List of usage examples for org.apache.pdfbox.cos COSDocument isXRefStream
boolean isXRefStream
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From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java
License:Apache License
/** * write the x ref section for the pdf file * * currently, the pdf is reconstructed from the scratch, so we write a * single section//from w w w . j a va 2 s . c om * * todo support for incremental writing? * * @param doc The document to write the xref from. * * @throws IOException If there is an error writing the data to the stream. */ protected void doWriteXRef(COSDocument doc) throws IOException { if (doc.isXRefStream()) { // sort xref, needed only if object keys not regenerated Collections.sort(getXRefEntries()); COSWriterXRefEntry lastEntry = getXRefEntries().get(getXRefEntries().size() - 1); // remember the position where x ref is written setStartxref(getStandardOutput().getPos()); // getStandardOutput().write(XREF); getStandardOutput().writeEOL(); // write start object number and object count for this x ref section // we assume starting from scratch writeXrefRange(0, lastEntry.getKey().getNumber() + 1); // write initial start object with ref to first deleted object and magic generation number writeXrefEntry(COSWriterXRefEntry.getNullEntry()); // write entry for every object long lastObjectNumber = 0; for (Iterator<COSWriterXRefEntry> i = getXRefEntries().iterator(); i.hasNext();) { COSWriterXRefEntry entry = i.next(); while (lastObjectNumber < entry.getKey().getNumber() - 1) { writeXrefEntry(COSWriterXRefEntry.getNullEntry()); } lastObjectNumber = entry.getKey().getNumber(); writeXrefEntry(entry); } } else { COSDictionary trailer = doc.getTrailer(); trailer.setLong(COSName.PREV, doc.getStartXref()); addXRefEntry(COSWriterXRefEntry.getNullEntry()); // sort xref, needed only if object keys not regenerated Collections.sort(getXRefEntries()); // remember the position where x ref was written setStartxref(getStandardOutput().getPos()); getStandardOutput().write(XREF); getStandardOutput().writeEOL(); // write start object number and object count for this x ref section // we assume starting from scratch Integer[] xRefRanges = getXRefRanges(getXRefEntries()); int xRefLength = xRefRanges.length; int x = 0; int j = 0; while (x < xRefLength && (xRefLength % 2) == 0) { writeXrefRange(xRefRanges[x], xRefRanges[x + 1]); for (int i = 0; i < xRefRanges[x + 1]; ++i) { writeXrefEntry(xRefEntries.get(j++)); } x += 2; } } }
From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java
License:Apache License
private void doWriteXRefInc(COSDocument doc, long hybridPrev) throws IOException, COSVisitorException { if (doc.isXRefStream() || hybridPrev != -1) { // the file uses XrefStreams, so we need to update // it with an xref stream. We create a new one and fill it // with data available here // first set an entry for the null entry in the xref table // this is probably not necessary // addXRefEntry(COSWriterXRefEntry.getNullEntry()); // create a new XRefStrema object PDFXRefStream pdfxRefStream = new PDFXRefStream(); // add all entries from the incremental update. List<COSWriterXRefEntry> xRefEntries2 = getXRefEntries(); for (COSWriterXRefEntry cosWriterXRefEntry : xRefEntries2) { pdfxRefStream.addEntry(cosWriterXRefEntry); }//from w w w .j a v a 2 s. c o m COSDictionary trailer = doc.getTrailer(); // trailer.setLong(COSName.PREV, hybridPrev == -1 ? prev : hybridPrev); trailer.setLong(COSName.PREV, doc.getStartXref()); pdfxRefStream.addTrailerInfo(trailer); // the size is the highest object number+1. we add one more // for the xref stream object we are going to write pdfxRefStream.setSize(getNumber() + 2); setStartxref(getStandardOutput().getPos()); COSStream stream2 = pdfxRefStream.getStream(); doWriteObject(stream2); } if (!doc.isXRefStream() || hybridPrev != -1) { COSDictionary trailer = doc.getTrailer(); trailer.setLong(COSName.PREV, doc.getStartXref()); if (hybridPrev != -1) { COSName xrefStm = COSName.XREF_STM; trailer.removeItem(xrefStm); trailer.setLong(xrefStm, getStartxref()); } addXRefEntry(COSWriterXRefEntry.getNullEntry()); // sort xref, needed only if object keys not regenerated Collections.sort(getXRefEntries()); // remember the position where x ref was written setStartxref(getStandardOutput().getPos()); getStandardOutput().write(XREF); getStandardOutput().writeEOL(); // write start object number and object count for this x ref section // we assume starting from scratch Integer[] xRefRanges = getXRefRanges(getXRefEntries()); int xRefLength = xRefRanges.length; int x = 0; int j = 0; while (x < xRefLength && (xRefLength % 2) == 0) { writeXrefRange(xRefRanges[x], xRefRanges[x + 1]); for (int i = 0; i < xRefRanges[x + 1]; ++i) { writeXrefEntry(xRefEntries.get(j++)); } x += 2; } } }
From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java
License:Apache License
/** * The visit from document method./*from w w w .ja v a 2s . c o m*/ * * @param doc The object that is being visited. * * @throws COSVisitorException If there is an exception while visiting this * object. * * @return null */ public Object visitFromDocument(COSDocument doc) throws COSVisitorException { try { if (!incrementalUpdate) { doWriteHeader(doc); } doWriteBody(doc); // get the previous trailer COSDictionary trailer = doc.getTrailer(); long hybridPrev = -1; if (trailer != null) { hybridPrev = trailer.getLong(COSName.XREF_STM); } if (incrementalUpdate) { doWriteXRefInc(doc, hybridPrev); } else { doWriteXRef(doc); } // the trailer section should only be used for xref tables not for xref streams if (!incrementalUpdate || !doc.isXRefStream() || hybridPrev != -1) { doWriteTrailer(doc); } // write endof getStandardOutput().write(STARTXREF); getStandardOutput().writeEOL(); getStandardOutput().write(String.valueOf(getStartxref()).getBytes("ISO-8859-1")); getStandardOutput().writeEOL(); getStandardOutput().write(EOF); getStandardOutput().writeEOL(); if (incrementalUpdate) { doWriteSignature(doc); } return null; } catch (IOException e) { throw new COSVisitorException(e); } catch (SignatureException e) { throw new COSVisitorException(e); } }