// /***************************************************************************
// Aaru Data Preservation Suite
// ----------------------------------------------------------------------------
//
// Filename       : Error.cs
// Author(s)      : Natalia Portillo <claunia@claunia.com>
//
// Component      : CompactDisc dumping.
//
// --[ Description ] ----------------------------------------------------------
//
//     Manages error recovering when dumping CompactDisc.
//
// --[ License ] --------------------------------------------------------------
//
//     This program is free software: you can redistribute it and/or modify
//     it under the terms of the GNU General Public License as
//     published by the Free Software Foundation, either version 3 of the
//     License, or (at your option) any later version.
//
//     This program 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 General Public License for more details.
//
//     You should have received a copy of the GNU General Public License
//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------
// Copyright © 2011-2023 Natalia Portillo
// ****************************************************************************/

using System;
using System.Collections.Generic;
using System.Linq;
using Aaru.CommonTypes.Extents;
using Aaru.CommonTypes.Interfaces;
using Aaru.CommonTypes.Structs;
using Aaru.CommonTypes.Structs.Devices.SCSI;
using Aaru.Console;
using Aaru.Core.Logging;
using Aaru.Decoders.CD;
using Aaru.Decoders.SCSI;
using Aaru.Devices;
using Schemas;
using TrackType = Aaru.CommonTypes.Enums.TrackType;

// ReSharper disable JoinDeclarationAndInitializer
// ReSharper disable InlineOutVariableDeclaration
// ReSharper disable TooWideLocalVariableScope

namespace Aaru.Core.Devices.Dumping
{
    partial class Dump
    {
        /// <summary>Retried errored sectors in CompactDisc</summary>
        /// <param name="audioExtents">Extents with audio sectors</param>
        /// <param name="blockSize">Size of the read sector in bytes</param>
        /// <param name="currentTry">Current dump hardware try</param>
        /// <param name="extents">Extents</param>
        /// <param name="offsetBytes">Read offset</param>
        /// <param name="readcd">Device supports READ CD</param>
        /// <param name="sectorsForOffset">Sectors needed to fix offset</param>
        /// <param name="subSize">Subchannel size in bytes</param>
        /// <param name="supportedSubchannel">Drive's maximum supported subchannel</param>
        /// <param name="supportsLongSectors">Supports reading EDC and ECC</param>
        /// <param name="totalDuration">Total commands duration</param>
        /// <param name="tracks">Disc tracks</param>
        /// <param name="subLog">Subchannel log</param>
        /// <param name="desiredSubchannel">Subchannel desired to save</param>
        /// <param name="isrcs">List of disc ISRCs</param>
        /// <param name="mcn">Disc media catalogue number</param>
        /// <param name="subchannelExtents">List of subchannels not yet dumped correctly</param>
        /// <param name="smallestPregapLbaPerTrack">List of smallest pregap relative address per track</param>
        void RetryCdUserData(ExtentsULong audioExtents, uint blockSize, DumpHardwareType currentTry,
                             ExtentsULong extents, int offsetBytes, bool readcd, int sectorsForOffset, uint subSize,
                             MmcSubchannel supportedSubchannel, ref double totalDuration, SubchannelLog subLog,
                             MmcSubchannel desiredSubchannel, Track[] tracks, Dictionary<byte, string> isrcs,
                             ref string mcn, HashSet<int> subchannelExtents,
                             Dictionary<byte, int> smallestPregapLbaPerTrack, bool supportsLongSectors)
        {
            bool              sense  = true;     // Sense indicator
            byte[]            cmdBuf = null;     // Data buffer
            double            cmdDuration;       // Command execution time
            const uint        sectorSize = 2352; // Full sector size
            byte[]            senseBuf   = null; // Sense buffer
            PlextorSubchannel supportedPlextorSubchannel;

            switch(supportedSubchannel)
            {
                case MmcSubchannel.None:
                    supportedPlextorSubchannel = PlextorSubchannel.None;

                    break;
                case MmcSubchannel.Raw:
                    supportedPlextorSubchannel = PlextorSubchannel.Pack;

                    break;
                case MmcSubchannel.Q16:
                    supportedPlextorSubchannel = PlextorSubchannel.Q16;

                    break;
                default:
                    supportedPlextorSubchannel = PlextorSubchannel.None;

                    break;
            }

            if(_resume.BadBlocks.Count <= 0 ||
               _aborted                     ||
               _retryPasses <= 0)
                return;

            int  pass              = 1;
            bool forward           = true;
            bool runningPersistent = false;

