Aaru/Aaru.Images/ZZZRawImage/Identify.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies raw image, that is, user data sector by sector copy.
//
// --[ 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 System.Linq;
using Aaru.CommonTypes.Interfaces;
using Aaru.Helpers;

namespace Aaru.Images;

public sealed partial class ZZZRawImage
{
#region IWritableOpticalImage Members

    /// <inheritdoc />
    public bool Identify(IFilter imageFilter)
    {
        _extension = Path.GetExtension(imageFilter.Filename)?.ToLower();

        switch(_extension)
        {
            case ".1kn":
                return imageFilter.DataForkLength % 1024 == 0;
            case ".2kn":
                return imageFilter.DataForkLength % 2048 == 0;
            case ".4kn":
                return imageFilter.DataForkLength % 4096 == 0;
            case ".8kn":
                return imageFilter.DataForkLength % 8192 == 0;
            case ".16kn":
                return imageFilter.DataForkLength % 16384 == 0;
            case ".32kn":
                return imageFilter.DataForkLength % 32768 == 0;
            case ".64kn":
                return imageFilter.DataForkLength % 65536 == 0;
            case ".512":
            case ".512e":
                return imageFilter.DataForkLength % 512 == 0;
            case ".128":
                return imageFilter.DataForkLength % 128 == 0;
            case ".256":
                return imageFilter.DataForkLength % 256 == 0;
            case ".toast" when imageFilter.DataForkLength % 2048 == 0:
                return true;
            case ".toast" when imageFilter.DataForkLength % 2056 == 0:
                return true;
            case ".raw" when imageFilter.DataForkLength % 2064 == 0:
                return true;

            // Handle this properly on Open()
            //case ".toast" when imageFilter.DataForkLength % 2336 == 0: return true;
            case ".2352" or ".toast"
                when imageFilter.DataForkLength % 2352 == 0 && imageFilter.DataForkLength <= 846720000:
            case ".2448" when imageFilter.DataForkLength % 2448 == 0 && imageFilter.DataForkLength <= 881280000:
                var    sync   = new byte[12];
                Stream stream = imageFilter.GetDataForkStream();
                stream.Position = 0;
                stream.EnsureRead(sync, 0, 12);

                return _cdSync.SequenceEqual(sync);
        }

        // Check if file is not multiple of 512
        if(imageFilter.DataForkLength % 512 == 0) return true;

        if(_extension == ".hdf" && imageFilter.DataForkLength % 256 == 0) return true;

        // Only for single track data CDs
        if(imageFilter.DataForkLength % 2352 == 0 && imageFilter.DataForkLength <= 846720000 ||
           imageFilter.DataForkLength % 2448 == 0 && imageFilter.DataForkLength <= 881280000)
        {
            var    sync   = new byte[12];
            Stream stream = imageFilter.GetDataForkStream();
            stream.Position = 0;
            stream.EnsureRead(sync, 0, 12);

            return _cdSync.SequenceEqual(sync);
        }

        // Check known disk sizes with sectors smaller than 512
        switch(imageFilter.DataForkLength)
        {
#region Commodore

            case 174848:
            case 175531:
            case 197376:
            case 351062:
            case 822400:

#endregion Commodore

            case 81664:
            case 116480:
            case 242944:
            case 256256:
            case 287488:
            case 306432:
            case 495872:
            case 988416:
            case 995072:
            case 1021696:
            case 1146624:
            case 1177344:
            case 1222400:
            case 1304320:
            case 1255168:
                return true;
            default:
                return false;
        }
    }

#endregion
}