internal static bool TryReadHeaderAfterVersion(BigEndianReader reader, TrueTypeVersionReader version, bool validate, out TrueTypeHeader header)
{
header = null;
ushort numtables = reader.ReadUInt16();
ushort search = reader.ReadUInt16();
ushort entry = reader.ReadUInt16();
ushort range = reader.ReadUInt16();
//Validate values returned.
if (validate)
{
//searchRange is the (Maximum power of 2 <= numTables) * 16
ushort max2 = 2;
while (max2 * 2 <= numtables)
{
max2 *= 2;
}
if (search != max2 * 16)
{
return(false);
}
//entrySelector is Log2(max2)
if (Math.Log(max2, 2) != entry)
{
return(false);
}
//rangeShift = numTables * 16-searchRange
if (range != ((numtables * 16) - search))
{
return(false);
}
}
header = new TrueTypeHeader(version, numtables);
header.SearchRange = search;
header.EntrySelector = entry;
header.RangeShift = range;
return(true);
}
public TrueTypeHeader(TrueTypeVersionReader version, int numTables)
: base(version, numTables)
{
}
