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); } }