public void nextValidToken() throws IOException {
int level = 0;
String n1 = null;
String n2 = null;
int ptr = 0;
while (nextToken()) {
if (type == TK_COMMENT) continue;
switch (level) {
case 0:
{
if (type != TK_NUMBER) return;
ptr = file.getFilePointer();
n1 = stringValue;
++level;
break;
}
case 1:
{
if (type != TK_NUMBER) {
file.seek(ptr);
type = TK_NUMBER;
stringValue = n1;
return;
}
n2 = stringValue;
++level;
break;
}
default:
{
if (type != TK_OTHER || !stringValue.equals("R")) {
file.seek(ptr);
type = TK_NUMBER;
stringValue = n1;
return;
}
type = TK_REF;
reference = Integer.valueOf(n1).intValue();
generation = Integer.valueOf(n2).intValue();
return;
}
}
}
throwError("Unexpected end of file");
}
public int getStartxref() throws IOException {
int size = Math.min(1024, file.length());
int pos = file.length() - size;
file.seek(pos);
String str = readString(1024);
int idx = str.lastIndexOf("startxref");
if (idx < 0) throw new IOException("PDF startxref not found.");
return pos + idx;
}
public void seek(int pos) throws IOException {
file.seek(pos);
}