/**
* read 1.5 compression stream ref table
*
* @throws PdfException
*/
private PdfObject readCompressedStream(
PdfObject rootObj,
int pointer,
final PdfFileReader currentPdfFile,
final ObjectReader objectReader,
final PdfObject linearObj)
throws PdfException {
while (pointer != -1) {
/** get values to read stream ref */
movePointer(pointer);
final byte[] raw = objectReader.readObjectData(-1, null);
/** read the object name from the start */
final StringBuilder objectName = new StringBuilder();
char current1, last = ' ';
int matched = 0, i1 = 0;
while (i1 < raw.length) {
current1 = (char) raw[i1];
// treat returns same as spaces
if (current1 == 10 || current1 == 13) {
current1 = ' ';
}
if (current1 == ' ' && last == ' ') { // lose duplicate or spaces
matched = 0;
} else if (current1 == pattern.charAt(matched)) { // looking for obj at end
matched++;
} else {
matched = 0;
objectName.append(current1);
}
if (matched == 3) {
break;
}
last = current1;
i1++;
}
// add end and put into Map
objectName.append('R');
final PdfObject pdfObject = new CompressedObject(objectName.toString());
pdfObject.setCompressedStream(true);
final ObjectDecoder objectDecoder = new ObjectDecoder(currentPdfFile);
objectDecoder.readDictionaryAsObject(pdfObject, 0, raw);
// read the field sizes
final int[] fieldSizes = pdfObject.getIntArray(PdfDictionary.W);
// read the xrefs stream
byte[] xrefs = pdfObject.getDecodedStream();
// if encr
if (xrefs == null) {
xrefs = currentPdfFile.readStream(pdfObject, true, true, false, false, true, null);
}
final int[] Index = pdfObject.getIntArray(PdfDictionary.Index);
if (Index == null) { // single set of values
// System.out.println("-------------1.Offsets-------------"+current+" "+numbEntries);
CompressedObjects.readCompressedOffsets(
0, 0, pdfObject.getInt(PdfDictionary.Size), fieldSizes, xrefs, offset, pdf_datafile);
} else { // pairs of values in Index[] array
final int count = Index.length;
int pntr = 0;
for (int aa = 0; aa < count; aa += 2) {
// System.out.println("-------------2.Offsets-------------"+Index[aa]+" "+Index[aa+1]);
pntr =
CompressedObjects.readCompressedOffsets(
pntr, Index[aa], Index[aa + 1], fieldSizes, xrefs, offset, pdf_datafile);
}
}
/**
* now process trailer values - only first set of table values for root, encryption and info
*/
if (rootObj == null) {
rootObj = pdfObject.getDictionary(PdfDictionary.Root);
/** handle encryption */
encryptObj = pdfObject.getDictionary(PdfDictionary.Encrypt);
if (encryptObj != null) {
final byte[][] IDs = pdfObject.getStringArray(PdfDictionary.ID);
if (IDs != null && this.ID == null) {
// only the first encountered ID should be used as a fileID for decryption
this.ID = IDs[0];
}
}
infoObject = pdfObject.getDictionary(PdfDictionary.Info);
}
// make sure first values used if several tables and code for prev so long as not linearized
// may need adjusting as more examples turn up
if (linearObj != null) {
pointer = -1;
} else {
pointer = pdfObject.getInt(PdfDictionary.Prev);
// a non-compressed object table can follow a compressed one so we need to allow for this
if (!isCompressedStream(pointer, (int) eof)) {
return readLegacyReferenceTable(rootObj, pointer, (int) eof, currentPdfFile);
}
}
}
return rootObj;
}
/** read reference table from file so we can locate objects in pdf file and read the trailers */
private PdfObject readLegacyReferenceTable(
PdfObject rootObj, int pointer, final int eof, final PdfFileReader currentPdfFile)
throws PdfException {
int endTable, current = 0; // current object number
byte[] Bytes;
int bufSize = 1024;
/** read and decode 1 or more trailers */
while (true) {
try {
// allow for pointer outside file
Bytes = Trailer.readTrailer(bufSize, pointer, eof, pdf_datafile);
} catch (final Exception e) {
try {
closeFile();
} catch (final IOException e1) {
if (LogWriter.isOutput()) {
LogWriter.writeLog("Exception " + e + " closing file " + e1);
}
}
throw new PdfException("Exception " + e + " reading trailer");
}
if (Bytes == null) // safety catch
{
break;
}
/** get trailer */
int i = 0;
final int maxLen = Bytes.length;
// for(int a=0;a<100;a++)
// System.out.println((char)Bytes[i+a]);
while (i < maxLen) { // look for trailer keyword
if (Bytes[i] == 116
&& Bytes[i + 1] == 114
&& Bytes[i + 2] == 97
&& Bytes[i + 3] == 105
&& Bytes[i + 4] == 108
&& Bytes[i + 5] == 101
&& Bytes[i + 6] == 114) {
break;
}
i++;
}
// save endtable position for later
endTable = i;
if (i == Bytes.length) {
break;
}
// move to beyond <<
