Aaru/Aaru.Images/Alcohol120/Read.cs

// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Read.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disc image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Reads Alcohol 120% 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 © 2011-2022 Natalia Portillo
// ****************************************************************************/

namespace Aaru.DiscImages;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Aaru.CommonTypes;
using Aaru.CommonTypes.Enums;
using Aaru.CommonTypes.Interfaces;
using Aaru.Console;
using Aaru.Decoders.CD;
using Aaru.Decoders.DVD;
using Aaru.Helpers;
using DMI = Aaru.Decoders.Xbox.DMI;

public sealed partial class Alcohol120
{
    /// <inheritdoc />
    public ErrorNumber Open(IFilter imageFilter)
    {
        Stream stream = imageFilter.GetDataForkStream();
        stream.Seek(0, SeekOrigin.Begin);

        if(stream.Length < 88)
            return ErrorNumber.InvalidArgument;

        _isDvd = false;
        var hdr = new byte[88];
        stream.Read(hdr, 0, 88);
        _header = Marshal.ByteArrayToStructureLittleEndian<Header>(hdr);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.signature = {0}",
                                   Encoding.ASCII.GetString(_header.signature));

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.version = {0}.{1}", _header.version[0],
                                   _header.version[1]);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.type = {0}", _header.type);
        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.sessions = {0}", _header.sessions);

        for(var i = 0; i < _header.unknown1.Length; i++)
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.unknown1[{1}] = 0x{0:X4}", _header.unknown1[i],
                                       i);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.bcaLength = {0}", _header.bcaLength);

        for(var i = 0; i < _header.unknown2.Length; i++)
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.unknown2[{1}] = 0x{0:X8}", _header.unknown2[i],
                                       i);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.bcaOffset = {0}", _header.bcaOffset);

        for(var i = 0; i < _header.unknown3.Length; i++)
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.unknown3[{1}] = 0x{0:X8}", _header.unknown3[i],
                                       i);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.structuresOffset = {0}", _header.structuresOffset);

        for(var i = 0; i < _header.unknown4.Length; i++)
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.unknown4[{1}] = 0x{0:X8}", _header.unknown4[i],
                                       i);

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.sessionOffset = {0}", _header.sessionOffset);
        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "header.dpmOffset = {0}", _header.dpmOffset);

        if(_header.version[0] > MAXIMUM_SUPPORTED_VERSION)
            return ErrorNumber.NotSupported;

        stream.Seek(_header.sessionOffset, SeekOrigin.Begin);
        _alcSessions = new Dictionary<int, Session>();

        for(var i = 0; i < _header.sessions; i++)
        {
            var sesHdr = new byte[24];
            stream.Read(sesHdr, 0, 24);
            Session session = Marshal.SpanToStructureLittleEndian<Session>(sesHdr);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].sessionStart = {0}", session.sessionStart,
                                       i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].sessionEnd = {0}", session.sessionEnd, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].sessionSequence = {0}",
                                       session.sessionSequence, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].allBlocks = {0}", session.allBlocks, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].nonTrackBlocks = {0}",
                                       session.nonTrackBlocks, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].firstTrack = {0}", session.firstTrack, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].lastTrack = {0}", session.lastTrack, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].unknown = 0x{0:X8}", session.unknown, i);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{1}].trackOffset = {0}", session.trackOffset, i);

            _alcSessions.Add(session.sessionSequence, session);
        }

        long footerOff         = 0;
        var  oldIncorrectImage = false;

        _alcTracks = new Dictionary<int, Track>();
        _alcToc    = new Dictionary<int, Dictionary<int, Track>>();
        uint track1Index1 = 0;

        foreach(Session session in _alcSessions.Values)
        {
            stream.Seek(session.trackOffset, SeekOrigin.Begin);
            Dictionary<int, Track> sesToc = new();

            for(var i = 0; i < session.allBlocks; i++)
            {
                var trkHdr = new byte[80];
                stream.Read(trkHdr, 0, 80);
                Track track = Marshal.ByteArrayToStructureLittleEndian<Track>(trkHdr);

                if(track.mode is TrackMode.Mode2F1Alt or TrackMode.Mode2F1Alt)
                    oldIncorrectImage = true;

                // Solve our own mistake here, sorry, but anyway seems Alcohol doesn't support DDCD
                if(track.zero  > 0  &&
                   track.point >= 1 &&
                   track.point <= 99)
                {
                    track.pmin        += (byte)(track.zero * 60);
                    track.zero        =  0;
                    oldIncorrectImage =  true;
                }

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].mode = {0}", track.mode,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].subMode = {0}",
                                           track.subMode, track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].adrCtl = {0}", track.adrCtl,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].tno = {0}", track.tno,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].point = {0:X2}", track.point,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].min = {0}", track.min,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].sec = {0}", track.sec,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].frame = {0}", track.frame,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].zero = {0}", track.zero,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].pmin = {0}", track.pmin,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].psec = {0}", track.psec,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].pframe = {0}", track.pframe,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].extraOffset = {0}",
                                           track.extraOffset, track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].sectorSize = {0}",
                                           track.sectorSize, track.point, session.sessionSequence);

                //for(int j = 0; j < track.unknown.Length; j++)
                //    AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].unknown[{2}] = {0}", track.unknown[j], i, j, session.sessionSequence);
                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].startLba = {0}",
                                           track.startLba, track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].startOffset = {0}",
                                           track.startOffset, track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].files = {0}", track.files,
                                           track.point, session.sessionSequence);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].footerOffset = {0}",
                                           track.footerOffset, track.point, session.sessionSequence);

