Aaru/DiscImageChef.DiscImages/CDRDAO/Read.cs

// /***************************************************************************
// The Disc Image Chef
// ----------------------------------------------------------------------------
//
// Filename       : Read.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : Disk image plugins.
//
// --[ Description ] ----------------------------------------------------------
//
//     Reads cdrdao cuesheets (toc/bin).
//
// --[ License ] --------------------------------------------------------------
//
//     This library is free software; you can redistribute it and/or modify
//     it under the terms of the GNU Lesser General Public License as
//     published by the Free Software Foundation; either version 2.1 of the
//     License, or (at your option) any later version.
//
//     This library is distributed in the hope that it will be useful, but
//     WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
//     Lesser General Public License for more details.
//
//     You should have received a copy of the GNU Lesser General Public
//     License along with this library; if not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2019 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using DiscImageChef.Checksums;
using DiscImageChef.CommonTypes;
using DiscImageChef.CommonTypes.Enums;
using DiscImageChef.CommonTypes.Exceptions;
using DiscImageChef.CommonTypes.Interfaces;
using DiscImageChef.CommonTypes.Structs;
using DiscImageChef.Console;

namespace DiscImageChef.DiscImages
{
    public partial class Cdrdao
    {
        public bool Open(IFilter imageFilter)
        {
            if(imageFilter == null) return false;

            cdrdaoFilter = imageFilter;

            try
            {
                imageFilter.GetDataForkStream().Seek(0, SeekOrigin.Begin);
                tocStream = new StreamReader(imageFilter.GetDataForkStream());
                bool intrack = false;

                // Initialize all RegExs
                Regex regexComment         = new Regex(REGEX_COMMENT);
                Regex regexDiskType        = new Regex(REGEX_DISCTYPE);
                Regex regexMcn             = new Regex(REGEX_MCN);
                Regex regexTrack           = new Regex(REGEX_TRACK);
                Regex regexCopy            = new Regex(REGEX_COPY);
                Regex regexEmphasis        = new Regex(REGEX_EMPHASIS);
                Regex regexStereo          = new Regex(REGEX_STEREO);
                Regex regexIsrc            = new Regex(REGEX_ISRC);
                Regex regexIndex           = new Regex(REGEX_INDEX);
                Regex regexPregap          = new Regex(REGEX_PREGAP);
                Regex regexZeroPregap      = new Regex(REGEX_ZERO_PREGAP);
                Regex regexZeroData        = new Regex(REGEX_ZERO_DATA);
                Regex regexZeroAudio       = new Regex(REGEX_ZERO_AUDIO);
                Regex regexAudioFile       = new Regex(REGEX_FILE_AUDIO);
                Regex regexFile            = new Regex(REGEX_FILE_DATA);
                Regex regexTitle           = new Regex(REGEX_TITLE);
                Regex regexPerformer       = new Regex(REGEX_PERFORMER);
                Regex regexSongwriter      = new Regex(REGEX_SONGWRITER);
                Regex regexComposer        = new Regex(REGEX_COMPOSER);
                Regex regexArranger        = new Regex(REGEX_ARRANGER);
                Regex regexMessage         = new Regex(REGEX_MESSAGE);
                Regex regexDiscId          = new Regex(REGEX_DISC_ID);
                Regex regexUpc             = new Regex(REGEX_UPC);
                Regex regexCdText          = new Regex(REGEX_CD_TEXT);
                Regex regexLanguage        = new Regex(REGEX_LANGUAGE);
                Regex regexClosure         = new Regex(REGEX_CLOSURE);
                Regex regexLanguageMap     = new Regex(REGEX_LANGUAGE_MAP);
                Regex regexLanguageMapping = new Regex(REGEX_LANGUAGE_MAPPING);

                // Initialize all RegEx matches
                Match matchComment;
                Match matchDiskType;

                // Initialize disc
                discimage = new CdrdaoDisc {Tracks = new List<CdrdaoTrack>(), Comment = ""};

                CdrdaoTrack currenttrack       = new CdrdaoTrack();
                uint        currentTrackNumber = 0;
                currenttrack.Indexes = new Dictionary<int, ulong>();
                currenttrack.Pregap  = 0;
                ulong         currentSector  = 0;
                int           nextindex      = 2;
                StringBuilder commentBuilder = new StringBuilder();

                tocStream = new StreamReader(cdrdaoFilter.GetDataForkStream());
                string line;
                int    lineNumber = 0;

                while(tocStream.Peek() >= 0)
                {
                    lineNumber++;
                    line = tocStream.ReadLine();

                    matchDiskType = regexDiskType.Match(line ?? throw new InvalidOperationException());
                    matchComment  = regexComment.Match(line);

                    // Skip comments at start of file
                    if(matchComment.Success) continue;

                    if(!matchDiskType.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Not a CDRDAO TOC or TOC type not in line {0}.",
                                                  lineNumber);
                        return false;
                    }

                    break;
                }

                tocStream  = new StreamReader(cdrdaoFilter.GetDataForkStream());
                lineNumber = 0;

                tocStream.BaseStream.Position = 0;
                while(tocStream.Peek() >= 0)
                {
                    lineNumber++;
                    line = tocStream.ReadLine();

