Ejemplo n.º 1
0
        public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
                           Dictionary <string, string> options, string @namespace)
        {
            Encoding = encoding ?? Encoding.GetEncoding(1252);
            byte[] vdMagic = new byte[5]; // Volume Descriptor magic "CD001"
            byte[] hsMagic = new byte[5]; // Volume Descriptor magic "CDROM"

            options ??= GetDefaultOptions();

            if (options.TryGetValue("debug", out string debugString))
            {
                bool.TryParse(debugString, out _debug);
            }

            if (options.TryGetValue("use_path_table", out string usePathTableString))
            {
                bool.TryParse(usePathTableString, out _usePathTable);
            }

            if (options.TryGetValue("use_trans_tbl", out string useTransTblString))
            {
                bool.TryParse(useTransTblString, out _useTransTbl);
            }

            if (options.TryGetValue("use_evd", out string useEvdString))
            {
                bool.TryParse(useEvdString, out _useEvd);
            }

            // Default namespace
            @namespace ??= "joliet";

            switch (@namespace.ToLowerInvariant())
            {
            case "normal":
                _namespace = Namespace.Normal;

                break;

            case "vms":
                _namespace = Namespace.Vms;

                break;

            case "joliet":
                _namespace = Namespace.Joliet;

                break;

            case "rrip":
                _namespace = Namespace.Rrip;

                break;

            case "romeo":
                _namespace = Namespace.Romeo;

                break;

            default: return(Errno.InvalidArgument);
            }

            PrimaryVolumeDescriptor?pvd      = null;
            PrimaryVolumeDescriptor?jolietvd = null;
            BootRecord?bvd = null;
            HighSierraPrimaryVolumeDescriptor?hsvd = null;
            FileStructureVolumeDescriptor?    fsvd = null;

            // ISO9660 is designed for 2048 bytes/sector devices
            if (imagePlugin.Info.SectorSize < 2048)
            {
                return(Errno.InvalidArgument);
            }

            // ISO9660 Primary Volume Descriptor starts at sector 16, so that's minimal size.
            if (partition.End < 16)
            {
                return(Errno.InvalidArgument);
            }

            ulong counter = 0;

            byte[] vdSector = imagePlugin.ReadSector(16 + counter + partition.Start);
            int    xaOff    = vdSector.Length == 2336 ? 8 : 0;

            Array.Copy(vdSector, 0x009 + xaOff, hsMagic, 0, 5);
            _highSierra = Encoding.GetString(hsMagic) == HIGH_SIERRA_MAGIC;
            int hsOff = 0;

            if (_highSierra)
            {
                hsOff = 8;
            }

            _cdi = false;
            List <ulong> bvdSectors = new List <ulong>();
            List <ulong> pvdSectors = new List <ulong>();
            List <ulong> svdSectors = new List <ulong>();
            List <ulong> evdSectors = new List <ulong>();
            List <ulong> vpdSectors = new List <ulong>();

            while (true)
            {
                AaruConsole.DebugWriteLine("ISO9660 plugin", "Processing VD loop no. {0}", counter);

                // Seek to Volume Descriptor
                AaruConsole.DebugWriteLine("ISO9660 plugin", "Reading sector {0}", 16 + counter + partition.Start);
                byte[] vdSectorTmp = imagePlugin.ReadSector(16 + counter + partition.Start);
                vdSector = new byte[vdSectorTmp.Length - xaOff];
                Array.Copy(vdSectorTmp, xaOff, vdSector, 0, vdSector.Length);

                byte vdType = vdSector[0 + hsOff]; // Volume Descriptor Type, should be 1 or 2.
                AaruConsole.DebugWriteLine("ISO9660 plugin", "VDType = {0}", vdType);

                if (vdType == 255) // Supposedly we are in the PVD.
                {
                    if (counter == 0)
                    {
                        return(Errno.InvalidArgument);
                    }

                    break;
                }

                Array.Copy(vdSector, 0x001, vdMagic, 0, 5);
                Array.Copy(vdSector, 0x009, hsMagic, 0, 5);

                if (Encoding.GetString(vdMagic) != ISO_MAGIC &&
                    Encoding.GetString(hsMagic) != HIGH_SIERRA_MAGIC &&
                    Encoding.GetString(vdMagic) != CDI_MAGIC
                    ) // Recognized, it is an ISO9660, now check for rest of data.
                {
                    if (counter == 0)
                    {
                        return(Errno.InvalidArgument);
                    }

                    break;
                }

                _cdi |= Encoding.GetString(vdMagic) == CDI_MAGIC;

                switch (vdType)
                {
                case 0:
                {
                    if (_debug)
                    {
                        bvdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }

                case 1:
                {
                    if (_highSierra)
                    {
                        hsvd = Marshal.
                               ByteArrayToStructureLittleEndian <HighSierraPrimaryVolumeDescriptor>(vdSector);
                    }
                    else if (_cdi)
                    {
                        fsvd = Marshal.ByteArrayToStructureBigEndian <FileStructureVolumeDescriptor>(vdSector);
                    }
                    else
                    {
                        pvd = Marshal.ByteArrayToStructureLittleEndian <PrimaryVolumeDescriptor>(vdSector);
                    }

                    if (_debug)
                    {
                        pvdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }

                case 2:
                {
                    PrimaryVolumeDescriptor svd =
                        Marshal.ByteArrayToStructureLittleEndian <PrimaryVolumeDescriptor>(vdSector);

                    // TODO: Other escape sequences
                    // Check if this is Joliet
                    if (svd.version == 1)
                    {
                        if (svd.escape_sequences[0] == '%' &&
                            svd.escape_sequences[1] == '/')
                        {
                            if (svd.escape_sequences[2] == '@' ||
                                svd.escape_sequences[2] == 'C' ||
                                svd.escape_sequences[2] == 'E')
                            {
                                jolietvd = svd;
                            }
                            else
                            {
                                AaruConsole.DebugWriteLine("ISO9660 plugin",
                                                           "Found unknown supplementary volume descriptor");
                            }
                        }

                        if (_debug)
                        {
                            svdSectors.Add(16 + counter + partition.Start);
                        }
                    }
                    else
                    {
                        if (_debug)
                        {
                            evdSectors.Add(16 + counter + partition.Start);
                        }

                        if (_useEvd)
                        {
                            // Basically until escape sequences are implemented, let the user chose the encoding.
                            // This is the same as user choosing Romeo namespace, but using the EVD instead of the PVD
                            _namespace = Namespace.Romeo;
                            pvd        = svd;
                        }
                    }

                    break;
                }

                case 3:
                {
                    if (_debug)
                    {
                        vpdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }
                }

                counter++;
            }

            DecodedVolumeDescriptor decodedVd;
            var decodedJolietVd = new DecodedVolumeDescriptor();

            XmlFsType = new FileSystemType();

            if (pvd == null &&
                hsvd == null &&
                fsvd == null)
            {
                AaruConsole.ErrorWriteLine("ERROR: Could not find primary volume descriptor");

                return(Errno.InvalidArgument);
            }

            if (_highSierra)
            {
                decodedVd = DecodeVolumeDescriptor(hsvd.Value);
            }
            else if (_cdi)
            {
                decodedVd = DecodeVolumeDescriptor(fsvd.Value);
            }
            else
            {
                decodedVd = DecodeVolumeDescriptor(pvd.Value);
            }

            if (jolietvd != null)
            {
                decodedJolietVd = DecodeJolietDescriptor(jolietvd.Value);
            }

            if (_namespace != Namespace.Romeo)
            {
                Encoding = Encoding.ASCII;
            }

            string fsFormat;

            byte[] pathTableData;

            uint pathTableMsbLocation;
            uint pathTableLsbLocation = 0; // Initialize to 0 as ignored in CD-i

            _image = imagePlugin;

            if (_highSierra)
            {
                pathTableData = ReadSingleExtent(0, hsvd.Value.path_table_size,
                                                 Swapping.Swap(hsvd.Value.mandatory_path_table_msb));

                fsFormat = "High Sierra Format";

                pathTableMsbLocation = hsvd.Value.mandatory_path_table_msb;
                pathTableLsbLocation = hsvd.Value.mandatory_path_table_lsb;
            }
            else if (_cdi)
            {
                pathTableData = ReadSingleExtent(0, fsvd.Value.path_table_size, fsvd.Value.path_table_addr);

                fsFormat = "CD-i";

                pathTableMsbLocation = fsvd.Value.path_table_addr;

                // TODO: Until escape sequences are implemented this is the default CD-i encoding.
                Encoding = Encoding.GetEncoding("iso8859-1");
            }
            else
            {
                pathTableData =
                    ReadSingleExtent(0, pvd.Value.path_table_size, Swapping.Swap(pvd.Value.type_m_path_table));

                fsFormat = "ISO9660";

                pathTableMsbLocation = pvd.Value.type_m_path_table;
                pathTableLsbLocation = pvd.Value.type_l_path_table;
            }

            _pathTable = _highSierra ? DecodeHighSierraPathTable(pathTableData) : DecodePathTable(pathTableData);

            // High Sierra and CD-i do not support Joliet or RRIP
            if ((_highSierra || _cdi) &&
                _namespace != Namespace.Normal &&
                _namespace != Namespace.Vms)
            {
                _namespace = Namespace.Normal;
            }

            if (jolietvd is null &&
                _namespace == Namespace.Joliet)
            {
                _namespace = Namespace.Normal;
            }

            uint rootLocation;
            uint rootSize;
            byte rootXattrLength = 0;

            if (!_cdi)
            {
                rootLocation = _highSierra ? hsvd.Value.root_directory_record.extent
                                   : pvd.Value.root_directory_record.extent;

                rootXattrLength = _highSierra ? hsvd.Value.root_directory_record.xattr_len
                                      : pvd.Value.root_directory_record.xattr_len;

                rootSize = _highSierra ? hsvd.Value.root_directory_record.size : pvd.Value.root_directory_record.size;

                if (pathTableData.Length > 1 &&
                    rootLocation != _pathTable[0].Extent)
                {
                    AaruConsole.DebugWriteLine("ISO9660 plugin",
                                               "Path table and PVD do not point to the same location for the root directory!");

                    byte[] firstRootSector = ReadSector(rootLocation);

                    bool pvdWrongRoot = false;

                    if (_highSierra)
                    {
                        HighSierraDirectoryRecord rootEntry =
                            Marshal.ByteArrayToStructureLittleEndian <HighSierraDirectoryRecord>(firstRootSector);

                        if (rootEntry.extent != rootLocation)
                        {
                            pvdWrongRoot = true;
                        }
                    }
                    else
                    {
                        DirectoryRecord rootEntry =
                            Marshal.ByteArrayToStructureLittleEndian <DirectoryRecord>(firstRootSector);

                        if (rootEntry.extent != rootLocation)
                        {
                            pvdWrongRoot = true;
                        }
                    }

                    if (pvdWrongRoot)
                    {
                        AaruConsole.DebugWriteLine("ISO9660 plugin",
                                                   "PVD does not point to correct root directory, checking path table...");

                        bool pathTableWrongRoot = false;

                        rootLocation = _pathTable[0].Extent;

                        firstRootSector = ReadSector(_pathTable[0].Extent);

                        if (_highSierra)
                        {
                            HighSierraDirectoryRecord rootEntry =
                                Marshal.ByteArrayToStructureLittleEndian <HighSierraDirectoryRecord>(firstRootSector);

                            if (rootEntry.extent != rootLocation)
                            {
                                pathTableWrongRoot = true;
                            }
                        }
                        else
                        {
                            DirectoryRecord rootEntry =
                                Marshal.ByteArrayToStructureLittleEndian <DirectoryRecord>(firstRootSector);

                            if (rootEntry.extent != rootLocation)
                            {
                                pathTableWrongRoot = true;
                            }
                        }

                        if (pathTableWrongRoot)
                        {
                            AaruConsole.ErrorWriteLine("Cannot find root directory...");

                            return(Errno.InvalidArgument);
                        }

                        _usePathTable = true;
                    }
                }
            }
            else
            {
                rootLocation = _pathTable[0].Extent;

                byte[] firstRootSector = ReadSector(rootLocation);

                CdiDirectoryRecord rootEntry =
                    Marshal.ByteArrayToStructureBigEndian <CdiDirectoryRecord>(firstRootSector);

                rootSize = rootEntry.size;

