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);
}
}
private void DoWriteWoffToTTF(MemoryStream ms)
{
var dirs = this.Directories.ToArray();
BigEndianWriter writer = new BigEndianWriter(ms);
writer.Write(TypefaceVersionReader.TrueTypeHeaderBytes);
writer.WriteUInt16((ushort)dirs.Length);
var checkOffset = ms.Position;
ushort max2 = 2;
while (max2 * 2 <= this.Directories.Count)
{
max2 *= 2;
}
ushort search = (ushort)(max2 * 16);
ushort entry = (ushort)Math.Log(max2, 2);
ushort range = (ushort)((dirs.Length * 16) - search);
writer.WriteUInt16(search);
writer.WriteUInt16(entry);
writer.WriteUInt16(range);
var offset = writer.Position;
var dirOffsets = new long[dirs.Length];
var tableOffsets = new long[dirs.Length];
for (int i = 0; i < dirs.Length; i++)
{
var dir = dirs[i] as WoffTableEntry;
if (dir.DecompressedData == null)
{
throw new InvalidOperationException("The directrory " + dir.Tag + " does not have any decompressed data");
}
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.Length; i++)
{
var dir = dirs[i] as WoffTableEntry;
//pad to 4 bytes
while (writer.Position % 4 != 0)
{
writer.WriteByte(Zero);
}
//remember the position and write the decompressed data
tableOffsets[i] = writer.Position;
writer.Write(dir.DecompressedData);
}
//Now go back and update the positions
for (int i = 0; i < dirs.Length; i++)
{
writer.Position = dirOffsets[i];
writer.WriteUInt32((uint)tableOffsets[i]);
}
}
