add swiftUI code

iOS-SwiftUI-Code/Library/Discovery/NWSocket.swift

@@ -0,0 +1,63 @@
+import Foundation
+import Libbox
+import Network
+
+public class NWSocket {
+    private let connection: NWConnection
+
+    public init(_ connection: NWConnection) {
+        self.connection = connection
+    }
+
+    public func read() throws -> Data {
+        let semaphore = DispatchSemaphore(value: 0)
+        var result: Result<Data, Error>!
+        connection.receive(minimumIncompleteLength: 2, maximumLength: 2) { content, _, _, error in
+            if let error {
+                result = .failure(error)
+            } else {
+                result = .success(content!)
+            }
+            semaphore.signal()
+        }
+        semaphore.wait()
+        let lengthChunk = try result.get()
+        let length = Int(LibboxDecodeLengthChunk(lengthChunk))
+        connection.receive(minimumIncompleteLength: length, maximumLength: length) { content, _, _, error in
+            if let error {
+                result = .failure(error)
+            } else {
+                result = .success(content!)
+            }
+            semaphore.signal()
+        }
+        semaphore.wait()
+        return try result.get()
+    }
+
+    public func write(_ data: Data?) throws {
+        guard let data else {
+            return
+        }
+        let semaphore = DispatchSemaphore(value: 0)
+        var result: Error?
+        connection.send(content: LibboxEncodeChunkedMessage(data), isComplete: false, completion: .contentProcessed { error in
+            result = error
+            semaphore.wait()
+        })
+        if let result {
+            throw result
+        }
+    }
+
+    public func send(_ data: Data?) {
+        guard let data else {
+            return
+        }
+        connection.send(content: LibboxEncodeChunkedMessage(data), completion: .idempotent)
+    }
+
+    public func cancel() {
+        connection.cancel()
+    }
+}