Add generator for PDP endianness swapping

Aaru.CommonTypes/Attributes/SwapPdpEndianAttribute.cs

@@ -0,0 +1,42 @@
+// /***************************************************************************
+// Aaru Data Preservation Suite
+// ----------------------------------------------------------------------------
+//
+// Filename       : SwapPdpEndianAttribute.cs
+// Author(s)      : Natalia Portillo <claunia@claunia.com>
+//
+// Component      : Common Types.
+//
+// --[ Description ] ----------------------------------------------------------
+//
+//     Attribute to mark structs for compile-time PDP endianness swapping.
+//
+// --[ 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;
+
+namespace Aaru.CommonTypes.Attributes;
+
+/// <summary>
+///     Marks a struct for automatic generation of PDP endianness swapping code.
+///     PDP endianness swaps the two 16-bit words in 32-bit integers, but leaves other types unchanged.
+/// </summary>
+[AttributeUsage(AttributeTargets.Struct)]
+public sealed class SwapPdpEndianAttribute : Attribute {}