v0.80.30

AssetStudio/CryptoStream.cs

@@ -0,0 +1,27 @@
+using System.IO;
+
+namespace AssetStudio
+{
+    public class CryptoStream : BlockStream
+    {
+        private const long _dataPosition = 0x2A;
+
+        private readonly byte[] _xorpad;
+
+        public CryptoStream(Stream stream, byte[] xorpad) : base(stream, _dataPosition)
+        {
+            _xorpad = xorpad;
+        }
+
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            var pos = RelativePosition;
+            var read = base.Read(buffer, offset, count);
+            for (int i = 0; i < count; i++)
+            {
+                buffer[i] ^= _xorpad[pos++ % _xorpad.Length];
+            }
+            return read;
+        }
+    }
+}