                _usePathTable = _usePathTable || _pathTable.Length == 1;
                _useTransTbl  = false;
            }

            // In case the path table is incomplete
            if (_usePathTable && pathTableData.Length == 1)
            {
                _usePathTable = false;
            }

            if (_usePathTable && !_cdi)
            {
                rootLocation = _pathTable[0].Extent;

                byte[] firstRootSector = ReadSector(rootLocation);

                if (_highSierra)
                {
                    HighSierraDirectoryRecord rootEntry =
                        Marshal.ByteArrayToStructureLittleEndian <HighSierraDirectoryRecord>(firstRootSector);

                    rootSize = rootEntry.size;
                }
                else
                {
                    DirectoryRecord rootEntry =
                        Marshal.ByteArrayToStructureLittleEndian <DirectoryRecord>(firstRootSector);

                    rootSize = rootEntry.size;
                }

                rootXattrLength = _pathTable[0].XattrLength;
            }

            try
            {
                _ = ReadSingleExtent(0, rootSize, rootLocation);
            }
            catch
            {
                return(Errno.InvalidArgument);
            }

            byte[]          ipbinSector = ReadSector(partition.Start);
            CD.IPBin?       segaCd      = CD.DecodeIPBin(ipbinSector);
            Saturn.IPBin?   saturn      = Saturn.DecodeIPBin(ipbinSector);
            Dreamcast.IPBin?dreamcast   = Dreamcast.DecodeIPBin(ipbinSector);

            if (_namespace == Namespace.Joliet ||
                _namespace == Namespace.Rrip)
            {
                _usePathTable = false;
                _useTransTbl  = false;
            }

            // Cannot traverse path table if we substitute the names for the ones in TRANS.TBL
            if (_useTransTbl)
            {
                _usePathTable = false;
            }

            if (_namespace != Namespace.Joliet)
            {
                _rootDirectoryCache = _cdi
                                          ? DecodeCdiDirectory(rootLocation, rootSize, rootXattrLength)
                                          : _highSierra
                                              ? DecodeHighSierraDirectory(rootLocation, rootSize, rootXattrLength)
                                              : DecodeIsoDirectory(rootLocation, rootSize, rootXattrLength);
            }

            XmlFsType.Type = fsFormat;

            if (jolietvd != null &&
                (_namespace == Namespace.Joliet || _namespace == Namespace.Rrip))
            {
                rootLocation    = jolietvd.Value.root_directory_record.extent;
                rootXattrLength = jolietvd.Value.root_directory_record.xattr_len;

                rootSize = jolietvd.Value.root_directory_record.size;

                _joliet = true;

                _rootDirectoryCache = DecodeIsoDirectory(rootLocation, rootSize, rootXattrLength);

                XmlFsType.VolumeName = decodedJolietVd.VolumeIdentifier;

                if (string.IsNullOrEmpty(decodedJolietVd.SystemIdentifier) ||
                    decodedVd.SystemIdentifier.Length > decodedJolietVd.SystemIdentifier.Length)
                {
                    XmlFsType.SystemIdentifier = decodedVd.SystemIdentifier;
                }
                else
                {
                    XmlFsType.SystemIdentifier = string.IsNullOrEmpty(decodedJolietVd.SystemIdentifier) ? null
                                                     : decodedJolietVd.SystemIdentifier;
                }

                if (string.IsNullOrEmpty(decodedJolietVd.VolumeSetIdentifier) ||
                    decodedVd.VolumeSetIdentifier.Length > decodedJolietVd.VolumeSetIdentifier.Length)
                {
                    XmlFsType.VolumeSetIdentifier = decodedVd.VolumeSetIdentifier;
                }
                else
                {
                    XmlFsType.VolumeSetIdentifier = string.IsNullOrEmpty(decodedJolietVd.VolumeSetIdentifier) ? null
                                                        : decodedJolietVd.VolumeSetIdentifier;
                }

                if (string.IsNullOrEmpty(decodedJolietVd.PublisherIdentifier) ||
                    decodedVd.PublisherIdentifier.Length > decodedJolietVd.PublisherIdentifier.Length)
                {
                    XmlFsType.PublisherIdentifier = decodedVd.PublisherIdentifier;
                }
                else
                {
                    XmlFsType.PublisherIdentifier = string.IsNullOrEmpty(decodedJolietVd.PublisherIdentifier) ? null
                                                        : decodedJolietVd.PublisherIdentifier;
                }

                if (string.IsNullOrEmpty(decodedJolietVd.DataPreparerIdentifier) ||
                    decodedVd.DataPreparerIdentifier.Length > decodedJolietVd.DataPreparerIdentifier.Length)
                {
                    XmlFsType.DataPreparerIdentifier = decodedVd.DataPreparerIdentifier;
                }
                else
                {
                    XmlFsType.DataPreparerIdentifier = string.IsNullOrEmpty(decodedJolietVd.DataPreparerIdentifier)
                                                           ? null : decodedJolietVd.DataPreparerIdentifier;
                }

                if (string.IsNullOrEmpty(decodedJolietVd.ApplicationIdentifier) ||
                    decodedVd.ApplicationIdentifier.Length > decodedJolietVd.ApplicationIdentifier.Length)
                {
                    XmlFsType.ApplicationIdentifier = decodedVd.ApplicationIdentifier;
                }
                else
                {
                    XmlFsType.ApplicationIdentifier = string.IsNullOrEmpty(decodedJolietVd.ApplicationIdentifier) ? null
                                                          : decodedJolietVd.ApplicationIdentifier;
                }

                XmlFsType.CreationDate          = decodedJolietVd.CreationTime;
                XmlFsType.CreationDateSpecified = true;

                if (decodedJolietVd.HasModificationTime)
                {
                    XmlFsType.ModificationDate          = decodedJolietVd.ModificationTime;
                    XmlFsType.ModificationDateSpecified = true;
                }

                if (decodedJolietVd.HasExpirationTime)
                {
                    XmlFsType.ExpirationDate          = decodedJolietVd.ExpirationTime;
                    XmlFsType.ExpirationDateSpecified = true;
                }

                if (decodedJolietVd.HasEffectiveTime)
                {
                    XmlFsType.EffectiveDate          = decodedJolietVd.EffectiveTime;
                    XmlFsType.EffectiveDateSpecified = true;
                }

                decodedVd = decodedJolietVd;
            }
            else
            {
                XmlFsType.SystemIdentifier       = decodedVd.SystemIdentifier;
                XmlFsType.VolumeName             = decodedVd.VolumeIdentifier;
                XmlFsType.VolumeSetIdentifier    = decodedVd.VolumeSetIdentifier;
                XmlFsType.PublisherIdentifier    = decodedVd.PublisherIdentifier;
                XmlFsType.DataPreparerIdentifier = decodedVd.DataPreparerIdentifier;
                XmlFsType.ApplicationIdentifier  = decodedVd.ApplicationIdentifier;
                XmlFsType.CreationDate           = decodedVd.CreationTime;
                XmlFsType.CreationDateSpecified  = true;

                if (decodedVd.HasModificationTime)
                {
                    XmlFsType.ModificationDate          = decodedVd.ModificationTime;
                    XmlFsType.ModificationDateSpecified = true;
                }

                if (decodedVd.HasExpirationTime)
                {
                    XmlFsType.ExpirationDate          = decodedVd.ExpirationTime;
                    XmlFsType.ExpirationDateSpecified = true;
                }

                if (decodedVd.HasEffectiveTime)
                {
                    XmlFsType.EffectiveDate          = decodedVd.EffectiveTime;
                    XmlFsType.EffectiveDateSpecified = true;
                }
            }

            if (_debug)
            {
                _rootDirectoryCache.Add("$", new DecodedDirectoryEntry
                {
                    Extents = new List <(uint extent, uint size)>
                    {
                        (rootLocation, rootSize)
                    },
                    Filename  = "$",
                    Size      = rootSize,
                    Timestamp = decodedVd.CreationTime
                });
Ejemplo n.º 2
0
        public static void DetectDiscType(ref MediaType mediaType, int sessions, FullTOC.CDFullTOC?decodedToc,
                                          Device dev, out bool hiddenTrack, out bool hiddenData,
                                          int firstTrackLastSession)
        {
            uint startOfFirstDataTrack = uint.MaxValue;

            byte[] cmdBuf;
            bool   sense;
            byte   secondSessionFirstTrack = 0;

            byte[] sector0;
            byte[] sector1                      = null;
            byte[] ps2BootSectors               = null;
            byte[] playdia1                     = null;
            byte[] playdia2                     = null;
            byte[] firstDataSectorNotZero       = null;
            byte[] secondDataSectorNotZero      = null;
            byte[] firstTrackSecondSession      = null;
            byte[] firstTrackSecondSessionAudio = null;
            byte[] videoNowColorFrame;
            hiddenTrack = false;
            hiddenData  = false;

            if (decodedToc.HasValue)
            {
                if (decodedToc.Value.TrackDescriptors.Any(t => t.SessionNumber == 2))
                {
                    secondSessionFirstTrack =
                        decodedToc.Value.TrackDescriptors.Where(t => t.SessionNumber == 2).Min(t => t.POINT);
                }
            }

            if (mediaType == MediaType.CD ||
                mediaType == MediaType.CDROMXA)
            {
                bool hasDataTrack  = false;
                bool hasAudioTrack = false;
                bool allFirstSessionTracksAreAudio = true;
                bool hasVideoTrack = false;

                if (decodedToc.HasValue)
                {
                    foreach (FullTOC.TrackDataDescriptor track in decodedToc.Value.TrackDescriptors)
                    {
                        if (track.TNO == 1 &&
                            ((TocControl)(track.CONTROL & 0x0D) == TocControl.DataTrack ||
                             (TocControl)(track.CONTROL & 0x0D) == TocControl.DataTrackIncremental))
                        {
                            allFirstSessionTracksAreAudio &= firstTrackLastSession != 1;
                        }

                        if ((TocControl)(track.CONTROL & 0x0D) == TocControl.DataTrack ||
                            (TocControl)(track.CONTROL & 0x0D) == TocControl.DataTrackIncremental)
                        {
                            uint startAddress =
                                (uint)(((track.PHOUR * 3600 * 75) + (track.PMIN * 60 * 75) + (track.PSEC * 75) +
                                        track.PFRAME) - 150);

                            if (startAddress < startOfFirstDataTrack)
                            {
                                startOfFirstDataTrack = startAddress;
                            }

                            hasDataTrack = true;
                            allFirstSessionTracksAreAudio &= track.POINT >= firstTrackLastSession;
                        }
                        else
                        {
                            hasAudioTrack = true;
                        }

                        hasVideoTrack |= track.ADR == 4;
                    }
                }

                if (hasDataTrack &&
                    hasAudioTrack &&
                    allFirstSessionTracksAreAudio &&
                    sessions == 2)
                {
                    mediaType = MediaType.CDPLUS;
                }

                if (!hasDataTrack &&
                    hasAudioTrack &&
                    sessions == 1)
                {
                    mediaType = MediaType.CDDA;
                }

                if (hasDataTrack &&
                    !hasAudioTrack &&
                    sessions == 1)
                {
                    mediaType = MediaType.CDROM;
                }

                if (hasVideoTrack &&
                    !hasDataTrack &&
                    sessions == 1)
                {
                    mediaType = MediaType.CDV;
                }
            }

            if (secondSessionFirstTrack != 0 &&
                decodedToc.HasValue &&
                decodedToc.Value.TrackDescriptors.Any(t => t.POINT == secondSessionFirstTrack))
            {
                FullTOC.TrackDataDescriptor secondSessionFirstTrackTrack =
                    decodedToc.Value.TrackDescriptors.First(t => t.POINT == secondSessionFirstTrack);

                uint firstSectorSecondSessionFirstTrack =
                    (uint)(((secondSessionFirstTrackTrack.PHOUR * 3600 * 75) +
                            (secondSessionFirstTrackTrack.PMIN * 60 * 75) +
                            (secondSessionFirstTrackTrack.PSEC * 75) +
                            secondSessionFirstTrackTrack.PFRAME) - 150);

                sense = dev.ReadCd(out cmdBuf, out _, firstSectorSecondSessionFirstTrack, 2352, 1,
                                   MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders, true, true,
                                   MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                if (!sense &&
                    !dev.Error)
                {
                    firstTrackSecondSession = cmdBuf;
                }
                else
                {
                    sense = dev.ReadCd(out cmdBuf, out _, firstSectorSecondSessionFirstTrack, 2352, 1,
                                       MmcSectorTypes.Cdda, false, false, true, MmcHeaderCodes.None, true, true,
                                       MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        firstTrackSecondSession = cmdBuf;
                    }
                }

                sense = dev.ReadCd(out cmdBuf, out _, firstSectorSecondSessionFirstTrack - 1, 2352, 3,
                                   MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders, true, true,
                                   MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                if (!sense &&
                    !dev.Error)
                {
                    firstTrackSecondSessionAudio = cmdBuf;
                }
                else
                {
                    sense = dev.ReadCd(out cmdBuf, out _, firstSectorSecondSessionFirstTrack - 1, 2352, 3,
                                       MmcSectorTypes.Cdda, false, false, true, MmcHeaderCodes.None, true, true,
                                       MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        firstTrackSecondSessionAudio = cmdBuf;
                    }
                }
            }

            videoNowColorFrame = new byte[9 * 2352];

            for (int i = 0; i < 9; i++)
            {
                sense = dev.ReadCd(out cmdBuf, out _, (uint)i, 2352, 1, MmcSectorTypes.AllTypes, false, false, true,
                                   MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None, MmcSubchannel.None,
                                   dev.Timeout, out _);

                if (sense || dev.Error)
                {
                    sense = dev.ReadCd(out cmdBuf, out _, (uint)i, 2352, 1, MmcSectorTypes.Cdda, false, false, true,
                                       MmcHeaderCodes.None, true, true, MmcErrorField.None, MmcSubchannel.None,
                                       dev.Timeout, out _);

                    if (sense || !dev.Error)
                    {
                        videoNowColorFrame = null;