                    matchComment  = regexComment.Match(line ?? throw new InvalidOperationException());
                    matchDiskType = regexDiskType.Match(line);
                    Match matchMcn             = regexMcn.Match(line);
                    Match matchTrack           = regexTrack.Match(line);
                    Match matchCopy            = regexCopy.Match(line);
                    Match matchEmphasis        = regexEmphasis.Match(line);
                    Match matchStereo          = regexStereo.Match(line);
                    Match matchIsrc            = regexIsrc.Match(line);
                    Match matchIndex           = regexIndex.Match(line);
                    Match matchPregap          = regexPregap.Match(line);
                    Match matchZeroPregap      = regexZeroPregap.Match(line);
                    Match matchZeroData        = regexZeroData.Match(line);
                    Match matchZeroAudio       = regexZeroAudio.Match(line);
                    Match matchAudioFile       = regexAudioFile.Match(line);
                    Match matchFile            = regexFile.Match(line);
                    Match matchTitle           = regexTitle.Match(line);
                    Match matchPerformer       = regexPerformer.Match(line);
                    Match matchSongwriter      = regexSongwriter.Match(line);
                    Match matchComposer        = regexComposer.Match(line);
                    Match matchArranger        = regexArranger.Match(line);
                    Match matchMessage         = regexMessage.Match(line);
                    Match matchDiscId          = regexDiscId.Match(line);
                    Match matchUpc             = regexUpc.Match(line);
                    Match matchCdText          = regexCdText.Match(line);
                    Match matchLanguage        = regexLanguage.Match(line);
                    Match matchClosure         = regexClosure.Match(line);
                    Match matchLanguageMap     = regexLanguageMap.Match(line);
                    Match matchLanguageMapping = regexLanguageMapping.Match(line);

                    if(matchComment.Success)
                    {
                        // Ignore "// Track X" comments
                        if(matchComment.Groups["comment"].Value.StartsWith(" Track ", StringComparison.Ordinal))
                            continue;

                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found comment \"{1}\" at line {0}", lineNumber,
                                                  matchComment.Groups["comment"].Value.Trim());
                        commentBuilder.AppendLine(matchComment.Groups["comment"].Value.Trim());
                    }
                    else if(matchDiskType.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found {1} at line {0}", lineNumber,
                                                  matchDiskType.Groups["type"].Value);
                        discimage.Disktypestr = matchDiskType.Groups["type"].Value;
                        switch(matchDiskType.Groups["type"].Value)
                        {
                            case "CD_DA":
                                discimage.Disktype = MediaType.CDDA;
                                break;
                            case "CD_ROM":
                                discimage.Disktype = MediaType.CDROM;
                                break;
                            case "CD_ROM_XA":
                                discimage.Disktype = MediaType.CDROMXA;
                                break;
                            case "CD_I":
                                discimage.Disktype = MediaType.CDI;
                                break;
                            default:
                                discimage.Disktype = MediaType.CD;
                                break;
                        }
                    }
                    else if(matchMcn.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found CATALOG \"{1}\" at line {0}", lineNumber,
                                                  matchMcn.Groups["catalog"].Value);
                        discimage.Mcn = matchMcn.Groups["catalog"].Value;
                    }
                    else if(matchTrack.Success)
                    {
                        if(matchTrack.Groups["subchan"].Value == "")
                            DicConsole.DebugWriteLine("CDRDAO plugin",
                                                      "Found TRACK type \"{1}\" with no subchannel at line {0}",
                                                      lineNumber, matchTrack.Groups["type"].Value);
                        else
                            DicConsole.DebugWriteLine("CDRDAO plugin",
                                                      "Found TRACK type \"{1}\" subchannel {2} at line {0}", lineNumber,
                                                      matchTrack.Groups["type"].Value,
                                                      matchTrack.Groups["subchan"].Value);

                        if(intrack)
                        {
                            currentSector += currenttrack.Sectors;
                            if(currenttrack.Pregap != currenttrack.Sectors && !currenttrack.Indexes.ContainsKey(1))
                                currenttrack.Indexes.Add(1, currenttrack.StartSector + currenttrack.Pregap);
                            discimage.Tracks.Add(currenttrack);
                            currenttrack = new CdrdaoTrack {Indexes = new Dictionary<int, ulong>(), Pregap = 0};
                            nextindex    = 2;
                        }

                        currentTrackNumber++;
                        intrack = true;

                        switch(matchTrack.Groups["type"].Value)
                        {
                            case "AUDIO":
                            case "MODE1_RAW":
                            case "MODE2_RAW":
                                currenttrack.Bps = 2352;
                                break;
                            case "MODE1":
                            case "MODE2_FORM1":
                                currenttrack.Bps = 2048;
                                break;
                            case "MODE2_FORM2":
                                currenttrack.Bps = 2324;
                                break;
                            case "MODE2":
                            case "MODE2_FORM_MIX":
                                currenttrack.Bps = 2336;
                                break;
                            default:
                                throw new
                                    NotSupportedException($"Track mode {matchTrack.Groups["type"].Value} is unsupported");
                        }

                        switch(matchTrack.Groups["subchan"].Value)
                        {
                            case "": break;
                            case "RW":
                                currenttrack.Packedsubchannel = true;
                                goto case "RW_RAW";
                            case "RW_RAW":
                                currenttrack.Subchannel = true;
                                break;
                            default:
                                throw new
                                    NotSupportedException($"Track subchannel mode {matchTrack.Groups["subchan"].Value} is unsupported");
                        }

                        currenttrack.Tracktype = matchTrack.Groups["type"].Value;

                        currenttrack.Sequence    = currentTrackNumber;
                        currenttrack.StartSector = currentSector;
                    }
                    else if(matchCopy.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found {1} COPY at line {0}", lineNumber,
                                                  matchCopy.Groups["no"].Value);
                        currenttrack.FlagDcp |= intrack && matchCopy.Groups["no"].Value == "";
                    }
                    else if(matchEmphasis.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found {1} PRE_EMPHASIS at line {0}", lineNumber,
                                                  matchEmphasis.Groups["no"].Value);
                        currenttrack.FlagPre |= intrack && matchEmphasis.Groups["no"].Value == "";
                    }
                    else if(matchStereo.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found {1}_CHANNEL_AUDIO at line {0}", lineNumber,
                                                  matchStereo.Groups["num"].Value);
                        currenttrack.Flag_4Ch |= intrack && matchStereo.Groups["num"].Value == "FOUR";
                    }
                    else if(matchIsrc.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found ISRC \"{1}\" at line {0}", lineNumber,
                                                  matchIsrc.Groups["isrc"].Value);
                        if(intrack) currenttrack.Isrc = matchIsrc.Groups["isrc"].Value;
                    }
                    else if(matchIndex.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found INDEX \"{1}\" at line {0}", lineNumber,
                                                  matchIndex.Groups["address"].Value);