            Modes.ModePage? currentModePage = null;
            byte[]          md6;
            byte[]          md10;

            if(_persistent)
            {
                Modes.ModePage_01_MMC pgMmc;

                sense = _dev.ModeSense6(out cmdBuf, out _, false, ScsiModeSensePageControl.Current, 0x01, _dev.Timeout,
                                        out _);

                if(sense)
                {
                    sense = _dev.ModeSense10(out cmdBuf, out _, false, ScsiModeSensePageControl.Current, 0x01,
                                             _dev.Timeout, out _);

                    if(!sense)
                    {
                        Modes.DecodedMode? dcMode10 =
                            Modes.DecodeMode10(cmdBuf, PeripheralDeviceTypes.MultiMediaDevice);

                        if(dcMode10?.Pages != null)
                            foreach(Modes.ModePage modePage in dcMode10.Value.Pages.Where(modePage =>
                                modePage.Page == 0x01 && modePage.Subpage == 0x00))
                                currentModePage = modePage;
                    }
                }
                else
                {
                    Modes.DecodedMode? dcMode6 = Modes.DecodeMode6(cmdBuf, PeripheralDeviceTypes.MultiMediaDevice);

                    if(dcMode6?.Pages != null)
                        foreach(Modes.ModePage modePage in dcMode6.Value.Pages.Where(modePage =>
                            modePage.Page == 0x01 && modePage.Subpage == 0x00))
                            currentModePage = modePage;
                }

                if(currentModePage == null)
                {
                    pgMmc = new Modes.ModePage_01_MMC
                    {
                        PS             = false,
                        ReadRetryCount = 32,
                        Parameter      = 0x00
                    };

                    currentModePage = new Modes.ModePage
                    {
                        Page         = 0x01,
                        Subpage      = 0x00,
                        PageResponse = Modes.EncodeModePage_01_MMC(pgMmc)
                    };
                }

                pgMmc = new Modes.ModePage_01_MMC
                {
                    PS             = false,
                    ReadRetryCount = 255,
                    Parameter      = 0x20
                };

                var md = new Modes.DecodedMode
                {
                    Header = new Modes.ModeHeader(),
                    Pages = new[]
                    {
                        new Modes.ModePage
                        {
                            Page         = 0x01,
                            Subpage      = 0x00,
                            PageResponse = Modes.EncodeModePage_01_MMC(pgMmc)
                        }
                    }
                };

                md6  = Modes.EncodeMode6(md, _dev.ScsiType);
                md10 = Modes.EncodeMode10(md, _dev.ScsiType);

                UpdateStatus?.Invoke("Sending MODE SELECT to drive (return damaged blocks).");
                _dumpLog.WriteLine("Sending MODE SELECT to drive (return damaged blocks).");
                sense = _dev.ModeSelect(md6, out senseBuf, true, false, _dev.Timeout, out _);

                if(sense)
                    sense = _dev.ModeSelect10(md10, out senseBuf, true, false, _dev.Timeout, out _);

                if(sense)
                {
                    UpdateStatus?.
                        Invoke("Drive did not accept MODE SELECT command for persistent error reading, try another drive.");

                    AaruConsole.DebugWriteLine("Error: {0}", Sense.PrettifySense(senseBuf));

                    _dumpLog.WriteLine("Drive did not accept MODE SELECT command for persistent error reading, try another drive.");
                }
                else
                {
                    runningPersistent = true;
                }
            }

            InitProgress?.Invoke();
            cdRepeatRetry:
            ulong[]     tmpArray              = _resume.BadBlocks.ToArray();
            List<ulong> sectorsNotEvenPartial = new List<ulong>();

            for(int i = 0; i < tmpArray.Length; i++)
            {
                ulong badSector = tmpArray[i];

                if(_aborted)
                {
                    currentTry.Extents = ExtentsConverter.ToMetadata(extents);
                    _dumpLog.WriteLine("Aborted!");

                    break;
                }

                PulseProgress?.Invoke(string.Format("Retrying sector {0}, pass {1}, {3}{2}", badSector, pass,
                                                    forward ? "forward" : "reverse",
                                                    runningPersistent ? "recovering partial data, " : ""));

