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https://github.com/PredatH0r/ChanSort.git
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- DX upgrade
- experimental support for Philips Repair\mgr_chan_s_fta.db file format (DVB-S only) - fixed missing strings for LG empty-channel-list message box
This commit is contained in:
Horst Beham
186
source/ChanSort.Loader.Philips/DbSerializer.cs
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186
source/ChanSort.Loader.Philips/DbSerializer.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using ChanSort.Api;
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namespace ChanSort.Loader.Philips
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{
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/*
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* This serializer is used for the channel list format with a Repair\ folder containing files like channel_db_ver.db, mgr_chan_s_fta.db, ...
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* The .db files are proprietary binary files, not SQLite databases.
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* So far only the mgr_chan_s_fta.db file holing DVB-S channels is reverse engineered, the offsets are defined in PChanSort.Loader.Philips.ini
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*/
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class DbSerializer : SerializerBase
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{
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private readonly IniFile ini;
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private readonly List<string> dataFilePaths = new List<string>();
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private readonly ChannelList dvbsChannels = new ChannelList(SignalSource.DvbS, "DVB-S");
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public DbSerializer(string inputFile) : base(inputFile)
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{
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this.Features.MaxFavoriteLists = 1;
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this.Features.FavoritesMode = FavoritesMode.OrderedPerSource;
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this.Features.DeleteMode = DeleteMode.NotSupported;
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string iniFile = Assembly.GetExecutingAssembly().Location.Replace(".dll", ".ini");
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this.ini = new IniFile(iniFile);
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this.DataRoot.AddChannelList(dvbsChannels);
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dvbsChannels.VisibleColumnFieldNames = new List<string>
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{
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"Position", //nameof(Channel.NewProgramNr),
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"OldPosition", // nameof(Channel.OldProgramNr),
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nameof(Channel.Name),
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nameof(Channel.Favorites),
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nameof(Channel.FreqInMhz),
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nameof(Channel.SymbolRate),
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nameof(Channel.TransportStreamId),
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nameof(Channel.OriginalNetworkId),
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nameof(Channel.ServiceId)
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};
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}
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#region Load()
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public override void Load()
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{
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bool validList = false;
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foreach (var file in Directory.GetFiles(Path.GetDirectoryName(this.FileName)))
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{
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var lc = Path.GetFileName(file).ToLowerInvariant();
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switch (lc)
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{
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case "mgr_chan_s_fta.db":
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LoadDvbs(file);
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validList = true;
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break;
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}
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}
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if (!validList)
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throw new FileLoadException(this.FileName + " is not a supported Philips Repair/mgr_chan_s_fta.db channel list");
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}
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private void LoadDvbs(string file)
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{
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var data = File.ReadAllBytes(file);
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var sec = ini.GetSection("mgr_chan_s_fta.db");
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var lenHeader = sec.GetInt("lenHeader");
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var lenFooter = sec.GetInt("lenFooter");
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var lenEntry = sec.GetInt("lenEntry");
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var offFooterChecksum = sec.GetInt("offFooterChecksum");
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var records = (data.Length - lenHeader - lenFooter) / lenEntry;
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if (records <= 0)
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throw new FileLoadException("Currently only DVB-S lists are supported and mgr_chan_s_fta.db contains no channels.");
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var mapping = new DataMapping(this.ini.GetSection("mgr_chan_s_fta.db_entry"));
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sec = ini.GetSection("mgr_chan_s_fta.db_entry");
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var lenName = sec.GetInt("lenName");
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for (int i = 0; i < records; i++)
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{
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mapping.SetDataPtr(data, lenHeader + i * lenEntry);
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var oldProgNr = mapping.GetWord("offProgNr");
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// name can be either an 8-bit ASCII with unspecified encoding or big-endian 16-bit unicode
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var off = mapping.BaseOffset + mapping.GetOffsets("offName")[0];
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var name = data[off + 0] == 0 ? (data[off + 1] == 0 ? "" : Encoding.BigEndianUnicode.GetString(data, off, lenName)) : DefaultEncoding.GetString(data, off, lenName);
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name = name.TrimEnd('\0');
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var ch = new Channel(SignalSource.DvbS, i, oldProgNr, name);
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ch.RecordOrder = i;
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var favPos = mapping.GetWord("offFav");
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if (favPos > 0)
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ch.SetOldPosition(1, favPos);
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ch.SymbolRate = mapping.GetWord("offSymbolRate");
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ch.FreqInMhz = mapping.GetWord("offFreq");
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ch.TransportStreamId = mapping.GetWord("offTsid");
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ch.OriginalNetworkId = mapping.GetWord("offOnid");
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ch.ServiceId = mapping.GetWord("offSid");
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this.DataRoot.AddChannel(dvbsChannels, ch);
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}
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var offChecksum = data.Length - lenFooter + offFooterChecksum;
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var expectedChecksum = BitConverter.ToUInt16(data, offChecksum);
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var actualChecksum = CalcChecksum(data, 0, offChecksum);
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if (actualChecksum != expectedChecksum)
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throw new FileLoadException($"File {file} contains invalid checksum. Expected {expectedChecksum:x4} but calculated {actualChecksum:x4}");
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this.dataFilePaths.Add(file);
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}
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#endregion
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#region CalcChecksum()
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/// <summary>
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/// The checksum is the 16-bit sum over the byte-values in the file data from offset 0 to right before the checksum field
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/// </summary>
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private ushort CalcChecksum(byte[] data, int start, int len)
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{
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ushort checksum = 0;
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while (len > 0)
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{
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checksum += data[start++];
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--len;
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}
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return checksum;
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}
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#endregion
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public override IEnumerable<string> GetDataFilePaths() => this.dataFilePaths.ToList();
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#region Save()
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public override void Save(string tvOutputFile)
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{
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foreach (var file in this.dataFilePaths)
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{
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var lc = Path.GetFileName(file).ToLowerInvariant();
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switch (lc)
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{
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case "mgr_chan_s_fta.db":
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SaveDvbs(file);
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break;
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}
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}
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}
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private void SaveDvbs(string file)
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{
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var data = File.ReadAllBytes(file);
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var sec = ini.GetSection("mgr_chan_s_fta.db");
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var lenHeader = sec.GetInt("lenHeader");
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var lenFooter = sec.GetInt("lenFooter");
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var lenEntry = sec.GetInt("lenEntry");
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var offFooterChecksum = sec.GetInt("offFooterChecksum");
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var mapping = new DataMapping(ini.GetSection("mgr_chan_s_fta.db_entry"));
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// update channel data
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foreach (var ch in dvbsChannels.Channels)
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{
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mapping.SetDataPtr(data, lenHeader + ch.RecordOrder * lenEntry);
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mapping.SetWord("offProgNr", ch.NewProgramNr);
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mapping.SetWord("offPrevProgNr", ch.NewProgramNr - 1);
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mapping.SetWord("offFav", Math.Max(0, ch.GetPosition(1)));
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}
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// update checksum
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var offChecksum = data.Length - lenFooter + offFooterChecksum;
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var checksum = CalcChecksum(data, 0, offChecksum);
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data[offChecksum] = (byte)checksum;
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data[offChecksum + 1] = (byte)(checksum >> 8);
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File.WriteAllBytes(file, data);
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}
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#endregion
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}
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}
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