                //for(int j = 0; j < track.unknown2.Length; j++)
                //    AaruConsole.DebugWriteLine("Alcohol 120% plugin", "session[{2}].track[{1}].unknown2[{2}] = {0}", track.unknown2[j], i, j, session.sessionSequence);

                if(track.subMode == SubchannelMode.Interleaved)
                    track.sectorSize -= 96;

                if(track.point    == 1 &&
                   track.startLba > 0)
                {
                    AaruConsole.
                        ErrorWriteLine("The disc this image represents contained a hidden track in the first pregap, that this image format cannot store. This dump is therefore, incorrect.");

                    track1Index1   = track.startLba;
                    track.startLba = 0;
                }

                if(!sesToc.ContainsKey(track.point))
                    sesToc.Add(track.point, track);

                if(track.point < 0xA0)
                    _alcTracks.Add(track.point, track);

                if(footerOff == 0)
                    footerOff = track.footerOffset;

                _isDvd |= track.mode == TrackMode.DVD;
            }

            _alcToc.Add(session.sessionSequence, sesToc);
        }

        _alcTrackExtras = new Dictionary<int, TrackExtra>();

        foreach(Track track in _alcTracks.Values)
            if(track.extraOffset > 0 &&
               !_isDvd)
            {
                var extHdr = new byte[8];
                stream.Seek(track.extraOffset, SeekOrigin.Begin);
                stream.Read(extHdr, 0, 8);
                TrackExtra extra = Marshal.SpanToStructureLittleEndian<TrackExtra>(extHdr);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "track[{1}].extra.pregap = {0}", extra.pregap,
                                           track.point);

                AaruConsole.DebugWriteLine("Alcohol 120% plugin", "track[{1}].extra.sectors = {0}", extra.sectors,
                                           track.point);

                if(track.point == 1)
                {
                    extra.pregap  =  track1Index1 + 150; // Needed because faulty UltraISO implementation
                    extra.sectors += extra.pregap - 150;
                }

                _alcTrackExtras.Add(track.point, extra);
            }
            else if(_isDvd)
            {
                var extra = new TrackExtra
                {
                    sectors = track.extraOffset
                };

                _alcTrackExtras.Add(track.point, extra);
            }

        if(footerOff > 0)
        {
            var footer = new byte[16];
            stream.Seek(footerOff, SeekOrigin.Begin);
            stream.Read(footer, 0, 16);
            _alcFooter = Marshal.SpanToStructureLittleEndian<Footer>(footer);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "footer.filenameOffset = {0}", _alcFooter.filenameOffset);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "footer.widechar = {0}", _alcFooter.widechar);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "footer.unknown1 = 0x{0:X8}", _alcFooter.unknown1);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "footer.unknown2 = 0x{0:X8}", _alcFooter.unknown2);
        }

        var alcFile = "*.mdf";

        if(_alcFooter.filenameOffset > 0)
        {
            stream.Seek(_alcFooter.filenameOffset, SeekOrigin.Begin);

            byte[] filename = _header.dpmOffset == 0 ? new byte[stream.Length - stream.Position]
                                  : new byte[_header.dpmOffset                - stream.Position];

            stream.Read(filename, 0, filename.Length);

            alcFile = _alcFooter.widechar == 1 ? StringHandlers.CToString(filename, Encoding.Unicode, true)
                          : StringHandlers.CToString(filename, Encoding.Default);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "footer.filename = {0}", alcFile);
        }

        if(_alcFooter.filenameOffset == 0)
        {
            if(Path.GetExtension(imageFilter.BasePath).ToLowerInvariant() == ".mds")
                alcFile = Path.GetFileNameWithoutExtension(imageFilter.BasePath) + ".mdf";
            else if(Path.GetExtension(imageFilter.BasePath).ToLowerInvariant() == ".xmd")
                alcFile = Path.GetFileNameWithoutExtension(imageFilter.BasePath) + ".xmf";
        }
        else if(string.Compare(alcFile, "*.mdf", StringComparison.InvariantCultureIgnoreCase) == 0)
            alcFile = Path.GetFileNameWithoutExtension(imageFilter.BasePath) + ".mdf";
        else if(string.Compare(alcFile, "*.xmf", StringComparison.InvariantCultureIgnoreCase) == 0)
            alcFile = Path.GetFileNameWithoutExtension(imageFilter.BasePath) + ".xmf";

        if(_header.bcaLength > 0 &&
           _header.bcaOffset > 0 &&
           _isDvd)
        {
            _bca = new byte[_header.bcaLength];
            stream.Seek(_header.bcaOffset, SeekOrigin.Begin);
            int readBytes = stream.Read(_bca, 0, _bca.Length);

            if(readBytes == _bca.Length)
                switch(_header.type)
                {
                    case MediumType.DVD:
                    case MediumType.DVDR:
                        _imageInfo.ReadableMediaTags.Add(MediaTagType.DVD_BCA);

                        break;
                }
        }

        _imageInfo.MediaType = MediumTypeToMediaType(_header.type);

