Brought spec up to date, improvements to stability

BinaryFormat/Chunks/SIGN.cs

@@ -0,0 +1,56 @@
+namespace RobloxFiles.BinaryFormat.Chunks
+{
+    public struct Signature
+    {
+        public int Version;
+        public long Id;
+
+        public int Length;
+        public byte[] Data;
+    }
+
+    public class SIGN : IBinaryFileChunk
+    {
+        public Signature[] Signatures;
+
+        public void Load(BinaryRobloxFileReader reader)
+        {
+            int numSignatures = reader.ReadInt32();
+            Signatures = new Signature[numSignatures];
+
+            for (int i = 0; i < numSignatures; i++)
+            {
+                var signature = new Signature
+                {
+                    Version = reader.ReadInt32(),
+                    Id = reader.ReadInt64(),
+
+                    Length = reader.ReadInt32(),
+                };
+
+                signature.Data = reader.ReadBytes(signature.Length);
+                Signatures[i] = signature;
+            }
+
+            var file = reader.File;
+            file.SIGN = this;
+        }
+
+        public void Save(BinaryRobloxFileWriter writer)
+        {
+            writer.Write(Signatures.Length);
+
+            for (int i = 0; i < Signatures.Length; i++)
+            {
+                var signature = Signatures[i];
+                signature.Length = signature.Data.Length;
+
+                writer.Write(signature.Version);
+                writer.Write(signature.Id);
+
+                writer.Write(signature.Length);
+                writer.Write(signature.Data);
+            }
+        }
+    }
+}