public static bool CanRead(BigEndianReader reader)
{
long oldpos = reader.Position;
reader.Position = 0;
TrueTypeHeader header;
bool b = TrueTypeHeader.TryReadHeader(reader, out header);
reader.Position = oldpos;
return(b);
}
protected void Read(BigEndianReader reader)
{
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);
}
dirs.Sort(delegate(TrueTypeTableEntry one, TrueTypeTableEntry two) { return(one.Offset.CompareTo(two.Offset)); });
this._dirs = new TrueTypeTableEntryList(dirs);
this._head = header;
TrueTypeTableFactory factory = this.GetFactory(header);
foreach (TrueTypeTableEntry dir in dirs)
{
TrueTypeFontTable tbl = factory.ReadTable(dir, this, reader);
if (tbl != null)
{
dir.SetTable(tbl);
}
}
}
catch (Exception ex) { throw new TypefaceReadException("Could not read the TTF File", ex); }
}
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);
}
}