                        string[] lengthString = matchFile.Groups["length"].Value.Split(':');
                        ulong nextIndexPos = ulong.Parse(lengthString[0]) * 60 * 75 +
                                             ulong.Parse(lengthString[1])      * 75 + ulong.Parse(lengthString[2]);
                        currenttrack.Indexes.Add(nextindex,
                                                 nextIndexPos + currenttrack.Pregap + currenttrack.StartSector);
                    }
                    else if(matchPregap.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found START \"{1}\" at line {0}", lineNumber,
                                                  matchPregap.Groups["address"].Value);

                        currenttrack.Indexes.Add(0, currenttrack.StartSector);
                        if(matchPregap.Groups["address"].Value != "")
                        {
                            string[] lengthString = matchPregap.Groups["address"].Value.Split(':');
                            currenttrack.Pregap = ulong.Parse(lengthString[0]) * 60 * 75 +
                                                  ulong.Parse(lengthString[1])      * 75 + ulong.Parse(lengthString[2]);
                        }
                        else currenttrack.Pregap = currenttrack.Sectors;
                    }
                    else if(matchZeroPregap.Success)
                    {
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found PREGAP \"{1}\" at line {0}", lineNumber,
                                                  matchZeroPregap.Groups["length"].Value);
                        currenttrack.Indexes.Add(0, currenttrack.StartSector);
                        string[] lengthString = matchZeroPregap.Groups["length"].Value.Split(':');
                        currenttrack.Pregap = ulong.Parse(lengthString[0]) * 60 * 75 +
                                              ulong.Parse(lengthString[1])      * 75 + ulong.Parse(lengthString[2]);
                    }
                    else if(matchZeroData.Success)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found ZERO \"{1}\" at line {0}", lineNumber,
                                                  matchZeroData.Groups["length"].Value);
                    else if(matchZeroAudio.Success)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "Found SILENCE \"{1}\" at line {0}", lineNumber,
                                                  matchZeroAudio.Groups["length"].Value);
                    else
                    {
                        FiltersList filtersList;
                        if(matchAudioFile.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found AUDIOFILE \"{1}\" at line {0}",
                                                      lineNumber, matchAudioFile.Groups["filename"].Value);

                            filtersList = new FiltersList();
                            currenttrack.Trackfile = new CdrdaoTrackFile
                            {
                                Datafilter =
                                    filtersList.GetFilter(Path.Combine(imageFilter.GetParentFolder(),
                                                                       matchAudioFile.Groups["filename"].Value)),
                                Datafile = matchAudioFile.Groups["filename"].Value,
                                Offset = matchAudioFile.Groups["base_offset"].Value != ""
                                             ? ulong.Parse(matchAudioFile.Groups["base_offset"].Value)
                                             : 0,
                                Filetype = "BINARY",
                                Sequence = currentTrackNumber
                            };

                            ulong startSectors = 0;

                            if(matchAudioFile.Groups["start"].Value != "")
                            {
                                string[] startString = matchAudioFile.Groups["start"].Value.Split(':');
                                startSectors = ulong.Parse(startString[0]) * 60 * 75 +
                                               ulong.Parse(startString[1])      * 75 + ulong.Parse(startString[2]);
                            }

                            currenttrack.Trackfile.Offset += startSectors * currenttrack.Bps;

                            if(matchAudioFile.Groups["length"].Value != "")
                            {
                                string[] lengthString = matchAudioFile.Groups["length"].Value.Split(':');
                                currenttrack.Sectors = ulong.Parse(lengthString[0]) * 60 * 75 +
                                                       ulong.Parse(lengthString[1])      * 75 +
                                                       ulong.Parse(lengthString[2]);
                            }
                            else
                                currenttrack.Sectors =
                                    ((ulong)currenttrack.Trackfile.Datafilter.GetDataForkLength() -
                                     currenttrack.Trackfile.Offset) / currenttrack.Bps;
                        }
                        else if(matchFile.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found DATAFILE \"{1}\" at line {0}", lineNumber,
                                                      matchFile.Groups["filename"].Value);

                            filtersList = new FiltersList();
                            currenttrack.Trackfile = new CdrdaoTrackFile
                            {
                                Datafilter =
                                    filtersList.GetFilter(Path.Combine(imageFilter.GetParentFolder(),
                                                                       matchFile.Groups["filename"].Value)),
                                Datafile = matchAudioFile.Groups["filename"].Value,
                                Offset = matchFile.Groups["base_offset"].Value != ""
                                             ? ulong.Parse(matchFile.Groups["base_offset"].Value)
                                             : 0,
                                Filetype = "BINARY",
                                Sequence = currentTrackNumber
                            };