                Track track = tracks.OrderBy(t => t.TrackStartSector).
                                     LastOrDefault(t => badSector >= t.TrackStartSector);

                byte sectorsToReRead   = 1;
                uint badSectorToReRead = (uint)badSector;

                if(_fixOffset                       &&
                   audioExtents.Contains(badSector) &&
                   offsetBytes != 0)
                {
                    if(offsetBytes < 0)
                    {
                        if(badSectorToReRead == 0)
                            badSectorToReRead = uint.MaxValue - (uint)(sectorsForOffset - 1); // -1
                        else
                            badSectorToReRead -= (uint)sectorsForOffset;
                    }

                    sectorsToReRead += (byte)sectorsForOffset;
                }

                if(_supportsPlextorD8 && audioExtents.Contains(badSector))
                {
                    sense = ReadPlextorWithSubchannel(out cmdBuf, out senseBuf, badSectorToReRead, blockSize,
                                                      sectorsToReRead, supportedPlextorSubchannel, out cmdDuration);

                    totalDuration += cmdDuration;
                }
                else if(readcd)
                {
                    if(audioExtents.Contains(badSector))
                    {
                        sense = _dev.ReadCd(out cmdBuf, out senseBuf, badSectorToReRead, blockSize, sectorsToReRead,
                                            MmcSectorTypes.Cdda, false, false, false, MmcHeaderCodes.None, true, false,
                                            MmcErrorField.None, supportedSubchannel, _dev.Timeout, out cmdDuration);

                        if(sense)
                        {
                            DecodedSense? decSense = Sense.Decode(senseBuf);

                            // Try to workaround firmware
                            if((decSense?.ASC == 0x11 && decSense?.ASCQ == 0x05) ||
                               decSense?.ASC == 0x64)
                            {
                                sense = _dev.ReadCd(out cmdBuf, out _, badSectorToReRead, blockSize, sectorsToReRead,
                                                    MmcSectorTypes.AllTypes, false, false, true,
                                                    MmcHeaderCodes.AllHeaders, true, true, MmcErrorField.None,
                                                    supportedSubchannel, _dev.Timeout, out double cmdDuration2);

                                cmdDuration += cmdDuration2;
                            }
                        }
                    }
                    else
                    {
                        sense = _dev.ReadCd(out cmdBuf, out senseBuf, badSectorToReRead, blockSize, sectorsToReRead,
                                            MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders,
                                            true, true, MmcErrorField.None, supportedSubchannel, _dev.Timeout,
                                            out cmdDuration);

                        if(sense)
                        {
                            DecodedSense? decSense = Sense.Decode(senseBuf);

                            // Try to workaround firmware
                            if((decSense?.ASC == 0x11 && decSense?.ASCQ == 0x05) ||
                               decSense?.ASC == 0x64)
                            {
                                sense = _dev.ReadCd(out cmdBuf, out _, badSectorToReRead, blockSize, sectorsToReRead,
                                                    MmcSectorTypes.Cdda, false, false, false, MmcHeaderCodes.None, true,
                                                    false, MmcErrorField.None, supportedSubchannel, _dev.Timeout,
                                                    out double cmdDuration2);

                                cmdDuration += cmdDuration2;
                            }
                        }
                    }

                    totalDuration += cmdDuration;
                }

                if(sense || _dev.Error)
                {
                    _errorLog?.WriteLine(badSector, _dev.Error, _dev.LastError, senseBuf);

                    if(!runningPersistent)
                        continue;

                    DecodedSense? decSense = Sense.Decode(senseBuf);

                    // MEDIUM ERROR, retry with ignore error below
                    if(decSense is { ASC: 0x11 })
                        if(!sectorsNotEvenPartial.Contains(badSector))
                            sectorsNotEvenPartial.Add(badSector);
                }

                // Because one block has been partially used to fix the offset
                if(_fixOffset                       &&
                   audioExtents.Contains(badSector) &&
                   offsetBytes != 0)
                {
                    uint blocksToRead = sectorsToReRead;

