- function to remove backup files (so that a new backup will be generated)

- remember last directory in FileOpenDialog, even when opening the file failed - HDD Hex Editor Neo file structure definition - improvements for Panasonic LS/LX serializer
2026-02-19 04:46:45 +01:00 · 2022-10-05 18:03:12 +02:00
parent 391a9f3872
commit e582cb95b7
6 changed files with 202 additions and 65 deletions
--- a/source/ChanSort.Loader.Panasonic/IdtvChannelSerializer.cs
+++ b/source/ChanSort.Loader.Panasonic/IdtvChannelSerializer.cs
@@ -4,6 +4,7 @@ using System.IO;
 using System.Runtime.InteropServices;
 using System.Security.Cryptography;
 using System.Text;
+using System.Xml.Linq;
 using ChanSort.Api;
 using Microsoft.Data.Sqlite;

@@ -39,29 +40,35 @@ internal class IdtvChannelSerializer : SerializerBase
    Encrypted = 0x0002,
    IsFavorite = 0x0080,
    Deleted = 0x0100,
-    Hidden = 0x0400
+    Skip = 0x0400,
+    CustomProgNr = 0x1000
  }

-  [StructLayout(LayoutKind.Sequential)]
+  [StructLayout(LayoutKind.Sequential,Pack=1)]
  unsafe struct IdtvChannel
  {
    public short U0; // always 1
    public short RecordLength; // 60 + length of channel name
    public short U4; // always 6
-    public fixed byte U6[10]; // all 00
+    public fixed byte U6[3]; // all 00
+    public ushort U9; // 0 = sat, 18 = cable ?
+    public fixed byte U11[5]; // all 00
    public uint Freq; // Hz for DVB-C/T, kHz for DVB-S
    public uint SymRate; // in Sym/s, like 22000000
    public short U24; // always 100
    public short U26; // always 0
    public short U28; // always 0
    public short ProgNr;
-    public fixed byte U32[4]; // e.g. 0a 01 00 00
+    public short Lcn; // maybe?
+    public fixed byte U32[2]; // e.g. 0a 01 00 00
    public Flags Flags;
    public fixed byte U38[4]; // 12 07 01 02
    public short Tsid;
    public short Onid;
    public short Sid;
-    public fixed byte U48[16];
+    public fixed byte U48[4];
+    public uint InternalProviderFlag2; // seems like all sat channels are in the 20000-29999 range, dvb-c in 30000-39999
+    public fixed byte U56[8];
    //public fixed byte ChannelName[RecordLength - 60]; // pseudo-C# description of variable length channel name UTF8 data at end of structure
  }

@@ -70,18 +77,21 @@ internal class IdtvChannelSerializer : SerializerBase
  private readonly string dbFile;
  private readonly string binFile;
  private Dictionary<int, ChannelInfo> channelDict = new(); // maps record-index of .bin file to Channel object created from .db file
+  private byte[] binFileData;
  private List<int> binFileRecordOffsets = new();

  private readonly StringBuilder log = new();

  #region ctor()
-  public IdtvChannelSerializer(string inputFile) : base(inputFile)
+  public IdtvChannelSerializer(string hotelBin) : base(hotelBin)
  {
-    dbFile = inputFile;
-    binFile = Path.Combine(Path.GetDirectoryName(dbFile), "channel", "idtvChannel.bin");
+    var dir = Path.Combine(Path.GetDirectoryName(hotelBin), "mnt/vendor/tvdata/database");
+    dbFile = Path.Combine(dir, "tv.db");
+    binFile = Path.Combine(dir, "channel", "idtvChannel.bin");

    this.Features.CanSaveAs = false;
    this.Features.FavoritesMode = FavoritesMode.Flags;
+    this.Features.DeleteMode = DeleteMode.FlagWithPrNr;

    this.DataRoot.AddChannelList(new ChannelList(SignalSource.Antenna | SignalSource.MaskTvRadioData, "Antenna"));
    this.DataRoot.AddChannelList(new ChannelList(SignalSource.Cable | SignalSource.MaskTvRadioData, "Cable"));
@@ -89,6 +99,7 @@ internal class IdtvChannelSerializer : SerializerBase
    foreach (var list in this.DataRoot.ChannelLists)
    {
      var names = list.VisibleColumnFieldNames;
+      names.Remove(nameof(ChannelInfo.Hidden)); // the TV's "hide" function actually works like "skip", only removing it from zapping, but allowing direct number input
      names.Remove(nameof(ChannelInfo.ShortName));
      names.Remove(nameof(ChannelInfo.Satellite));
      names.Remove(nameof(ChannelInfo.PcrPid));
@@ -178,8 +189,8 @@ internal class IdtvChannelSerializer : SerializerBase
      ch.Hidden = !r.GetBoolean(cols["searchable"]);
      ch.Encrypted = r.GetBoolean(cols["scrambled"]);

