PdfCopyFieldsImp(OutputStream os) throws DocumentException 
{
    
        this(os, '\0");
}

 PdfCopyFieldsImp(OutputStream os,
    char pdfVersion) throws DocumentException 
{
        super(new PdfDocument(), os);
        pdf.addWriter(this);
        if (pdfVersion != 0)
            super.setPdfVersion(pdfVersion);
        nd = new Document();
        nd.addDocListener(pdf);
}

  void addDocument(PdfReader reader) throws DocumentException 
{
        if (!reader.isOpenedWithFullPermissions())
            throw new IllegalArgumentException("PdfReader not opened with owner password");
        openDoc();
        if (readers2intrefs.containsKey(reader)) {
            reader = new PdfReader(reader);
        }
        else {
            if (reader.isTampered())
                throw new DocumentException("The document was reused.");
            reader.consolidateNamedDestinations();
            reader.setTampered(true);
        }
        reader.shuffleSubsetNames();
        readers2intrefs.put(reader, new IntHashtable());
        readers.add(reader);
        int len = reader.getNumberOfPages();
        IntHashtable refs = new IntHashtable();
        for (int p = 1; p < = len; ++p) {
            refs.put(reader.getPageOrigRef(p).getNumber(), 1);
            reader.releasePage(p);
        }
        pages2intrefs.put(reader, refs);
        visited.put(reader, new IntHashtable());
        fields.add(reader.getAcroFields());
        updateCalculationOrder(reader);
}

  void addDocument(PdfReader reader,
    List pagesToKeep) throws DocumentException 
{
        if (!readers2intrefs.containsKey(reader) && reader.isTampered())
            throw new DocumentException("The document was reused.");
        reader = new PdfReader(reader);        
        reader.selectPages(pagesToKeep);
        if (reader.getNumberOfPages() == 0)
            return;
        reader.setTampered(false);
        addDocument(reader);
}

  void addPageOffsetToField(HashMap fd,
    int pageOffset) 
{
        if (pageOffset == 0)
            return;
        for (Iterator it = fd.values().iterator(); it.hasNext();) {
            ArrayList page = ((AcroFields.Item)it.next()).page;
            for (int k = 0; k <  page.size(); ++k)
                page.set(k, new Integer(((Integer)page.get(k)).intValue() + pageOffset));
        }
}

 protected PdfArray branchForm(HashMap level,
    PdfIndirectReference parent,
    String fname) throws IOException 
{
        PdfArray arr = new PdfArray();
        for (Iterator it = level.entrySet().iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry) it.next();
            String name = (String) entry.getKey();
            Object obj = entry.getValue();
            PdfIndirectReference ind = getPdfIndirectReference();
            PdfDictionary dic = new PdfDictionary();
            if (parent != null)
                dic.put(PdfName.PARENT, parent);
            dic.put(PdfName.T, new PdfString(name, PdfObject.TEXT_UNICODE));
            String fname2 = fname + "." + name;
            int coidx = calculationOrder.indexOf(fname2);
            if (coidx  >= 0)
                calculationOrderRefs.set(coidx, ind);
            if (obj instanceof HashMap) {
                dic.put(PdfName.KIDS, branchForm((HashMap)obj, ind, fname2));
                arr.add(ind);
                addToBody(dic, ind);
            }
            else {
                ArrayList list = (ArrayList)obj;
                dic.mergeDifferent((PdfDictionary)list.get(0));
                if (list.size() == 3) {
                    dic.mergeDifferent((PdfDictionary)list.get(2));
                    int page = ((Integer)list.get(1)).intValue();
                    PdfDictionary pageDic = (PdfDictionary)pageDics.get(page - 1);
                    PdfArray annots = (PdfArray)PdfReader.getPdfObject(pageDic.get(PdfName.ANNOTS));
                    if (annots == null) {
                        annots = new PdfArray();
                        pageDic.put(PdfName.ANNOTS, annots);
                    }
                    PdfNumber nn = (PdfNumber)dic.get(iTextTag);
                    dic.remove(iTextTag);
                    adjustTabOrder(annots, ind, nn);
                }
                else {
                    PdfArray kids = new PdfArray();
                    for (int k = 1; k <  list.size(); k += 2) {
                        int page = ((Integer)list.get(k)).intValue();
                        PdfDictionary pageDic = (PdfDictionary)pageDics.get(page - 1);
                        PdfArray annots = (PdfArray)PdfReader.getPdfObject(pageDic.get(PdfName.ANNOTS));
                        if (annots == null) {
                            annots = new PdfArray();
                            pageDic.put(PdfName.ANNOTS, annots);
                        }
                        PdfDictionary widget = new PdfDictionary();
                        widget.merge((PdfDictionary)list.get(k + 1));
                        widget.put(PdfName.PARENT, ind);
                        PdfNumber nn = (PdfNumber)widget.get(iTextTag);
                        widget.remove(iTextTag);
                        PdfIndirectReference wref = addToBody(widget).getIndirectReference();
                        adjustTabOrder(annots, wref, nn);
                        kids.add(wref);
                        propagate(widget, null, false);
                    }
                    dic.put(PdfName.KIDS, kids);
                }
                arr.add(ind);
                addToBody(dic, ind);
                propagate(dic, null, false);
            }
        }
        return arr;
}