        Sessions = new List<CommonTypes.Structs.Session>();

        foreach(Session alcSes in _alcSessions.Values)
        {
            var session = new CommonTypes.Structs.Session();

            if(!_alcTracks.TryGetValue(alcSes.firstTrack, out Track startingTrack))
                break;

            if(!_alcTracks.TryGetValue(alcSes.lastTrack, out Track endingTrack))
                break;

            if(!_alcTrackExtras.TryGetValue(alcSes.firstTrack, out _))
                break;

            if(!_alcTrackExtras.TryGetValue(alcSes.lastTrack, out TrackExtra endingTrackExtra))
                break;

            session.StartSector = startingTrack.startLba;
            session.StartTrack  = alcSes.firstTrack;
            session.Sequence    = alcSes.sessionSequence;
            session.EndSector   = endingTrack.startLba + endingTrackExtra.sectors - 1;
            session.EndTrack    = alcSes.lastTrack;

            Sessions.Add(session);

            if(session.EndSector > _imageInfo.Sectors)
                _imageInfo.Sectors = session.EndSector + 1;
        }

        if(_isDvd)
        {
            // TODO: Second layer
            if(_header.structuresOffset > 0)
            {
                var structures = new byte[4100];
                stream.Seek(_header.structuresOffset, SeekOrigin.Begin);
                stream.Read(structures, 0, 4100);
                _dmi = new byte[2052];
                _pfi = new byte[2052];

                // TODO: CMI
                Array.Copy(structures, 4, _dmi, 4, 2048);
                Array.Copy(structures, 0x804, _pfi, 4, 2048);

                _pfi[0] = 0x08;
                _pfi[1] = 0x02;
                _dmi[0] = 0x08;
                _dmi[1] = 0x02;

                PFI.PhysicalFormatInformation? pfi0 = PFI.Decode(_pfi, _imageInfo.MediaType);

                // All discs I tested the disk category and part version (as well as the start PSN for DVD-RAM) where modified by Alcohol
                // So much for archival value
                if(pfi0.HasValue)
                {
                    _imageInfo.MediaType = pfi0.Value.DiskCategory switch
                                           {
                                               DiskCategory.DVDPR    => MediaType.DVDPR,
                                               DiskCategory.DVDPRDL  => MediaType.DVDPRDL,
                                               DiskCategory.DVDPRW   => MediaType.DVDPRW,
                                               DiskCategory.DVDPRWDL => MediaType.DVDPRWDL,
                                               DiskCategory.DVDR => pfi0.Value.PartVersion >= 6 ? MediaType.DVDRDL
                                                                        : MediaType.DVDR,
                                               DiskCategory.DVDRAM => MediaType.DVDRAM,
                                               DiskCategory.DVDRW => pfi0.Value.PartVersion >= 15 ? MediaType.DVDRWDL
                                                                         : MediaType.DVDRW,
                                               DiskCategory.HDDVDR   => MediaType.HDDVDR,
                                               DiskCategory.HDDVDRAM => MediaType.HDDVDRAM,
                                               DiskCategory.HDDVDROM => MediaType.HDDVDROM,
                                               DiskCategory.HDDVDRW  => MediaType.HDDVDRW,
                                               DiskCategory.Nintendo => pfi0.Value.DiscSize == DVDSize.Eighty
                                                                            ? MediaType.GOD : MediaType.WOD,
                                               DiskCategory.UMD => MediaType.UMD,
                                               _                => MediaType.DVDROM
                                           };

                    if(DMI.IsXbox(_dmi))
                        _imageInfo.MediaType = MediaType.XGD;
                    else if(DMI.IsXbox360(_dmi))
                        _imageInfo.MediaType = MediaType.XGD2;

                    var tmp = new byte[2048];
                    Array.Copy(_dmi, 4, tmp, 0, 2048);
                    _dmi = tmp;
                    tmp  = new byte[2048];
                    Array.Copy(_pfi, 4, tmp, 0, 2048);
                    _pfi = tmp;

                    _imageInfo.ReadableMediaTags.Add(MediaTagType.DVD_PFI);
                    _imageInfo.ReadableMediaTags.Add(MediaTagType.DVD_DMI);
                }
            }
        }
        else if(_header.type == MediumType.CD)
        {
            var data       = false;
            var mode2      = false;
            var firstAudio = false;
            var firstData  = false;
            var audio      = false;

            foreach(Track alcoholTrack in _alcTracks.Values)
            {
                // First track is audio
                firstAudio |= alcoholTrack.point == 1 && alcoholTrack.mode is TrackMode.Audio or TrackMode.AudioAlt;

                // First track is data
                firstData |= alcoholTrack.point == 1 &&
                             alcoholTrack.mode != TrackMode.Audio && alcoholTrack.mode != TrackMode.AudioAlt;

                // Any non first track is data
                data |= alcoholTrack.point != 1 && alcoholTrack.mode != TrackMode.Audio && alcoholTrack.mode != TrackMode.AudioAlt;

                // Any non first track is audio
                audio |= alcoholTrack.point != 1 && alcoholTrack.mode is TrackMode.Audio or TrackMode.AudioAlt;

                switch(alcoholTrack.mode)
                {
                    case TrackMode.Mode2:
                    case TrackMode.Mode2F1:
                    case TrackMode.Mode2F2:
                    case TrackMode.Mode2F1Alt:
                    case TrackMode.Mode2F2Alt:
                        mode2 = true;

                        break;
                }
            }

            if(!data &&
               !firstData)
                _imageInfo.MediaType = MediaType.CDDA;
            else if(firstAudio         &&
                    data               &&
                    Sessions.Count > 1 &&
                    mode2)
                _imageInfo.MediaType = MediaType.CDPLUS;
            else if(firstData && audio || mode2)
                _imageInfo.MediaType = MediaType.CDROMXA;
            else if(!audio)
                _imageInfo.MediaType = MediaType.CDROM;
            else
                _imageInfo.MediaType = MediaType.CD;
        }

