/**
* Extracts document level attachments
*
* @param filename a file from which document level attachments will be extracted
* @throws IOException
*/
public void extractDocLevelAttachments(String filename) throws IOException {
PdfReader reader = new PdfReader(filename);
PdfDictionary root = reader.getCatalog();
PdfDictionary documentnames = root.getAsDict(PdfName.NAMES);
PdfDictionary embeddedfiles = documentnames.getAsDict(PdfName.EMBEDDEDFILES);
PdfArray filespecs = embeddedfiles.getAsArray(PdfName.NAMES);
PdfDictionary filespec;
PdfDictionary refs;
FileOutputStream fos;
PRStream stream;
for (int i = 0; i < filespecs.size(); ) {
filespecs.getAsString(i++);
filespec = filespecs.getAsDict(i++);
refs = filespec.getAsDict(PdfName.EF);
for (PdfName key : refs.getKeys()) {
fos = new FileOutputStream(String.format(PATH, filespec.getAsString(key).toString()));
stream = (PRStream) PdfReader.getPdfObject(refs.getAsIndirectObject(key));
fos.write(PdfReader.getStreamBytes(stream));
fos.flush();
fos.close();
}
}
reader.close();
}
private static String getCOName(PdfReader reader, PRIndirectReference ref) {
String name = "";
while (ref != null) {
PdfObject obj = PdfReader.getPdfObject(ref);
if (obj == null || obj.type() != PdfObject.DICTIONARY) break;
PdfDictionary dic = (PdfDictionary) obj;
PdfString t = dic.getAsString(PdfName.T);
if (t != null) {
name = t.toUnicodeString() + "." + name;
}
ref = (PRIndirectReference) dic.get(PdfName.PARENT);
}
if (name.endsWith(".")) name = name.substring(0, name.length() - 1);
return name;
}