 public  void close() 
{
        if (closing) {
            super.close();
            return;
        }
        closing = true;
        try {
            closeIt();
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
}

 protected  void closeIt() throws IOException 
{
        for (int k = 0; k <  readers.size(); ++k) {
            ((PdfReader)readers.get(k)).removeFields();
        }
        for (int r = 0; r <  readers.size(); ++r) {
            PdfReader reader = (PdfReader)readers.get(r);
            for (int page = 1; page < = reader.getNumberOfPages(); ++page) {
                pageRefs.add(getNewReference(reader.getPageOrigRef(page)));
                pageDics.add(reader.getPageN(page));
            }
        }
        mergeFields();
        createAcroForms();
        for (int r = 0; r <  readers.size(); ++r) {
                PdfReader reader = (PdfReader)readers.get(r);
                for (int page = 1; page < = reader.getNumberOfPages(); ++page) {
                    PdfDictionary dic = reader.getPageN(page);
                    PdfIndirectReference pageRef = getNewReference(reader.getPageOrigRef(page));
                    PdfIndirectReference parent = root.addPageRef(pageRef);
                    dic.put(PdfName.PARENT, parent);
                    propagate(dic, pageRef, false);
                }
        }
        for (Iterator it = readers2intrefs.entrySet().iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry) it.next();
            PdfReader reader = (PdfReader) entry.getKey();
            try {
                file = reader.getSafeFile();
                file.reOpen();
                IntHashtable t = (IntHashtable) entry.getValue();
                int keys[] = t.toOrderedKeys();
                for (int k = 0; k <  keys.length; ++k) {
                    PRIndirectReference ref = new PRIndirectReference(reader, keys[k]);
                    addToBody(PdfReader.getPdfObjectRelease(ref), t.get(keys[k]));
                }
            }
            finally {
                try {
                    file.close();
                    reader.close();
                }
                catch (Exception e) {
                    // empty on purpose
                }
            }
        }
        pdf.close();
}

 protected  void createAcroForms() throws IOException 
{
        if (fieldTree.isEmpty())
            return;
        form = new PdfDictionary();
        form.put(PdfName.DR, resources);
        propagate(resources, null, false);
        form.put(PdfName.DA, new PdfString("/Helv 0 Tf 0 g "));
        tabOrder = new HashMap();
        calculationOrderRefs = new ArrayList(calculationOrder);
        form.put(PdfName.FIELDS, branchForm(fieldTree, null, ""));
        PdfArray co = new PdfArray();
        for (int k = 0; k <  calculationOrderRefs.size(); ++k) {
            Object obj = calculationOrderRefs.get(k);
            if (obj instanceof PdfIndirectReference)
                co.add((PdfIndirectReference)obj);
        }
        if (co.size()  > 0)
            form.put(PdfName.CO, co);
}

