private static SubfieldId ReadExtraFields(Core.Utility.BinaryReader reader, MetadataFlags flags, ref int bytesRead)
{
var subfieldIdentifier = SubfieldId.None;
if (flags.HasFlag(MetadataFlags.ExtraFieldsPresent))
{
subfieldIdentifier = (SubfieldId)reader.ReadUInt16();
bytesRead += sizeof(SubfieldId);
var subfieldDataLength = reader.ReadUInt16(); // little-endian
bytesRead += sizeof(ushort);
reader.BaseStream.Seek(subfieldDataLength, SeekOrigin.Current); // just skip
}
return(subfieldIdentifier);
}
private static ushort ReadCrc16(Core.Utility.BinaryReader reader, MetadataFlags flags, ref int bytesRead)
{
ushort crc16 = 0;
if (flags.HasFlag(MetadataFlags.Crc16Present))
{
crc16 = reader.ReadUInt16();
bytesRead += sizeof(ushort);
}
return(crc16);
}
/// <inheritdoc />
/// <remarks>The precondition here is that the reader is positioned immediately after the LUIGI block type value.</remarks>
public override int Deserialize(Core.Utility.BinaryReader reader)
{
Length = reader.ReadUInt16();
var bytesRead = PayloadLengthSize;
HeaderCrc = reader.ReadByte();
bytesRead += HeaderChecksumSize;
ValidateHeaderCrc();
if (Length > 0)
{
PayloadCrc = reader.ReadUInt32();
bytesRead += PayloadChecksumSize;
bytesRead += DeserializePayload(reader);
}
return(bytesRead);
}