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "ImageInfo.mediaType = {0}", _imageInfo.MediaType);

        Partitions = new List<Partition>();
        _offsetMap = new Dictionary<uint, ulong>();

        foreach(Track trk in _alcTracks.Values)
        {
            if(_alcTrackExtras.TryGetValue(trk.point, out TrackExtra extra))
            {
                var partition = new Partition
                {
                    Description = $"Track {trk.point}.",
                    Start       = trk.startLba,
                    Size        = extra.sectors * trk.sectorSize,
                    Length      = extra.sectors,
                    Sequence    = trk.point,
                    Offset      = trk.startOffset,
                    Type        = trk.mode.ToString()
                };

                Partitions.Add(partition);
            }

            if(trk.startLba >= extra.pregap)
                _offsetMap[trk.point] = trk.startLba - extra.pregap;
            else
                _offsetMap[trk.point] = trk.startLba;

            switch(trk.mode)
            {
                case TrackMode.Mode1:
                case TrackMode.Mode1Alt:
                case TrackMode.Mode2F1:
                case TrackMode.Mode2F1Alt:
                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSync))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEcc))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEcc);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEccP))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccP);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEccQ))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccQ);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEdc))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);

                    if(_imageInfo.SectorSize < 2048)
                        _imageInfo.SectorSize = 2048;

                    break;
                case TrackMode.Mode2:
                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSync))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);

                    if(_imageInfo.SectorSize < 2336)
                        _imageInfo.SectorSize = 2336;

                    break;
                case TrackMode.Mode2F2:
                case TrackMode.Mode2F2Alt:
                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSync))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);

                    if(!_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEdc))
                        _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);

                    if(_imageInfo.SectorSize < 2324)
                        _imageInfo.SectorSize = 2324;

                    break;
                case TrackMode.DVD:
                    _imageInfo.SectorSize = 2048;

                    break;
                default:
                    _imageInfo.SectorSize = 2352;

                    break;
            }

            if(trk.subMode != SubchannelMode.None &&
               !_imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubchannel))
                _imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubchannel);
        }

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "printing partition map");

        foreach(Partition partition in Partitions)
        {
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "Partition sequence: {0}", partition.Sequence);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition name: {0}", partition.Name);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition description: {0}", partition.Description);

            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition type: {0}", partition.Type);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition starting sector: {0}", partition.Start);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition sectors: {0}", partition.Length);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition starting offset: {0}", partition.Offset);
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "\tPartition size in bytes: {0}", partition.Size);
        }

        _imageInfo.Application = "Alcohol 120%";

        AaruConsole.DebugWriteLine("Alcohol 120% plugin", "Data filename: {0}", alcFile);

        var filtersList = new FiltersList();
        _alcImage = filtersList.GetFilter(alcFile);

        if(_alcImage == null)
        {
            AaruConsole.ErrorWriteLine("Cannot open data file");

            return ErrorNumber.NoSuchFile;
        }

        _imageInfo.ImageSize            = (ulong)_alcImage.DataForkLength;
        _imageInfo.CreationTime         = _alcImage.CreationTime;
        _imageInfo.LastModificationTime = _alcImage.LastWriteTime;
        _imageInfo.XmlMediaType         = XmlMediaType.OpticalDisc;
        _imageInfo.Version              = $"{_header.version[0]}.{_header.version[1]}";

        if(!_isDvd)
        {
            AaruConsole.DebugWriteLine("Alcohol 120% plugin", "Rebuilding TOC");
            byte firstSession = byte.MaxValue;
            byte lastSession  = 0;
            var  tocMs        = new MemoryStream();

            tocMs.Write(new byte[]
            {
                0, 0
            }, 0, 2); // Reserved for TOC session numbers

            foreach(KeyValuePair<int, Dictionary<int, Track>> sessionToc in _alcToc)
            {
                if(sessionToc.Key < firstSession)
                    firstSession = (byte)sessionToc.Key;

                if(sessionToc.Key > lastSession)
                    lastSession = (byte)sessionToc.Key;

                foreach(Track sessionTrack in sessionToc.Value.Values)
                {
                    tocMs.WriteByte((byte)sessionToc.Key);
                    tocMs.WriteByte(sessionTrack.adrCtl);
                    tocMs.WriteByte(sessionTrack.tno);
                    tocMs.WriteByte(sessionTrack.point);
                    tocMs.WriteByte(sessionTrack.min);
                    tocMs.WriteByte(sessionTrack.sec);
                    tocMs.WriteByte(sessionTrack.frame);
                    tocMs.WriteByte(sessionTrack.zero);
                    tocMs.WriteByte(sessionTrack.pmin);
                    tocMs.WriteByte(sessionTrack.psec);
                    tocMs.WriteByte(sessionTrack.pframe);
                }
            }

            _fullToc    = tocMs.ToArray();
            _fullToc[0] = firstSession;
            _fullToc[1] = lastSession;

            _imageInfo.ReadableMediaTags.Add(MediaTagType.CD_FullTOC);
            _imageInfo.ReadableSectorTags.Add(SectorTagType.CdTrackFlags);
        }

        if(_imageInfo.MediaType == MediaType.XGD2)
            if(_imageInfo.Sectors is 25063 or 4229664 or 4246304) // Wxripper unlock
                _imageInfo.MediaType = MediaType.XGD3;

