private byte[] BuildOS2(TableDirectoryEntry oldOS2)
{
MemoryStream outStream = new MemoryStream();
IOUtils.WriteShort(outStream, Os2version);
short xAvgCharWidth = CalculateAverageWeight();
IOUtils.WriteShort(outStream,xAvgCharWidth);
IOUtils.WriteShort(outStream,Weight);
IOUtils.WriteShort(outStream, Width);
IOUtils.WriteShort(outStream, FsType);
IOUtils.WriteShort(outStream, SubscriptXSize);
IOUtils.WriteShort(outStream, SubscriptYSize);
IOUtils.WriteShort(outStream, SubscriptXOffset);
IOUtils.WriteShort(outStream, SubscriptYOffset);
IOUtils.WriteShort(outStream, SuperscriptXSize);
IOUtils.WriteShort(outStream, SuperscriptYSize);
IOUtils.WriteShort(outStream, SuperscriptXOffset);
IOUtils.WriteShort(outStream, SuperscriptYOffset);
IOUtils.WriteShort(outStream, StrikeoutSize);
IOUtils.WriteShort(outStream, StrikeoutPosition);
IOUtils.WriteShort(outStream, FamilyClass);
outStream.Write(panos,0,10);
if (Os2version == 0)
{
IOUtils.WriteInt(outStream, CharRange);
}
else
{
// TODO: calculate and adjust the ranges that really present in the font according to version 4 of the table
IOUtils.WriteInt(outStream, UnicodeRange1);
IOUtils.WriteInt(outStream, UnicodeRange2);
IOUtils.WriteInt(outStream, UnicodeRange3);
IOUtils.WriteInt(outStream, UnicodeRange4);
}
Encoding isoEncoding = Encoding.GetEncoding("iso-8859-1");
outStream.Write(isoEncoding.GetBytes(achVendID,0,4),0,4);
IOUtils.WriteShort(outStream, fsSelection);
int firstCharIndex = GetNewFirstIndex();
IOUtils.WriteShort(outStream,firstCharIndex);
int lastCharIndex = GetNewLastIndex();
IOUtils.WriteShort(outStream,lastCharIndex);
IOUtils.WriteShort(outStream, TypoAscender);
IOUtils.WriteShort(outStream, TypoDescender);
IOUtils.WriteShort(outStream, TypoLineGap);
IOUtils.WriteShort(outStream, WinAscent);
IOUtils.WriteShort(outStream, WinDescent);
if (Os2version == 0)
{
return outStream.ToArray();
}
// TODO: recalculate codepages in case version 0 or wrong
IOUtils.WriteInt(outStream, CodePageRange1);
IOUtils.WriteInt(outStream, CodePageRange2);
if (Os2version == 1)
{
return outStream.ToArray();
}
// TODO: add calculations in case default not set
IOUtils.WriteShort(outStream, Height);
IOUtils.WriteShort(outStream, CapHeight);
IOUtils.WriteShort(outStream, DefaultChar);
IOUtils.WriteShort(outStream, BreakChar);
IOUtils.WriteShort(outStream, MaxContext);
return outStream.ToArray();
}
private byte[] BuildMaxP(TableDirectoryEntry maxp)
{
byte[] buf = new byte[maxp.Length]; // expect at least 6 byte long
inputStream.Seek(maxp.Offset, SeekOrigin.Begin);
inputStream.Read(buf, 0, maxp.Length);
buf[4] = (byte)(NewGlyphCount >> 8);
buf[5] = (byte)(NewGlyphCount);
return buf;
}
private byte[] BuildHead(TableDirectoryEntry head, bool shortOffsets)
{
byte[] buf = new byte[head.Length]; // expect 54 bytes long
inputStream.Seek(head.Offset, SeekOrigin.Begin);
inputStream.Read(buf, 0, head.Length);
buf[8] = 0; // zero out checkSumAdjustment
buf[9] = 0;
buf[10] = 0;
buf[11] = 0;
IOUtils.StuffLong(buf, 28, DateTime.Now.Ticks / 1000 + baseTime);
buf[50] = 0;
buf[51] = (byte)(shortOffsets ? 0 : 1);
return buf;
}
private byte[] BuildHHea(TableDirectoryEntry hhea)
{
byte[] buf = new byte[hhea.Length]; // expect 36 bytes long
inputStream.Seek(hhea.Offset, SeekOrigin.Begin);
inputStream.Read(buf, 0, hhea.Length);
advanceWidthMax = CalculateAdvanceWidthMax();
buf[10] = (byte)(advanceWidthMax>>8);
buf[11] = (byte) (advanceWidthMax);
buf[34] = (byte)(NewVariableWidthCount >> 8);
buf[35] = (byte)(NewVariableWidthCount);
return buf;
}
public void Load(Stream stream)
{
byte[] buffer = new byte[256];
int readResult = stream.Read(buffer, 0, 12);
if ( readResult != 12)
{
throw new Exception(string.Format("could not read {0} bytes",12));
}
int version = IOUtils.GetInt(buffer, 0);
switch (version)
{
case 0x74746366: // TrueType collection file
// we can only read the first font in the collection
stream.Read(buffer, 0, 4);
stream.Seek(IOUtils.GetInt(buffer, 0), SeekOrigin.Begin);
stream.Read(buffer, 0, 12);
version = IOUtils.GetInt(buffer, 0);
break;
case 0x00010000: // regular TrueType
break;
case 0x4f54544f: // CFF based
break;
default:
throw new Exception("Invalid OpenType file");
}
Version = version;
NumTables = IOUtils.GetShort(buffer, 4);
SearchRange = IOUtils.GetShort(buffer, 6);
EntrySelector = IOUtils.GetShort(buffer, 8);
RangeShift = IOUtils.GetShort(buffer, 10);
tableDirectory.Clear();
for (int i = 0; i < NumTables; i++)
{
TableDirectoryEntry entry = new TableDirectoryEntry();
stream.Read(buffer, 0, 16);
char[] arr = { (char)(buffer[0] & 0xFF),
(char)(buffer[1] & 0xFF),
(char)(buffer[2] & 0xFF),
(char)(buffer[3] & 0xFF) };
int len = buffer[0] == 0 ? 0 : (buffer[1] == 0 ? 1 : (buffer[2] == 0 ? 2 : (buffer[3] == 0 ? 3 : 4)));
entry.Identifier = new string(arr,0,len);
entry.CheckSum = IOUtils.GetInt(buffer, 4);
entry.Offset = IOUtils.GetInt(buffer, 8);
entry.Length = IOUtils.GetInt(buffer, 12);
tableDirectory.Add(entry);
tableMap.Add(entry.Identifier,entry);
}
}