                        break;
                    }
                }

                Array.Copy(cmdBuf, 0, videoNowColorFrame, i * 2352, 2352);
            }

            if (decodedToc.HasValue)
            {
                FullTOC.TrackDataDescriptor firstTrack =
                    decodedToc.Value.TrackDescriptors.FirstOrDefault(t => t.POINT == 1);

                if (firstTrack.POINT == 1)
                {
                    uint firstTrackSector = (uint)(((firstTrack.PHOUR * 3600 * 75) + (firstTrack.PMIN * 60 * 75) +
                                                    (firstTrack.PSEC * 75) + firstTrack.PFRAME) - 150);

                    // Check for hidden data before start of track 1
                    if (firstTrackSector > 0)
                    {
                        sense = dev.ReadCd(out sector0, out _, 0, 2352, 1, MmcSectorTypes.AllTypes, false, false, true,
                                           MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                           MmcSubchannel.None, dev.Timeout, out _);

                        if (!dev.Error &&
                            !sense)
                        {
                            hiddenTrack = true;

                            hiddenData = IsData(sector0);

                            if (hiddenData)
                            {
                                sense = dev.ReadCd(out byte[] sector16, out _, 16, 2352, 1, MmcSectorTypes.AllTypes,
                                                   false, false, true, MmcHeaderCodes.AllHeaders, true, true,
                                                   MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                                if (IsCdi(sector0, sector16))
                                {
                                    mediaType = MediaType.CDIREADY;
                                }
                            }
                        }
                    }
                }
            }

            sector0 = null;

            switch (mediaType)
            {
            case MediaType.CD:
            case MediaType.CDDA:
            case MediaType.CDPLUS:
            case MediaType.CDROM:
            case MediaType.CDROMXA:
            {
                sense = dev.ReadCd(out cmdBuf, out _, 0, 2352, 1, MmcSectorTypes.AllTypes, false, false, true,
                                   MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None, MmcSubchannel.None,
                                   dev.Timeout, out _);

                if (!sense &&
                    !dev.Error)
                {
                    sector0 = new byte[2048];
                    Array.Copy(cmdBuf, 16, sector0, 0, 2048);

                    sense = dev.ReadCd(out cmdBuf, out _, 1, 2352, 1, MmcSectorTypes.AllTypes, false, false, true,
                                       MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                       MmcSubchannel.None, dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        sector1 = new byte[2048];
                        Array.Copy(cmdBuf, 16, sector1, 0, 2048);
                    }

                    sense = dev.ReadCd(out cmdBuf, out _, 4200, 2352, 1, MmcSectorTypes.AllTypes, false, false,
                                       true, MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                       MmcSubchannel.None, dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        playdia1 = new byte[2048];
                        Array.Copy(cmdBuf, 24, playdia1, 0, 2048);
                    }

                    sense = dev.ReadCd(out cmdBuf, out _, 4201, 2352, 1, MmcSectorTypes.AllTypes, false, false,
                                       true, MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                       MmcSubchannel.None, dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        playdia2 = new byte[2048];
                        Array.Copy(cmdBuf, 24, playdia2, 0, 2048);
                    }

                    if (startOfFirstDataTrack != uint.MaxValue)
                    {
                        sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack, 2352, 1,
                                           MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders,
                                           true, true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            firstDataSectorNotZero = new byte[2048];
                            Array.Copy(cmdBuf, 16, firstDataSectorNotZero, 0, 2048);
                        }

                        sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack + 1, 2352, 1,
                                           MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders,
                                           true, true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            secondDataSectorNotZero = new byte[2048];
                            Array.Copy(cmdBuf, 16, secondDataSectorNotZero, 0, 2048);
                        }
                    }

                    var ps2Ms = new MemoryStream();

                    for (uint p = 0; p < 12; p++)
                    {
                        sense = dev.ReadCd(out cmdBuf, out _, p, 2352, 1, MmcSectorTypes.AllTypes, false, false,
                                           true, MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                           MmcSubchannel.None, dev.Timeout, out _);

                        if (sense || dev.Error)
                        {
                            break;
                        }

                        ps2Ms.Write(cmdBuf, cmdBuf[0x0F] == 0x02 ? 24 : 16, 2048);
                    }

                    if (ps2Ms.Length == 0x6000)
                    {
                        ps2BootSectors = ps2Ms.ToArray();
                    }
                }
                else
                {
                    sense = dev.ReadCd(out cmdBuf, out _, 0, 2324, 1, MmcSectorTypes.Mode2, false, false, true,
                                       MmcHeaderCodes.None, true, true, MmcErrorField.None, MmcSubchannel.None,
                                       dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        sector0 = new byte[2048];
                        Array.Copy(cmdBuf, 0, sector0, 0, 2048);

                        sense = dev.ReadCd(out cmdBuf, out _, 1, 2324, 1, MmcSectorTypes.Mode2, false, false, true,
                                           MmcHeaderCodes.None, true, true, MmcErrorField.None, MmcSubchannel.None,
                                           dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            sector1 = new byte[2048];
                            Array.Copy(cmdBuf, 1, sector0, 0, 2048);
                        }

                        sense = dev.ReadCd(out cmdBuf, out _, 4200, 2324, 1, MmcSectorTypes.Mode2, false, false,
                                           true, MmcHeaderCodes.None, true, true, MmcErrorField.None,
                                           MmcSubchannel.None, dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            playdia1 = new byte[2048];
                            Array.Copy(cmdBuf, 0, playdia1, 0, 2048);
                        }

                        sense = dev.ReadCd(out cmdBuf, out _, 4201, 2324, 1, MmcSectorTypes.Mode2, false, false,
                                           true, MmcHeaderCodes.None, true, true, MmcErrorField.None,
                                           MmcSubchannel.None, dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            playdia2 = new byte[2048];
                            Array.Copy(cmdBuf, 0, playdia2, 0, 2048);
                        }

                        if (startOfFirstDataTrack != uint.MaxValue)
                        {
                            sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack, 2324, 1,
                                               MmcSectorTypes.Mode2, false, false, true, MmcHeaderCodes.None, true,
                                               true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                firstDataSectorNotZero = new byte[2048];
                                Array.Copy(cmdBuf, 0, firstDataSectorNotZero, 0, 2048);
                            }

                            sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack + 1, 2324, 1,
                                               MmcSectorTypes.Mode2, false, false, true, MmcHeaderCodes.None, true,
                                               true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                secondDataSectorNotZero = new byte[2048];
                                Array.Copy(cmdBuf, 0, secondDataSectorNotZero, 0, 2048);
                            }
                        }

                        var ps2Ms = new MemoryStream();

                        for (uint p = 0; p < 12; p++)
                        {
                            sense = dev.ReadCd(out cmdBuf, out _, p, 2324, 1, MmcSectorTypes.Mode2, false, false,
                                               true, MmcHeaderCodes.None, true, true, MmcErrorField.None,
                                               MmcSubchannel.None, dev.Timeout, out _);

                            if (sense || dev.Error)
                            {
                                break;
                            }

                            ps2Ms.Write(cmdBuf, 0, 2048);
                        }

                        if (ps2Ms.Length == 0x6000)
                        {
                            ps2BootSectors = ps2Ms.ToArray();
                        }
                    }
                    else
                    {
                        sense = dev.ReadCd(out cmdBuf, out _, 0, 2048, 1, MmcSectorTypes.Mode1, false, false, true,
                                           MmcHeaderCodes.None, true, true, MmcErrorField.None, MmcSubchannel.None,
                                           dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            sector0 = cmdBuf;

                            sense = dev.ReadCd(out cmdBuf, out _, 0, 2048, 1, MmcSectorTypes.Mode1, false, false,
                                               true, MmcHeaderCodes.None, true, true, MmcErrorField.None,
                                               MmcSubchannel.None, dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                sector1 = cmdBuf;
                            }

                            sense = dev.ReadCd(out cmdBuf, out _, 0, 2048, 12, MmcSectorTypes.Mode1, false, false,
                                               true, MmcHeaderCodes.None, true, true, MmcErrorField.None,
                                               MmcSubchannel.None, dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                ps2BootSectors = cmdBuf;
                            }

                            if (startOfFirstDataTrack != uint.MaxValue)
                            {
                                sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack, 2048, 1,
                                                   MmcSectorTypes.Mode1, false, false, true, MmcHeaderCodes.None,
                                                   true, true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout,
                                                   out _);

                                if (!sense &&
                                    !dev.Error)
                                {
                                    firstDataSectorNotZero = cmdBuf;
                                }

                                sense = dev.ReadCd(out cmdBuf, out _, startOfFirstDataTrack + 1, 2048, 1,
                                                   MmcSectorTypes.Mode1, false, false, true, MmcHeaderCodes.None,
                                                   true, true, MmcErrorField.None, MmcSubchannel.None, dev.Timeout,
                                                   out _);

                                if (!sense &&
                                    !dev.Error)
                                {
                                    secondDataSectorNotZero = cmdBuf;
                                }
                            }
                        }
                        else
                        {
                            goto case MediaType.DVDROM;
                        }
                    }
                }

                break;
            }

            // TODO: Check for CD-i Ready
            case MediaType.CDI: break;

            case MediaType.DVDROM:
            case MediaType.HDDVDROM:
            case MediaType.BDROM:
            case MediaType.Unknown:
                sense = dev.Read16(out cmdBuf, out _, 0, false, true, false, 0, 2048, 0, 1, false, dev.Timeout,
                                   out _);

                if (!sense &&
                    !dev.Error)
                {
                    sector0 = cmdBuf;

                    sense = dev.Read16(out cmdBuf, out _, 0, false, true, false, 1, 2048, 0, 1, false, dev.Timeout,
                                       out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        sector1 = cmdBuf;
                    }

                    sense = dev.Read16(out cmdBuf, out _, 0, false, true, false, 0, 2048, 0, 12, false, dev.Timeout,
                                       out _);

                    if (!sense &&
                        !dev.Error &&
                        cmdBuf.Length == 0x6000)
                    {
                        ps2BootSectors = cmdBuf;
                    }
                }
                else
                {
                    sense = dev.Read12(out cmdBuf, out _, 0, false, true, false, false, 0, 2048, 0, 1, false,
                                       dev.Timeout, out _);

                    if (!sense &&
                        !dev.Error)
                    {
                        sector0 = cmdBuf;

                        sense = dev.Read12(out cmdBuf, out _, 0, false, true, false, false, 1, 2048, 0, 1, false,
                                           dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            sector1 = cmdBuf;
                        }

                        sense = dev.Read12(out cmdBuf, out _, 0, false, true, false, false, 0, 2048, 0, 12, false,
                                           dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error &&
                            cmdBuf.Length == 0x6000)
                        {
                            ps2BootSectors = cmdBuf;
                        }
                    }
                    else
                    {
                        sense = dev.Read10(out cmdBuf, out _, 0, false, true, false, false, 0, 2048, 0, 1,
                                           dev.Timeout, out _);