        AaruConsole.VerboseWriteLine("Alcohol 120% image describes a disc of type {0}", _imageInfo.MediaType);

        if(oldIncorrectImage)
            AaruConsole.
                WriteLine("Incorrect Alcohol 120% image created by an old version of Aaru. Convert image to correct it.");

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public ErrorNumber ReadMediaTag(MediaTagType tag, out byte[] buffer)
    {
        buffer = null;

        switch(tag)
        {
            case MediaTagType.DVD_BCA:
                buffer = _bca?.Clone() as byte[];

                return buffer != null ? ErrorNumber.NoError : ErrorNumber.NoData;

            case MediaTagType.DVD_PFI:
                buffer = _bca?.Clone() as byte[];

                return buffer != null ? ErrorNumber.NoError : ErrorNumber.NoData;

            case MediaTagType.DVD_DMI:
                buffer = _bca?.Clone() as byte[];

                return buffer != null ? ErrorNumber.NoError : ErrorNumber.NoData;

            case MediaTagType.CD_FullTOC:
                buffer = _bca?.Clone() as byte[];

                return buffer != null ? ErrorNumber.NoError : ErrorNumber.NoData;

            default: return ErrorNumber.NotSupported;
        }
    }

    /// <inheritdoc />
    public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer) => ReadSectors(sectorAddress, 1, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSectorTag(ulong sectorAddress, SectorTagType tag, out byte[] buffer) =>
        ReadSectorsTag(sectorAddress, 1, tag, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSector(ulong sectorAddress, uint track, out byte[] buffer) =>
        ReadSectors(sectorAddress, 1, track, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag, out byte[] buffer) =>
        ReadSectorsTag(sectorAddress, 1, track, tag, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
    {
        buffer = null;

        foreach(KeyValuePair<uint, ulong> kvp in _offsetMap)
            if(sectorAddress >= kvp.Value)
                foreach(Track track in _alcTracks.Values)
                {
                    if(track.point != kvp.Key ||
                       !_alcTrackExtras.TryGetValue(track.point, out TrackExtra extra))
                        continue;

                    if(sectorAddress - kvp.Value >= extra.sectors + extra.pregap)
                        continue;

                    return ReadSectors(sectorAddress - kvp.Value, length, kvp.Key, out buffer);
                }

        return ErrorNumber.SectorNotFound;
    }

    /// <inheritdoc />
    public ErrorNumber ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag, out byte[] buffer)
    {
        buffer = null;

        foreach(KeyValuePair<uint, ulong> kvp in _offsetMap)
            if(sectorAddress >= kvp.Value)
                foreach(Track track in _alcTracks.Values)
                {
                    if(track.point != kvp.Key ||
                       !_alcTrackExtras.TryGetValue(track.point, out TrackExtra extra))
                        continue;

                    if(sectorAddress - kvp.Value >= extra.sectors + extra.pregap)
                        continue;

                    return ReadSectorsTag(sectorAddress - kvp.Value, length, kvp.Key, tag, out buffer);
                }

        return ErrorNumber.SectorNotFound;
    }

    /// <inheritdoc />
    public ErrorNumber ReadSectors(ulong sectorAddress, uint length, uint track, out byte[] buffer)
    {
        buffer = null;

        if(!_alcTracks.TryGetValue((int)track, out Track alcTrack) ||
           !_alcTrackExtras.TryGetValue((int)track, out TrackExtra alcExtra))
            return ErrorNumber.OutOfRange;

        if(length + sectorAddress > alcExtra.sectors + alcExtra.pregap)
            return ErrorNumber.OutOfRange;

        uint sectorOffset;
        uint sectorSize;
        uint sectorSkip;
        var  mode2 = false;

        switch(alcTrack.mode)
        {
            case TrackMode.Mode1:
            case TrackMode.Mode1Alt:
            {
                sectorOffset = 16;
                sectorSize   = 2048;
                sectorSkip   = 288;

                break;
            }

            case TrackMode.Mode2:
            case TrackMode.Mode2F1:
            case TrackMode.Mode2F1Alt:
            case TrackMode.Mode2F2:
            case TrackMode.Mode2F2Alt:
            {
                mode2        = true;
                sectorOffset = 0;
                sectorSize   = 2352;
                sectorSkip   = 0;

                break;
            }

            case TrackMode.Audio:
            case TrackMode.AudioAlt:
            {
                sectorOffset = 0;
                sectorSize   = 2352;
                sectorSkip   = 0;

                break;
            }

            case TrackMode.DVD:
            {
                sectorOffset = 0;
                sectorSize   = 2048;
                sectorSkip   = 0;

                break;
            }

            default: return ErrorNumber.NotSupported;
        }

        switch(alcTrack.subMode)
        {
            case SubchannelMode.None:
                sectorSkip += 0;

                break;
            case SubchannelMode.Interleaved:
                sectorSkip += 96;

                break;
            default: return ErrorNumber.NotSupported;
        }

        buffer = new byte[sectorSize * length];

        if(alcTrack.point  == 1 &&
           alcExtra.pregap > 150)
        {
            if(sectorAddress + 150 < alcExtra.pregap)
                return ErrorNumber.NoError;

            sectorAddress -= alcExtra.pregap - 150;
        }

        uint pregapBytes = alcExtra.pregap * (sectorOffset + sectorSize + sectorSkip);
        var  fileOffset  = (long)alcTrack.startOffset;

        if(alcTrack.startOffset >= pregapBytes)
            fileOffset = (long)(alcTrack.startOffset - pregapBytes);

