Example usage for org.apache.pdfbox.cos COSName PREV

Introduction

In this page you can find the example usage for org.apache.pdfbox.cos COSName PREV.

Prototype

COSName PREV

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Usage

From source file:com.aaasec.sigserv.csspsupport.pdfbox.modifications.CsCOSWriter.java

License:Apache License

/**
 * This will write the trailer to the PDF document.
 *
 * @param doc The document to create the trailer for.
 *
 * @throws IOException If there is an IOError while writing the document.
 * @throws COSVisitorException If there is an error while generating the
 * data./*from  w ww  .  j  a  v  a  2  s .c o m*/
 */
protected void doWriteTrailer(COSDocument doc) throws IOException, COSVisitorException {
    getStandardOutput().write(TRAILER);
    getStandardOutput().writeEOL();

    COSDictionary trailer = doc.getTrailer();
    //sort xref, needed only if object keys not regenerated
    Collections.sort(getXRefEntries());
    COSWriterXRefEntry lastEntry = getXRefEntries().get(getXRefEntries().size() - 1);
    trailer.setInt(COSName.SIZE, (int) lastEntry.getKey().getNumber() + 1);
    // Only need to stay, if an incremental update will be performed
    if (!incrementalUpdate) {
        trailer.removeItem(COSName.PREV);
    }
    // Remove a checksum if present
    trailer.removeItem(COSName.DOC_CHECKSUM);

    trailer.accept(this);
}

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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/* ww  w  . j a v a 2 s. c  o  m*/
 *
 * 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;
        }
    }
}

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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);
        }/*  ww w .  j av  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;
        }
    }
}

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