                            if(matchFile.Groups["length"].Value != "")
                            {
                                string[] lengthString = matchFile.Groups["length"].Value.Split(':');
                                currenttrack.Sectors = ulong.Parse(lengthString[0]) * 60 * 75 +
                                                       ulong.Parse(lengthString[1])      * 75 +
                                                       ulong.Parse(lengthString[2]);
                            }
                            else
                                currenttrack.Sectors =
                                    ((ulong)currenttrack.Trackfile.Datafilter.GetDataForkLength() -
                                     currenttrack.Trackfile.Offset) / currenttrack.Bps;
                        }
                        else if(matchTitle.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found TITLE \"{1}\" at line {0}", lineNumber,
                                                      matchTitle.Groups["title"].Value);
                            if(intrack) currenttrack.Title = matchTitle.Groups["title"].Value;
                            else discimage.Title           = matchTitle.Groups["title"].Value;
                        }
                        else if(matchPerformer.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found PERFORMER \"{1}\" at line {0}",
                                                      lineNumber, matchPerformer.Groups["performer"].Value);
                            if(intrack) currenttrack.Performer = matchPerformer.Groups["performer"].Value;
                            else discimage.Performer           = matchPerformer.Groups["performer"].Value;
                        }
                        else if(matchSongwriter.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found SONGWRITER \"{1}\" at line {0}",
                                                      lineNumber, matchSongwriter.Groups["songwriter"].Value);
                            if(intrack) currenttrack.Songwriter = matchSongwriter.Groups["songwriter"].Value;
                            else discimage.Songwriter           = matchSongwriter.Groups["songwriter"].Value;
                        }
                        else if(matchComposer.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found COMPOSER \"{1}\" at line {0}", lineNumber,
                                                      matchComposer.Groups["composer"].Value);
                            if(intrack) currenttrack.Composer = matchComposer.Groups["composer"].Value;
                            else discimage.Composer           = matchComposer.Groups["composer"].Value;
                        }
                        else if(matchArranger.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found ARRANGER \"{1}\" at line {0}", lineNumber,
                                                      matchArranger.Groups["arranger"].Value);
                            if(intrack) currenttrack.Arranger = matchArranger.Groups["arranger"].Value;
                            else discimage.Arranger           = matchArranger.Groups["arranger"].Value;
                        }
                        else if(matchMessage.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found MESSAGE \"{1}\" at line {0}", lineNumber,
                                                      matchMessage.Groups["message"].Value);
                            if(intrack) currenttrack.Message = matchMessage.Groups["message"].Value;
                            else discimage.Message           = matchMessage.Groups["message"].Value;
                        }
                        else if(matchDiscId.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found DISC_ID \"{1}\" at line {0}", lineNumber,
                                                      matchDiscId.Groups["discid"].Value);
                            if(!intrack) discimage.DiskId = matchDiscId.Groups["discid"].Value;
                        }
                        else if(matchUpc.Success)
                        {
                            DicConsole.DebugWriteLine("CDRDAO plugin", "Found UPC_EAN \"{1}\" at line {0}", lineNumber,
                                                      matchUpc.Groups["catalog"].Value);
                            if(!intrack) discimage.Barcode = matchUpc.Groups["catalog"].Value;
                        }
                        // Ignored fields
                        else if(matchCdText.Success      || matchLanguage.Success || matchClosure.Success ||
                                matchLanguageMap.Success || matchLanguageMapping.Success) { }
                        else if(line == "") // Empty line, ignore it
                        { }
                    }

                    // TODO: Regex CD-TEXT SIZE_INFO
                    /*
                    else // Non-empty unknown field
                    {
                        throw new FeatureUnsupportedImageException(string.Format("Found unknown field defined at line {0}: \"{1}\"", line, _line));
                    }
                    */
                }

                if(currenttrack.Sequence != 0)
                {
                    if(currenttrack.Pregap != currenttrack.Sectors && !currenttrack.Indexes.ContainsKey(1))
                        currenttrack.Indexes.Add(1, currenttrack.StartSector + currenttrack.Pregap);

                    discimage.Tracks.Add(currenttrack);
                }

                discimage.Comment = commentBuilder.ToString();

                // DEBUG information
                DicConsole.DebugWriteLine("CDRDAO plugin", "Disc image parsing results");
                DicConsole.DebugWriteLine("CDRDAO plugin", "Disc CD-TEXT:");
                if(discimage.Arranger == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tArranger is not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tArranger: {0}",
                                              discimage.Arranger);
                if(discimage.Composer == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tComposer is not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tComposer: {0}",
                                              discimage.Composer);
                if(discimage.Performer == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tPerformer is not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPerformer: {0}",
                                              discimage.Performer);
                if(discimage.Songwriter == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tSongwriter is not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tSongwriter: {0}",
                                              discimage.Songwriter);
                if(discimage.Title == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tTitle is not set.");
                else DicConsole.DebugWriteLine("CDRDAO plugin",                        "\tTitle: {0}", discimage.Title);
                DicConsole.DebugWriteLine("CDRDAO plugin", "Disc information:");
                DicConsole.DebugWriteLine("CDRDAO plugin", "\tGuessed disk type: {0}", discimage.Disktype);
                if(discimage.Barcode == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tBarcode not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tBarcode: {0}",
                                              discimage.Barcode);
                if(discimage.DiskId == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tDisc ID not set.");
                else
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tDisc ID: {0}",
                                              discimage.DiskId);
                if(discimage.Mcn == null) DicConsole.DebugWriteLine("CDRDAO plugin", "\tMCN not set.");
                else DicConsole.DebugWriteLine("CDRDAO plugin",                      "\tMCN: {0}", discimage.Mcn);
                if(string.IsNullOrEmpty(discimage.Comment))
                    DicConsole.DebugWriteLine("CDRDAO plugin",  "\tComment not set.");
                else DicConsole.DebugWriteLine("CDRDAO plugin", "\tComment: \"{0}\"", discimage.Comment);

                DicConsole.DebugWriteLine("CDRDAO plugin", "Track information:");
                DicConsole.DebugWriteLine("CDRDAO plugin", "\tDisc contains {0} tracks", discimage.Tracks.Count);
                for(int i = 0; i < discimage.Tracks.Count; i++)
                {
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tTrack {0} information:",
                                              discimage.Tracks[i].Sequence);

                    DicConsole.DebugWriteLine("CDRDAO plugin", "\t\t{0} bytes per sector", discimage.Tracks[i].Bps);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tPregap: {0} sectors",  discimage.Tracks[i].Pregap);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tData: {0} sectors starting at sector {1}",
                                              discimage.Tracks[i].Sectors, discimage.Tracks[i].StartSector);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tPostgap: {0} sectors", discimage.Tracks[i].Postgap);

                    if(discimage.Tracks[i].Flag_4Ch)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tTrack is flagged as quadraphonic");
                    if(discimage.Tracks[i].FlagDcp)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tTrack allows digital copy");
                    if(discimage.Tracks[i].FlagPre)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tTrack has pre-emphasis applied");

                    DicConsole.DebugWriteLine("CDRDAO plugin",
                                              "\t\tTrack resides in file {0}, type defined as {1}, starting at byte {2}",
                                              discimage.Tracks[i].Trackfile.Datafilter.GetFilename(),
                                              discimage.Tracks[i].Trackfile.Filetype,
                                              discimage.Tracks[i].Trackfile.Offset);