        _imageStream = _alcImage.GetDataForkStream();
        var br = new BinaryReader(_imageStream);

        br.BaseStream.Seek(fileOffset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip)),
                           SeekOrigin.Begin);

        if(mode2)
        {
            var mode2Ms = new MemoryStream((int)(sectorSize * length));

            buffer = br.ReadBytes((int)((sectorSize + sectorSkip) * length));

            for(var i = 0; i < length; i++)
            {
                var sector = new byte[sectorSize];
                Array.Copy(buffer, (sectorSize + sectorSkip) * i, sector, 0, sectorSize);
                sector = Sector.GetUserDataFromMode2(sector);
                mode2Ms.Write(sector, 0, sector.Length);
            }

            buffer = mode2Ms.ToArray();
        }
        else if(sectorOffset == 0 &&
                sectorSkip   == 0)
            buffer = br.ReadBytes((int)(sectorSize * length));
        else
            for(var i = 0; i < length; i++)
            {
                br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
                byte[] sector = br.ReadBytes((int)sectorSize);
                br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
                Array.Copy(sector, 0, buffer, i * sectorSize, sectorSize);
            }

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public ErrorNumber ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag,
                                      out byte[] buffer)
    {
        buffer = null;

        if(tag == SectorTagType.CdTrackFlags)
            track = (uint)sectorAddress;

        if(!_alcTracks.TryGetValue((int)track, out Track alcTrack) ||
           !_alcTrackExtras.TryGetValue((int)track, out TrackExtra alcExtra))
            return ErrorNumber.SectorNotFound;

        if(length + sectorAddress > alcExtra.sectors + alcExtra.pregap)
            return ErrorNumber.OutOfRange;

        uint sectorOffset;
        uint sectorSize;
        uint sectorSkip;

        if(alcTrack.mode == TrackMode.DVD)
            return ErrorNumber.NotSupported;

        switch(tag)
        {
            case SectorTagType.CdSectorEcc:
            case SectorTagType.CdSectorEccP:
            case SectorTagType.CdSectorEccQ:
            case SectorTagType.CdSectorEdc:
            case SectorTagType.CdSectorHeader:
            case SectorTagType.CdSectorSubchannel:
            case SectorTagType.CdSectorSubHeader:
            case SectorTagType.CdSectorSync: break;
            case SectorTagType.CdTrackFlags:
                buffer = new[]
                {
                    (byte)(alcTrack.adrCtl & 0x0F)
                };

                return ErrorNumber.NoError;
            default: return ErrorNumber.NotSupported;
        }

        switch(alcTrack.mode)
        {
            case TrackMode.Mode1:
            case TrackMode.Mode1Alt:
                switch(tag)
                {
                    case SectorTagType.CdSectorSync:
                    {
                        sectorOffset = 0;
                        sectorSize   = 12;
                        sectorSkip   = 2340;

                        break;
                    }

                    case SectorTagType.CdSectorHeader:
                    {
                        sectorOffset = 12;
                        sectorSize   = 4;
                        sectorSkip   = 2336;

                        break;
                    }

                    case SectorTagType.CdSectorSubHeader: return ErrorNumber.NotSupported;
                    case SectorTagType.CdSectorEcc:
                    {
                        sectorOffset = 2076;
                        sectorSize   = 276;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorEccP:
                    {
                        sectorOffset = 2076;
                        sectorSize   = 172;
                        sectorSkip   = 104;

                        break;
                    }

                    case SectorTagType.CdSectorEccQ:
                    {
                        sectorOffset = 2248;
                        sectorSize   = 104;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorEdc:
                    {
                        sectorOffset = 2064;
                        sectorSize   = 4;
                        sectorSkip   = 284;

                        break;
                    }

                    case SectorTagType.CdSectorSubchannel:
                    {
                        switch(alcTrack.subMode)
                        {
                            case SubchannelMode.Interleaved:

                                sectorOffset = 2352;
                                sectorSize   = 96;
                                sectorSkip   = 0;

                                break;
                            default: return ErrorNumber.NotSupported;
                        }

                        break;
                    }

                    default: return ErrorNumber.NotSupported;
                }

                break;
            case TrackMode.Mode2:
            {
                switch(tag)
                {
                    case SectorTagType.CdSectorSync:
                    case SectorTagType.CdSectorHeader:
                    case SectorTagType.CdSectorEcc:
                    case SectorTagType.CdSectorEccP:
                    case SectorTagType.CdSectorEccQ: return ErrorNumber.NotSupported;
                    case SectorTagType.CdSectorSubHeader:
                    {
                        sectorOffset = 0;
                        sectorSize   = 8;
                        sectorSkip   = 2328;

                        break;
                    }

                    case SectorTagType.CdSectorEdc:
                    {
                        sectorOffset = 2332;
                        sectorSize   = 4;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorSubchannel:
                    {
                        switch(alcTrack.subMode)
                        {
                            case SubchannelMode.Interleaved:

                                sectorOffset = 2352;
                                sectorSize   = 96;
                                sectorSkip   = 0;

                                break;
                            default: return ErrorNumber.NotSupported;
                        }

                        break;
                    }

                    default: return ErrorNumber.NotSupported;
                }

                break;
            }

            case TrackMode.Mode2F1:
            case TrackMode.Mode2F1Alt:
                switch(tag)
                {
                    case SectorTagType.CdSectorSync:
                    {
                        sectorOffset = 0;
                        sectorSize   = 12;
                        sectorSkip   = 2340;