-      ch.OriginalNetworkId = r.GetInt16(cols["original_network_id"]);
-      ch.TransportStreamId = r.GetInt16(cols["transport_stream_id"]);
+      ch.OriginalNetworkId = r.GetInt32(cols["original_network_id"]);
+      ch.TransportStreamId = r.GetInt32(cols["transport_stream_id"]);
      ch.ServiceId = r.GetInt32(cols["service_id"]);
      ch.FreqInMhz = r.GetInt64(cols["internal_provider_flag1"]) / 1000; // for DVB-S it is in MHz, for DVB-C/T it is in kHz
      if (ch.FreqInMhz >= 13000)
@@ -197,6 +208,9 @@ internal class IdtvChannelSerializer : SerializerBase
      var list = this.DataRoot.GetChannelList(signalSource);
      this.DataRoot.AddChannel(list, ch);

+      if (channelDict.TryGetValue(ch.RecordOrder, out var otherChannel))
+        throw new FileLoadException($"tv.db channel _ids {otherChannel.RecordIndex} ({otherChannel.Name}) and {ch.RecordIndex} ({ch.Name}) both reference same idtvChannel.bin record {ch.RecordOrder}\n"+ 
+                                    "Please make sure to search satellite channels first and cable/antenna afterwards.");
      channelDict.Add(ch.RecordOrder, ch);
    }
  }
@@ -205,19 +219,19 @@ internal class IdtvChannelSerializer : SerializerBase
  #region ReadIdtvChannelsBin()
  private void ReadIdtvChannelsBin()
  {
+    this.binFileData = File.ReadAllBytes(this.binFile);
+
    // verify MD5 checksum
-    var data = File.ReadAllBytes(this.binFile);
    var md5 = MD5.Create();
-    var hash = md5.ComputeHash(data, 24, data.Length - 24);
+    var hash = md5.ComputeHash(binFileData, 24, binFileData.Length - 24);
    int i;
    for (i = 0; i < 16; i++)
    {
-      if (data[8 + i] != hash[i])
+      if (binFileData[8 + i] != hash[i])
        throw new FileLoadException("Invalid MD5 checksum in " + binFile);
    }

-
-    using var strm = new MemoryStream(data);
+    using var strm = new MemoryStream(binFileData);
    using var r = new BinaryReader(strm);

    r.ReadBytes(2 + 2); // 00 00, 4b 09
@@ -226,8 +240,10 @@ internal class IdtvChannelSerializer : SerializerBase
    r.ReadBytes(16); // md5
    i = 0;

+    log.AppendLine($"#\tname\tprogNr\tonid-tsid-sid\tflags\tlcn\tipf2");
+
    var structSize = Marshal.SizeOf<IdtvChannel>();
-    while (strm.Position + structSize <= data.Length)
+    while (strm.Position + structSize <= binFileData.Length)
    {
      var off = strm.Position;
      binFileRecordOffsets.Add((int)off);
@@ -245,7 +261,7 @@ internal class IdtvChannelSerializer : SerializerBase
      var progNr = chan.ProgNr;
      var name = Encoding.UTF8.GetString(r.ReadBytes(chan.RecordLength - 60));

-      log.AppendLine($"{i}\t{name}\t{progNr}\t{chan.Onid}-{chan.Tsid}-{chan.Sid}\t{(ushort)chan.Flags:X4}");
+      log.AppendLine($"{i}\t{name}\t{progNr}\t{chan.Onid}-{chan.Tsid}-{chan.Sid}\t{(ushort)chan.Flags:X4}\t{chan.Lcn}\t{chan.InternalProviderFlag2}");

      if (channelDict.TryGetValue(i, out var ch))
      {
@@ -260,8 +276,8 @@ internal class IdtvChannelSerializer : SerializerBase