                    DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tIndexes:");
                    foreach(KeyValuePair<int, ulong> kvp in discimage.Tracks[i].Indexes)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\t\tIndex {0} starts at sector {1}", kvp.Key,
                                                  kvp.Value);

                    if(discimage.Tracks[i].Isrc == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin",  "\t\tISRC is not set.");
                    else DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tISRC: {0}", discimage.Tracks[i].Isrc);

                    if(discimage.Tracks[i].Arranger == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin",  "\t\tArranger is not set.");
                    else DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tArranger: {0}", discimage.Tracks[i].Arranger);
                    if(discimage.Tracks[i].Composer == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin",  "\t\tComposer is not set.");
                    else DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tComposer: {0}", discimage.Tracks[i].Composer);
                    if(discimage.Tracks[i].Performer == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tPerformer is not set.");
                    else
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tPerformer: {0}", discimage.Tracks[i].Performer);
                    if(discimage.Tracks[i].Songwriter == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tSongwriter is not set.");
                    else
                        DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tSongwriter: {0}",
                                                  discimage.Tracks[i].Songwriter);
                    if(discimage.Tracks[i].Title == null)
                        DicConsole.DebugWriteLine("CDRDAO plugin",  "\t\tTitle is not set.");
                    else DicConsole.DebugWriteLine("CDRDAO plugin", "\t\tTitle: {0}", discimage.Tracks[i].Title);
                }

                DicConsole.DebugWriteLine("CDRDAO plugin", "Building offset map");

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

                ulong byteOffset        = 0;
                ulong partitionSequence = 0;
                for(int i = 0; i < discimage.Tracks.Count; i++)
                {
                    ulong index0Len = 0;

                    if(discimage.Tracks[i].Sequence == 1 && i != 0)
                        throw new ImageNotSupportedException("Unordered tracks");

                    // Index 01
                    Partition partition = new Partition
                    {
                        Description = $"Track {discimage.Tracks[i].Sequence}.",
                        Name        = discimage.Tracks[i].Title,
                        Start       = discimage.Tracks[i].StartSector,
                        Size        = (discimage.Tracks[i].Sectors - index0Len) * discimage.Tracks[i].Bps,
                        Length      = discimage.Tracks[i].Sectors - index0Len,
                        Sequence    = partitionSequence,
                        Offset      = byteOffset,
                        Type        = discimage.Tracks[i].Tracktype
                    };

                    byteOffset += partition.Size;
                    partitionSequence++;

                    if(!offsetmap.ContainsKey(discimage.Tracks[i].Sequence))
                        offsetmap.Add(discimage.Tracks[i].Sequence, partition.Start);
                    else
                    {
                        offsetmap.TryGetValue(discimage.Tracks[i].Sequence, out ulong oldStart);

                        if(partition.Start < oldStart)
                        {
                            offsetmap.Remove(discimage.Tracks[i].Sequence);
                            offsetmap.Add(discimage.Tracks[i].Sequence, partition.Start);
                        }
                    }

                    Partitions.Add(partition);
                }

                // Print partition map
                DicConsole.DebugWriteLine("CDRDAO plugin", "printing partition map");
                foreach(Partition partition in Partitions)
                {
                    DicConsole.DebugWriteLine("CDRDAO plugin", "Partition sequence: {0}", partition.Sequence);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition name: {0}",   partition.Name);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition description: {0}",
                                              partition.Description);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition type: {0}",            partition.Type);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition starting sector: {0}", partition.Start);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition sectors: {0}",         partition.Length);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition starting offset: {0}", partition.Offset);
                    DicConsole.DebugWriteLine("CDRDAO plugin", "\tPartition size in bytes: {0}",   partition.Size);
                }

                foreach(CdrdaoTrack track in discimage.Tracks)
                {
                    imageInfo.ImageSize += track.Bps * track.Sectors;
                    imageInfo.Sectors   += track.Sectors;
                }

                if(discimage.Disktype != MediaType.CDG    && discimage.Disktype != MediaType.CDEG    &&
                   discimage.Disktype != MediaType.CDMIDI && discimage.Disktype != MediaType.CDROMXA &&
                   discimage.Disktype != MediaType.CDDA   && discimage.Disktype != MediaType.CDI     &&
                   discimage.Disktype != MediaType.CDPLUS) imageInfo.SectorSize = 2048; // Only data tracks
                else imageInfo.SectorSize                                       = 2352; // All others

                if(discimage.Mcn != null) imageInfo.ReadableMediaTags.Add(MediaTagType.CD_MCN);

                imageInfo.Application = "CDRDAO";

                imageInfo.CreationTime         = imageFilter.GetCreationTime();
                imageInfo.LastModificationTime = imageFilter.GetLastWriteTime();

                imageInfo.Comments          = discimage.Comment;
                imageInfo.MediaSerialNumber = discimage.Mcn;
                imageInfo.MediaBarcode      = discimage.Barcode;
                imageInfo.MediaType         = discimage.Disktype;

                imageInfo.ReadableSectorTags.Add(SectorTagType.CdTrackFlags);

                foreach(CdrdaoTrack track in discimage.Tracks)
                {
                    if(track.Subchannel)
                        if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubchannel))
                            imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubchannel);

                    switch(track.Tracktype)
                    {
                        case CDRDAO_TRACK_TYPE_AUDIO:
                        {
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdTrackIsrc))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdTrackIsrc);
                            break;
                        }
                        case CDRDAO_TRACK_TYPE_MODE2:
                        case CDRDAO_TRACK_TYPE_MODE2_MIX:
                        {
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEdc))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);
                            break;
                        }
                        case CDRDAO_TRACK_TYPE_MODE2_RAW:
                        {
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSync))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorHeader))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEdc))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);
                            break;
                        }
                        case CDRDAO_TRACK_TYPE_MODE1_RAW:
                        {
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSync))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSync);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorHeader))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorHeader);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorSubHeader))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorSubHeader);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEcc))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEcc);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEccP))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccP);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEccQ))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEccQ);
                            if(!imageInfo.ReadableSectorTags.Contains(SectorTagType.CdSectorEdc))
                                imageInfo.ReadableSectorTags.Add(SectorTagType.CdSectorEdc);
                            break;
                        }
                    }
                }

                imageInfo.XmlMediaType = XmlMediaType.OpticalDisc;

