如何在Swift中检测socket数据包的结尾

import Foundation
import Network

// 创建一个Socket连接
let connection = NWConnection(host: "your-host", port: your-port, using: .tcp)

// 建立通信
connection.stateUpdateHandler = { newState in
    switch newState {
    case .ready:
        print("Socket连接已建立")
        receiveData()
    case .failed(let error):
        print("连接失败: \(error)")
    default:
        break
    }
}

// 接收数据
func receiveData() {
    connection.receive(minimumIncompleteLength: 1, maximumLength: 65536) { (data, context, isComplete, error) in
        if let data = data, !data.isEmpty {
            // 将数据存储在缓冲区中
            let buffer = UnsafeBufferPointer(start: data.withUnsafeBytes { $0 }, count: data.count)
            
            // 检查缓冲区中的数据是否包含预定的数据包结尾标记
            if let endIndex = buffer.firstIndex(of: your-end-marker) {
                // 提取完整的数据包
                let packet = buffer[buffer.startIndex...endIndex]
                
                // 处理数据包
                handlePacket(packet)
                
                // 继续接收数据
                receiveData()
            } else {
                // 继续接收数据，直到完整的数据包到达为止
                receiveData()
            }
        } else if let error = error {
            print("接收数据失败: \(error)")
        }
    }
}

// 处理数据包
func handlePacket(_ packet: UnsafeBufferPointer<UInt8>) {
    // 在这里对数据包进行处理
    // ...
}

// 启动Socket连接
connection.start(queue: .main)