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