Aaru/Aaru.Images/Nero/Identify.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Identify.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Identifies Nero Burning ROM disc 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 Nero
{
#region IOpticalMediaImage Members

    /// <inheritdoc />
    public bool Identify(IFilter imageFilter)
    {
        _imageStream = imageFilter.GetDataForkStream();
        var footerV1 = new FooterV1();
        var footerV2 = new FooterV2();

        _imageStream.Seek(-8, SeekOrigin.End);
        var buffer = new byte[8];
        _imageStream.EnsureRead(buffer, 0, 8);
        footerV1.ChunkId          = BigEndianBitConverter.ToUInt32(buffer, 0);
        footerV1.FirstChunkOffset = BigEndianBitConverter.ToUInt32(buffer, 4);

        _imageStream.Seek(-12, SeekOrigin.End);
        buffer = new byte[12];
        _imageStream.EnsureRead(buffer, 0, 12);
        footerV2.ChunkId          = BigEndianBitConverter.ToUInt32(buffer, 0);
        footerV2.FirstChunkOffset = BigEndianBitConverter.ToUInt64(buffer, 4);

        AaruLogging.Debug(MODULE_NAME, "imageStream.Length = {0}",        _imageStream.Length);
        AaruLogging.Debug(MODULE_NAME, "footerV1.ChunkID = 0x{0:X8}",     footerV1.ChunkId);
        AaruLogging.Debug(MODULE_NAME, "footerV1.FirstChunkOffset = {0}", footerV1.FirstChunkOffset);
        AaruLogging.Debug(MODULE_NAME, "footerV2.ChunkID = 0x{0:X8}",     footerV2.ChunkId);
        AaruLogging.Debug(MODULE_NAME, "footerV2.FirstChunkOffset = {0}", footerV2.FirstChunkOffset);

        if(footerV2.ChunkId == NERO_FOOTER_V2 && footerV2.FirstChunkOffset < (ulong)_imageStream.Length) return true;

        return footerV1.ChunkId == NERO_FOOTER_V1 && footerV1.FirstChunkOffset < (ulong)_imageStream.Length;
    }

#endregion
}