add Sprite support

Unity Studio/Unity Classes/SpriteAtlas.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+
+namespace Unity_Studio
+{
+    class SpriteAtlas
+    {
+        public List<PPtr> m_PackedSprites = new List<PPtr>();
+        public List<PPtr> textures = new List<PPtr>();
+        public List<RectangleF> textureRects = new List<RectangleF>();
+
+
+        public SpriteAtlas(AssetPreloadData preloadData)
+        {
+            var sourceFile = preloadData.sourceFile;
+            var a_Stream = preloadData.sourceFile.a_Stream;
+            a_Stream.Position = preloadData.Offset;
+
+            var m_Name = a_Stream.ReadAlignedString(a_Stream.ReadInt32());
+            //vector m_PackedSprites
+            var size = a_Stream.ReadInt32();
+            for (int i = 0; i < size; i++)
+            {
+                //PPtr<Sprite> data
+                m_PackedSprites.Add(sourceFile.ReadPPtr());
+            }
+            //vector m_PackedSpriteNamesToIndex
+            size = a_Stream.ReadInt32();
+            for (int i = 0; i < size; i++)
+            {
+                var data = a_Stream.ReadAlignedString(a_Stream.ReadInt32());
+            }
+            //map m_RenderDataMap
+            size = a_Stream.ReadInt32();
+            for (int i = 0; i < size; i++)
+            {
+                //pair first
+                a_Stream.Position += 24;
+                //SpriteAtlasData second
+                //  PPtr<Texture2D> texture
+                textures.Add(sourceFile.ReadPPtr());
+                // PPtr<Texture2D> alphaTexture
+                var alphaTexture = sourceFile.ReadPPtr();
+                //  Rectf textureRect
+                textureRects.Add(new RectangleF(a_Stream.ReadSingle(), a_Stream.ReadSingle(), a_Stream.ReadSingle(), a_Stream.ReadSingle()));
+                //  Vector2f textureRectOffset
+                a_Stream.Position += 8;
+                if (sourceFile.version[0] > 2017 || (sourceFile.version[0] == 2017 && sourceFile.version[1] >= 2))//2017.2 and up
+                {
+                    //  Vector2f atlasRectOffset
+                    a_Stream.Position += 8;
+                }
+                //  Vector4f uvTransform
+                //  float downscaleMultiplier
+                //  unsigned int settingsRaw
+                a_Stream.Position += 24;
+            }
+            //string m_Tag
+            //bool m_IsVariant
+        }
+    }
+}