        if (ch.Encrypted != ((chan.Flags & Flags.Encrypted) != 0))
          throw new FileLoadException($"mismatching crypt-flag between tv.db _id {ch.RecordIndex} ({ch.Encrypted}) and idtvChannel.bin record {i}");
-        if (ch.Hidden != ((chan.Flags & Flags.Hidden) != 0))
-          throw new FileLoadException($"mismatching hide-flag between tv.db _id {ch.RecordIndex} ({ch.Hidden}) and idtvChannel.bin record {i}");
+        if (ch.Skip != ((chan.Flags & Flags.Skip) != 0))
+          throw new FileLoadException($"mismatching browsable-flag between tv.db _id {ch.RecordIndex} ({ch.Skip}) and idtvChannel.bin record {i}");
        if ((ch.Favorites == 0) != ((chan.Flags & Flags.IsFavorite) == 0))
          throw new FileLoadException($"mismatching favorites-info between tv.db _id {ch.RecordIndex} ({ch.Favorites}) and idtvChannel.bin record {i}");

@@ -292,9 +308,9 @@ internal class IdtvChannelSerializer : SerializerBase
  public override void Save(string tvOutputFile)
  {
    // saving the list requires to:
-    // - physically reorder the .bin file and update fields inside the data records
+    // - update fields inside the data records and physically reorder the records
    // - updating records in the .db file
-    // - updating this loaders internal data in channelDict, binFileRecordOffsets and channelInfo.RecordOrder for consecutive save operations to work
+    // - updating all channel record indexes in this loader's internal data in channelDict, binFileRecordOffsets and channelInfo.RecordOrder for consecutive save operations to work

    GetNewIdtvChannelBinRecordOrder(out var newToOld, out var oldToNew);

@@ -310,8 +326,17 @@ internal class IdtvChannelSerializer : SerializerBase
    newToOld = new List<int>(binFileRecordOffsets.Count);
    for (int i = 0, c=this.binFileRecordOffsets.Count; i<c; i++)
      newToOld.Add(i);
+
+    var offFreq = (int)Marshal.OffsetOf<IdtvChannel>(nameof(IdtvChannel.Freq));
    newToOld.Sort((a, b) =>
    {
+      // all sat channels must come first before cable/antenna channels
+      var freq1 = BitConverter.ToUInt32(this.binFileData, binFileRecordOffsets[a] + offFreq);
+      var freq2 = BitConverter.ToUInt32(this.binFileData, binFileRecordOffsets[b] + offFreq);
+      var c = (freq1 < 14000000 ? 0 : 1).CompareTo(freq2 < 14000000 ? 0 : 1); // hack: Sat has values below 14 000 000 (in kHz), Cable/antenna above (in Hz)
+      if (c != 0)
+        return c;
+
      this.channelDict.TryGetValue(a, out var ch1);
      this.channelDict.TryGetValue(b, out var ch2);
      if (ch1 == null && ch2 == null)
@@ -321,7 +346,7 @@ internal class IdtvChannelSerializer : SerializerBase
      if (ch1 == null)
        return +1;

-      var c = ch1.SignalSource.CompareTo(ch2.SignalSource); // group by DVB-C/T/S and TV/Radio/Data
+      c = ((int)ch1.SignalSource).CompareTo((int)ch2.SignalSource); // group TV/Radio/Data
      if (c != 0)
        return c;
      c = ch1.NewProgramNr.CompareTo(ch2.NewProgramNr);
@@ -341,64 +366,70 @@ internal class IdtvChannelSerializer : SerializerBase
  #region SaveIdtvChannelBin()
  private void SaveIdtvChannelBin(IList<int> newToOld)
  {
-    var data = UpdateIdtvChannelBinRecords();
-
-    data = ReorderBinFileRecords(data, newToOld);
+    UpdateIdtvChannelBinRecords();
+    ReorderBinFileRecords(newToOld);

    // update MD5 checksum
    var md5 = MD5.Create();
-    var checksum = md5.ComputeHash(data, 8 + 16, data.Length - 8 - 16);
-    Array.Copy(checksum, 0, data, 8, 16);
+    var checksum = md5.ComputeHash(binFileData, 8 + 16, binFileData.Length - 8 - 16);
+    Array.Copy(checksum, 0, binFileData, 8, 16);

-    File.WriteAllBytes(binFile, data);
+    File.WriteAllBytes(binFile, binFileData);
  }
  #endregion
  
