/// <summary>
/// Gets a version reader for a typeface from the reader at the current position
/// </summary>
/// <param name="reader">The bigendian reader to read the version from</param>
/// <param name="vers">Set to the version reader if known</param>
/// <returns>True if the version is known, otherwise false</returns>
/// <remarks>This will check the current reader for a known version and move the position on 4 bytes</remarks>
public static bool TryGetVersion(BigEndianReader reader, out TypefaceVersionReader vers, bool thrownOnUnsupported = false)
{
vers = null;
byte[] data = reader.Read(4);
char[] chars = ConvertToChars(data, 4);
if (chars[0] == 'O' && chars[1] == 'T' && chars[2] == 'T' && chars[3] == 'O') //OTTO
{
vers = new OTTO.CCFOpenTypeVersionReader(new string(chars), data);
}
else if (chars[0] == 't' && chars[1] == 'r' && chars[2] == 'u' && chars[3] == 'e') //true
{
vers = new TTF.TrueTypeVersionReader(new string(chars), data);
}
else if (chars[0] == 't' && chars[1] == 'y' && chars[2] == 'p' && chars[3] == '1') //typ1
{
vers = new TTF.TrueTypeVersionReader(new string(chars), data);
}
else if (chars[0] == 't' && chars[1] == 't' && chars[2] == 'c' && chars[3] == 'f') //ttcf
{
vers = new TTC.TTCollectionVersionReader(new string(chars), data);
}
else if (chars[0] == 'w' && chars[1] == 'O' && chars[2] == 'F' && chars[3] == 'F') //wOFF
{
vers = new Woff.WoffVersionReader(new string(chars), data);
}
else if (chars[0] == 'w' && chars[1] == 'O' && chars[2] == 'F' && chars[3] == '2') //wOF2
{
vers = null; // new Woff2.Woff2VersionReader(new string(chars), data);
}
//throw new NotSupportedException("The Woff2 format is not currently supported.");
else //1.0
{
BigEnd16 wrd1 = new BigEnd16(data, 0);
BigEnd16 wrd2 = new BigEnd16(data, 2);
if (((int)wrd1.UnsignedValue) == 1 && ((int)wrd2.UnsignedValue) == 0)
{
vers = new OTTO.OpenType1VersionReader(wrd1.UnsignedValue, wrd2.UnsignedValue, data);
}
}
return(vers != null);
}
internal static bool TryReadHeader(BigEndianReader reader, out TrueTypeHeader header)
{
header = null;
TypefaceVersionReader vers;
if (TypefaceVersionReader.TryGetVersion(reader, out vers) == false)
{
return(false);
}
else if (vers is TrueTypeVersionReader ttv)
{
return(TryReadHeaderAfterVersion(reader, ttv, false, out header));
}
else
{
return(false);
}
}
public TypefaceHeader(TypefaceVersionReader version, int numTables)
{
this.Version = version;
this.NumberOfTables = numTables;
}
