////////////////////////////////////////////////////////////////////
// build new cmap table
////////////////////////////////////////////////////////////////////
private void BuildCharMapTable()
{
// create a new cmap sub table
cmapSubTbl NewSubTbl = new cmapSubTbl(cmapSubTbl.PlatformID, cmapSubTbl.EncodingID, 4);
NewSubTbl.Language = cmapSubTbl.Language;
NewSubTbl.SegCount = 2;
NewSubTbl.SegArray = new cmapSeg[2];
NewSubTbl.GlyphArray = CharToGlyphArray;
// test type of font
if(cmapSubTbl.EncodingID != 0)
// alphabetic font
NewSubTbl.SegArray[0] = new cmapSeg(FirstChar, LastChar, 0, 2);
else
// symbolic font
NewSubTbl.SegArray[0] = new cmapSeg(0xf000 + FirstChar, 0xf000 + LastChar, 0, 2);
NewSubTbl.SegArray[1] = new cmapSeg(0xffff, 0xffff, 1, 0);
// table size
Int32 TblSize = 4 + 8 + 16 + 8 * NewSubTbl.SegCount + 2 * CharToGlyphArray.Length;
Buffer = new Byte[TblSize];
BufPtr = 0;
// table version number is 0
WriteUInt16BigEndian(0);
// number of tables is 1
WriteUInt16BigEndian(1);
// platform id
WriteUInt16BigEndian(NewSubTbl.PlatformID);
// encoding id
WriteUInt16BigEndian(NewSubTbl.EncodingID);
// offset
WriteUInt32BigEndian(4 + 8);
// format
WriteUInt16BigEndian(NewSubTbl.Format);
// table length
WriteInt16BigEndian((16 + 8 * NewSubTbl.SegCount + 2 * CharToGlyphArray.Length));
// language
WriteUInt16BigEndian(NewSubTbl.Language);
// segment count times 2
WriteInt16BigEndian((NewSubTbl.SegCount * 2));
// search range
WriteUInt16BigEndian(NewSubTbl.SearchRange);
// entry selector
WriteUInt16BigEndian(NewSubTbl.EntrySelector);
// range shift
WriteUInt16BigEndian(NewSubTbl.RangeShift);
// end character
for(Int32 Seg = 0; Seg < NewSubTbl.SegCount; Seg++) WriteUInt16BigEndian(NewSubTbl.SegArray[Seg].EndChar);
// padding
WriteUInt16BigEndian(0);
// start character
for(Int32 Seg = 0; Seg < NewSubTbl.SegCount; Seg++) WriteUInt16BigEndian(NewSubTbl.SegArray[Seg].StartChar);
// IDDelta
for(Int32 Seg = 0; Seg < NewSubTbl.SegCount; Seg++) WriteInt16BigEndian(NewSubTbl.SegArray[Seg].IDDelta);
// IDRangeOffset
for(Int32 Seg = 0; Seg < NewSubTbl.SegCount; Seg++) WriteUInt16BigEndian((UInt16) (NewSubTbl.SegArray[Seg].IDRangeOffset * 2));
// char to glyph translation
for(Int32 Glyph = 0; Glyph < NewSubTbl.GlyphArray.Length; Glyph++) WriteUInt16BigEndian(NewSubTbl.GlyphArray[Glyph]);
// save
TableRecordArray[(Int32) Tag.cmap].Data = Buffer;
// calculate checksum
TableRecordArray[(Int32) Tag.cmap].Checksum = TableChecksum(Buffer);
// exit
return;
}
////////////////////////////////////////////////////////////////////
// Read "cmap" table
////////////////////////////////////////////////////////////////////
private void GetcmapTable()
{
// set buffer for decoding
Buffer = TableRecordArray[(Int32) Tag.cmap].Data;
BufPtr = 0;
// create cmap object
if(ReadUInt16BigEndian() != 0) throw new ApplicationException("CMAP table version number is not zero");