  #region UpdateIdtvChannelBinRecords()
-  private byte[] UpdateIdtvChannelBinRecords()
+  private void UpdateIdtvChannelBinRecords()
  {
    // in-place update of the old .bin file data

    var offProgNr = (int)Marshal.OffsetOf<IdtvChannel>(nameof(IdtvChannel.ProgNr));
    var offFlags = (int)Marshal.OffsetOf<IdtvChannel>(nameof(IdtvChannel.Flags));

-    var data = File.ReadAllBytes(this.binFile);
-    var w = new BinaryWriter(new MemoryStream(data));
+    var w = new BinaryWriter(new MemoryStream(this.binFileData));

    foreach (var list in this.DataRoot.ChannelLists)
    {
      foreach (var ch in list.Channels)
      {
+        if (ch.IsProxy)
+          continue;
        var filePosition = this.binFileRecordOffsets[ch.RecordOrder];
        w.Seek(filePosition + offProgNr, SeekOrigin.Begin);
-        w.Write((ushort)ch.NewProgramNr);
+        //w.Write(ch.NewProgramNr > 0 ? (ushort)ch.NewProgramNr : (ushort)0xFFFE); // deleted channels have -2 / 0xFFFE
+        w.Write(ch.NewProgramNr);


        // update flags
        var off = filePosition + offFlags;
-        var flags = BitConverter.ToUInt16(data, off);
+        var flags = BitConverter.ToUInt16(this.binFileData, off);
        if (ch.Favorites == 0)
          flags = (ushort)(flags & ~(ushort)Flags.IsFavorite);
        else
          flags = (ushort)(flags | (ushort)Flags.IsFavorite);
-        if (ch.Hidden)
-          flags = (ushort)(flags | (ushort)Flags.Hidden);
+        
+        if (ch.Skip)
+          flags = (ushort)(flags | (ushort)Flags.Skip);
        else
-          flags = (ushort)(flags & ~(ushort)Flags.Hidden);
+          flags = (ushort)(flags & ~(ushort)Flags.Skip);
+
+        if (ch.IsDeleted)
+          flags |= (ushort)Flags.Deleted;
+
+        flags |= (ushort)Flags.CustomProgNr;
        w.Seek(filePosition + offFlags, SeekOrigin.Begin);
        w.Write(flags);
      }
    }

    w.Flush();
-    return data;
  }
  #endregion

  #region ReorderBinFileRecords()
-  private byte[] ReorderBinFileRecords(byte[] binFileData, IList<int> newToOld)
+  private void ReorderBinFileRecords(IList<int> newToOld)
  {
-    using var mem = new MemoryStream(binFileData.Length);
+    using var mem = new MemoryStream(this.binFileData.Length);
    mem.Write(binFileData, 0, 8 + 16); // copy header

    var newOffsets = new List<int>(newToOld.Count);
@@ -416,7 +447,6 @@ internal class IdtvChannelSerializer : SerializerBase

    binFileData = new byte[mem.Length];
    Array.Copy(mem.GetBuffer(), 0, binFileData, 0, mem.Length);
-    return binFileData;
  }
  #endregion

@@ -430,11 +460,11 @@ internal class IdtvChannelSerializer : SerializerBase
    using var trans = db.BeginTransaction();

