Aaru/Aaru.Images/Anex86/Identify.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies Anex86 disk images.
//
// --[ 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;
using Aaru.Logging;

namespace Aaru.Images;

public sealed partial class Anex86
{
#region IWritableImage Members

    /// <inheritdoc />
    public bool Identify(IFilter imageFilter)
    {
        Stream stream = imageFilter.GetDataForkStream();
        stream.Seek(0, SeekOrigin.Begin);

        if(stream.Length < Marshal.SizeOf<Header>()) return false;

        var hdrB = new byte[Marshal.SizeOf<Header>()];
        stream.EnsureRead(hdrB, 0, hdrB.Length);

        _header = Marshal.SpanToStructureLittleEndian<Header>(hdrB);

        AaruLogging.Debug(MODULE_NAME, "fdihdr.unknown = {0}",   _header.unknown);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.hddtype = {0}",   _header.hddtype);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.hdrSize = {0}",   _header.hdrSize);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.dskSize = {0}",   _header.dskSize);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.bps = {0}",       _header.bps);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.spt = {0}",       _header.spt);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.heads = {0}",     _header.heads);
        AaruLogging.Debug(MODULE_NAME, "fdihdr.cylinders = {0}", _header.cylinders);

        return stream.Length   == _header.hdrSize + _header.dskSize &&
               _header.dskSize == _header.bps * _header.spt * _header.heads * _header.cylinders;
    }

#endregion
}