public static LocaTable Deserialize(BinaryReader reader, long startOffset, ushort numberOfGlyphs,
LocaTableVersion version)
{
var table = new LocaTable();
reader.BaseStream.Position = startOffset;
table.GlyphOffsets.AddRange(Enumerable.Range(0, numberOfGlyphs).Select <int, uint?>(i =>
{
var offset = ReadNextOffset(reader, version);
// Peek next offset
var restorePosition = reader.BaseStream.Position;
var nextOffset = ReadNextOffset(reader, version);
reader.BaseStream.Position = restorePosition;
// Empty outline check
if (offset == nextOffset)
{
return(null);
}
return(offset);
}));
return(table);
}
private static uint ReadNextOffset(BinaryReader reader, LocaTableVersion version)
{
switch (version)
{
case LocaTableVersion.Long:
return(DataTypeConverter.ReadULong(reader));
case LocaTableVersion.Short:
return((uint)(DataTypeConverter.ReadUShort(reader) * 2));
default:
throw new NotImplementedException();
}
}
private static void WriteNextOffset(BinaryWriter writer, uint offset, LocaTableVersion version)
{
switch (version)
{
case LocaTableVersion.Long:
DataTypeConverter.WriteULong(writer, offset);
break;
case LocaTableVersion.Short:
DataTypeConverter.WriteUShort(writer, (ushort)(offset / 2));
break;
default:
throw new NotImplementedException();
}
}