    using var upd = db.CreateCommand();
-    upd.CommandText = "update channels set display_number=@progNr, browsable=@browseable, searchable=@searchable, locked=@locked, favorite=@fav, channel_index=@recIdx where _id=@id";
+    upd.CommandText = "update channels set display_number=@progNr, browsable=@browseable, locked=@locked, favorite=@fav, channel_index=@recIdx where _id=@id"; // searchable=@searchable, 
    upd.Parameters.Add("@id", SqliteType.Integer);
    upd.Parameters.Add("@progNr", SqliteType.Text);
    upd.Parameters.Add("@browseable", SqliteType.Integer);
-    upd.Parameters.Add("@searchable", SqliteType.Integer);
+    //upd.Parameters.Add("@searchable", SqliteType.Integer);
    upd.Parameters.Add("@locked", SqliteType.Integer);
    upd.Parameters.Add("@fav", SqliteType.Integer);
    upd.Parameters.Add("@recIdx", SqliteType.Integer);
@@ -464,7 +494,7 @@ internal class IdtvChannelSerializer : SerializerBase
          upd.Parameters["@id"].Value = ch.RecordIndex;
          upd.Parameters["@progNr"].Value = ch.NewProgramNr;
          upd.Parameters["@browseable"].Value = !ch.Skip;
-          upd.Parameters["@searchable"].Value = !ch.Hidden;
+          //upd.Parameters["@searchable"].Value = !ch.Hidden;
          upd.Parameters["@locked"].Value = ch.Lock;
          upd.Parameters["@fav"].Value = (int)ch.Favorites;
          upd.Parameters["@recIdx"].Value = newRecordIndex;
--- a/source/ChanSort.Loader.Panasonic/PanasonicPlugin.cs
+++ b/source/ChanSort.Loader.Panasonic/PanasonicPlugin.cs
@@ -15,13 +15,14 @@ namespace ChanSort.Loader.Panasonic
      // check for files in the 2022 /mnt/vendor/tvdata/database/channel/ directory structure file format with tv.db and idtvChannel.bin
      var name = Path.GetFileName(inputFile).ToLowerInvariant();
      var baseDir = Path.GetDirectoryName(inputFile);
-      if (name == "hotel.bin")
-        baseDir = Path.Combine(baseDir, "mnt", "vendor", "tvdata", "database");
-      if (name == "idtvChannel.bin")
-        baseDir = Path.GetDirectoryName(baseDir);
-      var tvDb = Path.Combine(baseDir, "tv.db");
-      if (File.Exists(tvDb) && File.Exists(Path.Combine(baseDir, "channel", "idtvChannel.bin")))
-        return new IdtvChannelSerializer(tvDb);
+      if (name == "idtvchannel.bin")
+        baseDir = Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(baseDir))))); // go down channel/database/tvdata/vendor/mnt
+      else if (name == "tv.db")
+        baseDir = Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(baseDir)))); // go down database/tvdata/vendor/mnt
+      
+      var hotelBin = Path.Combine(baseDir, "hotel.bin");
+      if (File.Exists(hotelBin) && File.Exists(Path.Combine(baseDir, "mnt/vendor/tvdata/database", "tv.db")) && File.Exists(Path.Combine(baseDir, "mnt/vendor/tvdata/database/channel", "idtvChannel.bin")))
+        return new IdtvChannelSerializer(hotelBin);

