public static byte[] ExtractTTFfromTTC(System.IO.Stream ttc, int ttfHeadOffset)
{
using (System.IO.MemoryStream ttf = new System.IO.MemoryStream())
{
BigEndianReader reader = new BigEndianReader(ttc);
reader.Position = ttfHeadOffset;
TrueTypeHeader header;
if (TrueTypeHeader.TryReadHeader(reader, out header) == false)
{
throw new NotSupportedException("The current stream is not a supported OpenType or TrueType font file");
}
List <TrueTypeTableEntry> dirs;
try
{
dirs = new List <TrueTypeTableEntry>();
for (int i = 0; i < header.NumberOfTables; i++)
{
TrueTypeTableEntry dir = new TrueTypeTableEntry();
dir.Read(reader);
dirs.Add(dir);
}
}
catch (TypefaceReadException) { throw; }
catch (Exception ex) { throw new TypefaceReadException("Could not read the TTF File", ex); }
BigEndianWriter writer = new BigEndianWriter(ttf);
writer.Write(header.Version.HeaderData);
writer.WriteUInt16((ushort)header.NumberOfTables);
writer.WriteUInt16((ushort)header.SearchRange);
writer.WriteUInt16((ushort)header.EntrySelector);
writer.WriteUInt16((ushort)header.RangeShift);
long[] dirOffsets = new long[dirs.Count]; //Set to the byte position of the Offset32 in the header to point to the table
long[] tableOffsets = new long[dirs.Count]; //Set to the byte position of the table in the file
for (var i = 0; i < dirs.Count; i++)
{
var dir = dirs[i];
writer.WriteASCIIChars(dir.Tag);
writer.WriteUInt32(dir.CheckSum);
//Write zero as the offset initially and then we will come back and update
dirOffsets[i] = writer.Position;
writer.WriteUInt32(0);
writer.WriteUInt32(dir.Length);
}
for (var i = 0; i < dirs.Count; i++)
{
var dir = dirs[i];
while (writer.Position % 4 != 0)
{
writer.WriteByte(Zero);
}
//Remember the start position of the table
tableOffsets[i] = writer.Position;
reader.Position = dir.Offset;
//we can improve this
var data = reader.Read((int)dir.Length);
writer.Write(data);
}
for (int i = 0; i < dirs.Count; i++)
{
writer.Position = dirOffsets[i];
writer.WriteUInt32((uint)tableOffsets[i]);
}
writer.Position = 0;
var fileData = ttf.ToArray();
return(fileData);
}
}
/// <summary>
/// Performs the actual reading and loading of the file with the BigEndian reader
/// </summary>
/// <param name="reader"></param>
/// <param name="fullpath"></param>
/// <returns></returns>
private static TTFRef DoLoadRef(BigEndianReader reader, string fullpath)
{
TrueTypeHeader head;
if (TrueTypeHeader.TryReadHeader(reader, out head) == false)
{
return(null);
}
TrueTypeTableEntryList list = new TrueTypeTableEntryList();
bool hasOs2 = false;
bool hasFHead = false;
bool hasName = false;
for (int i = 0; i < head.NumberOfTables; i++)
{
TrueTypeTableEntry dir = new TrueTypeTableEntry();
dir.Read(reader);
list.Add(dir);
if (dir.Tag == TrueTypeTableNames.WindowsMetrics)
{
hasOs2 = true;
}
else if (dir.Tag == TrueTypeTableNames.FontHeader)
{
hasFHead = true;
}
else if (dir.Tag == TrueTypeTableNames.NamingTable)
{
hasName = true;
}
}
TrueTypeTableFactory fact = (head.Version as TrueTypeVersionReader).GetTableFactory();
SubTables.NamingTable ntable = null;
if (hasName)
{
ntable = fact.ReadTable(TrueTypeTableNames.NamingTable, list, reader) as SubTables.NamingTable;
}
else
{
throw new ArgumentNullException("The required '" + TrueTypeTableNames.NamingTable + "' is not present in this font file. The OpenType file is corrupt");
}
//if (fhead == null)
// throw new ArgumentNullException("The required '" + FontHeaderTable + "' is not present in this font file. The OpenType file is corrupt");
TTFRef ttfref = new TTFRef(fullpath);
NameEntry entry;
int FamilyNameID = 1;
if (ntable.Names.TryGetEntry(FamilyNameID, out entry))
{
ttfref.FamilyName = entry.ToString();
}
if (hasOs2)
{
SubTables.OS2Table os2table = fact.ReadTable(TrueTypeTableNames.WindowsMetrics, list, reader) as SubTables.OS2Table;
ttfref.FontRestrictions = os2table.FSType;
ttfref.FontWidth = os2table.WidthClass;
ttfref.FontWeight = os2table.WeightClass;
ttfref.FontSelection = os2table.Selection;
}
else if (hasFHead)
{
SubTables.FontHeader fhead = fact.ReadTable(TrueTypeTableNames.FontHeader, list, reader) as SubTables.FontHeader;
var mac = fhead.MacStyle;
ttfref.FontRestrictions = FontRestrictions.InstallableEmbedding;
ttfref.FontWeight = WeightClass.Normal;
if ((mac & FontStyleFlags.Condensed) > 0)
{
ttfref.FontWidth = WidthClass.Condensed;
}
else if ((mac & FontStyleFlags.Extended) > 0)
{
ttfref.FontWidth = WidthClass.Expanded;
}
ttfref.FontSelection = 0;
if ((mac & FontStyleFlags.Italic) > 0)
{
ttfref.FontSelection |= FontSelection.Italic;
}
if ((mac & FontStyleFlags.Bold) > 0)
{
ttfref.FontSelection |= FontSelection.Bold;
ttfref.FontWeight = WeightClass.Bold;
}
if ((mac & FontStyleFlags.Outline) > 0)
{
ttfref.FontSelection |= FontSelection.Outlined;
}
if ((mac & FontStyleFlags.Underline) > 0)
{
ttfref.FontSelection |= FontSelection.Underscore;
}
}
else
{
throw new ArgumentNullException("The required '" + TrueTypeTableNames.WindowsMetrics + "' or '" + TrueTypeTableNames.FontHeader + " are not present in this font file. The OpenType file is corrupt");
}
return(ttfref);
}
