private void LoadDvbS(ChannelList list, string path, string mappingName)
{
if (!File.Exists(path))
{
return;
}
var data = File.ReadAllBytes(path);
if (data.Length < 12)
{
return;
}
var version = chanLstBin.VersionMajor;
if (version <= 11)
{
var checksum = BitConverter.ToUInt32(data, data.Length - 4);
var crcObj = new Crc32(false, Crc32.NormalPoly);
var crc = ~crcObj.CalcCrc32(data, 0, data.Length - 4);
if (checksum != crc)
{
throw new FileLoadException("Invalid CRC32 in " + path);
}
}
int recordSize = BitConverter.ToInt32(data, 4);
int recordCount = BitConverter.ToInt32(data, 8);
if (recordSize == 0 && version != 1)
{
recordSize = recordCount == 0 ? 0 : (data.Length - 12) / recordCount;
}
if (chanLstBin.VersionMajor <= 11)
{
// 12 bytes header, then a "next/prev" table, then the service records, then a CRC32
// the "next/prev" table is a ring-list, every entry consists of 2 ushorts with the next and previous channel, wrapping around on the ends
if (data.Length != 12 + recordCount * 4 + recordCount * recordSize + 4)
{
throw new FileLoadException("Unsupported file content: " + path);
}
}
this.dataFilePaths.Add(path);
var dvbStringDecoder = new DvbStringDecoder(this.DefaultEncoding);
var mapping = new DataMapping(this.ini.GetSection(mappingName));
mapping.SetDataPtr(data, 12 + (chanLstBin.VersionMajor <= 11 ? recordCount * 4 : 0));
for (int i = 0; i < recordCount; i++, mapping.BaseOffset += recordSize)
{
var ch = LoadDvbsChannel(list, mapping, i, dvbStringDecoder);
this.DataRoot.AddChannel(list, ch);
}
}
/// <summary>
/// Dump this file data to another file.
/// </summary>
/// <param name="toFile">The destination file stream.</param>
/// <returns>Length copied.</returns>
public override long DumpData(FileStream toFile)
{
if (this.file == null || !this.file.CanRead)
{
throw new IOException("Source stream is not accessable!");
}
if (this.fileSize < this.extractSize)
{
// Compressed
return(this.DecompressToFile(toFile));
}
else
{
// Not compressed
byte[] content = StreamUtility.ReadBytesFromStream(this.file, this.fileOffset, (int)this.extractSize);
Debug.WriteLine(String.Format("CRC for file {0} is {1:X4}", this.fileName, Crc32.CalcCrc32(content)));
return(StreamUtility.CopyBlock(this.file, toFile, this.fileOffset, (int)this.extractSize));
}
}