                        break;
                    }

                    case SectorTagType.CdSectorHeader:
                    {
                        sectorOffset = 12;
                        sectorSize   = 4;
                        sectorSkip   = 2336;

                        break;
                    }

                    case SectorTagType.CdSectorSubHeader:
                    {
                        sectorOffset = 16;
                        sectorSize   = 8;
                        sectorSkip   = 2328;

                        break;
                    }

                    case SectorTagType.CdSectorEcc:
                    {
                        sectorOffset = 2076;
                        sectorSize   = 276;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorEccP:
                    {
                        sectorOffset = 2076;
                        sectorSize   = 172;
                        sectorSkip   = 104;

                        break;
                    }

                    case SectorTagType.CdSectorEccQ:
                    {
                        sectorOffset = 2248;
                        sectorSize   = 104;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorEdc:
                    {
                        sectorOffset = 2072;
                        sectorSize   = 4;
                        sectorSkip   = 276;

                        break;
                    }

                    case SectorTagType.CdSectorSubchannel:
                    {
                        switch(alcTrack.subMode)
                        {
                            case SubchannelMode.Interleaved:

                                sectorOffset = 2352;
                                sectorSize   = 96;
                                sectorSkip   = 0;

                                break;
                            default: return ErrorNumber.NotSupported;
                        }

                        break;
                    }

                    default: return ErrorNumber.NotSupported;
                }

                break;
            case TrackMode.Mode2F2:
            case TrackMode.Mode2F2Alt:
                switch(tag)
                {
                    case SectorTagType.CdSectorSync:
                    {
                        sectorOffset = 0;
                        sectorSize   = 12;
                        sectorSkip   = 2340;

                        break;
                    }

                    case SectorTagType.CdSectorHeader:
                    {
                        sectorOffset = 12;
                        sectorSize   = 4;
                        sectorSkip   = 2336;

                        break;
                    }

                    case SectorTagType.CdSectorSubHeader:
                    {
                        sectorOffset = 16;
                        sectorSize   = 8;
                        sectorSkip   = 2328;

                        break;
                    }

                    case SectorTagType.CdSectorEdc:
                    {
                        sectorOffset = 2348;
                        sectorSize   = 4;
                        sectorSkip   = 0;

                        break;
                    }

                    case SectorTagType.CdSectorSubchannel:
                    {
                        switch(alcTrack.subMode)
                        {
                            case SubchannelMode.Interleaved:

                                sectorOffset = 2352;
                                sectorSize   = 96;
                                sectorSkip   = 0;

                                break;
                            default: return ErrorNumber.NotSupported;
                        }

                        break;
                    }

                    default: return ErrorNumber.NotSupported;
                }

                break;
            case TrackMode.Audio:
            case TrackMode.AudioAlt:
            {
                switch(tag)
                {
                    case SectorTagType.CdSectorSubchannel:
                    {
                        switch(alcTrack.subMode)
                        {
                            case SubchannelMode.Interleaved:

                                sectorOffset = 2352;
                                sectorSize   = 96;
                                sectorSkip   = 0;

                                break;
                            default: return ErrorNumber.NotSupported;
                        }

                        break;
                    }

                    default: return ErrorNumber.NotSupported;
                }

                break;
            }

            default: return ErrorNumber.NotSupported;
        }

        switch(alcTrack.subMode)
        {
            case SubchannelMode.None:
                sectorSkip += 0;

                break;
            case SubchannelMode.Interleaved:
                if(tag != SectorTagType.CdSectorSubchannel)
                    sectorSkip += 96;

                break;
            default: return ErrorNumber.NotSupported;
        }

        buffer = new byte[sectorSize * length];

        if(alcTrack.point  == 1 &&
           alcExtra.pregap > 150)
        {
            if(sectorAddress + 150 < alcExtra.pregap)
                return ErrorNumber.NoError;

            sectorAddress -= alcExtra.pregap - 150;
        }

        uint pregapBytes = alcExtra.pregap * (sectorOffset + sectorSize + sectorSkip);
        var  fileOffset  = (long)alcTrack.startOffset;

        if(alcTrack.startOffset >= pregapBytes)
            fileOffset = (long)(alcTrack.startOffset - pregapBytes);

        _imageStream = _alcImage.GetDataForkStream();
        var br = new BinaryReader(_imageStream);

        br.BaseStream.Seek(fileOffset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip)),
                           SeekOrigin.Begin);

        if(sectorOffset == 0 &&
           sectorSkip   == 0)
            buffer = br.ReadBytes((int)(sectorSize * length));
        else
            for(var i = 0; i < length; i++)
            {
                br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
                byte[] sector = br.ReadBytes((int)sectorSize);
                br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
                Array.Copy(sector, 0, buffer, i * sectorSize, sectorSize);
            }

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public ErrorNumber ReadSectorLong(ulong sectorAddress, out byte[] buffer) =>
        ReadSectorsLong(sectorAddress, 1, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSectorLong(ulong sectorAddress, uint track, out byte[] buffer) =>
        ReadSectorsLong(sectorAddress, 1, track, out buffer);

