add FileSystem.OpenRead

Author: ialex32x

Assets/UnityFS/AbstractFileSystem.cs

@@ -58,5 +58,7 @@ protected void OnLoaded()
         public abstract bool Exists(string filename);
 
         public abstract byte[] ReadAllBytes(string filename);
+
+        public abstract Stream OpenRead(string filename);
     }
 }

Assets/UnityFS/BundleAssetProvider.cs

@@ -51,6 +51,11 @@ public override byte[] ReadAllBytes(string filename)
             {
                 return _bundle.ReadAllBytes(filename);
             }
+
+            public override Stream OpenRead(string filename)
+            {
+                return _bundle.OpenRead(filename);
+            }
         }
 
         public class ZipArchiveUBundle : UBundle
@@ -88,6 +93,20 @@ public bool Exists(string filename)
                 return false;
             }
 
+            // 打开压缩包中的文件, 返回其文件流
+            public Stream OpenRead(string filename)
+            {
+                if (_zipFile != null)
+                {
+                    var entry = _zipFile.GetEntry(filename);
+                    if (entry != null)
+                    {
+                        return _zipFile.GetInputStream(entry);
+                    }
+                }
+                return null;
+            }
+
             public byte[] ReadAllBytes(string filename)
             {
                 if (_zipFile != null)

Assets/UnityFS/FailureFileSystem.cs

@@ -41,5 +41,10 @@ public byte[] ReadAllBytes(string filename)
         {
             return null;
         }
+
+        public Stream OpenRead(string filename)
+        {
+            return null;
+        }
     }
 }

Assets/UnityFS/FileSystem.cs

@@ -11,6 +11,7 @@ public interface IFileSystem
         event Action<IFileSystem> completed; // 加载完成
 
         bool Exists(string filename);
+        Stream OpenRead(string filename);
         byte[] ReadAllBytes(string filename);
     }
 }

Assets/UnityFS/OrdinaryFileSystem.cs

@@ -25,6 +25,15 @@ public override bool Exists(string filename)
             return File.Exists(Path.Combine(_rootPath, filename));
         }
 
+        public override Stream OpenRead(string filename)
+        {
+            if (string.IsNullOrEmpty(_rootPath))
+            {
+                return File.OpenRead(filename);
+            }
+            return File.OpenRead(Path.Combine(_rootPath, filename));
+        }
+
         public override byte[] ReadAllBytes(string filename)
         {
             if (string.IsNullOrEmpty(_rootPath))