                DicConsole.VerboseWriteLine("CDRDAO image describes a disc of type {0}", imageInfo.MediaType);
                if(!string.IsNullOrEmpty(imageInfo.Comments))
                    DicConsole.VerboseWriteLine("CDRDAO comments: {0}", imageInfo.Comments);

                return true;
            }
            catch(Exception ex)
            {
                DicConsole.ErrorWriteLine("Exception trying to identify image file {0}", imageFilter);
                DicConsole.ErrorWriteLine("Exception: {0}",                              ex.Message);
                DicConsole.ErrorWriteLine("Stack trace: {0}",                            ex.StackTrace);
                return false;
            }
        }

        public byte[] ReadDiskTag(MediaTagType tag)
        {
            switch(tag)
            {
                case MediaTagType.CD_MCN:
                {
                    if(discimage.Mcn != null) return Encoding.ASCII.GetBytes(discimage.Mcn);

                    throw new FeatureNotPresentImageException("Image does not contain MCN information.");
                }
                default:
                    throw new FeatureSupportedButNotImplementedImageException("Feature not supported by image format");
            }
        }

        public byte[] ReadSector(ulong sectorAddress)
        {
            return ReadSectors(sectorAddress, 1);
        }

        public byte[] ReadSectorTag(ulong sectorAddress, SectorTagType tag)
        {
            return ReadSectorsTag(sectorAddress, 1, tag);
        }

        public byte[] ReadSector(ulong sectorAddress, uint track)
        {
            return ReadSectors(sectorAddress, 1, track);
        }

        public byte[] ReadSectorTag(ulong sectorAddress, uint track, SectorTagType tag)
        {
            return ReadSectorsTag(sectorAddress, 1, track, tag);
        }

        public byte[] ReadSectors(ulong sectorAddress, uint length)
        {
            foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
                                                     where sectorAddress >= kvp.Value
                                                     from cdrdaoTrack in discimage.Tracks
                                                     where cdrdaoTrack.Sequence      == kvp.Key
                                                     where sectorAddress - kvp.Value < cdrdaoTrack.Sectors
                                                     select kvp)
                return ReadSectors(sectorAddress - kvp.Value, length, kvp.Key);

            throw new ArgumentOutOfRangeException(nameof(sectorAddress), $"Sector address {sectorAddress} not found");
        }

        public byte[] ReadSectorsTag(ulong sectorAddress, uint length, SectorTagType tag)
        {
            foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
                                                     where sectorAddress >= kvp.Value
                                                     from cdrdaoTrack in discimage.Tracks
                                                     where cdrdaoTrack.Sequence      == kvp.Key
                                                     where sectorAddress - kvp.Value < cdrdaoTrack.Sectors
                                                     select kvp)
                return ReadSectorsTag(sectorAddress - kvp.Value, length, kvp.Key, tag);

            throw new ArgumentOutOfRangeException(nameof(sectorAddress), $"Sector address {sectorAddress} not found");
        }

        public byte[] ReadSectors(ulong sectorAddress, uint length, uint track)
        {
            CdrdaoTrack dicTrack = new CdrdaoTrack {Sequence = 0};

            foreach(CdrdaoTrack cdrdaoTrack in discimage.Tracks.Where(cdrdaoTrack => cdrdaoTrack.Sequence == track))
            {
                dicTrack = cdrdaoTrack;
                break;
            }

            if(dicTrack.Sequence == 0)
                throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");

            if(length > dicTrack.Sectors)
                throw new ArgumentOutOfRangeException(nameof(length),
                                                      "Requested more sectors than present in track, won't cross tracks");

            uint sectorOffset;
            uint sectorSize;
            uint sectorSkip;

            switch(dicTrack.Tracktype)
            {
                case CDRDAO_TRACK_TYPE_MODE1:
                case CDRDAO_TRACK_TYPE_MODE2_FORM1:
                {
                    sectorOffset = 0;
                    sectorSize   = 2048;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2_FORM2:
                {
                    sectorOffset = 0;
                    sectorSize   = 2324;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2:
                case CDRDAO_TRACK_TYPE_MODE2_MIX:
                {
                    sectorOffset = 0;
                    sectorSize   = 2336;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_AUDIO:
                {
                    sectorOffset = 0;
                    sectorSize   = 2352;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE1_RAW:
                {
                    sectorOffset = 16;
                    sectorSize   = 2048;
                    sectorSkip   = 288;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2_RAW:
                {
                    sectorOffset = 16;
                    sectorSize   = 2336;
                    sectorSkip   = 0;
                    break;
                }
                default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
            }

            if(dicTrack.Subchannel) sectorSkip += 96;

            byte[] buffer = new byte[sectorSize * length];

            imageStream = dicTrack.Trackfile.Datafilter.GetDataForkStream();
            BinaryReader br = new BinaryReader(imageStream);
            br.BaseStream
              .Seek((long)dicTrack.Trackfile.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip)),
                    SeekOrigin.Begin);
            if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * length));
            else
                for(int i = 0; i < length; i++)
                {
                    br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
                    byte[] sector = br.ReadBytes((int)sectorSize);
                    br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
                    Array.Copy(sector, 0, buffer, i * sectorSize, sectorSize);
                }