                        if (!sense &&
                            !dev.Error)
                        {
                            sector0 = cmdBuf;

                            sense = dev.Read10(out cmdBuf, out _, 0, false, true, false, false, 1, 2048, 0, 1,
                                               dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                sector1 = cmdBuf;
                            }

                            sense = dev.Read10(out cmdBuf, out _, 0, false, true, false, false, 0, 2048, 0, 12,
                                               dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error &&
                                cmdBuf.Length == 0x6000)
                            {
                                ps2BootSectors = cmdBuf;
                            }
                        }
                        else
                        {
                            sense = dev.Read6(out cmdBuf, out _, 0, 2048, 1, dev.Timeout, out _);

                            if (!sense &&
                                !dev.Error)
                            {
                                sector0 = cmdBuf;

                                sense = dev.Read6(out cmdBuf, out _, 1, 2048, 1, dev.Timeout, out _);

                                if (!sense &&
                                    !dev.Error)
                                {
                                    sector1 = cmdBuf;
                                }

                                sense = dev.Read6(out cmdBuf, out _, 0, 2048, 12, dev.Timeout, out _);

                                if (!sense &&
                                    !dev.Error &&
                                    cmdBuf.Length == 0x6000)
                                {
                                    ps2BootSectors = cmdBuf;
                                }
                            }
                        }
                    }
                }

                break;

            // Recordables will not be checked
            case MediaType.CDR:
            case MediaType.CDRW:
            case MediaType.CDMRW:
            case MediaType.DDCDR:
            case MediaType.DDCDRW:
            case MediaType.DVDR:
            case MediaType.DVDRW:
            case MediaType.DVDPR:
            case MediaType.DVDPRW:
            case MediaType.DVDPRWDL:
            case MediaType.DVDRDL:
            case MediaType.DVDPRDL:
            case MediaType.DVDRAM:
            case MediaType.DVDRWDL:
            case MediaType.DVDDownload:
            case MediaType.HDDVDRAM:
            case MediaType.HDDVDR:
            case MediaType.HDDVDRW:
            case MediaType.HDDVDRDL:
            case MediaType.HDDVDRWDL:
            case MediaType.BDR:
            case MediaType.BDRE:
            case MediaType.BDRXL:
            case MediaType.BDREXL: return;
            }

            if (sector0 == null)
            {
                return;
            }

            switch (mediaType)
            {
            case MediaType.CD:
            case MediaType.CDDA:
            case MediaType.CDPLUS:
            case MediaType.CDROM:
            case MediaType.CDROMXA:
                // TODO: CDTV requires reading the filesystem, searching for a file called "/CDTV.TM"
                // TODO: CD32 requires reading the filesystem, searching for a file called "/CD32.TM"
                // TODO: Neo-Geo CD requires reading the filesystem and checking that the file "/IPL.TXT" is correct
                // TODO: Pippin requires interpreting Apple Partition Map, reading HFS and checking for Pippin signatures
            {
                if (CD.DecodeIPBin(sector0).HasValue)
                {
                    mediaType = MediaType.MEGACD;

                    return;
                }

                if (Saturn.DecodeIPBin(sector0).HasValue)
                {
                    mediaType = MediaType.SATURNCD;
                }

                // Are GDR detectable ???
                if (Dreamcast.DecodeIPBin(sector0).HasValue)
                {
                    mediaType = MediaType.GDROM;
                }

                if (ps2BootSectors != null &&
                    ps2BootSectors.Length == 0x6000)
                {
                    // The decryption key is applied as XOR. As first byte is originally always NULL, it gives us the key :)
                    byte decryptByte = ps2BootSectors[0];

                    for (int i = 0; i < 0x6000; i++)
                    {
                        ps2BootSectors[i] ^= decryptByte;
                    }

                    string ps2BootSectorsHash = Sha256Context.Data(ps2BootSectors, out _);

                    DicConsole.DebugWriteLine("Media-info Command", "PlayStation 2 boot sectors SHA256: {0}",
                                              ps2BootSectorsHash);

                    if (ps2BootSectorsHash == PS2_PAL_HASH ||
                        ps2BootSectorsHash == PS2_NTSC_HASH ||
                        ps2BootSectorsHash == PS2_JAPANESE_HASH)
                    {
                        mediaType = MediaType.PS2CD;
                    }
                }

                if (sector0 != null)
                {
                    byte[] syncBytes = new byte[7];
                    Array.Copy(sector0, 0, syncBytes, 0, 7);

                    if (_operaId.SequenceEqual(syncBytes))
                    {
                        mediaType = MediaType.ThreeDO;
                    }

                    if (_fmTownsBootId.SequenceEqual(syncBytes))
                    {
                        mediaType = MediaType.FMTOWNS;
                    }
                }

                if (playdia1 != null &&
                    playdia2 != null)
                {
                    byte[] pd1 = new byte[_playdiaCopyright.Length];
                    byte[] pd2 = new byte[_playdiaCopyright.Length];

                    Array.Copy(playdia1, 38, pd1, 0, pd1.Length);
                    Array.Copy(playdia2, 0, pd2, 0, pd1.Length);

                    if (_playdiaCopyright.SequenceEqual(pd1) &&
                        _playdiaCopyright.SequenceEqual(pd2))
                    {
                        mediaType = MediaType.Playdia;
                    }
                }

                if (secondDataSectorNotZero != null)
                {
                    byte[] pce = new byte[_pcEngineSignature.Length];
                    Array.Copy(secondDataSectorNotZero, 32, pce, 0, pce.Length);

                    if (_pcEngineSignature.SequenceEqual(pce))
                    {
                        mediaType = MediaType.SuperCDROM2;
                    }
                }

                if (firstDataSectorNotZero != null)
                {
                    byte[] pcfx = new byte[_pcFxSignature.Length];
                    Array.Copy(firstDataSectorNotZero, 0, pcfx, 0, pcfx.Length);

                    if (_pcFxSignature.SequenceEqual(pcfx))
                    {
                        mediaType = MediaType.PCFX;
                    }
                }

                if (firstTrackSecondSessionAudio != null)
                {
                    byte[] jaguar = new byte[_atariSignature.Length];

                    for (int i = 0; i + jaguar.Length <= firstTrackSecondSessionAudio.Length; i += 2)
                    {
                        Array.Copy(firstTrackSecondSessionAudio, i, jaguar, 0, jaguar.Length);

                        if (!_atariSignature.SequenceEqual(jaguar))
                        {
                            continue;
                        }

                        mediaType = MediaType.JaguarCD;

                        break;
                    }
                }

                if (firstTrackSecondSession != null)
                {
                    if (firstTrackSecondSession.Length >= 2336)
                    {
                        byte[] milcd = new byte[2048];
                        Array.Copy(firstTrackSecondSession, 24, milcd, 0, 2048);

                        if (Dreamcast.DecodeIPBin(milcd).HasValue)
                        {
                            mediaType = MediaType.MilCD;
                        }
                    }
                }

                // TODO: Detect black and white VideoNow
                // TODO: Detect VideoNow XP
                if (IsVideoNowColor(videoNowColorFrame))
                {
                    mediaType = MediaType.VideoNowColor;
                }

                break;
            }

            // TODO: Check for CD-i Ready
            case MediaType.CDI: break;

            case MediaType.DVDROM:
            case MediaType.HDDVDROM:
            case MediaType.BDROM:
            case MediaType.Unknown:
                // TODO: Nuon requires reading the filesystem, searching for a file called "/NUON/NUON.RUN"
                if (ps2BootSectors != null &&
                    ps2BootSectors.Length == 0x6000)
                {
                    // The decryption key is applied as XOR. As first byte is originally always NULL, it gives us the key :)
                    byte decryptByte = ps2BootSectors[0];

                    for (int i = 0; i < 0x6000; i++)
                    {
                        ps2BootSectors[i] ^= decryptByte;
                    }

                    string ps2BootSectorsHash = Sha256Context.Data(ps2BootSectors, out _);

                    DicConsole.DebugWriteLine("Media-info Command", "PlayStation 2 boot sectors SHA256: {0}",
                                              ps2BootSectorsHash);

                    if (ps2BootSectorsHash == PS2_PAL_HASH ||
                        ps2BootSectorsHash == PS2_NTSC_HASH ||
                        ps2BootSectorsHash == PS2_JAPANESE_HASH)
                    {
                        mediaType = MediaType.PS2DVD;
                    }
                }

                if (sector1 != null)
                {
                    byte[] tmp = new byte[_ps3Id.Length];
                    Array.Copy(sector1, 0, tmp, 0, tmp.Length);

                    if (tmp.SequenceEqual(_ps3Id))
                    {
                        switch (mediaType)
                        {
                        case MediaType.BDROM:
                            mediaType = MediaType.PS3BD;

                            break;

                        case MediaType.DVDROM:
                            mediaType = MediaType.PS3DVD;

                            break;
                        }
                    }

                    tmp = new byte[_ps4Id.Length];
                    Array.Copy(sector1, 512, tmp, 0, tmp.Length);

                    if (tmp.SequenceEqual(_ps4Id) &&
                        mediaType == MediaType.BDROM)
                    {
                        mediaType = MediaType.PS4BD;
                    }
                }

                // TODO: Identify discs that require reading tracks (PC-FX, PlayStation, Sega, etc)
                break;
            }
        }
Ejemplo n.º 3
0
        public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information,
                                   Encoding encoding)
        {
            Encoding    = encoding ?? Encoding.ASCII;
            information = "";
            StringBuilder isoMetadata = new StringBuilder();

            byte[] vdMagic = new byte[5];            // Volume Descriptor magic "CD001"
            byte[] hsMagic = new byte[5];            // Volume Descriptor magic "CDROM"

            string bootSpec = "";

            PrimaryVolumeDescriptor?pvd      = null;
            PrimaryVolumeDescriptor?jolietvd = null;
            BootRecord?bvd = null;
            HighSierraPrimaryVolumeDescriptor?hsvd = null;
            FileStructureVolumeDescriptor?    fsvd = null;
            ElToritoBootRecord?torito = null;

            // ISO9660 is designed for 2048 bytes/sector devices
            if (imagePlugin.Info.SectorSize < 2048)
            {
                return;
            }

            // ISO9660 Primary Volume Descriptor starts at sector 16, so that's minimal size.
            if (partition.End < 16)
            {
                return;
            }

            ulong counter = 0;

            byte[] vdSector = imagePlugin.ReadSector(16 + counter + partition.Start);
            int    xaOff    = vdSector.Length == 2336 ? 8 : 0;

