Update DownloadSystem

Assets/YooAsset/Runtime/DownloadSystem/UnityWebDataRequester.cs

@@ -0,0 +1,113 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 下载器
+	/// 说明：UnityWebRequest(UWR) supports reading streaming assets since 2017.1
+	/// </summary>
+	internal class UnityWebDataRequester
+	{
+		protected UnityWebRequest _webRequest;
+		protected UnityWebRequestAsyncOperation _operationHandle;
+
+		/// <summary>
+		/// 请求URL地址
+		/// </summary>
+		public string URL { private set; get; }
+
+
+		/// <summary>
+		/// 发送GET请求
+		/// </summary>
+		/// <param name="timeout">超时：从请求开始计时</param>
+		public void SendRequest(string url, int timeout = 0)
+		{
+			if (_webRequest == null)
+			{
+				URL = url;
+				_webRequest = new UnityWebRequest(URL, UnityWebRequest.kHttpVerbGET);
+				DownloadHandlerBuffer handler = new DownloadHandlerBuffer();
+				_webRequest.downloadHandler = handler;
+				_webRequest.disposeDownloadHandlerOnDispose = true;
+				_webRequest.timeout = timeout;
+				_operationHandle = _webRequest.SendWebRequest();
+			}
+		}
+
+		/// <summary>
+		/// 获取下载的字节数据
+		/// </summary>
+		public byte[] GetData()
+		{
+			if (_webRequest != null && IsDone())
+				return _webRequest.downloadHandler.data;
+			else
+				return null;
+		}
+
+		/// <summary>
+		/// 获取下载的文本数据
+		/// </summary>
+		public string GetText()
+		{
+			if (_webRequest != null && IsDone())
+				return _webRequest.downloadHandler.text;
+			else
+				return null;
+		}
+
+		/// <summary>
+		/// 释放下载器
+		/// </summary>
+		public void Dispose()
+		{
+			if (_webRequest != null)
+			{
+				_webRequest.Dispose();
+				_webRequest = null;
+				_operationHandle = null;
+			}
+		}
+
+		/// <summary>
+		/// 是否完毕（无论成功失败）
+		/// </summary>
+		public bool IsDone()
+		{
+			if (_operationHandle == null)
+				return false;
+			return _operationHandle.isDone;
+		}
+
+		/// <summary>
+		/// 下载是否发生错误
+		/// </summary>
+		public bool HasError()
+		{
+#if UNITY_2020_3_OR_NEWER
+			return _webRequest.result != UnityWebRequest.Result.Success;
+#else
+			if (_webRequest.isNetworkError || _webRequest.isHttpError)
+				return true;
+			else
+				return false;
+#endif
+		}
+
+		/// <summary>
+		/// 获取错误信息
+		/// </summary>
+		public string GetError()
+		{
+			if (_webRequest != null)
+			{
+				return $"URL : {URL} Error : {_webRequest.error}";
+			}
+			return string.Empty;
+		}
+	}
+}