static byte[] getBytes(final long start, final int count, final RandomAccessBuffer pdf_datafile) {
final byte[] buffer = new byte[count];
try {
pdf_datafile.seek(start);
pdf_datafile.read(buffer); // get next chars
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
return buffer;
}
void closeFile() throws IOException {
if (pdf_datafile != null) {
pdf_datafile.close();
pdf_datafile = null;
}
}
/** returns current location pointer and sets to new value */
public void movePointer(final long pointer) {
try {
// make sure inside file
if (pointer > pdf_datafile.length()) {
if (LogWriter.isOutput()) {
LogWriter.writeLog("Attempting to access ref outside file");
}
// throw new PdfException("Exception moving file pointer - ref outside file");
} else {
pdf_datafile.seek(pointer);
}
} catch (final Exception e) {
if (LogWriter.isOutput()) {
LogWriter.writeLog("Exception " + e + " moving pointer to " + pointer + " in file.");
}
}
}
byte[] getBytes(final long start, final int count) {
final byte[] buffer = new byte[count];
if (start >= 0) {
try {
pdf_datafile.seek(start);
pdf_datafile.read(buffer); // get next chars
} catch (final IOException e) {
// tell user and log
if (LogWriter.isOutput()) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
//
}
}
return buffer;
}
/**
* read reference table start to see if new 1.5 type or traditional xref
*
* @throws PdfException
*/
public final PdfObject readReferenceTable(
final PdfObject linearObj,
final PdfFileReader currentPdfFile,
final ObjectReader objectReader)
throws PdfException {
int pointer = -1;
final int eof = (int) this.eof;
boolean islinearizedCompressed = false;
if (linearObj == null) {
pointer = readFirstStartRef();
} else { // find at start of Linearized
final byte[] data = pdf_datafile.getPdfBuffer();
final int count = data.length;
int ptr = 5;
for (int i = 0; i < count; i++) {
// track start of this object (needed for compressed)
if (data[i] == 'e'
&& data[i + 1] == 'n'
&& data[i + 2] == 'd'
&& data[i + 3] == 'o'
&& data[i + 4] == 'b'
&& data[i + 5] == 'j') {
ptr = i + 6;
}
if (data[i] == 'x' && data[i + 1] == 'r' && data[i + 2] == 'e' && data[i + 3] == 'f') {
pointer = i;
i = count;
} else if (data[i] == 'X'
&& data[i + 1] == 'R'
&& data[i + 2] == 'e'
&& data[i + 3] == 'f') {
islinearizedCompressed = true;
pointer = ptr;
while (data[pointer] == 10 || data[pointer] == 13 || data[pointer] == 32) {
pointer++;
}
i = count;
}
}
}
offset.addXref(pointer);
PdfObject rootObj = null;
if (pointer >= eof || pointer == 0) {
if (LogWriter.isOutput()) {
LogWriter.writeLog("Pointer not if file - trying to manually find startref");
}
offset.setRefTableInvalid(true);
try {
rootObj = new PageObject(BrokenRefTable.findOffsets(pdf_datafile, offset));
} catch (Error err) {
throw new PdfException(err.getMessage() + " attempting to manually scan file for objects");
}
currentPdfFile.readObject(rootObj);
return rootObj;
} else if (islinearizedCompressed || isCompressedStream(pointer, eof)) {
return readCompressedStream(rootObj, pointer, currentPdfFile, objectReader, linearObj);
} else {
return readLegacyReferenceTable(rootObj, pointer, eof, currentPdfFile);
}
}