Fix a crash in Unreal Engine games when system language is Chinese

PlayTools/Controls/PTFakeTouch/NSObject+Swizzle.m

@@ -126,6 +126,20 @@ - (void) hook_setCurrentSubscription:(VSSubscription *)currentSubscription {
     // do nothing
 }
 
+- (NSString *)hook_stringByReplacingOccurrencesOfRegularExpressionPattern:(NSString *)pattern
+                                                             withTemplate:(NSString *)template
+                                                                  options:(NSRegularExpressionOptions)options
+                                                                    range:(NSRange)range {
+    // If the string is empty, return immediately to prevent a range out-of-bounds error.
+    if ([(NSString*)self isEqualToString:@""]) {
+        return @"";
+    }
+    return [self hook_stringByReplacingOccurrencesOfRegularExpressionPattern:pattern
+                                                                withTemplate:template
+                                                                     options:options
+                                                                       range:range];
+}
+
 // Hook for UIUserInterfaceIdiom
 
 // - (long long) hook_userInterfaceIdiom {
@@ -249,6 +263,16 @@ + (void)load {
     // [objc_getClass("UITraitCollection") swizzleInstanceMethod:@selector(userInterfaceIdiom) withMethod:@selector(hook_userInterfaceIdiom)];
 
     [objc_getClass("VSSubscriptionRegistrationCenter") swizzleInstanceMethod:@selector(setCurrentSubscription:) withMethod:@selector(hook_setCurrentSubscription:)];
+
+    if (PlayInfo.isUnrealEngine) {
+        // Fix NSRegularExpression crash when system language is set to Chinese
+        CFStringEncoding encoding = CFStringGetSystemEncoding();
+        if (encoding == kCFStringEncodingMacChineseSimp || encoding == kCFStringEncodingMacChineseTrad) {
+            SEL origSelector = NSSelectorFromString(@"_stringByReplacingOccurrencesOfRegularExpressionPattern:withTemplate:options:range:");
+            SEL newSelector = @selector(hook_stringByReplacingOccurrencesOfRegularExpressionPattern:withTemplate:options:range:);
+            [objc_getClass("NSString") swizzleInstanceMethod:origSelector withMethod:newSelector];
+        }
+    }
 }
 
 @end

PlayTools/PlayLoader.m

@@ -242,16 +242,8 @@ static void __attribute__((constructor)) initialize(void) {
     [PlayCover launch];
 
     if (ue_status == 0) {
-        NSURL* appFolder = [[NSBundle mainBundle] bundleURL];
-        NSArray* ueFiles = @[
-            [appFolder URLByAppendingPathComponent:@"ue4commandline.txt"],
-            [appFolder URLByAppendingPathComponent:@"uecommandline.txt"],
-        ];
-
-        for (NSURL* ueFile in ueFiles) {
-            if (!access([[ueFile path] cStringUsingEncoding:NSUTF8StringEncoding], F_OK)) {
-                ue_status = 2;
-            }
+        if (PlayInfo.isUnrealEngine) {
+            ue_status = 2;
         }
     }
 

PlayTools/Utils/PlayInfo.swift

@@ -5,11 +5,24 @@
 
 import Foundation
 
-class PlayInfo {
+class PlayInfo: NSObject {
     static var isLauncherInstalled: Bool {
         return AKInterface.shared!
             .urlForApplicationWithBundleIdentifier("io.playcover.PlayCover") != nil
     }
+
+    @objc static var isUnrealEngine: Bool {
+        let appFolder = Bundle.main.bundleURL
+        let ueFiles: [URL] = [
+            appFolder.appendingPathComponent("ue4commandline.txt"),
+            appFolder.appendingPathComponent("uecommandline.txt")
+        ]
+
+        for ueFile in ueFiles where FileManager.default.fileExists(atPath: ueFile.path) {
+            return true
+        }
+        return false
+    }
 }
 
 extension ProcessInfo {