            // cdrdao audio tracks are endian swapped corresponding to DiscImageChef
            if(dicTrack.Tracktype != CDRDAO_TRACK_TYPE_AUDIO) return buffer;

            byte[] swapped = new byte[buffer.Length];
            for(long i = 0; i < buffer.Length; i += 2)
            {
                swapped[i] = buffer[i + 1];
                swapped[i             + 1] = buffer[i];
            }

            return swapped;
        }

        public byte[] ReadSectorsTag(ulong sectorAddress, uint length, uint track, SectorTagType tag)
        {
            CdrdaoTrack dicTrack = new CdrdaoTrack {Sequence = 0};

            foreach(CdrdaoTrack cdrdaoTrack in discimage.Tracks.Where(cdrdaoTrack => cdrdaoTrack.Sequence == track))
            {
                dicTrack = cdrdaoTrack;
                break;
            }

            if(dicTrack.Sequence == 0)
                throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");

            if(length > dicTrack.Sectors)
                throw new ArgumentOutOfRangeException(nameof(length),
                                                      "Requested more sectors than present in track, won't cross tracks");

            uint sectorOffset;
            uint sectorSize;
            uint sectorSkip = 0;

            if(!dicTrack.Subchannel && tag == SectorTagType.CdSectorSubchannel)
                throw new ArgumentException("No tags in image for requested track", nameof(tag));

            switch(tag)
            {
                case SectorTagType.CdSectorEcc:
                case SectorTagType.CdSectorEccP:
                case SectorTagType.CdSectorEccQ:
                case SectorTagType.CdSectorEdc:
                case SectorTagType.CdSectorHeader:
                case SectorTagType.CdSectorSubchannel:
                case SectorTagType.CdSectorSubHeader:
                case SectorTagType.CdSectorSync: break;
                case SectorTagType.CdTrackFlags:
                {
                    CdFlags flags = 0;

                    if(dicTrack.Tracktype != CDRDAO_TRACK_TYPE_AUDIO) flags |= CdFlags.DataTrack;

                    if(dicTrack.FlagDcp) flags |= CdFlags.CopyPermitted;

                    if(dicTrack.FlagPre) flags |= CdFlags.PreEmphasis;

                    if(dicTrack.Flag_4Ch) flags |= CdFlags.FourChannel;

                    return new[] {(byte)flags};
                }
                case SectorTagType.CdTrackIsrc:
                    if(dicTrack.Isrc == null) return null;

                    return Encoding.UTF8.GetBytes(dicTrack.Isrc);
                default: throw new ArgumentException("Unsupported tag requested", nameof(tag));
            }

            switch(dicTrack.Tracktype)
            {
                case CDRDAO_TRACK_TYPE_MODE1:
                case CDRDAO_TRACK_TYPE_MODE2_FORM1:
                    if(tag != SectorTagType.CdSectorSubchannel)
                        throw new ArgumentException("No tags in image for requested track", nameof(tag));

                    sectorOffset = 2048;
                    sectorSize   = 96;
                    break;
                case CDRDAO_TRACK_TYPE_MODE2_FORM2:
                case CDRDAO_TRACK_TYPE_MODE2_MIX:
                    if(tag != SectorTagType.CdSectorSubchannel)
                        throw new ArgumentException("No tags in image for requested track", nameof(tag));

                    sectorOffset = 2336;
                    sectorSize   = 96;
                    break;
                case CDRDAO_TRACK_TYPE_AUDIO:
                    if(tag != SectorTagType.CdSectorSubchannel)
                        throw new ArgumentException("No tags in image for requested track", nameof(tag));

                    sectorOffset = 2352;
                    sectorSize   = 96;
                    break;
                case CDRDAO_TRACK_TYPE_MODE1_RAW:
                {
                    switch(tag)
                    {
                        case SectorTagType.CdSectorSync:
                        {
                            sectorOffset = 0;
                            sectorSize   = 12;
                            sectorSkip   = 2340;
                            break;
                        }
                        case SectorTagType.CdSectorHeader:
                        {
                            sectorOffset = 12;
                            sectorSize   = 4;
                            sectorSkip   = 2336;
                            break;
                        }
                        case SectorTagType.CdSectorSubchannel:
                        {
                            sectorOffset = 2352;
                            sectorSize   = 96;
                            break;
                        }
                        case SectorTagType.CdSectorSubHeader:
                            throw new ArgumentException("Unsupported tag requested for this track", nameof(tag));
                        case SectorTagType.CdSectorEcc:
                        {
                            sectorOffset = 2076;
                            sectorSize   = 276;
                            sectorSkip   = 0;
                            break;
                        }
                        case SectorTagType.CdSectorEccP:
                        {
                            sectorOffset = 2076;
                            sectorSize   = 172;
                            sectorSkip   = 104;
                            break;
                        }
                        case SectorTagType.CdSectorEccQ:
                        {
                            sectorOffset = 2248;
                            sectorSize   = 104;
                            sectorSkip   = 0;
                            break;
                        }
                        case SectorTagType.CdSectorEdc:
                        {
                            sectorOffset = 2064;
                            sectorSize   = 4;
                            sectorSkip   = 284;
                            break;
                        }
                        default: throw new ArgumentException("Unsupported tag requested", nameof(tag));
                    }

                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2_RAW: // Requires reading sector
                    if(tag != SectorTagType.CdSectorSubchannel)
                        throw new FeatureSupportedButNotImplementedImageException("Feature not yet implemented");

                    sectorOffset = 2352;
                    sectorSize   = 96;
                    break;
                default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
            }

            byte[] buffer = new byte[sectorSize * length];

            imageStream = dicTrack.Trackfile.Datafilter.GetDataForkStream();
            BinaryReader br = new BinaryReader(imageStream);
            br.BaseStream
              .Seek((long)dicTrack.Trackfile.Offset + (long)(sectorAddress * (sectorOffset + sectorSize + sectorSkip)),
                    SeekOrigin.Begin);
            if(sectorOffset == 0 && sectorSkip == 0) buffer = br.ReadBytes((int)(sectorSize * length));
            else
                for(int i = 0; i < length; i++)
                {
                    br.BaseStream.Seek(sectorOffset, SeekOrigin.Current);
                    byte[] sector = br.ReadBytes((int)sectorSize);
                    br.BaseStream.Seek(sectorSkip, SeekOrigin.Current);
                    Array.Copy(sector, 0, buffer, i * sectorSize, sectorSize);
                }