      // Android based models use an .xml format. Unfortunately that format is utter garbage and not really useful
      var ext = Path.GetExtension(inputFile).ToLowerInvariant();
--- a/source/ChanSort/MainForm.Designer.cs
+++ b/source/ChanSort/MainForm.Designer.cs
@@ -220,6 +220,7 @@
      this.popupInputSource = new DevExpress.XtraBars.PopupMenu(this.components);
      this.popupFavList = new DevExpress.XtraBars.PopupMenu(this.components);
      this.timerSelectFocusedRow = new System.Windows.Forms.Timer(this.components);
+      this.miDeleteBackup = new DevExpress.XtraBars.BarButtonItem();
      ((System.ComponentModel.ISupportInitialize)(this.splitContainerControl1)).BeginInit();
      ((System.ComponentModel.ISupportInitialize)(this.splitContainerControl1.Panel1)).BeginInit();
      this.splitContainerControl1.Panel1.SuspendLayout();
@@ -235,7 +236,6 @@
      ((System.ComponentModel.ISupportInitialize)(this.repositoryItemTextEdit1)).BeginInit();
      ((System.ComponentModel.ISupportInitialize)(this.pnlEditControls)).BeginInit();
      this.pnlEditControls.SuspendLayout();
-      ((System.ComponentModel.ISupportInitialize)(this.globalImageCollection1)).BeginInit();
      ((System.ComponentModel.ISupportInitialize)(this.grpInputList)).BeginInit();
      this.grpInputList.SuspendLayout();
      ((System.ComponentModel.ISupportInitialize)(this.gridRight)).BeginInit();
@@ -494,10 +494,6 @@
      this.btnSearchLeft.Name = "btnSearchLeft";
      this.btnSearchLeft.Click += new System.EventHandler(this.btnSearch_Click);
      // 
-      // globalImageCollection1
-      // 
-      this.globalImageCollection1.ParentControl = this;
-      // 
      // btnToggleFavH
      // 
      resources.ApplyResources(this.btnToggleFavH, "btnToggleFavH");
@@ -1129,9 +1125,10 @@
            this.miSplitView,
            this.miTheme,
            this.miAutoHideColumns,
-            this.miLoadListAfterStart});
+            this.miLoadListAfterStart,
+            this.miDeleteBackup});
      this.barManager1.MainMenu = this.bar1;
-      this.barManager1.MaxItemId = 117;
+      this.barManager1.MaxItemId = 118;
      this.barManager1.ShowFullMenus = true;
      this.barManager1.ShortcutItemClick += new DevExpress.XtraBars.ShortcutItemClickEventHandler(this.barManager1_ShortcutItemClick);
      // 
@@ -1182,6 +1179,7 @@
            new DevExpress.XtraBars.LinkPersistInfo(this.miOpen),
            new DevExpress.XtraBars.LinkPersistInfo(this.miReload),
            new DevExpress.XtraBars.LinkPersistInfo(this.miRestoreOriginal),
+            new DevExpress.XtraBars.LinkPersistInfo(this.miDeleteBackup),
            new DevExpress.XtraBars.LinkPersistInfo(this.miFileInformation),
            new DevExpress.XtraBars.LinkPersistInfo(this.miSave, true),
            new DevExpress.XtraBars.LinkPersistInfo(this.miSaveAs),
@@ -2224,6 +2222,13 @@
      // 
      this.timerSelectFocusedRow.Tick += new System.EventHandler(this.timerSelectFocusedRow_Tick);
      // 
+      // miDeleteBackup
+      // 
+      resources.ApplyResources(this.miDeleteBackup, "miDeleteBackup");
+      this.miDeleteBackup.Id = 117;
+      this.miDeleteBackup.Name = "miDeleteBackup";
+      this.miDeleteBackup.ItemClick += new DevExpress.XtraBars.ItemClickEventHandler(this.miDeleteBackup_ItemClick);
+      // 
      // MainForm
      // 
      this.AllowDrop = true;
@@ -2256,7 +2261,6 @@
      ((System.ComponentModel.ISupportInitialize)(this.repositoryItemTextEdit1)).EndInit();
      ((System.ComponentModel.ISupportInitialize)(this.pnlEditControls)).EndInit();
      this.pnlEditControls.ResumeLayout(false);
-      ((System.ComponentModel.ISupportInitialize)(this.globalImageCollection1)).EndInit();
      ((System.ComponentModel.ISupportInitialize)(this.grpInputList)).EndInit();
      this.grpInputList.ResumeLayout(false);
      ((System.ComponentModel.ISupportInitialize)(this.gridRight)).EndInit();
@@ -2480,6 +2484,7 @@
    private System.Windows.Forms.Timer timerSelectFocusedRow;
    private DevExpress.XtraBars.BarButtonItem miAutoHideColumns;
    private DevExpress.XtraBars.BarButtonItem miLoadListAfterStart;
-  }
+        private DevExpress.XtraBars.BarButtonItem miDeleteBackup;
+    }
 }

--- a/source/ChanSort/MainForm.cs
+++ b/source/ChanSort/MainForm.cs
@@ -57,6 +57,7 @@ namespace ChanSort.Ui
    private bool splitView = true;
    private int ignoreEvents;
    private bool adjustWindowLocationOnScale = true;
+    private string lastOpenedFile;

    #region ctor()

@@ -244,7 +245,8 @@ namespace ChanSort.Ui
      var filter = GetTvDataFileFilter(out var supportedExtensions, out var numberOfFilters);

      using var dlg = new OpenFileDialog();
-      dlg.InitialDirectory = this.mruFiles.Count > 0 ? Path.GetDirectoryName(this.mruFiles[0]) : Environment.GetFolderPath(Environment.SpecialFolder.MyComputer);
+      var lastFile = this.lastOpenedFile ?? (this.mruFiles.Count > 0 ? this.mruFiles[0] : null);
+      dlg.InitialDirectory = lastFile != null ? Path.GetDirectoryName(this.lastOpenedFile) : Environment.GetFolderPath(Environment.SpecialFolder.MyComputer);
      dlg.AddExtension = true;
      dlg.Filter = filter + string.Format(Resources.MainForm_FileDialog_OpenFileFilter, supportedExtensions);
      dlg.FilterIndex = numberOfFilters + 1;
@@ -321,6 +323,7 @@ namespace ChanSort.Ui
    private void LoadFiles(ISerializerPlugin plugin, string tvDataFile)
    {
      var dataUpdated = false;
+      this.lastOpenedFile = tvDataFile;
      try
      {
        if (DetectCommonFileCorruptions(tvDataFile))
@@ -1761,6 +1764,7 @@ namespace ChanSort.Ui
        this.miReload.Enabled = fileLoaded;
        this.miFileInformation.Enabled = fileLoaded;
        this.miRestoreOriginal.Enabled = fileLoaded && this.GetPathOfMissingBackupFile() == null;
+        this.miDeleteBackup.Enabled = fileLoaded;
        this.miSave.Enabled = fileLoaded;
        this.miSaveAs.Enabled = fileLoaded && this.currentTvSerializer.Features.CanSaveAs;
        this.miOpenReferenceFile.Enabled = fileLoaded;
@@ -1884,6 +1888,32 @@ namespace ChanSort.Ui
    }
    #endregion

