private void ReadFormat4CMap(Stream stream, EncodingRecord er)
{
byte[] buffer = new byte[9];
stream.Read(buffer, 0, 8);
int segCount = (IOUtils.GetShort(buffer, 0) & 0xFFFF) / 2;
short[] endCount = ReadShorts(stream,segCount);
stream.Read(buffer, 0, 2);
short[] startCount = ReadShorts(stream, segCount);
short[] idDelta = ReadShorts(stream, segCount);
short[] idRangeOffset = ReadShorts(stream, segCount);
int lengthRemains = er.Length - 16 - 8 * segCount;
short[] glyphIds = ReadShorts(stream,lengthRemains);
for (int i = 0; i < segCount; i++)
{
int start = startCount[i] & 0xFFFF;
int end = endCount[i] & 0xFFFF;
short rangeOffset = (short)(idRangeOffset[i] / 2);
short delta = idDelta[i];
for (int ch = start; ch <= end; ch++)
{
CharacterData data = new CharacterData();
if (rangeOffset == 0)
{
data.GlyphIndex = (short) (ch + delta);
}
else
{
int index = ch - start + rangeOffset - (segCount - i);
int glyphIndex = glyphIds[index];
if (glyphIndex != 0)
{
glyphIndex += delta;
}
data.GlyphIndex = (short) glyphIndex;
}
characters.Add(ch,data);
}
}
}
private void ReadCMap(Stream stream)
{
TableDirectoryEntry cmap = Header.TableMap["cmap"];
if (cmap == null)
{
throw new Exception("No cmap table found");
}
stream.Seek(cmap.Offset, SeekOrigin.Begin);
byte[] buffer = new byte[9];
stream.Read(buffer, 0, 4);
if (IOUtils.GetShort(buffer,0)!=0)
{
throw new Exception("Unknown cmap version");
}
int encCount = IOUtils.GetShort(buffer, 2);
List<EncodingRecord> encs = new List<EncodingRecord>();
for (int i = 0; i < encCount; i++)
{
EncodingRecord er = new EncodingRecord();
encs.Add(er);
stream.Read(buffer, 0, 8);
er.PlatformID = IOUtils.GetShort(buffer, 0);
er.EncodingID = IOUtils.GetShort(buffer, 2);
er.Offset = IOUtils.GetInt(buffer, 4) + cmap.Offset;
}
foreach (var er in encs)
{
stream.Seek(er.Offset, SeekOrigin.Begin);
stream.Read(buffer, 0, 6);
er.Format = IOUtils.GetShort(buffer, 0);
er.Length = IOUtils.GetShort(buffer, 2) & 0xFFFF;
er.Language = IOUtils.GetShort(buffer, 4);
if (er.PlatformID == (short)PlatformId.Microsoft && er.EncodingID == 1)
{
// Unicode
if (er.Format == 4)
{
ReadFormat4CMap(stream,er);
}
}
}
}