                    FixOffsetData(offsetBytes, sectorSize, sectorsForOffset, supportedSubchannel, ref blocksToRead,
                                  subSize, ref cmdBuf, blockSize, false);
                }

                if(!sense &&
                   !_dev.Error)
                {
                    _resume.BadBlocks.Remove(badSector);
                    extents.Add(badSector);
                    UpdateStatus?.Invoke($"Correctly retried sector {badSector} in pass {pass}.");
                    _dumpLog.WriteLine("Correctly retried sector {0} in pass {1}.", badSector, pass);
                    sectorsNotEvenPartial.Remove(badSector);
                }
                else
                    _errorLog?.WriteLine(badSector, _dev.Error, _dev.LastError, senseBuf);

                if(supportedSubchannel != MmcSubchannel.None)
                {
                    byte[] data = new byte[sectorSize];
                    byte[] sub  = new byte[subSize];
                    Array.Copy(cmdBuf, 0, data, 0, sectorSize);
                    Array.Copy(cmdBuf, sectorSize, sub, 0, subSize);

                    if(supportsLongSectors)
                        _outputPlugin.WriteSectorLong(data, badSector);
                    else
                        _outputPlugin.WriteSector(Sector.GetUserData(data), badSector);

                    bool indexesChanged = Media.CompactDisc.WriteSubchannelToImage(supportedSubchannel,
                        desiredSubchannel, sub, badSector, 1, subLog, isrcs, (byte)track.TrackSequence, ref mcn,
                        tracks, subchannelExtents, _fixSubchannelPosition, _outputPlugin, _fixSubchannel,
                        _fixSubchannelCrc, _dumpLog, UpdateStatus, smallestPregapLbaPerTrack, true, out _);

                    // Set tracks and go back
                    if(!indexesChanged)
                        continue;

                    (_outputPlugin as IWritableOpticalImage).SetTracks(tracks.ToList());
                    i--;
                }
                else
                {
                    if(supportsLongSectors)
                        _outputPlugin.WriteSectorLong(cmdBuf, badSector);
                    else
                        _outputPlugin.WriteSector(Sector.GetUserData(cmdBuf), badSector);
                }
            }

            if(pass < _retryPasses &&
               !_aborted           &&
               _resume.BadBlocks.Count > 0)
            {
                pass++;
                forward = !forward;
                _resume.BadBlocks.Sort();

                if(!forward)
                    _resume.BadBlocks.Reverse();

                goto cdRepeatRetry;
            }

            EndProgress?.Invoke();

            // TODO: Enable when underlying images support lead-outs
            /*
                RetryCdLeadOuts(blocks, blockSize, ref currentSpeed, currentTry, extents, ibgLog, ref imageWriteDuration,
                       leadOutExtents, ref maxSpeed, mhddLog, ref minSpeed, read6, read10, read12, read16, readcd,
                       supportedSubchannel, subSize, ref totalDuration);
                */

            // Try to ignore read errors, on some drives this allows to recover partial even if damaged data
            if(_persistent && sectorsNotEvenPartial.Count > 0)
            {
                var pgMmc = new Modes.ModePage_01_MMC
                {
                    PS             = false,
                    ReadRetryCount = 255,
                    Parameter      = 0x01
                };

                var md = new Modes.DecodedMode
                {
                    Header = new Modes.ModeHeader(),
                    Pages = new[]
                    {
                        new Modes.ModePage
                        {
                            Page         = 0x01,
                            Subpage      = 0x00,
                            PageResponse = Modes.EncodeModePage_01_MMC(pgMmc)
                        }
                    }
                };

                md6  = Modes.EncodeMode6(md, _dev.ScsiType);
                md10 = Modes.EncodeMode10(md, _dev.ScsiType);

                _dumpLog.WriteLine("Sending MODE SELECT to drive (ignore error correction).");
                sense = _dev.ModeSelect(md6, out senseBuf, true, false, _dev.Timeout, out _);

                if(sense)
                    sense = _dev.ModeSelect10(md10, out senseBuf, true, false, _dev.Timeout, out _);

                if(!sense)
                {
                    runningPersistent = true;

                    InitProgress?.Invoke();

                    for(int i = 0; i < sectorsNotEvenPartial.Count; i++)
                    {
                        ulong badSector = sectorsNotEvenPartial[i];

