Hello,
First of all, thank you for this wonderful Swiss army knife for PDFs that is
PdfBox.
Java version : 21
Pdfbox version : 3.0.4
Description :
When a pdf is saved with option CompressParameters.NO_COMPRESSION, useless
lines like
nnnnnnnnnn 65535 f
are added to xref section
When splitting a pdf, this side effect seems cumulative when saving each part.
Not really relevant when saving only one pdf but when splitting a pdf to 5000
parts, it becomes huge.
You can reproduce the issue with any pdf
Current workaround to fix this issue : open and save the produced pdf(s) with
itextpdf 5.5.13.4 remove the useless lines like nnnnnnnnnn 65535 f
Regards,
Yannick
Test class :
import org.apache.pdfbox.Loader;
import org.apache.pdfbox.multipdf.Splitter;
import org.apache.pdfbox.pdfwriter.compress.CompressParameters;
import org.apache.pdfbox.pdmodel.PDDocument;
import java.io.File;
import java.util.List;
public class Test_NO_COMPRESSION {
public static void main(String[] args) {
if (args.length != 1) {
System.out.println("Test_NO_COMPRESSION usage : [absolute path of
the pdf to save and split]");
System.exit(-1);
}
try {
File pdf = new File(args[0]);
String targetPath = pdf.getAbsolutePath() + "." +
System.currentTimeMillis() + ".pdf";
try (PDDocument doc = Loader.loadPDF(pdf)) {
System.out.println("Saving NO_COMPRESSION to file " +
targetPath);
doc.save(targetPath, CompressParameters.NO_COMPRESSION);
}
try (PDDocument doc = Loader.loadPDF(pdf)) {
for (int i = 1; i < doc.getNumberOfPages(); i++) {
Splitter splitter = new Splitter();
splitter.setStartPage(i);
splitter.setEndPage(i + 1);
splitter.setSplitAtPage(i + 1);
List<PDDocument> documents = splitter.split(doc);
PDDocument tempDoc = documents.getFirst();
String splitFilePath = targetPath + ".part." + i + ".pdf";
System.out.println("Saving page #" + i + " NO_COMPRESSION
to file " + splitFilePath);
tempDoc.save(splitFilePath,
CompressParameters.NO_COMPRESSION);
tempDoc.close();
}
}
System.out.println("Done");
} catch (Exception e) {
e.printStackTrace();
}
}
}
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