private static TT_OS2_RECORD GetOs2Record(BinaryReader r)
{
byte[] btOs2Record = r.ReadBytes(Marshal.SizeOf(ttOs2Record));
btOs2Record = BigEndian(btOs2Record);
IntPtr ptrOs2Record = Marshal.AllocHGlobal(btOs2Record.Length);
Marshal.Copy(btOs2Record, 0x0, ptrOs2Record, btOs2Record.Length);
TT_OS2_RECORD ttOs2Result = (TT_OS2_RECORD)Marshal.PtrToStructure(ptrOs2Record, typeof(TT_OS2_RECORD));
Marshal.FreeHGlobal(ptrOs2Record);
return(ttOs2Result);
}
public static FsType GetFsType(string fontFullName)
{
if (!File.Exists(fontFullName))
{
throw new FileNotFoundException(fontFullName);
}
FileStream fs = new FileStream(fontFullName, FileMode.Open, FileAccess.Read);
BinaryReader r = new BinaryReader(fs);
TT_OFFSET_TABLE ttResult = GetOffsetTable(r);
//ttf Must be maj =1 minor = 0
int numTables = 0;
if (ttResult.uMajorVersion == 1 && ttResult.uMinorVersion == 0)
{
numTables = ttResult.uNumOfTables;
}
else
{
fs.Position = 0L;
SFNT sFnt = GetSfnt(r);
string szSfnt = string.Format("{0}{1}{2}{3}", (char)sFnt.szSfnt1, (char)sFnt.szSfnt2, (char)sFnt.szSfnt3, (char)sFnt.szSfnt4);
switch (szSfnt)
{
case "OTTO":
OT_OFFSET_TABLE otResult = GetOpenTypeOffsetTable(r);
numTables = otResult.uNumOfTables;
break;
case "ttcf":
TTC_HEADER_1 ttcHeader = GetTtcHeader(r);
if ((ttcHeader.uMajorVersion != 1 && ttcHeader.uMajorVersion != 2) || ttcHeader.uMinorVersion != 0)
{
throw new VersionNotFoundException(fontFullName + " Expected header version 1.0 or 2.0");
}
GetTtcOffsets(r, ttcHeader.uNumFonts);
fs.Position = long.Parse(ttcOffsets[0].ToString());
ttResult = GetOffsetTable(r);
if (ttResult.uMajorVersion == 1 && ttResult.uMinorVersion == 0)
{
numTables = ttResult.uNumOfTables;
}
else
{
throw new VersionNotFoundException(fontFullName + " expected TrueType version 1.0");
}
break;
default:
throw new MissingFieldException(fontFullName + " Font type should be ttcf or OTTO");
}
}
bool bFound = false;
TT_TABLE_DIRECTORY tbName = new TT_TABLE_DIRECTORY();
for (int i = 0; i < numTables; i++)
{
tbName = GetNameTable(r);
string szName = tbName.szTag1.ToString() + tbName.szTag2.ToString() + tbName.szTag3.ToString() + tbName.szTag4.ToString();
if (szName != null)
{
if (szName == "OS/2") // http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=IWS-AppendixC
{
bFound = true;
tbName.uLength = BigEndianValue(tbName.uLength);
tbName.uOffset = BigEndianValue(tbName.uOffset);
break;
}
}
}
if (bFound)
{
fs.Position = tbName.uOffset;
TT_OS2_RECORD ttOs2Result = GetOs2Record(r);
return(ttOs2Result.fsType);
}
throw new MissingFieldException(fontFullName + " should contain OS/2 table");
}