  void createWidgets(ArrayList list,
    AcroFields.Item item) 
{
        for (int k = 0; k <  item.merged.size(); ++k) {
            list.add(item.page.get(k));
            PdfDictionary merged = (PdfDictionary)item.merged.get(k);
            PdfObject dr = merged.get(PdfName.DR);
            if (dr != null)
                PdfFormField.mergeResources(resources, (PdfDictionary)PdfReader.getPdfObject(dr));
            PdfDictionary widget = new PdfDictionary();
            for (Iterator it = merged.getKeys().iterator(); it.hasNext();) {
                PdfName key = (PdfName)it.next();
                if (widgetKeys.containsKey(key))
                    widget.put(key, merged.get(key));
            }
            widget.put(iTextTag, new PdfNumber(((Integer)item.tabOrder.get(k)).intValue() + 1));
            list.add(widget);
        }
}

 protected PdfDictionary getCatalog(PdfIndirectReference rootObj) 
{
        try {
            PdfDictionary cat = pdf.getCatalog(rootObj);
            if (form != null) {
                PdfIndirectReference ref = addToBody(form).getIndirectReference();
                cat.put(PdfName.ACROFORM, ref);
            }
            writeOutlines(cat, false);
            return cat;
        }
        catch (IOException e) {
            throw new ExceptionConverter(e);
        }
}

 protected int getNewObjectNumber(PdfReader reader,
    int number,
    int generation) 
{
        IntHashtable refs = (IntHashtable)readers2intrefs.get(reader);
        int n = refs.get(number);
        if (n == 0) {
            n = getIndirectReferenceNumber();
            refs.put(number, n);
        }
        return n;
}

 protected PdfIndirectReference getNewReference(PRIndirectReference ref) 
{
        return new PdfIndirectReference(0, getNewObjectNumber(ref.getReader(), ref.getNumber(), 0));
}

 public PdfIndirectReference getPageReference(int page) 
{
        return (PdfIndirectReference)pageRefs.get(page - 1);
}

 RandomAccessFileOrArray getReaderFile(PdfReader reader) 
{
            return file;
}

 protected boolean isPage(PRIndirectReference ref) 
{
        IntHashtable refs = (IntHashtable)pages2intrefs.get(ref.getReader());
        return refs.containsKey(ref.getNumber());
}

 protected boolean isVisited(PRIndirectReference ref) 
{
        IntHashtable refs = (IntHashtable)visited.get(ref.getReader());
        return refs.containsKey(ref.getNumber());
}

 protected boolean isVisited(PdfReader reader,
    int number,
    int generation) 
{
        IntHashtable refs = (IntHashtable)readers2intrefs.get(reader);
        return refs.containsKey(number);
}

  void mergeField(String name,
    AcroFields.Item item) 
{
        HashMap map = fieldTree;
        StringTokenizer tk = new StringTokenizer(name, ".");
        if (!tk.hasMoreTokens())
            return;
        while (true) {
            String s = tk.nextToken();
            Object obj = map.get(s);
            if (tk.hasMoreTokens()) {
                if (obj == null) {
                    obj = new HashMap();
                    map.put(s, obj);
                    map = (HashMap)obj;
                    continue;
                }
                else if (obj instanceof HashMap)
                    map = (HashMap)obj;
                else
                    return;
            }
            else {
                if (obj instanceof HashMap)
                    return;
                PdfDictionary merged = (PdfDictionary)item.merged.get(0);
                if (obj == null) {
                    PdfDictionary field = new PdfDictionary();
                    for (Iterator it = merged.getKeys().iterator(); it.hasNext();) {
                        PdfName key = (PdfName)it.next();
                        if (fieldKeys.containsKey(key))
                            field.put(key, merged.get(key));
                    }
                    ArrayList list = new ArrayList();
                    list.add(field);
                    createWidgets(list, item);
                    map.put(s, list);
                }
                else {
                    ArrayList list = (ArrayList)obj;
                    PdfDictionary field = (PdfDictionary)list.get(0);
                    PdfName type1 = (PdfName)field.get(PdfName.FT);
                    PdfName type2 = (PdfName)merged.get(PdfName.FT);
                    if (type1 == null || !type1.equals(type2))
                        return;
                    int flag1 = 0;
                    PdfObject f1 = field.get(PdfName.FF);
                    if (f1 != null && f1.isNumber())
                        flag1 = ((PdfNumber)f1).intValue();
                    int flag2 = 0;
                    PdfObject f2 = merged.get(PdfName.FF);
                    if (f2 != null && f2.isNumber())
                        flag2 = ((PdfNumber)f2).intValue();
                    if (type1.equals(PdfName.BTN)) {
                        if (((flag1 ^ flag2) & PdfFormField.FF_PUSHBUTTON) != 0)
                            return;
                        if ((flag1 & PdfFormField.FF_PUSHBUTTON) == 0 && ((flag1 ^ flag2) & PdfFormField.FF_RADIO) != 0)
                            return;
                    }
                    else if (type1.equals(PdfName.CH)) {
                        if (((flag1 ^ flag2) & PdfFormField.FF_COMBO) != 0)
                            return;
                    }
                    createWidgets(list, item);
                }
                return;
            }
        }
}

