更新Demo

更新Demo

UnityProject/Packages/YooAsset/Runtime/DownloadSystem/Downloader/DownloadHandlerFileRange.cs

@@ -0,0 +1,87 @@
+using System;
+using System.IO;
+using UnityEngine;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 支持Unity2018版本的断点续传下载器
+	/// </summary>
+	internal class DownloadHandlerFileRange : DownloadHandlerScript
+	{
+		private string _fileSavePath;
+		private long _fileTotalSize;
+		private UnityWebRequest _webRequest;
+		private FileStream _fileStream;
+
+		private long _localFileSize = 0;
+		private long _curFileSize = 0;
+
+
+		public DownloadHandlerFileRange(string fileSavePath, long fileTotalSize, UnityWebRequest webRequest) : base(new byte[1024 * 1024])
+		{
+			_fileSavePath = fileSavePath;
+			_fileTotalSize = fileTotalSize;
+			_webRequest = webRequest;
+
+			if (File.Exists(fileSavePath))
+			{
+				FileInfo fileInfo = new FileInfo(fileSavePath);
+				_localFileSize = fileInfo.Length;
+			}
+
+			_fileStream = new FileStream(_fileSavePath, FileMode.Append, FileAccess.Write);
+			_curFileSize = _localFileSize;
+		}
+		protected override bool ReceiveData(byte[] data, int dataLength)
+		{
+			if (data == null || dataLength == 0 || _webRequest.responseCode >= 400)
+				return false;
+
+			if (_fileStream == null)
+				return false;
+
+			_fileStream.Write(data, 0, dataLength);
+			_curFileSize += dataLength;
+			return true;
+		}
+
+		/// <summary>
+		/// UnityWebRequest.downloadHandler.data
+		/// </summary>
+		protected override byte[] GetData()
+		{
+			return null;
+		}
+
+		/// <summary>
+		/// UnityWebRequest.downloadHandler.text
+		/// </summary>
+		protected override string GetText()
+		{
+			return null;
+		}
+
+		/// <summary>
+		/// UnityWebRequest.downloadProgress
+		/// </summary>
+		protected override float GetProgress()
+		{
+			return _fileTotalSize == 0 ? 0 : ((float)_curFileSize) / _fileTotalSize;
+		}
+
+		/// <summary>
+		/// 释放下载句柄
+		/// </summary>
+		public void Cleanup()
+		{
+			if (_fileStream != null)
+			{
+				_fileStream.Flush();
+				_fileStream.Dispose();
+				_fileStream = null;
+			}
+		}
+	}
+}