            Array.Copy(vdSector, 0x009 + xaOff, hsMagic, 0, 5);
            bool highSierra = Encoding.GetString(hsMagic) == HIGH_SIERRA_MAGIC;
            int  hsOff      = 0;

            if (highSierra)
            {
                hsOff = 8;
            }
            bool cdi = false;

            while (true)
            {
                DicConsole.DebugWriteLine("ISO9660 plugin", "Processing VD loop no. {0}", counter);
                // Seek to Volume Descriptor
                DicConsole.DebugWriteLine("ISO9660 plugin", "Reading sector {0}", 16 + counter + partition.Start);
                byte[] vdSectorTmp = imagePlugin.ReadSector(16 + counter + partition.Start);
                vdSector = new byte[vdSectorTmp.Length - xaOff];
                Array.Copy(vdSectorTmp, xaOff, vdSector, 0, vdSector.Length);

                byte vdType = vdSector[0 + hsOff]; // Volume Descriptor Type, should be 1 or 2.
                DicConsole.DebugWriteLine("ISO9660 plugin", "VDType = {0}", vdType);

                if (vdType == 255) // Supposedly we are in the PVD.
                {
                    if (counter == 0)
                    {
                        return;
                    }

                    break;
                }

                Array.Copy(vdSector, 0x001, vdMagic, 0, 5);
                Array.Copy(vdSector, 0x009, hsMagic, 0, 5);

                if (Encoding.GetString(vdMagic) != ISO_MAGIC && Encoding.GetString(hsMagic) != HIGH_SIERRA_MAGIC &&
                    Encoding.GetString(vdMagic) != CDI_MAGIC
                    ) // Recognized, it is an ISO9660, now check for rest of data.
                {
                    if (counter == 0)
                    {
                        return;
                    }

                    break;
                }

                cdi |= Encoding.GetString(vdMagic) == CDI_MAGIC;

                switch (vdType)
                {
                case 0:
                {
                    IntPtr ptr = Marshal.AllocHGlobal(2048);
                    Marshal.Copy(vdSector, hsOff, ptr, 2048 - hsOff);
                    bvd = (BootRecord)Marshal.PtrToStructure(ptr, typeof(BootRecord));
                    Marshal.FreeHGlobal(ptr);

                    bootSpec = "Unknown";

                    if (Encoding.GetString(bvd.Value.system_id).Substring(0, 23) == "EL TORITO SPECIFICATION")
                    {
                        bootSpec = "El Torito";
                        ptr      = Marshal.AllocHGlobal(2048);
                        Marshal.Copy(vdSector, hsOff, ptr, 2048 - hsOff);
                        torito = (ElToritoBootRecord)Marshal.PtrToStructure(ptr, typeof(ElToritoBootRecord));
                        Marshal.FreeHGlobal(ptr);
                    }

                    break;
                }

                case 1:
                {
                    if (highSierra)
                    {
                        IntPtr ptr = Marshal.AllocHGlobal(2048);
                        Marshal.Copy(vdSector, 0, ptr, 2048);
                        hsvd =
                            (HighSierraPrimaryVolumeDescriptor)
                            Marshal.PtrToStructure(ptr, typeof(HighSierraPrimaryVolumeDescriptor));
                        Marshal.FreeHGlobal(ptr);
                    }
                    else if (cdi)
                    {
                        fsvd =
                            BigEndianMarshal.ByteArrayToStructureBigEndian <FileStructureVolumeDescriptor>(vdSector);
                    }
                    else
                    {
                        IntPtr ptr = Marshal.AllocHGlobal(2048);
                        Marshal.Copy(vdSector, 0, ptr, 2048);
                        pvd = (PrimaryVolumeDescriptor)Marshal.PtrToStructure(ptr, typeof(PrimaryVolumeDescriptor));
                        Marshal.FreeHGlobal(ptr);
                    }

                    break;
                }

                case 2:
                {
                    IntPtr ptr = Marshal.AllocHGlobal(2048);
                    Marshal.Copy(vdSector, 0, ptr, 2048);
                    PrimaryVolumeDescriptor svd =
                        (PrimaryVolumeDescriptor)Marshal.PtrToStructure(ptr, typeof(PrimaryVolumeDescriptor));
                    Marshal.FreeHGlobal(ptr);

                    // Check if this is Joliet
                    if (svd.escape_sequences[0] == '%' && svd.escape_sequences[1] == '/')
                    {
                        if (svd.escape_sequences[2] == '@' || svd.escape_sequences[2] == 'C' ||
                            svd.escape_sequences[2] == 'E')
                        {
                            jolietvd = svd;
                        }
                        else
                        {
                            DicConsole.WriteLine("ISO9660 plugin", "Found unknown supplementary volume descriptor");
                        }
                    }

                    break;
                }
                }

                counter++;
            }

            DecodedVolumeDescriptor decodedVd;
            DecodedVolumeDescriptor decodedJolietVd = new DecodedVolumeDescriptor();

            XmlFsType = new FileSystemType();

            if (pvd == null && hsvd == null && fsvd == null)
            {
                information = "ERROR: Could not find primary volume descriptor";
                return;
            }

            if (highSierra)
            {
                decodedVd = DecodeVolumeDescriptor(hsvd.Value);
            }
            else if (cdi)
            {
                decodedVd = DecodeVolumeDescriptor(fsvd.Value);
            }
            else
            {
                decodedVd = DecodeVolumeDescriptor(pvd.Value);
            }

            if (jolietvd != null)
            {
                decodedJolietVd = DecodeJolietDescriptor(jolietvd.Value);
            }

            uint rootLocation = 0;
            uint rootSize     = 0;

            // No need to read root on CD-i, as extensions are not supported...
            if (!cdi)
            {
                rootLocation = highSierra
                                   ? hsvd.Value.root_directory_record.extent
                                   : pvd.Value.root_directory_record.extent;

                if (highSierra)
                {
                    rootSize = hsvd.Value.root_directory_record.size / hsvd.Value.logical_block_size;
                    if (hsvd.Value.root_directory_record.size % hsvd.Value.logical_block_size > 0)
                    {
                        rootSize++;
                    }
                }
                else
                {
                    rootSize = pvd.Value.root_directory_record.size / pvd.Value.logical_block_size;
                    if (pvd.Value.root_directory_record.size % pvd.Value.logical_block_size > 0)
                    {
                        rootSize++;
                    }
                }
            }

            byte[] rootDir      = new byte[0];
            int    rootOff      = 0;
            bool   xaExtensions = false;
            bool   apple        = false;
            bool   susp         = false;
            bool   rrip         = false;
            bool   ziso         = false;
            bool   amiga        = false;
            bool   aaip         = false;
            List <ContinuationArea> contareas       = new List <ContinuationArea>();
            List <byte[]>           refareas        = new List <byte[]>();
            StringBuilder           suspInformation = new StringBuilder();

            if (rootLocation + rootSize < imagePlugin.Info.Sectors)
            {
                rootDir = imagePlugin.ReadSectors(rootLocation, rootSize);
            }

            BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;

            // Walk thru root directory to see system area extensions in use
            while (rootOff + Marshal.SizeOf(typeof(DirectoryRecord)) < rootDir.Length && !cdi)
            {
                DirectoryRecord record = new DirectoryRecord();
                IntPtr          ptr    = Marshal.AllocHGlobal(Marshal.SizeOf(record));
                Marshal.Copy(rootDir, rootOff, ptr, Marshal.SizeOf(record));
                record = (DirectoryRecord)Marshal.PtrToStructure(ptr, typeof(DirectoryRecord));
                Marshal.FreeHGlobal(ptr);

                int saOff = Marshal.SizeOf(record) + record.name_len;
                saOff += saOff % 2;
                int saLen = record.length - saOff;

                if (saLen > 0 && rootOff + saOff + saLen <= rootDir.Length)
                {
                    byte[] sa = new byte[saLen];
                    Array.Copy(rootDir, rootOff + saOff, sa, 0, saLen);
                    saOff = 0;

                    while (saOff < saLen)
                    {
                        bool noneFound = true;

                        if (Marshal.SizeOf(typeof(CdromXa)) + saOff <= saLen)
                        {
                            CdromXa xa = BigEndianMarshal.ByteArrayToStructureBigEndian <CdromXa>(sa);
                            if (xa.signature == XA_MAGIC)
                            {
                                xaExtensions = true;
                                saOff       += Marshal.SizeOf(typeof(CdromXa));
                                noneFound    = false;
                            }
                        }

                        if (saOff + 2 >= saLen)
                        {
                            break;
                        }

                        ushort nextSignature = BigEndianBitConverter.ToUInt16(sa, saOff);

                        switch (nextSignature)
                        {
                        // Easy, contains size field
                        case APPLE_MAGIC:
                            apple     = true;
                            saOff    += sa[saOff + 2];
                            noneFound = false;
                            break;

                        // Not easy, contains size field
                        case APPLE_MAGIC_OLD:
                            apple = true;
                            AppleOldId appleId = (AppleOldId)sa[saOff + 2];
                            noneFound = false;

                            switch (appleId)
                            {
                            case AppleOldId.ProDOS:
                                saOff += Marshal.SizeOf(typeof(AppleProDOSOldSystemUse));
                                break;

                            case AppleOldId.TypeCreator:
                            case AppleOldId.TypeCreatorBundle:
                                saOff += Marshal.SizeOf(typeof(AppleHFSTypeCreatorSystemUse));
                                break;

                            case AppleOldId.TypeCreatorIcon:
                            case AppleOldId.TypeCreatorIconBundle:
                                saOff += Marshal.SizeOf(typeof(AppleHFSIconSystemUse));
                                break;

                            case AppleOldId.HFS:
                                saOff += Marshal.SizeOf(typeof(AppleHFSOldSystemUse));
                                break;
                            }

                            break;

                        // IEEE-P1281 aka SUSP 1.12
                        case SUSP_INDICATOR:
                            susp      = true;
                            saOff    += sa[saOff + 2];
                            noneFound = false;

                            while (saOff + 2 < saLen)
                            {
                                nextSignature = BigEndianBitConverter.ToUInt16(sa, saOff);

                                switch (nextSignature)
                                {
                                case APPLE_MAGIC:
                                    if (sa[saOff + 3] == 1 && sa[saOff + 2] == 7)
                                    {
                                        apple = true;
                                    }
                                    else
                                    {
                                        apple |= sa[saOff + 3] != 1;
                                    }
                                    break;

                                case SUSP_CONTINUATION when saOff + sa[saOff + 2] <= saLen:
                                    byte[] ce = new byte[sa[saOff + 2]];
                                    Array.Copy(sa, saOff, ce, 0, ce.Length);
                                    ContinuationArea ca = BigEndianMarshal
                                                          .ByteArrayToStructureBigEndian <ContinuationArea>(ce);
                                    contareas.Add(ca);
                                    break;

                                case SUSP_REFERENCE when saOff + sa[saOff + 2] <= saLen:
                                    byte[] er = new byte[sa[saOff + 2]];
                                    Array.Copy(sa, saOff, er, 0, er.Length);
                                    refareas.Add(er);
                                    break;
                                }

                                rrip |= nextSignature == RRIP_MAGIC ||
                                        nextSignature == RRIP_POSIX_ATTRIBUTES ||
                                        nextSignature == RRIP_POSIX_DEV_NO ||
                                        nextSignature == RRIP_SYMLINK ||
                                        nextSignature == RRIP_NAME ||
                                        nextSignature == RRIP_CHILDLINK ||
                                        nextSignature == RRIP_PARENTLINK ||
                                        nextSignature == RRIP_RELOCATED_DIR ||
                                        nextSignature == RRIP_TIMESTAMPS || nextSignature == RRIP_SPARSE;

                                ziso  |= nextSignature == ZISO_MAGIC;
                                amiga |= nextSignature == AMIGA_MAGIC;
                                aaip  |= nextSignature == AAIP_MAGIC || nextSignature == AAIP_MAGIC_OLD &&
                                         sa[saOff + 3] == 1 &&
                                         sa[saOff + 2] >= 9;

                                saOff += sa[saOff + 2];

                                if (nextSignature == SUSP_TERMINATOR)
                                {
                                    break;
                                }
                            }

                            break;
                        }

                        if (noneFound)
                        {
                            break;
                        }
                    }
                }

                rootOff += record.length;

                if (record.length == 0)
                {
                    break;
                }
            }

            foreach (ContinuationArea ca in contareas)
            {
                uint caLen = (ca.ca_length_be + ca.offset_be) /
                             (highSierra ? hsvd.Value.logical_block_size : pvd.Value.logical_block_size);
                if ((ca.ca_length_be + ca.offset_be) %
                    (highSierra ? hsvd.Value.logical_block_size : pvd.Value.logical_block_size) > 0)
                {
                    caLen++;
                }

                byte[] caSectors = imagePlugin.ReadSectors(ca.block_be, caLen);
                byte[] caData    = new byte[ca.ca_length_be];
                Array.Copy(caSectors, ca.offset_be, caData, 0, ca.ca_length_be);
                int caOff = 0;

                while (caOff < ca.ca_length_be)
                {
                    ushort nextSignature = BigEndianBitConverter.ToUInt16(caData, caOff);

                    switch (nextSignature)
                    {
                    // Apple never said to include its extensions inside a continuation area, but just in case
                    case APPLE_MAGIC:
                        if (caData[caOff + 3] == 1 && caData[caOff + 2] == 7)
                        {
                            apple = true;
                        }
                        else
                        {
                            apple |= caData[caOff + 3] != 1;
                        }
                        break;

                    case SUSP_REFERENCE when caOff + caData[caOff + 2] <= ca.ca_length_be:
                        byte[] er = new byte[caData[caOff + 2]];
                        Array.Copy(caData, caOff, er, 0, er.Length);
                        refareas.Add(er);
                        break;
                    }

