change name to hiddifypackettunnel

ios/HiddifyPacketTunnel/Logger.swift

@@ -0,0 +1,52 @@
+//
+//  Logger.swift
+//  SingBoxPacketTunnel
+//
+//  Created by GFWFighter on 10/24/23.
+//
+
+import Foundation
+
+class Logger {
+    private static let queue = DispatchQueue.init(label: "\(FilePath.packageName).PacketTunnelLog", qos: .utility)
+    
+    private let fileManager = FileManager.default
+    private let url: URL
+    
+    private var _fileHandle: FileHandle?
+    private var fileHandle: FileHandle? {
+        get {
+            if let _fileHandle { return _fileHandle }
+            let handle = try? FileHandle(forWritingTo: url)
+            _fileHandle = handle
+            return handle
+        }
+    }
+    
+    private var lock = NSLock()
+    
+    init(path: URL) {
+        url = path
+    }
+    
+    func write(_ message: String) {
+        Logger.queue.async { [message, unowned self] () in
+            lock.lock()
+            defer { lock.unlock() }
+            let output = message + "\n"
+            do {
+                if !self.fileManager.fileExists(atPath: url.path) {
+                    try output.write(to: url, atomically: true, encoding: .utf8)
+                } else {
+                    guard let fileHandle else {
+                        return
+                    }
+                    fileHandle.seekToEndOfFile()
+                    if let data = output.data(using: .utf8) {
+                        fileHandle.write(data)
+                    }
+                }
+            } catch {}
+        }
+    }
+}