public override void ReadFrom(OpenTypeReader reader, uint length)
{
Format = (FormatEnum)reader.ReadUInt16();
Count = reader.ReadUInt16();
StringOffset = reader.ReadUInt16();
uint seekOffset = (uint)StringOffset - 6;
NameRecords = ReadNameRecords(reader);
seekOffset -= Count * NameRecord.Size;
if (Format == FormatEnum.LangTagged)
{
LangTagCount = reader.ReadUInt16();
seekOffset -= 2;
LangTagRecords = ReadLangTagRecords(reader);
seekOffset -= LangTagCount * LangTagRecord.Size;
}
reader.BaseStream.Seek(seekOffset, SeekOrigin.Current);
var startBase = reader.BaseStream.Position;
foreach (var name in NameRecords)
{
reader.BaseStream.Position = startBase + name.Offset;
var nameBytes = reader.ReadBytes(name.Length);
// TODO: maybe know how to identify more platforms and encodings?
if (name.PlatformID == NameRecord.Platform.Windows || name.PlatformID == NameRecord.Platform.Unicode)
{
name.Value = Encoding.BigEndianUnicode.GetString(nameBytes);
}
else
{
// hope and pray that the encoding is always UTF-8
name.Value = Encoding.UTF8.GetString(nameBytes);
}
}
foreach (var langTag in LangTagRecords)
{
reader.BaseStream.Position = startBase + langTag.Offset;
var nameBytes = reader.ReadBytes(langTag.Length);
// hope and pray that the encoding is always UTF-8
langTag.Value = Encoding.UTF8.GetString(nameBytes);
}
}
// uses Count to read them
private IReadOnlyList <NameRecord> ReadNameRecords(OpenTypeReader reader)
{
var list = new List <NameRecord>();
for (int i = 0; i < Count; i++)
{
list.Add(new NameRecord
{
PlatformID = (NameRecord.Platform)reader.ReadUInt16(),
EncodingID = reader.ReadUInt16(),
LanguageID = reader.ReadUInt16(),
NameID = (NameRecord.NameType)reader.ReadUInt16(),
Length = reader.ReadUInt16(),
Offset = reader.ReadOffset16()
});
}
return(list);
}
// uses LangTagCount to read them
private IReadOnlyList <LangTagRecord> ReadLangTagRecords(OpenTypeReader reader)
{
var list = new List <LangTagRecord>();
for (int i = 0; i < LangTagCount; i++)
{
list.Add(new LangTagRecord
{
Length = reader.ReadUInt16(),
Offset = reader.ReadOffset16()
});
}
return(list);
}