+    #region DeleteBackupFile()
+    private void DeleteBackupFile()
+    {
+      if (this.currentTvSerializer == null)
+        return;
+      var files = this.currentTvSerializer.GetDataFilePaths();
+      string lastError = null;
+      foreach (var file in files)
+      {
+        try
+        {
+          var bak = file + ".bak";
+          if (File.Exists(bak))
+            File.Delete(bak);
+        }
+        catch (Exception ex)
+        {
+          lastError = ex.Message;
+        }
+      }
+
+      if (lastError != null)
+        XtraMessageBox.Show(this, lastError);
+    }
+    #endregion
+
    #region ShowFileInformation()

    private void ShowFileInformation()
@@ -3159,6 +3189,11 @@ namespace ChanSort.Ui
      TryExecute(this.RestoreBackupFile);
    }

+    private void miDeleteBackup_ItemClick(object sender, ItemClickEventArgs e)
+    {
+      TryExecute(this.DeleteBackupFile);
+    }
+
    private void miFileInformation_ItemClick(object sender, ItemClickEventArgs e)
    {
      TryExecute(this.ShowFileInformation);
--- a/source/ChanSort/MainForm.resx
+++ b/source/ChanSort/MainForm.resx
@@ -276,7 +276,7 @@
    <value>gridLeft</value>
  </data>
  <data name="&gt;&gt;gridLeft.Type" xml:space="preserve">
-    <value>ChanSort.XGridControl, ChanSort, Version=1.0.8308.20323, Culture=neutral, PublicKeyToken=null</value>
+    <value>ChanSort.XGridControl, ChanSort, Version=1.0.8313.22695, Culture=neutral, PublicKeyToken=null</value>
  </data>
  <data name="&gt;&gt;gridLeft.Parent" xml:space="preserve">
    <value>grpOutputList</value>
@@ -410,6 +410,9 @@
  <data name="miRestoreOriginal.ImageOptions.ImageIndex" type="System.Int32, mscorlib">
    <value>31</value>
  </data>
+  <data name="miDeleteBackup.Caption" xml:space="preserve">
+    <value>Delete backup files</value>
+  </data>
  <data name="miFileInformation.Caption" xml:space="preserve">
    <value>File &amp;information...</value>
  </data>
@@ -1237,7 +1240,7 @@
    <value>gviewLeft</value>
  </data>
  <data name="&gt;&gt;gviewLeft.Type" xml:space="preserve">
-    <value>ChanSort.XGridView, ChanSort, Version=1.0.8308.20323, Culture=neutral, PublicKeyToken=null</value>
+    <value>ChanSort.XGridView, ChanSort, Version=1.0.8313.22695, Culture=neutral, PublicKeyToken=null</value>
  </data>
  <data name="&gt;&gt;colIndex1.Name" xml:space="preserve">
    <value>colIndex1</value>
@@ -1321,13 +1324,13 @@
    <value>globalImageCollection1</value>
  </data>
  <data name="&gt;&gt;globalImageCollection1.Type" xml:space="preserve">
-    <value>ChanSort.Ui.GlobalImageCollection, ChanSort, Version=1.0.8308.20323, Culture=neutral, PublicKeyToken=null</value>
+    <value>ChanSort.Ui.GlobalImageCollection, ChanSort, Version=1.0.8313.22695, Culture=neutral, PublicKeyToken=null</value>
  </data>
  <data name="&gt;&gt;gviewRight.Name" xml:space="preserve">
    <value>gviewRight</value>
  </data>
  <data name="&gt;&gt;gviewRight.Type" xml:space="preserve">
-    <value>ChanSort.XGridView, ChanSort, Version=1.0.8308.20323, Culture=neutral, PublicKeyToken=null</value>
+    <value>ChanSort.XGridView, ChanSort, Version=1.0.8313.22695, Culture=neutral, PublicKeyToken=null</value>
