);
-	g_free (wDstPath);
+		int ret = _wrename ((wchar_t *) wSrcPath, (wchar_t *) wDstPath);
+		g_free (wSrcPath);
+		g_free (wDstPath);
 
-	return ret;
+		return ret;
+	}
 #else
 	return rename (src_path, dst_path);
 #endif
@@ -154,15 +174,19 @@ int
 g_unlink (const gchar *path)
 {
 #ifdef HOST_WIN32
-	gunichar2 *wPath = g_utf8_to_utf16 (path, -1, 0, 0, 0);
+	if (is_ascii_string (path)) {
+		return unlink (path);
+	} else {
+		gunichar2 *wPath = g_utf8_to_utf16 (path, -1, 0, 0, 0);
 
-	if (!wPath)
-		return -1;
+		if (!wPath)
+			return -1;
 
-	int ret = _wunlink ((wchar_t *) wPath);
-	g_free (wPath);
+		int ret = _wunlink ((wchar_t *) wPath);
+		g_free (wPath);
 
-	return ret;
+		return ret;
+	}
 #else
 	return unlink (path);
 #endif
diff --git a/src/mono/mono/eglib/glib.h b/src/mono/mono/eglib/glib.h
index 9a8474310bede..7ec9dcde9c8e6 100644
--- a/src/mono/mono/eglib/glib.h
+++ b/src/mono/mono/eglib/glib.h
@@ -391,6 +391,7 @@ gint    g_ascii_xdigit_value (gchar c);
 #define g_ascii_isalpha(c)   (isalpha (c) != 0)
 #define g_ascii_isprint(c)   (isprint (c) != 0)
 #define g_ascii_isxdigit(c)  (isxdigit (c) != 0)
+#define g_isascii(c)         (isascii (c) != 0)
 
 /* FIXME: g_strcasecmp supports utf8 unicode stuff */
 #ifdef _MSC_VER