| Code with Finding: |
class PdfReader {
protected boolean readXRefStream(final long ptr) throws IOException {
tokens.seek(ptr);
int thisStream = 0;
if (!tokens.nextToken())
return false;
if (tokens.getTokenType() != TokenType.NUMBER)
return false;
thisStream = tokens.intValue();
if (!tokens.nextToken() || tokens.getTokenType() != TokenType.NUMBER)
return false;
if (!tokens.nextToken() || !tokens.getStringValue().equals("obj"))
return false;
PdfObject object = readPRObject();
PRStream stm = null;
if (object.isStream()) {
stm = (PRStream)object;
if (!PdfName.XREF.equals(stm.get(PdfName.TYPE)))
return false;
}
else
return false;
if (trailer == null) {
trailer = new PdfDictionary();
trailer.putAll(stm);
}
stm.setLength(((PdfNumber)stm.get(PdfName.LENGTH)).intValue());
int size = ((PdfNumber)stm.get(PdfName.SIZE)).intValue();
PdfArray index;
PdfObject obj = stm.get(PdfName.INDEX);
if (obj == null) {
index = new PdfArray();
index.add(new int[]{0, size});
}
else
index = (PdfArray)obj;
PdfArray w = (PdfArray)stm.get(PdfName.W);
long prev = -1;
obj = stm.get(PdfName.PREV);
if (obj != null)
prev = ((PdfNumber)obj).longValue();
// Each xref pair is a position
// type 0 -> -1, 0
// type 1 -> offset, 0
// type 2 -> index, obj num
ensureXrefSize(size * 2);
if (objStmMark == null && !partial)
objStmMark = new HashMap<Integer, IntHashtable>();
if (objStmToOffset == null && partial)
objStmToOffset = new LongHashtable();
byte b[] = getStreamBytes(stm, tokens.getFile());
int bptr = 0;
int wc[] = new int[3];
for (int k = 0; k < 3; ++k)
wc[k] = w.getAsNumber(k).intValue();
for (int idx = 0; idx < index.size(); idx += 2) {
int start = index.getAsNumber(idx).intValue();
int length = index.getAsNumber(idx + 1).intValue();
ensureXrefSize((start + length) * 2);
while (length-- > 0) {
int type = 1;
if (wc[0] > 0) {
type = 0;
for (int k = 0; k < wc[0]; ++k)
type = (type << 8) + (b[bptr++] & 0xff);
}
long field2 = 0;
for (int k = 0; k < wc[1]; ++k)
field2 = (field2 << 8) + (b[bptr++] & 0xff);
int field3 = 0;
for (int k = 0; k < wc[2]; ++k)
field3 = (field3 << 8) + (b[bptr++] & 0xff);
int base = start * 2;
if (xref[base] == 0 && xref[base + 1] == 0) {
switch (type) {
case 0:
xref[base] = -1;
break;
case 1:
xref[base] = field2;
break;
case 2:
xref[base] = field3;
xref[base + 1] = field2;
if (partial) {
objStmToOffset.put(field2, 0);
}
else {
Integer on = Integer.valueOf((int)field2);
IntHashtable seq = objStmMark.get(on);
if (seq == null) {
seq = new IntHashtable();
seq.put(field3, 1);
objStmMark.put(on, seq);
}
else
seq.put(field3, 1);
}
break;
}
}
++start;
}
}
thisStream *= 2;
if (thisStream < xref.length)
xref[thisStream] = -1;
if (prev == -1)
return true;
return readXRefStream(prev);
}
}
|