                    rrip |= nextSignature == RRIP_MAGIC || nextSignature == RRIP_POSIX_ATTRIBUTES ||
                            nextSignature == RRIP_POSIX_DEV_NO || nextSignature == RRIP_SYMLINK ||
                            nextSignature == RRIP_NAME || nextSignature == RRIP_CHILDLINK ||
                            nextSignature == RRIP_PARENTLINK || nextSignature == RRIP_RELOCATED_DIR ||
                            nextSignature == RRIP_TIMESTAMPS || nextSignature == RRIP_SPARSE;

                    ziso  |= nextSignature == ZISO_MAGIC;
                    amiga |= nextSignature == AMIGA_MAGIC;
                    aaip  |= nextSignature == AAIP_MAGIC || nextSignature == AAIP_MAGIC_OLD && caData[caOff + 3] == 1 &&
                             caData[caOff + 2] >= 9;

                    caOff += caData[caOff + 2];
                }
            }

            if (refareas.Count > 0)
            {
                suspInformation.AppendLine("----------------------------------------");
                suspInformation.AppendLine("SYSTEM USE SHARING PROTOCOL INFORMATION:");
                suspInformation.AppendLine("----------------------------------------");

                counter = 1;
                foreach (byte[] erb in refareas)
                {
                    ReferenceArea er    = BigEndianMarshal.ByteArrayToStructureBigEndian <ReferenceArea>(erb);
                    string        extId =
                        Encoding.GetString(erb, Marshal.SizeOf(er), er.id_len);
                    string extDes =
                        Encoding.GetString(erb, Marshal.SizeOf(er) + er.id_len, er.des_len);
                    string extSrc =
                        Encoding.GetString(erb, Marshal.SizeOf(er) + er.id_len + er.des_len, er.src_len);
                    suspInformation.AppendFormat("Extension: {0}", counter).AppendLine();
                    suspInformation.AppendFormat("\tID: {0}, version {1}", extId, er.ext_ver).AppendLine();
                    suspInformation.AppendFormat("\tDescription: {0}", extDes).AppendLine();
                    suspInformation.AppendFormat("\tSource: {0}", extSrc).AppendLine();
                    counter++;
                }
            }

            byte[]          ipbinSector = imagePlugin.ReadSector(0 + partition.Start);
            CD.IPBin?       segaCd      = CD.DecodeIPBin(ipbinSector);
            Saturn.IPBin?   saturn      = Saturn.DecodeIPBin(ipbinSector);
            Dreamcast.IPBin?dreamcast   = Dreamcast.DecodeIPBin(ipbinSector);

            string fsFormat;

            if (highSierra)
            {
                fsFormat = "High Sierra Format";
            }
            else if (cdi)
            {
                fsFormat = "CD-i";
            }
            else
            {
                fsFormat = "ISO9660";
            }

            isoMetadata.AppendFormat("{0} file system", fsFormat).AppendLine();
            if (xaExtensions)
            {
                isoMetadata.AppendLine("CD-ROM XA extensions present.");
            }
            if (amiga)
            {
                isoMetadata.AppendLine("Amiga extensions present.");
            }
            if (apple)
            {
                isoMetadata.AppendLine("Apple extensions present.");
            }
            if (jolietvd != null)
            {
                isoMetadata.AppendLine("Joliet extensions present.");
            }
            if (susp)
            {
                isoMetadata.AppendLine("System Use Sharing Protocol present.");
            }
            if (rrip)
            {
                isoMetadata.AppendLine("Rock Ridge Interchange Protocol present.");
            }
            if (aaip)
            {
                isoMetadata.AppendLine("Arbitrary Attribute Interchange Protocol present.");
            }
            if (ziso)
            {
                isoMetadata.AppendLine("zisofs compression present.");
            }
            if (bvd != null)
            {
                isoMetadata.AppendFormat("Disc bootable following {0} specifications.", bootSpec).AppendLine();
            }
            if (segaCd != null)
            {
                isoMetadata.AppendLine("This is a SegaCD / MegaCD disc.");
                isoMetadata.AppendLine(CD.Prettify(segaCd));
            }

            if (saturn != null)
            {
                isoMetadata.AppendLine("This is a Sega Saturn disc.");
                isoMetadata.AppendLine(Saturn.Prettify(saturn));
            }

            if (dreamcast != null)
            {
                isoMetadata.AppendLine("This is a Sega Dreamcast disc.");
                isoMetadata.AppendLine(Dreamcast.Prettify(dreamcast));
            }

            isoMetadata.AppendFormat("{0}------------------------------", cdi ? "---------------" : "").AppendLine();
            isoMetadata.AppendFormat("{0}VOLUME DESCRIPTOR INFORMATION:", cdi ? "FILE STRUCTURE " : "").AppendLine();
            isoMetadata.AppendFormat("{0}------------------------------", cdi ? "---------------" : "").AppendLine();
            isoMetadata.AppendFormat("System identifier: {0}", decodedVd.SystemIdentifier).AppendLine();
            isoMetadata.AppendFormat("Volume identifier: {0}", decodedVd.VolumeIdentifier).AppendLine();
            isoMetadata.AppendFormat("Volume set identifier: {0}", decodedVd.VolumeSetIdentifier).AppendLine();
            isoMetadata.AppendFormat("Publisher identifier: {0}", decodedVd.PublisherIdentifier).AppendLine();
            isoMetadata.AppendFormat("Data preparer identifier: {0}", decodedVd.DataPreparerIdentifier).AppendLine();
            isoMetadata.AppendFormat("Application identifier: {0}", decodedVd.ApplicationIdentifier).AppendLine();
            isoMetadata.AppendFormat("Volume creation date: {0}", decodedVd.CreationTime).AppendLine();
            if (decodedVd.HasModificationTime)
            {
                isoMetadata.AppendFormat("Volume modification date: {0}", decodedVd.ModificationTime).AppendLine();
            }
            else
            {
                isoMetadata.AppendFormat("Volume has not been modified.").AppendLine();
            }
            if (decodedVd.HasExpirationTime)
            {
                isoMetadata.AppendFormat("Volume expiration date: {0}", decodedVd.ExpirationTime).AppendLine();
            }
            else
            {
                isoMetadata.AppendFormat("Volume does not expire.").AppendLine();
            }
            if (decodedVd.HasEffectiveTime)
            {
                isoMetadata.AppendFormat("Volume effective date: {0}", decodedVd.EffectiveTime).AppendLine();
            }
            else
            {
                isoMetadata.AppendFormat("Volume has always been effective.").AppendLine();
            }
            isoMetadata.AppendFormat("Volume has {0} blocks of {1} bytes each", decodedVd.Blocks, decodedVd.BlockSize)
            .AppendLine();

            if (jolietvd != null)
            {
                isoMetadata.AppendLine("-------------------------------------");
                isoMetadata.AppendLine("JOLIET VOLUME DESCRIPTOR INFORMATION:");
                isoMetadata.AppendLine("-------------------------------------");
                isoMetadata.AppendFormat("System identifier: {0}", decodedJolietVd.SystemIdentifier).AppendLine();
                isoMetadata.AppendFormat("Volume identifier: {0}", decodedJolietVd.VolumeIdentifier).AppendLine();
                isoMetadata.AppendFormat("Volume set identifier: {0}", decodedJolietVd.VolumeSetIdentifier)
                .AppendLine();
                isoMetadata.AppendFormat("Publisher identifier: {0}", decodedJolietVd.PublisherIdentifier).AppendLine();
                isoMetadata.AppendFormat("Data preparer identifier: {0}", decodedJolietVd.DataPreparerIdentifier)
                .AppendLine();
                isoMetadata.AppendFormat("Application identifier: {0}", decodedJolietVd.ApplicationIdentifier)
                .AppendLine();
                isoMetadata.AppendFormat("Volume creation date: {0}", decodedJolietVd.CreationTime).AppendLine();
                if (decodedJolietVd.HasModificationTime)
                {
                    isoMetadata.AppendFormat("Volume modification date: {0}", decodedJolietVd.ModificationTime)
                    .AppendLine();
                }
                else
                {
                    isoMetadata.AppendFormat("Volume has not been modified.").AppendLine();
                }
                if (decodedJolietVd.HasExpirationTime)
                {
                    isoMetadata.AppendFormat("Volume expiration date: {0}", decodedJolietVd.ExpirationTime)
                    .AppendLine();
                }
                else
                {
                    isoMetadata.AppendFormat("Volume does not expire.").AppendLine();
                }
                if (decodedJolietVd.HasEffectiveTime)
                {
                    isoMetadata.AppendFormat("Volume effective date: {0}", decodedJolietVd.EffectiveTime).AppendLine();
                }
                else
                {
                    isoMetadata.AppendFormat("Volume has always been effective.").AppendLine();
                }
            }

            if (torito != null)
            {
                vdSector = imagePlugin.ReadSector(torito.Value.catalog_sector + partition.Start);

                int toritoOff = 0;

                if (vdSector[toritoOff] != 1)
                {
                    goto exit_torito;
                }

                IntPtr ptr = Marshal.AllocHGlobal(EL_TORITO_ENTRY_SIZE);
                Marshal.Copy(vdSector, toritoOff, ptr, EL_TORITO_ENTRY_SIZE);
                ElToritoValidationEntry valentry =
                    (ElToritoValidationEntry)Marshal.PtrToStructure(ptr, typeof(ElToritoValidationEntry));
                Marshal.FreeHGlobal(ptr);

                if (valentry.signature != EL_TORITO_MAGIC)
                {
                    goto exit_torito;
                }

                toritoOff += EL_TORITO_ENTRY_SIZE;

                ptr = Marshal.AllocHGlobal(EL_TORITO_ENTRY_SIZE);
                Marshal.Copy(vdSector, toritoOff, ptr, EL_TORITO_ENTRY_SIZE);
                ElToritoInitialEntry initialEntry =
                    (ElToritoInitialEntry)Marshal.PtrToStructure(ptr, typeof(ElToritoInitialEntry));
                Marshal.FreeHGlobal(ptr);
                initialEntry.boot_type = (ElToritoEmulation)((byte)initialEntry.boot_type & 0xF);

                DicConsole.DebugWriteLine("DEBUG (ISO9660 plugin)", "initialEntry.load_rba = {0}",
                                          initialEntry.load_rba);
                DicConsole.DebugWriteLine("DEBUG (ISO9660 plugin)", "initialEntry.sector_count = {0}",
                                          initialEntry.sector_count);

                byte[] bootImage =
                    initialEntry.load_rba + partition.Start + initialEntry.sector_count - 1 <= partition.End
                        ? imagePlugin.ReadSectors(initialEntry.load_rba + partition.Start, initialEntry.sector_count)
                        : null;

                isoMetadata.AppendLine("----------------------");
                isoMetadata.AppendLine("EL TORITO INFORMATION:");
                isoMetadata.AppendLine("----------------------");

                isoMetadata.AppendLine("Initial entry:");
                isoMetadata.AppendFormat("\tDeveloper ID: {0}", Encoding.GetString(valentry.developer_id)).AppendLine();
                if (initialEntry.bootable == ElToritoIndicator.Bootable)
                {
                    isoMetadata.AppendFormat("\tBootable on {0}", valentry.platform_id).AppendLine();
                    isoMetadata.AppendFormat("\tBootable image starts at sector {0} and runs for {1} sectors",
                                             initialEntry.load_rba, initialEntry.sector_count).AppendLine();
                    if (valentry.platform_id == ElToritoPlatform.x86)
                    {
                        isoMetadata.AppendFormat("\tBootable image will be loaded at segment {0:X4}h",
                                                 initialEntry.load_seg == 0 ? 0x7C0 : initialEntry.load_seg)
                        .AppendLine();
                    }
                    else
                    {
                        isoMetadata.AppendFormat("\tBootable image will be loaded at 0x{0:X8}",
                                                 (uint)initialEntry.load_seg * 10).AppendLine();
                    }
                    switch (initialEntry.boot_type)
                    {
                    case ElToritoEmulation.None:
                        isoMetadata.AppendLine("\tImage uses no emulation");
                        break;

                    case ElToritoEmulation.Md2hd:
                        isoMetadata.AppendLine("\tImage emulates a 5.25\" high-density (MD2HD, 1.2Mb) floppy");
                        break;

                    case ElToritoEmulation.Mf2hd:
                        isoMetadata.AppendLine("\tImage emulates a 3.5\" high-density (MF2HD, 1.44Mb) floppy");
                        break;

                    case ElToritoEmulation.Mf2ed:
                        isoMetadata.AppendLine("\tImage emulates a 3.5\" extra-density (MF2ED, 2.88Mb) floppy");
                        break;