            return buffer;
        }

        public byte[] ReadSectorLong(ulong sectorAddress)
        {
            return ReadSectorsLong(sectorAddress, 1);
        }

        public byte[] ReadSectorLong(ulong sectorAddress, uint track)
        {
            return ReadSectorsLong(sectorAddress, 1, track);
        }

        public byte[] ReadSectorsLong(ulong sectorAddress, uint length)
        {
            foreach(KeyValuePair<uint, ulong> kvp in from kvp in offsetmap
                                                     where sectorAddress >= kvp.Value
                                                     from cdrdaoTrack in discimage.Tracks
                                                     where cdrdaoTrack.Sequence      == kvp.Key
                                                     where sectorAddress - kvp.Value < cdrdaoTrack.Sectors
                                                     select kvp)
                return ReadSectorsLong(sectorAddress - kvp.Value, length, kvp.Key);

            throw new ArgumentOutOfRangeException(nameof(sectorAddress), "Sector address not found");
        }

        public byte[] ReadSectorsLong(ulong sectorAddress, uint length, uint track)
        {
            CdrdaoTrack dicTrack = new CdrdaoTrack {Sequence = 0};

            foreach(CdrdaoTrack cdrdaoTrack in discimage.Tracks.Where(cdrdaoTrack => cdrdaoTrack.Sequence == track))
            {
                dicTrack = cdrdaoTrack;
                break;
            }

            if(dicTrack.Sequence == 0)
                throw new ArgumentOutOfRangeException(nameof(track), "Track does not exist in disc image");

            if(length > dicTrack.Sectors)
                throw new ArgumentOutOfRangeException(nameof(length),
                                                      "Requested more sectors than present in track, won't cross tracks");

            uint sectorOffset;
            uint sectorSize;
            uint sectorSkip;

            switch(dicTrack.Tracktype)
            {
                case CDRDAO_TRACK_TYPE_MODE1:
                case CDRDAO_TRACK_TYPE_MODE2_FORM1:
                {
                    sectorOffset = 0;
                    sectorSize   = 2048;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2_FORM2:
                {
                    sectorOffset = 0;
                    sectorSize   = 2324;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE2:
                case CDRDAO_TRACK_TYPE_MODE2_MIX:
                {
                    sectorOffset = 0;
                    sectorSize   = 2336;
                    sectorSkip   = 0;
                    break;
                }
                case CDRDAO_TRACK_TYPE_MODE1_RAW:
                case CDRDAO_TRACK_TYPE_MODE2_RAW:
                case CDRDAO_TRACK_TYPE_AUDIO:
                {
                    sectorOffset = 0;
                    sectorSize   = 2352;
                    sectorSkip   = 0;
                    break;
                }
                default: throw new FeatureSupportedButNotImplementedImageException("Unsupported track type");
            }

            if(dicTrack.Subchannel) sectorSkip += 96;

            byte[] buffer = new byte[sectorSize * length];

            imageStream = dicTrack.Trackfile.Datafilter.GetDataForkStream();
            BinaryReader br = new BinaryReader(imageStream);

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

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

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

            // cdrdao audio tracks are endian swapped corresponding to DiscImageChef
            if(dicTrack.Tracktype != CDRDAO_TRACK_TYPE_AUDIO) return buffer;

            byte[] swapped = new byte[buffer.Length];
            for(long i = 0; i < buffer.Length; i += 2)
            {
                swapped[i] = buffer[i + 1];
                swapped[i             + 1] = buffer[i];
            }

            return swapped;
        }

        public List<Track> GetSessionTracks(Session session)
        {
            return GetSessionTracks(session.SessionSequence);
        }

        public List<Track> GetSessionTracks(ushort session)
        {
            if(session == 1) return Tracks;

            throw new ImageNotSupportedException("Session does not exist in disc image");
        }

        public bool? VerifySector(ulong sectorAddress)
        {
            byte[] buffer = ReadSectorLong(sectorAddress);
            return CdChecksums.CheckCdSector(buffer);
        }

        public bool? VerifySector(ulong sectorAddress, uint track)
        {
            byte[] buffer = ReadSectorLong(sectorAddress, track);
            return CdChecksums.CheckCdSector(buffer);
        }

        public bool? VerifySectors(ulong           sectorAddress, uint length, out List<ulong> failingLbas,
                                   out List<ulong> unknownLbas)
        {
            byte[] buffer = ReadSectorsLong(sectorAddress, length);
            int    bps    = (int)(buffer.Length / length);
            byte[] sector = new byte[bps];
            failingLbas = new List<ulong>();
            unknownLbas = new List<ulong>();

            for(int i = 0; i < length; i++)
            {
                Array.Copy(buffer, i * bps, sector, 0, bps);
                bool? sectorStatus = CdChecksums.CheckCdSector(sector);

                switch(sectorStatus)
                {
                    case null:
                        unknownLbas.Add((ulong)i + sectorAddress);
                        break;
                    case false:
                        failingLbas.Add((ulong)i + sectorAddress);
                        break;
                }
            }

            if(unknownLbas.Count > 0) return null;

            return failingLbas.Count <= 0;
        }

        public bool? VerifySectors(ulong           sectorAddress, uint length, uint track, out List<ulong> failingLbas,
                                   out List<ulong> unknownLbas)
        {
            byte[] buffer = ReadSectorsLong(sectorAddress, length, track);
            int    bps    = (int)(buffer.Length / length);
            byte[] sector = new byte[bps];
            failingLbas = new List<ulong>();
            unknownLbas = new List<ulong>();

            for(int i = 0; i < length; i++)
            {
                Array.Copy(buffer, i * bps, sector, 0, bps);
                bool? sectorStatus = CdChecksums.CheckCdSector(sector);

                switch(sectorStatus)
                {
                    case null:
                        unknownLbas.Add((ulong)i + sectorAddress);
                        break;
                    case false:
                        failingLbas.Add((ulong)i + sectorAddress);
                        break;
                }
            }

            if(unknownLbas.Count > 0) return null;

            return failingLbas.Count <= 0;
        }
    }
}