Splitting a PDF file

JAVA

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.merge;

import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.utils.PageRange;
import com.itextpdf.kernel.utils.PdfSplitter;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;

public class MergeAndCount {
    public static final String DEST = "./target/sandbox/merge/splitDocument1_%s.pdf";

    public static final String RESOURCE = "./src/main/resources/pdfs/Wrong.pdf";

    public static void main(String[] args) throws IOException {
        File file = new File(DEST);
        file.getParentFile().mkdirs();

        new MergeAndCount().manipulatePdf(DEST);
    }

    protected void manipulatePdf(final String dest) throws IOException {
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(RESOURCE));

        List<PdfDocument> splitDocuments = new PdfSplitter(pdfDoc) {
            int partNumber = 1;

            @Override
            protected PdfWriter getNextPdfWriter(PageRange documentPageRange) {
                try {
                    return new PdfWriter(String.format(dest, partNumber++));
                } catch (FileNotFoundException e) {
                    throw new RuntimeException(e);
                }
            }
        }.splitBySize(200000);

        for (PdfDocument doc : splitDocuments) {
            doc.close();
        }

        pdfDoc.close();
    }
}

C#

using System;
using System.Collections.Generic;
using System.IO;
using iText.Kernel.Pdf;
using iText.Kernel.Utils;

namespace iText.Samples.Sandbox.Merge
{
    public class MergeAndCount
    {
        public static readonly String DEST = "results/sandbox/merge/splitDocument1_{0}.pdf";

        public static readonly String RESOURCE = "../../../resources/pdfs/Wrong.pdf";

        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new MergeAndCount().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfReader(RESOURCE));

            IList<PdfDocument> splitDocuments = new CustomPdfSplitter(pdfDoc, dest).SplitBySize(200000);

            foreach (PdfDocument doc in splitDocuments)
            {
                doc.Close();
            }

            pdfDoc.Close();
        }
        
        private class CustomPdfSplitter : PdfSplitter
        {
            private String dest;
            private int partNumber = 1;
            
            public CustomPdfSplitter(PdfDocument pdfDocument, String dest) : base(pdfDocument)
            {
                this.dest = dest;
            }
            
            protected override PdfWriter GetNextPdfWriter(PageRange documentPageRange) {
                return new PdfWriter(String.Format(dest, partNumber++));
            }
        }
    }
}