From 9f927a8ed2c47af4a26f5e163007a4366e6ebb5a Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Sat, 23 Aug 2025 05:04:55 +0100
Subject: [PATCH] Implement detection of ZOO archives.

---
 Aaru.Archives/Zoo/Info.cs          | 57 ++++++++++++++++++++++++++++++
 Aaru.Archives/Zoo/Unimplemented.cs |  3 --
 2 files changed, 57 insertions(+), 3 deletions(-)
 create mode 100644 Aaru.Archives/Zoo/Info.cs

diff --git a/Aaru.Archives/Zoo/Info.cs b/Aaru.Archives/Zoo/Info.cs
new file mode 100644
index 000000000..f50e53616
--- /dev/null
+++ b/Aaru.Archives/Zoo/Info.cs
@@ -0,0 +1,57 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : Consts.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Zoo plugin.
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This library is free software; you can redistribute it and/or modify
+//     it under the terms of the GNU Lesser General Public License as
+//     published by the Free Software Foundation; either version 2.1 of the
+//     License, or (at your option) any later version.
+//
+//     This library is distributed in the hope that it will be useful, but
+//     WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+//     Lesser General Public License for more details.
+//
+//     You should have received a copy of the GNU Lesser General Public
+//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright © 2011-2025 Natalia Portillo
+// ****************************************************************************/
+
+using System.IO;
+using Aaru.CommonTypes.Interfaces;
+using Aaru.Helpers;
+
+namespace Aaru.Archives;
+
+public sealed partial class Zoo
+{
+#region IArchive Members
+
+    /// <inheritdoc />
+    public bool Identify(IFilter filter)
+    {
+        if(filter.DataForkLength < Marshal.SizeOf<ZooHeader>()) return false;
+
+        Stream stream = filter.GetDataForkStream();
+        stream.Position = 0;
+
+        byte[] hdr = new byte[Marshal.SizeOf<ZooHeader>()];
+
+        stream.ReadExactly(hdr, 0, hdr.Length);
+
+        ZooHeader header = Marshal.ByteArrayToStructureLittleEndian<ZooHeader>(hdr);
+
+        return header.zoo_tag == ZOO_TAG && header.zoo_start + header.zoo_minus == 0;
+    }
+
+#endregion
+}
\ No newline at end of file
diff --git a/Aaru.Archives/Zoo/Unimplemented.cs b/Aaru.Archives/Zoo/Unimplemented.cs
index 460268cc0..e9329b6f3 100644
--- a/Aaru.Archives/Zoo/Unimplemented.cs
+++ b/Aaru.Archives/Zoo/Unimplemented.cs
@@ -40,9 +40,6 @@ public sealed partial class Zoo
 {
 #region IArchive Members
 
-    /// <inheritdoc />
-    public bool Identify(IFilter filter) => throw new NotImplementedException();
-
     /// <inheritdoc />
     public ErrorNumber Open(IFilter filter, Encoding encoding) => throw new NotImplementedException();