    /// <inheritdoc />
    public ErrorNumber ReadSectorsLong(ulong sectorAddress, uint length, out byte[] buffer)
    {
        buffer = null;

        foreach(KeyValuePair<uint, ulong> kvp in _offsetMap)
            if(sectorAddress >= kvp.Value)
                foreach(Track alcTrack in _alcTracks.Values)
                {
                    if(alcTrack.point != kvp.Key ||
                       !_alcTrackExtras.TryGetValue(alcTrack.point, out TrackExtra alcExtra))
                        continue;

                    if(sectorAddress - kvp.Value >= alcExtra.sectors + alcExtra.pregap)
                        continue;

                    return ReadSectorsLong(sectorAddress - kvp.Value, length, kvp.Key, out buffer);
                }

        return ErrorNumber.SectorNotFound;
    }

    /// <inheritdoc />
    public ErrorNumber ReadSectorsLong(ulong sectorAddress, uint length, uint track, out byte[] buffer)
    {
        buffer = null;

        if(!_alcTracks.TryGetValue((int)track, out Track alcTrack) ||
           !_alcTrackExtras.TryGetValue((int)track, out TrackExtra alcExtra))
            return ErrorNumber.SectorNotFound;

        if(length + sectorAddress > alcExtra.sectors + alcExtra.pregap)
            return ErrorNumber.OutOfRange;

        uint sectorOffset;
        uint sectorSize;
        uint sectorSkip;

        switch(alcTrack.mode)
        {
            case TrackMode.Mode1:
            case TrackMode.Mode1Alt:
            case TrackMode.Mode2:
            case TrackMode.Mode2F1:
            case TrackMode.Mode2F1Alt:
            case TrackMode.Mode2F2:
            case TrackMode.Mode2F2Alt:
            case TrackMode.Audio:
            case TrackMode.AudioAlt:
            case TrackMode.DVD:
            {
                sectorOffset = 0;
                sectorSize   = alcTrack.sectorSize;
                sectorSkip   = 0;

                break;
            }

            default: return ErrorNumber.NotSupported;
        }

        if(alcTrack.subMode == SubchannelMode.Interleaved)
            sectorSkip = 96;

        buffer = new byte[sectorSize * length];

        if(alcTrack.point  == 1 &&
           alcExtra.pregap > 150)
        {
            if(sectorAddress + 150 < alcExtra.pregap)
                return ErrorNumber.NoError;

            sectorAddress -= alcExtra.pregap - 150;
        }

        uint pregapBytes = alcExtra.pregap * (sectorSize + sectorSkip);
        var  fileOffset  = (long)alcTrack.startOffset;

        if(alcTrack.startOffset >= pregapBytes)
            fileOffset = (long)(alcTrack.startOffset - pregapBytes);

        _imageStream = _alcImage.GetDataForkStream();
        var br = new BinaryReader(_imageStream);

        br.BaseStream.Seek(fileOffset + (long)(sectorAddress * (sectorSize + sectorSkip)),
                           SeekOrigin.Begin);

        if(sectorSkip == 0)
            buffer = br.ReadBytes((int)(sectorSize * length));
        else
            for(var i = 0; i < length; i++)
            {
                br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
                byte[] sector = br.ReadBytes((int)sectorSize);
                br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);

                Array.Copy(sector, 0, buffer, i * sectorSize, sectorSize);
            }

        return ErrorNumber.NoError;
    }

    /// <inheritdoc />
    public List<CommonTypes.Structs.Track> GetSessionTracks(CommonTypes.Structs.Session session) =>
        Sessions.Contains(session) ? GetSessionTracks(session.Sequence) : null;

    /// <inheritdoc />
    public List<CommonTypes.Structs.Track> GetSessionTracks(ushort session)
    {
        List<CommonTypes.Structs.Track> tracks = new();

        foreach(Track alcTrack in _alcTracks.Values)
        {
            ushort sessionNo =
                (from ses in Sessions where alcTrack.point >= ses.StartTrack || alcTrack.point <= ses.EndTrack
                 select ses.Sequence).FirstOrDefault();

            if(!_alcTrackExtras.TryGetValue(alcTrack.point, out TrackExtra alcExtra) ||
               session != sessionNo)
                continue;

            var aaruTrack = new CommonTypes.Structs.Track
            {
                StartSector       = alcTrack.startLba,
                EndSector         = alcExtra.sectors - 1,
                Pregap            = alcExtra.pregap,
                Session           = sessionNo,
                Sequence          = alcTrack.point,
                Type              = TrackModeToTrackType(alcTrack.mode),
                Filter            = _alcImage,
                File              = _alcImage.Filename,
                FileOffset        = alcTrack.startOffset,
                FileType          = "BINARY",
                RawBytesPerSector = alcTrack.sectorSize,
                BytesPerSector    = TrackModeToCookedBytesPerSector(alcTrack.mode)
            };

            if(alcExtra.pregap > 0)
                aaruTrack.Indexes.Add(0, (int)(alcTrack.startLba - alcExtra.pregap));

            aaruTrack.Indexes.Add(1, (int)alcTrack.startLba);

            switch(alcTrack.subMode)
            {
                case SubchannelMode.Interleaved:
                    aaruTrack.SubchannelFilter = _alcImage;
                    aaruTrack.SubchannelFile   = _alcImage.Filename;
                    aaruTrack.SubchannelOffset = alcTrack.startOffset;
                    aaruTrack.SubchannelType   = TrackSubchannelType.RawInterleaved;

                    break;
                case SubchannelMode.None:
                    aaruTrack.SubchannelType = TrackSubchannelType.None;

                    break;
            }

            tracks.Add(aaruTrack);
        }

        return tracks;
    }
}