                        if(_aborted)
                        {
                            currentTry.Extents = ExtentsConverter.ToMetadata(extents);
                            _dumpLog.WriteLine("Aborted!");

                            break;
                        }

                        PulseProgress?.Invoke($"Trying to get partial data for sector {badSector}");

                        Track track = tracks.OrderBy(t => t.TrackStartSector).
                                             LastOrDefault(t => badSector >= t.TrackStartSector);

                        if(readcd)
                        {
                            sense = _dev.ReadCd(out cmdBuf, out senseBuf, (uint)badSector, blockSize, 1,
                                                MmcSectorTypes.AllTypes, false, false, true, MmcHeaderCodes.AllHeaders,
                                                true, true, MmcErrorField.None, supportedSubchannel, _dev.Timeout,
                                                out cmdDuration);

                            totalDuration += cmdDuration;
                        }

                        if(sense || _dev.Error)
                        {
                            _errorLog?.WriteLine(badSector, _dev.Error, _dev.LastError, senseBuf);

                            continue;
                        }

                        _dumpLog.WriteLine("Got partial data for sector {0} in pass {1}.", badSector, pass);

                        if(supportedSubchannel != MmcSubchannel.None)
                        {
                            byte[] data = new byte[sectorSize];
                            byte[] sub  = new byte[subSize];
                            Array.Copy(cmdBuf, 0, data, 0, sectorSize);
                            Array.Copy(cmdBuf, sectorSize, sub, 0, subSize);

                            if(supportsLongSectors)
                                _outputPlugin.WriteSectorLong(data, badSector);
                            else
                                _outputPlugin.WriteSector(Sector.GetUserData(data), badSector);

                            bool indexesChanged = Media.CompactDisc.WriteSubchannelToImage(supportedSubchannel,
                                desiredSubchannel, sub, badSector, 1, subLog, isrcs, (byte)track.TrackSequence,
                                ref mcn, tracks, subchannelExtents, _fixSubchannelPosition, _outputPlugin,
                                _fixSubchannel, _fixSubchannelCrc, _dumpLog, UpdateStatus,
                                smallestPregapLbaPerTrack, true, out _);

                            // Set tracks and go back
                            if(indexesChanged)
                            {
                                (_outputPlugin as IWritableOpticalImage).SetTracks(tracks.ToList());
                                i--;
                            }
                        }
                        else
                        {
                            if(supportsLongSectors)
                                _outputPlugin.WriteSectorLong(cmdBuf, badSector);
                            else
                                _outputPlugin.WriteSector(Sector.GetUserData(cmdBuf), badSector);
                        }
                    }

                    EndProgress?.Invoke();
                }
            }

            if(runningPersistent && currentModePage.HasValue)
            {
                var md = new Modes.DecodedMode
                {
                    Header = new Modes.ModeHeader(),
                    Pages = new[]
                    {
                        currentModePage.Value
                    }
                };

                md6  = Modes.EncodeMode6(md, _dev.ScsiType);
                md10 = Modes.EncodeMode10(md, _dev.ScsiType);

                _dumpLog.WriteLine("Sending MODE SELECT to drive (return device to previous status).");
                sense = _dev.ModeSelect(md6, out senseBuf, true, false, _dev.Timeout, out _);

                if(sense)
                    _dev.ModeSelect10(md10, out senseBuf, true, false, _dev.Timeout, out _);
            }

            EndProgress?.Invoke();
        }

        /// <summary>Retried errored subchannels in CompactDisc</summary>
        /// <param name="readcd">Device supports READ CD</param>
        /// <param name="subSize">Subchannel size in bytes</param>
        /// <param name="supportedSubchannel">Drive's maximum supported subchannel</param>
        /// <param name="totalDuration">Total commands duration</param>
        /// <param name="tracks">Disc tracks</param>
        /// <param name="subLog">Subchannel log</param>
        /// <param name="desiredSubchannel">Subchannel desired to save</param>
        /// <param name="isrcs">List of disc ISRCs</param>
        /// <param name="mcn">Disc media catalogue number</param>
        /// <param name="subchannelExtents">List of subchannels not yet dumped correctly</param>
        /// <param name="smallestPregapLbaPerTrack">List of smallest pregap relative address per track</param>
        void RetrySubchannel(bool readcd, uint subSize, MmcSubchannel supportedSubchannel, ref double totalDuration,
                             SubchannelLog subLog, MmcSubchannel desiredSubchannel, Track[] tracks,
                             Dictionary<byte, string> isrcs, ref string mcn, HashSet<int> subchannelExtents,
                             Dictionary<byte, int> smallestPregapLbaPerTrack)
        {
            bool              sense  = true;   // Sense indicator
            byte[]            cmdBuf = null;   // Data buffer
            double            cmdDuration;     // Command execution time
            byte[]            senseBuf = null; // Sense buffer
            PlextorSubchannel supportedPlextorSubchannel;

