[STFS] Implement Identify.

Aaru.Archives/Stfs/Info.cs

@@ -0,0 +1,26 @@
+using System;
+using System.IO;
+using Aaru.CommonTypes.Interfaces;
+using Aaru.Helpers;
+
+namespace Aaru.Archives;
+
+public sealed partial class Stfs
+{
+    /// <inheritdoc />
+    public bool Identify(IFilter filter)
+    {
+        if(filter.DataForkLength < Marshal.SizeOf<RemotePackage>()) return false;
+
+        Stream stream = filter.GetDataForkStream();
+        stream.Position = 0;
+
+        byte[] hdr = new byte[Marshal.SizeOf<RemotePackage>()];
+
+        stream.ReadExactly(hdr, 0, hdr.Length);
+
+        RemotePackage header = Marshal.ByteArrayToStructureBigEndian<RemotePackage>(hdr);
+
+        return header.Magic is PackageMagic.Console or PackageMagic.Live or PackageMagic.Microsoft;
+    }
+}

Aaru.Archives/Stfs/Unimplemented.cs

@@ -12,8 +12,6 @@ public sealed partial class Stfs
 {
 #region IArchive Members
 
-    /// <inheritdoc />
-    public bool Identify(IFilter filter) => throw new NotImplementedException();
 
     /// <inheritdoc />
     public ErrorNumber Open(IFilter filter, Encoding encoding) => throw new NotImplementedException();