while (Bytes[i] != 60 && Bytes[i - 1] != 60) {
i++;
}
i++;
final PdfObject pdfObject = new CompressedObject("1 0 R");
Dictionary.readDictionary(pdfObject, i, Bytes, -1, true, currentPdfFile, false);
// move to beyond >>
int level = 0;
while (true) {
if (Bytes[i] == 60 && Bytes[i - 1] == 60) {
level++;
i++;
} else if (Bytes[i] == '[') {
i++;
while (Bytes[i] != ']') {
i++;
if (i == Bytes.length) {
break;
}
}
} else if (Bytes[i] == 62 && Bytes[i - 1] == 62) {
level--;
i++;
}
if (level == 0) {
break;
}
i++;
}
// handle optional XRefStm
final int XRefStm = pdfObject.getInt(PdfDictionary.XRefStm);
if (XRefStm != -1) {
pointer = XRefStm;
} else { // usual way
boolean hasRef = true;
/** handle spaces and comments */
while (Bytes[i] == 10 || Bytes[i] == 13) {
i++;
}
while (Bytes[i] == '%') {
while (Bytes[i] != 10) {
i++;
}
i++;
}
/* fix for /Users/markee/Downloads/oneiderapartnerbrochure_web_1371798737.pdf
/**/
// look for xref as end of startref
while (Bytes[i] != 116
&& Bytes[i + 1] != 120
&& Bytes[i + 2] != 114
&& Bytes[i + 3] != 101
&& Bytes[i + 4] != 102) {
if (Bytes[i] == 'o' && Bytes[i + 1] == 'b' && Bytes[i + 2] == 'j') {
hasRef = false;
break;
}
i++;
}
if (hasRef) {
i += 8;
// move to start of value ignoring spaces or returns
while ((i < maxLen) && (Bytes[i] == 10 || Bytes[i] == 32 || Bytes[i] == 13)) {
i++;
}
final int s = i;
// allow for characters between xref and startref
while (i < maxLen && Bytes[i] != 10 && Bytes[i] != 32 && Bytes[i] != 13) {
i++;
}
/** convert xref to string to get pointer */
if (s != i) {
pointer = NumberUtils.parseInt(s, i, Bytes);
}
}
}
i = 0;
// allow for bum data at start
while (Bytes[i] == 13 || Bytes[i] == 10 || Bytes[i] == 9) {
i++;
}
if (pointer == -1) {
if (LogWriter.isOutput()) {
LogWriter.writeLog("No startRef");
}
/** now read the objects for the trailers */
} else if (Bytes[i] == 120
&& Bytes[i + 1] == 114
&& Bytes[i + 2] == 101
&& Bytes[i + 3] == 102) { // make sure starts xref
i = 5;
// move to start of value ignoring spaces or returns
while (Bytes[i] == 10 || Bytes[i] == 32 || Bytes[i] == 13) {
i++;
}
current = offset.readXRefs(current, Bytes, endTable, i, eof, pdf_datafile);
/**
* now process trailer values - only first set of table values for root, encryption and info
*/
if (rootObj == null) {
rootObj = pdfObject.getDictionary(PdfDictionary.Root);
encryptObj = pdfObject.getDictionary(PdfDictionary.Encrypt);
if (encryptObj != null) {
final byte[][] IDs = pdfObject.getStringArray(PdfDictionary.ID);
if (IDs != null && this.ID == null) {
// only the first encountered ID should be used as a fileID for decryption
this.ID = IDs[0];
}
}
infoObject = pdfObject.getDictionary(PdfDictionary.Info);
}
// make sure first values used if several tables and code for prev
pointer = pdfObject.getInt(PdfDictionary.Prev);
// see if other trailers
if (pointer != -1 && pointer < this.eof) {
// reset values for loop
bufSize = 1024;
// track ref table so we can work out object length
offset.addXref(pointer);
} else // reset if fails second test above
{
pointer = -1;
}
} else {
pointer = -1;
// needs to be read to pick up potential /Pages value
//noinspection ObjectAllocationInLoop
rootObj = new PageObject(BrokenRefTable.findOffsets(pdf_datafile, offset));
currentPdfFile.readObject(rootObj);
offset.setRefTableInvalid(true);
}
if (pointer == -1) {
break;
}
}
if (encryptObj == null
&& rootObj != null) { // manual check for broken file (ignore if Encrypted)
int type = -1;
int status = rootObj.getStatus();
byte[] data = rootObj.getUnresolvedData();
try {
final ObjectDecoder objectDecoder = new ObjectDecoder(currentPdfFile);
objectDecoder.checkResolved(rootObj);
type = rootObj.getParameterConstant(PdfDictionary.Type);
} catch (Exception e) { // we need to ignore so just catch, put back as was and log
rootObj.setStatus(status);
rootObj.setUnresolvedData(data, status);
if (LogWriter.isOutput()) {
LogWriter.writeLog("[PDF] Exception reading type on root object " + e);
}
}
// something gone wrong so manually index
if (type == PdfDictionary.Font) { // see 21153 - ref table in wrong order
rootObj = null; // /will reset in code at end
}
}
// something gone wrong so manually index
if (rootObj == null) { // see 21382
offset.clear();
offset.reuse();
// needs to be read to pick up potential /Pages value
//noinspection ObjectAllocationInLoop
rootObj = new PageObject(BrokenRefTable.findOffsets(pdf_datafile, offset));
currentPdfFile.readObject(rootObj);
offset.setRefTableInvalid(true);
}
return rootObj;
}