  </data>
  <data name="&gt;&gt;colIndex.Name" xml:space="preserve">
    <value>colIndex</value>
@@ -2091,12 +2094,24 @@
  <data name="&gt;&gt;timerSelectFocusedRow.Type" xml:space="preserve">
    <value>System.Windows.Forms.Timer, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
  </data>
+  <data name="&gt;&gt;miDeleteBackup.Name" xml:space="preserve">
+    <value>miDeleteBackup</value>
+  </data>
+  <data name="&gt;&gt;miDeleteBackup.Type" xml:space="preserve">
+    <value>DevExpress.XtraBars.BarButtonItem, DevExpress.XtraBars.v22.1, Version=22.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a</value>
+  </data>
  <data name="&gt;&gt;$this.Name" xml:space="preserve">
    <value>MainForm</value>
  </data>
  <data name="&gt;&gt;$this.Type" xml:space="preserve">
    <value>DevExpress.XtraEditors.XtraForm, DevExpress.Utils.v22.1, Version=22.1.5.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a</value>
  </data>
+  <data name="SharedImageCollection.Timestamp" type="System.DateTime, mscorlib">
+    <value>10/05/2022 12:50:36</value>
+  </data>
+  <data name="SharedImageCollection.ImageSize" type="System.Drawing.Size, System.Drawing">
+    <value>16, 16</value>
+  </data>
  <data name="btnSearchLeft.Location" type="System.Drawing.Point, System.Drawing">
    <value>444, 5</value>
  </data>
@@ -2982,7 +2997,7 @@
    <value>gridRight</value>
  </data>
  <data name="&gt;&gt;gridRight.Type" xml:space="preserve">
-    <value>ChanSort.XGridControl, ChanSort, Version=1.0.8308.20323, Culture=neutral, PublicKeyToken=null</value>
+    <value>ChanSort.XGridControl, ChanSort, Version=1.0.8313.22695, Culture=neutral, PublicKeyToken=null</value>
  </data>
  <data name="&gt;&gt;gridRight.Parent" xml:space="preserve">
    <value>grpInputList</value>
--- a/source/Information/FileStructures_for_HHD_Hex_Editor_Neo/panasonic_idtvChannelBin.h
+++ b/source/Information/FileStructures_for_HHD_Hex_Editor_Neo/panasonic_idtvChannelBin.h
@@ -0,0 +1,51 @@
+#include "chansort.h"
+
+/***********************************************************
+ * Panasonic LS/LX 2022 idtvChannel.bin
+ ***********************************************************/
+
+enum Flags : word
+{
+  Encrypted = 0x0002,
+  IsFavorite = 0x0080,
+  Deleted = 0x0100,
+  Hidden = 0x0400,
+  CustomProgNr = 0x1000
+};
+
+struct Pa_idtvChannel_bin_FileEntry
+{
+  word U0; // always 1
+  word RecordLength; // 60 + length of channel name
+  word U4; // always 6
+  byte U6[3]; // all 00
+  word U9; // 0 = Sat, 18 = Cable ?
+  byte U11[5]; // all 00
+  dword Freq; // Hz for DVB-C/T, kHz for DVB-S
+  dword SymRate; // in Sym/s, like 22000000
+  word U24; // always 100
+  word U26; // always 0
+  word U28; // always 0
+  word ProgNr;
+  word LcnMaybe;
+  byte U32[2]; // e.g. 0a 01 00 00
+  Flags Flags;
+  byte U38[4]; // 12 07 01 02
+  word Tsid;
+  word Onid;
+  word Sid;
+  byte U48[4];
+  dword ProviderFlag2;
+  byte U56[8];
+  byte ChannelName[RecordLength - 60];
+};
+
+public struct Pa_idtvChannel_bin
+{
+  word u0;
+  word u2;
+  word numRecords;
+  word u6;
+  byte md5[16];
+  Pa_idtvChannel_bin_FileEntry fileEntries[numRecords];
+};