private static CmapFormat ReadSubtable(FontStreamReader reader, ushort platformId, ushort platformSpecificId, uint offset)
{
reader.Push();
reader.Seek(offset, SeekOrigin.Begin);
var format = reader.ReadUInt16();
CmapFormat result;
switch (format)
{
case 0: result = CmapFormat0.Read(reader, platformId, platformSpecificId); break;
case 2: result = CmapFormat2.Read(reader, platformId, platformSpecificId); break;
case 4: result = CmapFormat4.Read(reader, platformId, platformSpecificId); break;
case 6: result = CmapFormat6.Read(reader, platformId, platformSpecificId); break;
case 8: result = CmapFormat8.Read(reader, platformId, platformSpecificId); break;
case 10: result = CmapFormat10.Read(reader, platformId, platformSpecificId); break;
case 12: result = CmapFormat12.Read(reader, platformId, platformSpecificId); break;
case 13: result = CmapFormat13.Read(reader, platformId, platformSpecificId); break;
case 14: result = CmapFormat14.Read(reader, platformId, platformSpecificId); break;
default: throw new FormatException($"Unexpected cmap subtable format: {format}");
}
reader.Pop();
return(result);
}