                    default:
                        isoMetadata.AppendFormat("\tImage uses unknown emulation type {0}",
                                                 (byte)initialEntry.boot_type).AppendLine();
                        break;
                    }

                    isoMetadata.AppendFormat("\tSystem type: 0x{0:X2}", initialEntry.system_type).AppendLine();
                    if (bootImage != null)
                    {
                        isoMetadata.AppendFormat("\tBootable image's SHA1: {0}", Sha1Context.Data(bootImage, out _))
                        .AppendLine();
                    }
                }
                else
                {
                    isoMetadata.AppendLine("\tNot bootable");
                }

                toritoOff += EL_TORITO_ENTRY_SIZE;

                const int SECTION_COUNTER = 2;

                while (toritoOff < vdSector.Length && (vdSector[toritoOff] == (byte)ElToritoIndicator.Header ||
                                                       vdSector[toritoOff] == (byte)ElToritoIndicator.LastHeader))
                {
                    ptr = Marshal.AllocHGlobal(EL_TORITO_ENTRY_SIZE);
                    Marshal.Copy(vdSector, toritoOff, ptr, EL_TORITO_ENTRY_SIZE);
                    ElToritoSectionHeaderEntry sectionHeader =
                        (ElToritoSectionHeaderEntry)Marshal.PtrToStructure(ptr, typeof(ElToritoSectionHeaderEntry));
                    Marshal.FreeHGlobal(ptr);
                    toritoOff += EL_TORITO_ENTRY_SIZE;

                    isoMetadata.AppendFormat("Boot section {0}:", SECTION_COUNTER);
                    isoMetadata.AppendFormat("\tSection ID: {0}", Encoding.GetString(sectionHeader.identifier))
                    .AppendLine();

                    for (int entryCounter = 1; entryCounter <= sectionHeader.entries && toritoOff < vdSector.Length;
                         entryCounter++)
                    {
                        ptr = Marshal.AllocHGlobal(EL_TORITO_ENTRY_SIZE);
                        Marshal.Copy(vdSector, toritoOff, ptr, EL_TORITO_ENTRY_SIZE);
                        ElToritoSectionEntry sectionEntry =
                            (ElToritoSectionEntry)Marshal.PtrToStructure(ptr, typeof(ElToritoSectionEntry));
                        Marshal.FreeHGlobal(ptr);
                        toritoOff += EL_TORITO_ENTRY_SIZE;

                        isoMetadata.AppendFormat("\tEntry {0}:", entryCounter);
                        if (sectionEntry.bootable == ElToritoIndicator.Bootable)
                        {
                            bootImage =
                                sectionEntry.load_rba + partition.Start + sectionEntry.sector_count - 1 <= partition.End
                                    ? imagePlugin.ReadSectors(sectionEntry.load_rba + partition.Start,
                                                              sectionEntry.sector_count)
                                    : null;

                            isoMetadata.AppendFormat("\t\tBootable on {0}", sectionHeader.platform_id).AppendLine();
                            isoMetadata.AppendFormat("\t\tBootable image starts at sector {0} and runs for {1} sectors",
                                                     sectionEntry.load_rba, sectionEntry.sector_count).AppendLine();
                            if (valentry.platform_id == ElToritoPlatform.x86)
                            {
                                isoMetadata.AppendFormat("\t\tBootable image will be loaded at segment {0:X4}h",
                                                         sectionEntry.load_seg == 0 ? 0x7C0 : sectionEntry.load_seg)
                                .AppendLine();
                            }
                            else
                            {
                                isoMetadata.AppendFormat("\t\tBootable image will be loaded at 0x{0:X8}",
                                                         (uint)sectionEntry.load_seg * 10).AppendLine();
                            }
                            switch ((ElToritoEmulation)((byte)sectionEntry.boot_type & 0xF))
                            {
                            case ElToritoEmulation.None:
                                isoMetadata.AppendLine("\t\tImage uses no emulation");
                                break;

                            case ElToritoEmulation.Md2hd:
                                isoMetadata
                                .AppendLine("\t\tImage emulates a 5.25\" high-density (MD2HD, 1.2Mb) floppy");
                                break;

                            case ElToritoEmulation.Mf2hd:
                                isoMetadata
                                .AppendLine("\t\tImage emulates a 3.5\" high-density (MF2HD, 1.44Mb) floppy");
                                break;

                            case ElToritoEmulation.Mf2ed:
                                isoMetadata
                                .AppendLine("\t\tImage emulates a 3.5\" extra-density (MF2ED, 2.88Mb) floppy");
                                break;

                            default:
                                isoMetadata.AppendFormat("\t\tImage uses unknown emulation type {0}",
                                                         (byte)initialEntry.boot_type).AppendLine();
                                break;
                            }

                            isoMetadata.AppendFormat("\t\tSelection criteria type: {0}",
                                                     sectionEntry.selection_criteria_type).AppendLine();
                            isoMetadata.AppendFormat("\t\tSystem type: 0x{0:X2}", sectionEntry.system_type)
                            .AppendLine();
                            if (bootImage != null)
                            {
                                isoMetadata.AppendFormat("\t\tBootable image's SHA1: {0}",
                                                         Sha1Context.Data(bootImage, out _)).AppendLine();
                            }
                        }
                        else
                        {
                            isoMetadata.AppendLine("\t\tNot bootable");
                        }

                        ElToritoFlags flags = (ElToritoFlags)((byte)sectionEntry.boot_type & 0xF0);
                        if (flags.HasFlag(ElToritoFlags.ATAPI))
                        {
                            isoMetadata.AppendLine("\t\tImage contains ATAPI drivers");
                        }
                        if (flags.HasFlag(ElToritoFlags.SCSI))
                        {
                            isoMetadata.AppendLine("\t\tImage contains SCSI drivers");
                        }

                        if (!flags.HasFlag(ElToritoFlags.Continued))
                        {
                            continue;
                        }

                        while (toritoOff < vdSector.Length)
                        {
                            ptr = Marshal.AllocHGlobal(EL_TORITO_ENTRY_SIZE);
                            Marshal.Copy(vdSector, toritoOff, ptr, EL_TORITO_ENTRY_SIZE);
                            ElToritoSectionEntryExtension sectionExtension =
                                (ElToritoSectionEntryExtension)
                                Marshal.PtrToStructure(ptr, typeof(ElToritoSectionEntryExtension));
                            Marshal.FreeHGlobal(ptr);
                            toritoOff += EL_TORITO_ENTRY_SIZE;

                            if (!sectionExtension.extension_flags.HasFlag(ElToritoFlags.Continued))
                            {
                                break;
                            }
                        }
                    }

                    if (sectionHeader.header_id == ElToritoIndicator.LastHeader)
                    {
                        break;
                    }
                }
            }

exit_torito:
            if (refareas.Count > 0)
            {
                isoMetadata.Append(suspInformation);
            }

            XmlFsType.Type = fsFormat;

            if (jolietvd != null)
            {
                XmlFsType.VolumeName = decodedJolietVd.VolumeIdentifier;

                if (decodedJolietVd.SystemIdentifier == null ||
                    decodedVd.SystemIdentifier.Length > decodedJolietVd.SystemIdentifier.Length)
                {
                    XmlFsType.SystemIdentifier = decodedVd.SystemIdentifier;
                }
                else
                {
                    XmlFsType.SystemIdentifier = decodedJolietVd.SystemIdentifier;
                }

                if (decodedJolietVd.VolumeSetIdentifier == null || decodedVd.VolumeSetIdentifier.Length >
                    decodedJolietVd.VolumeSetIdentifier.Length)
                {
                    XmlFsType.VolumeSetIdentifier = decodedVd.VolumeSetIdentifier;
                }
                else
                {
                    XmlFsType.VolumeSetIdentifier = decodedJolietVd.VolumeSetIdentifier;
                }

                if (decodedJolietVd.PublisherIdentifier == null || decodedVd.PublisherIdentifier.Length >
                    decodedJolietVd.PublisherIdentifier.Length)
                {
                    XmlFsType.PublisherIdentifier = decodedVd.PublisherIdentifier;
                }
                else
                {
                    XmlFsType.PublisherIdentifier = decodedJolietVd.PublisherIdentifier;
                }

                if (decodedJolietVd.DataPreparerIdentifier == null || decodedVd.DataPreparerIdentifier.Length >
                    decodedJolietVd.DataPreparerIdentifier.Length)
                {
                    XmlFsType.DataPreparerIdentifier = decodedVd.DataPreparerIdentifier;
                }
                else
                {
                    XmlFsType.DataPreparerIdentifier = decodedJolietVd.SystemIdentifier;
                }

                if (decodedJolietVd.ApplicationIdentifier == null || decodedVd.ApplicationIdentifier.Length >
                    decodedJolietVd.ApplicationIdentifier.Length)
                {
                    XmlFsType.ApplicationIdentifier = decodedVd.ApplicationIdentifier;
                }
                else
                {
                    XmlFsType.ApplicationIdentifier = decodedJolietVd.SystemIdentifier;
                }

                XmlFsType.CreationDate          = decodedJolietVd.CreationTime;
                XmlFsType.CreationDateSpecified = true;
                if (decodedJolietVd.HasModificationTime)
                {
                    XmlFsType.ModificationDate          = decodedJolietVd.ModificationTime;
                    XmlFsType.ModificationDateSpecified = true;
                }

                if (decodedJolietVd.HasExpirationTime)
                {
                    XmlFsType.ExpirationDate          = decodedJolietVd.ExpirationTime;
                    XmlFsType.ExpirationDateSpecified = true;
                }

                if (decodedJolietVd.HasEffectiveTime)
                {
                    XmlFsType.EffectiveDate          = decodedJolietVd.EffectiveTime;
                    XmlFsType.EffectiveDateSpecified = true;
                }
            }
            else
            {
                XmlFsType.SystemIdentifier       = decodedVd.SystemIdentifier;
                XmlFsType.VolumeName             = decodedVd.VolumeIdentifier;
                XmlFsType.VolumeSetIdentifier    = decodedVd.VolumeSetIdentifier;
                XmlFsType.PublisherIdentifier    = decodedVd.PublisherIdentifier;
                XmlFsType.DataPreparerIdentifier = decodedVd.DataPreparerIdentifier;
                XmlFsType.ApplicationIdentifier  = decodedVd.ApplicationIdentifier;
                XmlFsType.CreationDate           = decodedVd.CreationTime;
                XmlFsType.CreationDateSpecified  = true;
                if (decodedVd.HasModificationTime)
                {
                    XmlFsType.ModificationDate          = decodedVd.ModificationTime;
                    XmlFsType.ModificationDateSpecified = true;
                }

                if (decodedVd.HasExpirationTime)
                {
                    XmlFsType.ExpirationDate          = decodedVd.ExpirationTime;
                    XmlFsType.ExpirationDateSpecified = true;
                }

                if (decodedVd.HasEffectiveTime)
                {
                    XmlFsType.EffectiveDate          = decodedVd.EffectiveTime;
                    XmlFsType.EffectiveDateSpecified = true;
                }
            }

            XmlFsType.Bootable   |= bvd != null || segaCd != null || saturn != null || dreamcast != null;
            XmlFsType.Clusters    = decodedVd.Blocks;
            XmlFsType.ClusterSize = decodedVd.BlockSize;

            information = isoMetadata.ToString();
        }
Ejemplo n.º 4
0
        public Errno Mount(IMediaImage imagePlugin, Partition partition, Encoding encoding,
                           Dictionary <string, string> options, string @namespace)
        {
            Encoding = encoding ?? Encoding.GetEncoding(1252);
            byte[] vdMagic = new byte[5]; // Volume Descriptor magic "CD001"
            byte[] hsMagic = new byte[5]; // Volume Descriptor magic "CDROM"

            if (options == null)
            {
                options = GetDefaultOptions();
            }
            if (options.TryGetValue("debug", out string debugString))
            {
                bool.TryParse(debugString, out debug);
            }
            if (options.TryGetValue("use_path_table", out string usePathTableString))
            {
                bool.TryParse(usePathTableString, out usePathTable);
            }
            if (options.TryGetValue("use_trans_tbl", out string useTransTblString))
            {
                bool.TryParse(useTransTblString, out useTransTbl);
            }
            if (options.TryGetValue("use_evd", out string useEvdString))
            {
                bool.TryParse(useEvdString, out useEvd);
            }