            if(supportedSubchannel == MmcSubchannel.None ||
               desiredSubchannel   == MmcSubchannel.None)
                return;

            switch(supportedSubchannel)
            {
                case MmcSubchannel.None:
                    supportedPlextorSubchannel = PlextorSubchannel.None;

                    break;
                case MmcSubchannel.Raw:
                    supportedPlextorSubchannel = PlextorSubchannel.All;

                    break;
                case MmcSubchannel.Q16:
                    supportedPlextorSubchannel = PlextorSubchannel.Q16;

                    break;
                case MmcSubchannel.Rw:
                    supportedPlextorSubchannel = PlextorSubchannel.Pack;

                    break;
                default:
                    supportedPlextorSubchannel = PlextorSubchannel.None;

                    break;
            }

            if(_aborted)
                return;

            int  pass    = 1;
            bool forward = true;

            InitProgress?.Invoke();

            cdRepeatRetry:

            _resume.BadSubchannels = new List<int>();
            _resume.BadSubchannels.AddRange(subchannelExtents);
            _resume.BadSubchannels.Sort();

            if(!forward)
                _resume.BadSubchannels.Reverse();

            int[] tmpArray = _resume.BadSubchannels.ToArray();

            foreach(int bs in tmpArray)
            {
                uint badSector = (uint)bs;

                Track track = tracks.OrderBy(t => t.TrackStartSector).
                                     LastOrDefault(t => badSector >= t.TrackStartSector);

                if(_aborted)
                {
                    _dumpLog.WriteLine("Aborted!");

                    break;
                }

                PulseProgress?.
                    Invoke($"Retrying sector {badSector} subchannel, pass {pass}, {(forward ? "forward" : "reverse")}");

                uint startSector = badSector - 2;

                if(_supportsPlextorD8)
                {
                    sense = _dev.PlextorReadCdDa(out cmdBuf, out senseBuf, startSector, subSize, 5,
                                                 supportedPlextorSubchannel, 0, out cmdDuration);

                    totalDuration += cmdDuration;
                }
                else if(readcd)
                {
                    sense = _dev.ReadCd(out cmdBuf, out senseBuf, startSector, subSize, 5,
                                        track.TrackType == TrackType.Audio ? MmcSectorTypes.Cdda
                                            : MmcSectorTypes.AllTypes, false, false, false, MmcHeaderCodes.None, false,
                                        false, MmcErrorField.None, supportedSubchannel, _dev.Timeout, out cmdDuration);

                    totalDuration += cmdDuration;
                }

                if(sense || _dev.Error)
                {
                    _errorLog?.WriteLine(badSector, _dev.Error, _dev.LastError, senseBuf);

                    continue;
                }

                Media.CompactDisc.WriteSubchannelToImage(supportedSubchannel, desiredSubchannel, cmdBuf, badSector, 5,
                                                         subLog, isrcs, (byte)track.TrackSequence, ref mcn, tracks,
                                                         subchannelExtents, _fixSubchannelPosition, _outputPlugin,
                                                         _fixSubchannel, _fixSubchannelCrc, _dumpLog, UpdateStatus,
                                                         smallestPregapLbaPerTrack, true, out _);

                if(subchannelExtents.Contains(bs))
                    continue;

                UpdateStatus?.Invoke($"Correctly retried sector {badSector} subchannel in pass {pass}.");
                _dumpLog.WriteLine("Correctly retried sector {0} subchannel in pass {1}.", badSector, pass);
            }

            if(pass < _retryPasses &&
               !_aborted           &&
               subchannelExtents.Count > 0)
            {
                pass++;
                forward = !forward;

                goto cdRepeatRetry;
            }

            EndProgress?.Invoke();
        }
    }
}