/**
* Unpacks a file attachment.
*
* @param reader The object that reads the PDF document
* @param filespec The dictonary containing the file specifications
* @throws IOException
*/
protected static Object[] unpackFile(PdfReader reader, PdfDictionary filespec)
throws IOException {
Object arr[] = new Object[2]; // use to store name and file bytes
if (filespec == null) {
return null;
}
PdfName type = (PdfName) PdfReader.getPdfObject(filespec.get(PdfName.TYPE));
if (!PdfName.F.equals(type) && !PdfName.FILESPEC.equals(type)) {
return null;
}
PdfDictionary ef = (PdfDictionary) PdfReader.getPdfObject(filespec.get(PdfName.EF));
if (ef == null) {
return null;
}
PdfString fn = (PdfString) PdfReader.getPdfObject(filespec.get(PdfName.F));
if (fn == null) {
return null;
}
File fLast = new File(fn.toUnicodeString());
PRStream prs = (PRStream) PdfReader.getPdfObject(ef.get(PdfName.F));
if (prs == null) {
return null;
}
byte attachmentByte[] = PdfReader.getStreamBytes(prs);
arr[0] = fLast.getName();
arr[1] = attachmentByte;
return arr;
}
/**
* Unpacks a file attachment.
*
* @param reader The object that reads the PDF document
* @param filespec The dictionary containing the file specifications
* @param outPath The path where the attachment has to be written
* @throws IOException
*/
private static byte[] unpackFile(PdfReader reader, PdfDictionary filespec, String suffix)
throws IOException {
if (filespec == null) {
return null;
}
PdfName type = (PdfName) PdfReader.getPdfObject(filespec.get(PdfName.TYPE));
if (!PdfName.F.equals(type) && !PdfName.FILESPEC.equals(type)) {
return null;
}
PdfDictionary ef = (PdfDictionary) PdfReader.getPdfObject(filespec.get(PdfName.EF));
if (ef == null) {
return null;
}
PdfString fn = (PdfString) PdfReader.getPdfObject(filespec.get(PdfName.F));
if (fn == null) {
return null;
}
File fLast = new File(fn.toUnicodeString());
String filename = fLast.getName();
if (!filename.endsWith(suffix)) {
return null;
}
PRStream prs = (PRStream) PdfReader.getPdfObject(ef.get(PdfName.F));
if (prs == null) {
return null;
}
return PdfReader.getStreamBytes(prs);
}
/**
* Unpacks a file attachment.
*
* @param reader The object that reads the PDF document
* @param filespec The dictionary containing the file specifications
* @param outPath The path where the attachment has to be written
* @throws IOException
*/
public static void unpackFile(PdfReader reader, PdfDictionary filespec, String outPath)
throws IOException {
if (filespec == null) return;
PdfName type = filespec.getAsName(PdfName.TYPE);
if (!PdfName.F.equals(type) && !PdfName.FILESPEC.equals(type)) return;
PdfDictionary ef = filespec.getAsDict(PdfName.EF);
if (ef == null) return;
PdfString fn = filespec.getAsString(PdfName.F);
System.out.println("Unpacking file '" + fn + "' to " + outPath);
if (fn == null) return;
File fLast = new File(fn.toUnicodeString());
File fullPath = new File(outPath, fLast.getName());
if (fullPath.exists()) return;
PRStream prs = (PRStream) PdfReader.getPdfObject(ef.get(PdfName.F));
if (prs == null) return;
byte b[] = PdfReader.getStreamBytes(prs);
FileOutputStream fout = new FileOutputStream(fullPath);
fout.write(b);
fout.close();
}