  void mergeFields() 
{
        int pageOffset = 0;
        for (int k = 0; k <  fields.size(); ++k) {
            HashMap fd = ((AcroFields)fields.get(k)).getFields();
            addPageOffsetToField(fd, pageOffset);
            mergeWithMaster(fd);
            pageOffset += ((PdfReader)readers.get(k)).getNumberOfPages();
        }
}

  void mergeWithMaster(HashMap fd) 
{
        for (Iterator it = fd.entrySet().iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry) it.next();
            String name = (String) entry.getKey();
            mergeField(name, (AcroFields.Item) entry.getValue());
        }
}

 public  void openDoc() 
{
        if (!nd.isOpen())
            nd.open();
}

  void propagate(PdfObject obj,
    PdfIndirectReference refo,
    boolean restricted) throws IOException 
{
        if (obj == null)
            return;
//        if (refo != null)
//            addToBody(obj, refo);
        if (obj instanceof PdfIndirectReference)
            return;
        switch (obj.type()) {
            case PdfObject.DICTIONARY:
            case PdfObject.STREAM: {
                PdfDictionary dic = (PdfDictionary)obj;
                for (Iterator it = dic.getKeys().iterator(); it.hasNext();) {
                    PdfName key = (PdfName)it.next();
                    if (restricted && (key.equals(PdfName.PARENT) || key.equals(PdfName.KIDS)))
                        continue;
                    PdfObject ob = dic.get(key);
                    if (ob != null && ob.isIndirect()) {
                        PRIndirectReference ind = (PRIndirectReference)ob;
                        if (!setVisited(ind) && !isPage(ind)) {
                            PdfIndirectReference ref = getNewReference(ind);
                            propagate(PdfReader.getPdfObjectRelease(ind), ref, restricted);
                        }
                    }
                    else
                        propagate(ob, null, restricted);
                }
                break;
            }
            case PdfObject.ARRAY: {
                ArrayList list = ((PdfArray)obj).getArrayList();
                //PdfArray arr = new PdfArray();
                for (Iterator it = list.iterator(); it.hasNext();) {
                    PdfObject ob = (PdfObject)it.next();
                    if (ob != null && ob.isIndirect()) {
                        PRIndirectReference ind = (PRIndirectReference)ob;
                        if (!isVisited(ind) && !isPage(ind)) {
                            PdfIndirectReference ref = getNewReference(ind);
                            propagate(PdfReader.getPdfObjectRelease(ind), ref, restricted);
                        }
                    }
                    else
                        propagate(ob, null, restricted);
                }
                break;
            }
            case PdfObject.INDIRECT: {
                throw new RuntimeException("Reference pointing to reference.");
            }
        }
}

 protected boolean setVisited(PRIndirectReference ref) 
{
        IntHashtable refs = (IntHashtable)visited.get(ref.getReader());
        return (refs.put(ref.getNumber(), 1) != 0);
}