            // Default namespace
            if (@namespace is null)
            {
                @namespace = "joliet";
            }

            switch (@namespace.ToLowerInvariant())
            {
            case "normal":
                this.@namespace = Namespace.Normal;
                break;

            case "vms":
                this.@namespace = Namespace.Vms;
                break;

            case "joliet":
                this.@namespace = Namespace.Joliet;
                break;

            case "rrip":
                this.@namespace = Namespace.Rrip;
                break;

            case "romeo":
                this.@namespace = Namespace.Romeo;
                break;

            default: return(Errno.InvalidArgument);
            }

            PrimaryVolumeDescriptor?pvd      = null;
            PrimaryVolumeDescriptor?jolietvd = null;
            BootRecord?bvd = null;
            HighSierraPrimaryVolumeDescriptor?hsvd = null;
            FileStructureVolumeDescriptor?    fsvd = null;

            // ISO9660 is designed for 2048 bytes/sector devices
            if (imagePlugin.Info.SectorSize < 2048)
            {
                return(Errno.InvalidArgument);
            }

            // ISO9660 Primary Volume Descriptor starts at sector 16, so that's minimal size.
            if (partition.End < 16)
            {
                return(Errno.InvalidArgument);
            }

            ulong counter = 0;

            byte[] vdSector = imagePlugin.ReadSector(16 + counter + partition.Start);
            int    xaOff    = vdSector.Length == 2336 ? 8 : 0;

            Array.Copy(vdSector, 0x009 + xaOff, hsMagic, 0, 5);
            highSierra = Encoding.GetString(hsMagic) == HIGH_SIERRA_MAGIC;
            int hsOff = 0;

            if (highSierra)
            {
                hsOff = 8;
            }
            cdi = false;
            List <ulong> bvdSectors = new List <ulong>();
            List <ulong> pvdSectors = new List <ulong>();
            List <ulong> svdSectors = new List <ulong>();
            List <ulong> evdSectors = new List <ulong>();
            List <ulong> vpdSectors = new List <ulong>();

            while (true)
            {
                DicConsole.DebugWriteLine("ISO9660 plugin", "Processing VD loop no. {0}", counter);
                // Seek to Volume Descriptor
                DicConsole.DebugWriteLine("ISO9660 plugin", "Reading sector {0}", 16 + counter + partition.Start);
                byte[] vdSectorTmp = imagePlugin.ReadSector(16 + counter + partition.Start);
                vdSector = new byte[vdSectorTmp.Length - xaOff];
                Array.Copy(vdSectorTmp, xaOff, vdSector, 0, vdSector.Length);

                byte vdType = vdSector[0 + hsOff]; // Volume Descriptor Type, should be 1 or 2.
                DicConsole.DebugWriteLine("ISO9660 plugin", "VDType = {0}", vdType);

                if (vdType == 255) // Supposedly we are in the PVD.
                {
                    if (counter == 0)
                    {
                        return(Errno.InvalidArgument);
                    }

                    break;
                }

                Array.Copy(vdSector, 0x001, vdMagic, 0, 5);
                Array.Copy(vdSector, 0x009, hsMagic, 0, 5);

                if (Encoding.GetString(vdMagic) != ISO_MAGIC && Encoding.GetString(hsMagic) != HIGH_SIERRA_MAGIC &&
                    Encoding.GetString(vdMagic) != CDI_MAGIC
                    ) // Recognized, it is an ISO9660, now check for rest of data.
                {
                    if (counter == 0)
                    {
                        return(Errno.InvalidArgument);
                    }

                    break;
                }

                cdi |= Encoding.GetString(vdMagic) == CDI_MAGIC;

                switch (vdType)
                {
                case 0:
                {
                    if (debug)
                    {
                        bvdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }

                case 1:
                {
                    if (highSierra)
                    {
                        hsvd = Marshal
                               .ByteArrayToStructureLittleEndian <HighSierraPrimaryVolumeDescriptor>(vdSector);
                    }
                    else if (cdi)
                    {
                        fsvd = Marshal.ByteArrayToStructureBigEndian <FileStructureVolumeDescriptor>(vdSector);
                    }
                    else
                    {
                        pvd = Marshal.ByteArrayToStructureLittleEndian <PrimaryVolumeDescriptor>(vdSector);
                    }

                    if (debug)
                    {
                        pvdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }

                case 2:
                {
                    PrimaryVolumeDescriptor svd =
                        Marshal.ByteArrayToStructureLittleEndian <PrimaryVolumeDescriptor>(vdSector);

                    // TODO: Other escape sequences
                    // Check if this is Joliet
                    if (svd.version == 1)
                    {
                        if (svd.escape_sequences[0] == '%' && svd.escape_sequences[1] == '/')
                        {
                            if (svd.escape_sequences[2] == '@' || svd.escape_sequences[2] == 'C' ||
                                svd.escape_sequences[2] == 'E')
                            {
                                jolietvd = svd;
                            }
                            else
                            {
                                DicConsole.WriteLine("ISO9660 plugin",
                                                     "Found unknown supplementary volume descriptor");
                            }
                        }
                        if (debug)
                        {
                            svdSectors.Add(16 + counter + partition.Start);
                        }
                    }
                    else
                    {
                        if (debug)
                        {
                            evdSectors.Add(16 + counter + partition.Start);
                        }

                        if (useEvd)
                        {
                            // Basically until escape sequences are implemented, let the user chose the encoding.
                            // This is the same as user chosing Romeo namespace, but using the EVD instead of the PVD
                            this.@namespace = Namespace.Romeo;
                            pvd             = svd;
                        }
                    }

                    break;
                }

                case 3:
                {
                    if (debug)
                    {
                        vpdSectors.Add(16 + counter + partition.Start);
                    }

                    break;
                }
                }

                counter++;
            }

            DecodedVolumeDescriptor decodedVd;
            DecodedVolumeDescriptor decodedJolietVd = new DecodedVolumeDescriptor();

            XmlFsType = new FileSystemType();

            if (pvd == null && hsvd == null && fsvd == null)
            {
                DicConsole.ErrorWriteLine("ERROR: Could not find primary volume descriptor");
                return(Errno.InvalidArgument);
            }

            if (highSierra)
            {
                decodedVd = DecodeVolumeDescriptor(hsvd.Value);
            }
            else if (cdi)
            {
                decodedVd = DecodeVolumeDescriptor(fsvd.Value);
            }
            else
            {
                decodedVd = DecodeVolumeDescriptor(pvd.Value);
            }

            if (jolietvd != null)
            {
                decodedJolietVd = DecodeJolietDescriptor(jolietvd.Value);
            }

            if (this.@namespace != Namespace.Romeo)
            {
                Encoding = Encoding.ASCII;
            }

            string fsFormat;

            byte[] pathTableData;
            uint   pathTableSizeInSectors;

            uint pathTableMsbLocation;
            uint pathTableLsbLocation = 0; // Initialize to 0 as ignored in CD-i

            image = imagePlugin;

            if (highSierra)
            {
                pathTableSizeInSectors = hsvd.Value.path_table_size / 2048;
                if (hsvd.Value.path_table_size % 2048 > 0)
                {
                    pathTableSizeInSectors++;
                }

                pathTableData = ReadSectors(Swapping.Swap(hsvd.Value.mandatory_path_table_msb), pathTableSizeInSectors);

                fsFormat = "High Sierra Format";

                pathTableMsbLocation = hsvd.Value.mandatory_path_table_msb;
                pathTableLsbLocation = hsvd.Value.mandatory_path_table_lsb;
            }
            else if (cdi)
            {
                pathTableSizeInSectors = fsvd.Value.path_table_size / 2048;
                if (fsvd.Value.path_table_size % 2048 > 0)
                {
                    pathTableSizeInSectors++;
                }

                pathTableData = ReadSectors(fsvd.Value.path_table_addr, pathTableSizeInSectors);

                fsFormat = "CD-i";

                pathTableMsbLocation = fsvd.Value.path_table_addr;

                // TODO: Until escape sequences are implemented this is the default CD-i encoding.
                Encoding = Encoding.GetEncoding("iso8859-1");
            }
            else
            {
                pathTableSizeInSectors = pvd.Value.path_table_size / 2048;
                if (pvd.Value.path_table_size % 2048 > 0)
                {
                    pathTableSizeInSectors++;
                }

                pathTableData = ReadSectors(Swapping.Swap(pvd.Value.type_m_path_table), pathTableSizeInSectors);

                fsFormat = "ISO9660";

                pathTableMsbLocation = pvd.Value.type_m_path_table;
                pathTableLsbLocation = pvd.Value.type_l_path_table;
            }

            pathTable = highSierra ? DecodeHighSierraPathTable(pathTableData) : DecodePathTable(pathTableData);

            // High Sierra and CD-i do not support Joliet or RRIP
            if ((highSierra || cdi) && this.@namespace != Namespace.Normal && this.@namespace != Namespace.Vms)
            {
                this.@namespace = Namespace.Normal;
            }

            if (jolietvd is null && this.@namespace == Namespace.Joliet)
            {
                this.@namespace = Namespace.Normal;
            }

            uint rootLocation;
            uint rootSize;
            byte rootXattrLength = 0;

            if (!cdi)
            {
                rootLocation = highSierra
                                   ? hsvd.Value.root_directory_record.extent
                                   : pvd.Value.root_directory_record.extent;

                rootXattrLength = highSierra
                                      ? hsvd.Value.root_directory_record.xattr_len
                                      : pvd.Value.root_directory_record.xattr_len;

                if (highSierra)
                {
                    rootSize = hsvd.Value.root_directory_record.size / hsvd.Value.logical_block_size;
                    if (hsvd.Value.root_directory_record.size % hsvd.Value.logical_block_size > 0)
                    {
                        rootSize++;
                    }
                }
                else
                {
                    rootSize = pvd.Value.root_directory_record.size / pvd.Value.logical_block_size;
                    if (pvd.Value.root_directory_record.size % pvd.Value.logical_block_size > 0)
                    {
                        rootSize++;
                    }
                }
            }
            else
            {
                rootLocation = pathTable[0].Extent;

                byte[]             firstRootSector = ReadSectors(rootLocation, 1);
                CdiDirectoryRecord rootEntry       =
                    Marshal.ByteArrayToStructureBigEndian <CdiDirectoryRecord>(firstRootSector);
                rootSize = rootEntry.size / fsvd.Value.logical_block_size;
                if (rootEntry.size % fsvd.Value.logical_block_size > 0)
                {
                    rootSize++;
                }

                usePathTable = usePathTable || pathTable.Length == 1;
                useTransTbl  = false;
            }

            // In case the path table is incomplete
            if (usePathTable && pathTableData.Length == 1)
            {
                usePathTable = false;
            }

            if (rootLocation + rootSize >= imagePlugin.Info.Sectors)
            {
                return(Errno.InvalidArgument);
            }

            byte[] rootDir = ReadSectors(rootLocation, rootSize);

            byte[]          ipbinSector = ReadSectors(partition.Start, 1);
            CD.IPBin?       segaCd      = CD.DecodeIPBin(ipbinSector);
            Saturn.IPBin?   saturn      = Saturn.DecodeIPBin(ipbinSector);
            Dreamcast.IPBin?dreamcast   = Dreamcast.DecodeIPBin(ipbinSector);

            if (this.@namespace == Namespace.Joliet || this.@namespace == Namespace.Rrip)
            {
                usePathTable = false;
                useTransTbl  = false;
            }

            // Cannot traverse path table if we substitute the names for the ones in TRANS.TBL
            if (useTransTbl)
            {
                usePathTable = false;
            }

            if (this.@namespace != Namespace.Joliet)
            {
                rootDirectoryCache = cdi
                                         ? DecodeCdiDirectory(rootLocation, rootSize, rootXattrLength)
                                         : highSierra
                                             ? DecodeHighSierraDirectory(rootLocation, rootSize, rootXattrLength)
                                             : DecodeIsoDirectory(rootLocation, rootSize, rootXattrLength);
            }

            XmlFsType.Type = fsFormat;

            if (debug)
            {
                rootDirectoryCache.Add("$",
                                       new DecodedDirectoryEntry
                {
                    Extents =
                        new List <(uint extent, uint size)>
                    {
                        (rootLocation, (uint)rootDir.Length)
                    },
                    Filename  = "$",
                    Size      = (uint)rootDir.Length,
                    Timestamp = decodedVd.CreationTime
                });