static CMap createCMap(Buffer buffer, int offset) {
/* First do a sanity check that this cmap subtable is contained
* within the cmap table.
*/
int subtableFormat = buffer.getChar(offset);
switch (subtableFormat) {
case 0:
return new CMapFormat0(buffer, offset);
case 2:
return new CMapFormat2(buffer, offset);
case 4:
return new CMapFormat4(buffer, offset);
case 6:
return new CMapFormat6(buffer, offset);
case 8:
return new CMapFormat8(buffer, offset);
case 10:
return new CMapFormat10(buffer, offset);
case 12:
return new CMapFormat12(buffer, offset);
default:
throw new RuntimeException("Cmap format unimplemented: " + (int) buffer.getChar(offset));
}
}
CMapFormat6(Buffer buffer, int offset) {
buffer.position(offset + 6);
firstCode = buffer.getChar();
entryCount = buffer.getChar();
glyphIdArray = new char[entryCount];
for (int i = 0; i < entryCount; i++) {
glyphIdArray[i] = buffer.getChar();
}
}
CMapFormat0(Buffer buffer, int offset) {
/* skip 6 bytes of format, length, and version */
int len = buffer.getChar(offset + 2);
cmap = new byte[len - 6];
buffer.get(offset + 6, cmap, 0, len - 6);
}
CMapFormat2(Buffer buffer, int offset) {
int tableLen = buffer.getChar(offset + 2);
buffer.position(offset + 6);
char maxSubHeader = 0;
for (int i = 0; i < 256; i++) {
subHeaderKey[i] = buffer.getChar();
if (subHeaderKey[i] > maxSubHeader) {
maxSubHeader = subHeaderKey[i];
}
}
/* The value of the subHeaderKey is 8 * the subHeader index,
* so the number of subHeaders can be obtained by dividing
* this value bv 8 and adding 1.
*/
int numSubHeaders = (maxSubHeader >> 3) + 1;
firstCodeArray = new char[numSubHeaders];
entryCountArray = new char[numSubHeaders];
idDeltaArray = new short[numSubHeaders];
idRangeOffSetArray = new char[numSubHeaders];
for (int i = 0; i < numSubHeaders; i++) {
firstCodeArray[i] = buffer.getChar();
entryCountArray[i] = buffer.getChar();
idDeltaArray[i] = (short) buffer.getChar();
idRangeOffSetArray[i] = buffer.getChar();
}
int glyphIndexArrSize = (tableLen - 518 - numSubHeaders * 8) / 2;
glyphIndexArray = new char[glyphIndexArrSize];
for (int i = 0; i < glyphIndexArrSize; i++) {
glyphIndexArray[i] = buffer.getChar();
}
}
CMapFormat10(Buffer buffer, int offset) {
buffer.position(offset + 12);
startCharCode = buffer.getInt() & INTMASK;
numChars = buffer.getInt() & INTMASK;
glyphIdArray = new char[numChars];
for (int i = 0; i < numChars; i++) {
glyphIdArray[i] = buffer.getChar();
}
}
CMapFormat4(Buffer buffer, int offset) {
buffer.position(offset);
buffer.getChar(); // skip, we already know format=4
int subtableLength = buffer.getChar();
/* Try to recover from some bad fonts which specify a subtable
* length that would overflow the byte buffer holding the whole
* cmap table. If this isn't a recoverable situation an exception
* may be thrown which is caught higher up the call stack.
* Whilst this may seem lenient, in practice, unless the "bad"
* subtable we are using is the last one in the cmap table we
* would have no way of knowing about this problem anyway.
*/
if (offset + subtableLength > buffer.capacity()) {
subtableLength = buffer.capacity() - offset;
}
buffer.getChar(); // skip language
segCount = buffer.getChar() / 2;
buffer.getChar(); // skip searchRange
entrySelector = buffer.getChar();
rangeShift = buffer.getChar() / 2;
startCount = new char[segCount];
endCount = new char[segCount];
idDelta = new short[segCount];
idRangeOffset = new char[segCount];
for (int i = 0; i < segCount; i++) {
endCount[i] = buffer.getChar();
}
buffer.getChar(); // 2 bytes for reserved pad
for (int i = 0; i < segCount; i++) {
startCount[i] = buffer.getChar();
}
for (int i = 0; i < segCount; i++) {
idDelta[i] = (short) buffer.getChar();
}
for (int i = 0; i < segCount; i++) {
char ctmp = buffer.getChar();
idRangeOffset[i] = (char) ((ctmp >> 1) & 0xffff);
}
/* Can calculate the number of glyph IDs by subtracting
* "pos" from the length of the cmap
*/
int pos = (segCount * 8 + 16) / 2;
buffer.position(pos * 2 + offset); // * 2 for chars
int numGlyphIds = (subtableLength / 2 - pos);
glyphIds = new char[numGlyphIds];
for (int i = 0; i < numGlyphIds; i++) {
glyphIds[i] = buffer.getChar();
}
}
