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https://issues.apache.org/jira/browse/PDFBOX-6178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18067575#comment-18067575
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Maruan Sahyoun commented on PDFBOX-6178:
----------------------------------------
the compareTo() implementation has a potential flaw compared to the 3.0
implementation. It's possible that two different byte[] end with the same
String representation. But you're right it's not worse than the current version
in 2.0. What about below code instead of the String comparison?
{code:java}
int len = Math.min(nameBytes.length, other.nameBytes.length);
for (int i = 0; i < len; i++)
{
int diff = (nameBytes[i] & 0xFF) - (other.nameBytes[i] & 0xFF);
if (diff != 0)
{
return diff;
}
}
return nameBytes.length - other.nameBytes.length;
{code}
> PdfBox renames RadioButton with Umlaut
> --------------------------------------
>
> Key: PDFBOX-6178
> URL: https://issues.apache.org/jira/browse/PDFBOX-6178
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.36, 3.0.5 PDFBox, 3.0.6 PDFBox, 3.0.7 PDFBox
> Reporter: Maruan Sahyoun
> Assignee: Maruan Sahyoun
> Priority: Major
> Fix For: 2.0.37, 3.0.8 PDFBox, 4.0.0
>
> Attachments: form_empty.pdf, form_selected_ASCII_NUL_acrobat.pdf,
> form_selected_acrobat_pro.pdf, form_selected_pdfbox.pdf
>
>
> From the users mailing list:
> 1. Create a document that contains a radio button with Umlaut in name. I can
> give you an example document.
> Let's say: A radio group "Geschlecht" with the buttons "männlich" and
> "weiblich".
> Do not use PdfBox for this step. I used Acrobat Pro 2020.
> The name/value of the "männlich" button is encoded as "/m#e4nnlich" in the
> PDF.
> 2. Update the value of the radio group with PdfBox to "männlich" and save it
> to a new document.
> {code}
> import java.io.File;
> import org.apache.pdfbox.Loader;
> import org.apache.pdfbox.pdmodel.PDDocument;
> public class UpdateRadioGroup {
> private static final String INPUT_FILE = "form_empty.pdf";
> private static final String OUTPUT_FILE = "form_selected.pdf";
> private static final String FIELD_NAME = "Geschlecht";
> private static final String FIELD_VALUE = "männlich";
> public static void main(String[] args) throws Exception {
> try (PDDocument document = Loader.loadPDF(new File(INPUT_FILE))) {
> document.getDocumentCatalog()
> .getAcroForm(null)
> .getField(FIELD_NAME)
> .setValue(FIELD_VALUE);
> document.save(new File(OUTPUT_FILE));
> }
> }
> }
> {code}
> 3. Validate the name/value of the "männlich" button in the new document in a
> text editor. PdfBox encodes "männlich" to "/m#c3#a4nnlich" (see
> COSName.writePDF() ).
> The Problem
> ===============
> PdfBox renames the radio button from "männlich" to "männlich". Or
> "/m#e4nnlich" to "/m#c3#a4nnlich" in PDF-format.
> When you read the document again, PdfBox converts "#c3#a" to "ä" but
> all other programs do not. I tested Acrobat Pro 2020, actual Acrobat
> Reader, PDFXplorer from https://www.o2sol.com
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