Int32 NumberOfTables = ReadUInt16BigEndian();
cmapSubTbl[] SubTblArray = new cmapSubTbl[NumberOfTables];
// loop for tables
for(Int32 Index = 0; Index < NumberOfTables; Index++)
{
cmapSubTbl SubTbl = new cmapSubTbl();
SubTblArray[Index] = SubTbl;
SubTbl.PlatformID = ReadUInt16BigEndian();
SubTbl.EncodingID = ReadUInt16BigEndian();
SubTbl.Offset = ReadUInt32BigEndian();
// save buffer pointer
Int32 SaveBufPtr = BufPtr;
// set offset
BufPtr = (Int32) SubTbl.Offset;
// read format code
SubTbl.Format = ReadUInt16BigEndian();
// process format 0
if(SubTbl.Format == 0)
{
SubTbl.Length = ReadUInt16BigEndian();
SubTbl.Language = ReadUInt16BigEndian();
SubTbl.GlyphArray = new UInt16[256];
for(Int32 Code = 0; Code < 256; Code++) SubTbl.GlyphArray[Code] = Buffer[BufPtr++];
}
// process format 4
else if(SubTbl.Format == 4)
{
SubTbl.Length = ReadUInt16BigEndian();
SubTbl.Language = ReadUInt16BigEndian();
SubTbl.SegCount = (UInt16) (ReadUInt16BigEndian() / 2);
BufPtr += 6; // skip search range, entry selector and range shift
SubTbl.SegArray = new cmapSeg[SubTbl.SegCount];
for(Int32 Seg = 0; Seg < SubTbl.SegCount; Seg++) SubTbl.SegArray[Seg] = new cmapSeg(ReadUInt16BigEndian()); // EndChar
ReadUInt16BigEndian(); // skip reserved padding
for(Int32 Seg = 0; Seg < SubTbl.SegCount; Seg++) SubTbl.SegArray[Seg].StartChar = ReadUInt16BigEndian();
for(Int32 Seg = 0; Seg < SubTbl.SegCount; Seg++) SubTbl.SegArray[Seg].IDDelta = ReadInt16BigEndian();
for(Int32 Seg = 0; Seg < SubTbl.SegCount; Seg++) SubTbl.SegArray[Seg].IDRangeOffset = (UInt16) (ReadUInt16BigEndian() / 2);
Int32 GlyphCount = (SubTbl.Length - 16 - 8 * SubTbl.SegCount) / 2;
SubTbl.GlyphArray = new UInt16[GlyphCount];
for(Int32 Glyph = 0; Glyph < GlyphCount; Glyph++) SubTbl.GlyphArray[Glyph] = ReadUInt16BigEndian();
}
// restore buffer pointer
BufPtr = SaveBufPtr;
}
// sort table
Array.Sort(SubTblArray);
// select 'best' sub-table for character code to glyph code translation
cmapSubTbl = SelectcmapSubTable(SubTblArray);
// exit
return;
}
////////////////////////////////////////////////////////////////////
// Select best sub-table in "cmap" table
////////////////////////////////////////////////////////////////////
private cmapSubTbl SelectcmapSubTable(
cmapSubTbl[] SubTblArray
)
{
// search for platform ID = 3 Windows, encoding ID = 0 or 1 Unicode and format 4
cmapSubTbl SearchSubTbl = new cmapSubTbl(3, (UInt16) (SymbolicFont ? 0 : 1), 4);
Int32 Index = Array.BinarySearch(SubTblArray, SearchSubTbl);
if(Index >= 0) return(SubTblArray[Index]);
// search for platform ID = 3 Windows, encoding ID = 0 or 1 Unicode and format 0
SearchSubTbl.Format = 0;
Index = Array.BinarySearch(SubTblArray, SearchSubTbl);
if(Index >= 0) return(SubTblArray[Index]);
// not found
throw new ApplicationException("Required cmap sub-table is missing");
}
