Apache POI fails to save (HWPFDocument.write) large word doc files

[Mohsen <mo...@gmail.com>]

I want to remove word metadata from .doc files. My .docx files works fine
with XWPFDocument, but the following code for removing metadata fails for
large (> 1MB) files. For example using a 6MB .doc file with images, it
outputs a 4.5MB file in which some images are removed.

public static InputStream removeMetaData(InputStream inputStream) throws
IOException {
    POIFSFileSystem fss = new POIFSFileSystem(inputStream);
    HWPFDocument doc = new HWPFDocument(fss);

    // if even fails on large files if you remove from here to 'until' below
    SummaryInformation si = doc.getSummaryInformation();
    si.removeAuthor();
    si.removeComments();
    si.removeLastAuthor();
    si.removeKeywords();
    si.removeSubject();
    si.removeTitle();

    doc.getDocumentSummaryInformation().removeCategory();
    doc.getDocumentSummaryInformation().removeCompany();
    doc.getDocumentSummaryInformation().removeManager();
    try {
        doc.getDocumentSummaryInformation().removeCustomProperties();
    } catch (Exception e) {
        // can not remove above
    }
    // until

    ByteArrayOutputStream os = new ByteArrayOutputStream();
    doc.write(os);
    os.flush();
    os.close();
    return new ByteArrayInputStream(os.toByteArray());
}




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