Add VerifyLevel filed.

增加了下载文件校验等级初始化参数。

Assets/YooAsset/Runtime/AssetSystem/Loader/AssetBundleFileLoader.cs

@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
@@ -39,7 +40,7 @@ namespace YooAsset
 
 			if (_steps == ESteps.None)
 			{
-				if(MainBundleInfo.IsInvalid)
+				if (MainBundleInfo.IsInvalid)
 				{
 					_steps = ESteps.Done;
 					Status = EStatus.Failed;
@@ -158,6 +159,21 @@ namespace YooAsset
 					Status = EStatus.Failed;
 					LastError = $"Failed to load assetBundle : {MainBundleInfo.BundleName}";
 					YooLogger.Error(LastError);
+
+					// 注意：当缓存文件的校验等级为Low的时候，并不能保证缓存文件的完整性。
+					// 在AssetBundle文件加载失败的情况下，我们需要重新验证文件的完整性！
+					if (MainBundleInfo.LoadMode == BundleInfo.ELoadMode.LoadFromCache)
+					{
+						string cacheLoadPath = MainBundleInfo.GetCacheLoadPath();
+						if (DownloadSystem.CheckContentIntegrity(EVerifyLevel.High, cacheLoadPath, MainBundleInfo.SizeBytes, MainBundleInfo.CRC) == false)
+						{
+							if (File.Exists(cacheLoadPath))
+							{
+								YooLogger.Error($"Delete the invalid cache file : {cacheLoadPath}");
+								File.Delete(cacheLoadPath);
+							}
+						}
+					}
 				}
 				else
 				{

Assets/YooAsset/Runtime/DownloadSystem/DownloadSystem.cs

@@ -16,13 +16,16 @@ namespace YooAsset
 		private static readonly List<string> _removeList = new List<string>(100);
 		private static readonly Dictionary<string, string> _cachedHashList = new Dictionary<string, string>(1000);
 		private static int _breakpointResumeFileSize = int.MaxValue;
+		private static EVerifyLevel _verifyLevel = EVerifyLevel.High;
+
 
 		/// <summary>
 		/// 初始化
 		/// </summary>
-		public static void Initialize(int breakpointResumeFileSize)
+		public static void Initialize(int breakpointResumeFileSize, EVerifyLevel verifyLevel)
 		{
 			_breakpointResumeFileSize = breakpointResumeFileSize;
+			_verifyLevel = verifyLevel;
 		}
 
 		/// <summary>
@@ -145,17 +148,18 @@ namespace YooAsset
 			}
 		}
 
-		// 验证文件完整性
+		/// <summary>
-		public static bool CheckContentIntegrity(BundleInfo bundleInfo)
+		/// 验证文件完整性
-		{
+		/// </summary>
-			return CheckContentIntegrity(bundleInfo.GetCacheLoadPath(), bundleInfo.SizeBytes, bundleInfo.CRC);
-		}
-		public static bool CheckContentIntegrity(PatchBundle patchBundle)
-		{
-			string filePath = SandboxHelper.MakeCacheFilePath(patchBundle.Hash);
-			return CheckContentIntegrity(filePath, patchBundle.SizeBytes, patchBundle.CRC);
-		}
 		public static bool CheckContentIntegrity(string filePath, long size, string crc)
+		{
+			return CheckContentIntegrity(_verifyLevel, filePath, size, crc);
+		}
+
+		/// <summary>
+		/// 验证文件完整性
+		/// </summary>
+		public static bool CheckContentIntegrity(EVerifyLevel verifyLevel, string filePath, long size, string crc)
 		{
 			try
 			{
@@ -168,10 +172,17 @@ namespace YooAsset
 					return false;
 
 				// 再验证文件CRC
+				if (verifyLevel == EVerifyLevel.High)
+				{
 					string fileCRC = HashUtility.FileCRC32(filePath);
 					return fileCRC == crc;
 				}
-			catch(Exception)
+				else
+				{
+					return true;
+				}
+			}
+			catch (Exception)
 			{
 				return false;
 			}

Assets/YooAsset/Runtime/DownloadSystem/Downloader/FileDownloader.cs

@@ -81,7 +81,8 @@ namespace YooAsset
 				if (hasError == false)
 				{
 					// 注意：如果文件验证失败需要删除文件
-					if (DownloadSystem.CheckContentIntegrity(_bundleInfo) == false)
+					
+					if (DownloadSystem.CheckContentIntegrity(_bundleInfo.GetCacheLoadPath(), _bundleInfo.SizeBytes, _bundleInfo.CRC) == false)
 					{
 						hasError = true;
 						_lastError = $"Verification failed";

Assets/YooAsset/Runtime/DownloadSystem/EVerifyLevel.cs

@@ -0,0 +1,19 @@
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 下载文件校验等级
+	/// </summary>
+	public enum EVerifyLevel
+	{
+		/// <summary>
+		/// 验证文件大小
+		/// </summary>
+		Low,
+
+		/// <summary>
+		/// 验证文件大小和CRC
+		/// </summary>
+		High,
+	}
+}

Assets/YooAsset/Runtime/DownloadSystem/EVerifyLevel.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 02ad351eb8539da47a0c789e2f8c468f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Runtime/YooAssets.cs

@@ -104,6 +104,11 @@ namespace YooAsset
 			/// 启用断点续传功能的文件大小
 			/// </summary>
 			public int BreakpointResumeFileSize = int.MaxValue;
+
+			/// <summary>
+			/// 下载文件校验等级
+			/// </summary>
+			public EVerifyLevel VerifyLevel = EVerifyLevel.High;
 		}
 
 
@@ -193,7 +198,7 @@ namespace YooAsset
 				throw new Exception($"{EPlayMode.HostPlayMode} not supports WebGL platform !");
 #else
 				var hostPlayModeParameters = parameters as HostPlayModeParameters;
-				DownloadSystem.Initialize(hostPlayModeParameters.BreakpointResumeFileSize);
+				DownloadSystem.Initialize(hostPlayModeParameters.BreakpointResumeFileSize, hostPlayModeParameters.VerifyLevel);
 #endif
 			}