/**
* Stores the next object of the XRef table. As soon as this method returns false, it makes no
* longer sense calling it as all the objects have been stored.
*
* @return false if there are no objects left to check.
*/
public boolean storeNextObject() {
while (current < n) {
current++;
PdfObject object = reader.getPdfObjectRelease(current);
if (object != null) {
int idx = size();
idxToRef.put(idx, current);
refToIdx.put(current, idx);
store(object);
return true;
}
}
return false;
}
/**
* Reads the kerning information from the 'kern' table.
*
* @throws IOException the font file could not be read
*/
void readKerning() throws IOException {
int table_location[];
table_location = (int[]) positionTables.get("kern");
if (table_location == null) return;
rf.seek(table_location[0] + 2);
int nTables = rf.readUnsignedShort();
int checkpoint = table_location[0] + 4;
int length = 0;
for (int k = 0; k < nTables; ++k) {
checkpoint += length;
rf.seek(checkpoint);
rf.skipBytes(2);
length = rf.readUnsignedShort();
int coverage = rf.readUnsignedShort();
if ((coverage & 0xfff7) == 0x0001) {
int nPairs = rf.readUnsignedShort();
rf.skipBytes(6);
for (int j = 0; j < nPairs; ++j) {
int pair = rf.readInt();
int value = ((int) rf.readShort() * 1000) / head.unitsPerEm;
kerning.put(pair, value);
}
}
}
}
/**
* Gets the reference number in the xref table based on the index in the indirect object list.
*
* @param i the index of an object in the indirect object list
* @return the corresponding reference number in the xref table
*/
public int getRefByIndex(int i) {
return idxToRef.get(i);
}
/**
* Gets the index of an object based on its number in the xref table.
*
* @param ref a number in the xref table
* @return the index in the list of indirect objects
*/
public int getIndexByRef(int ref) {
return refToIdx.get(ref);
}
