Fixed unique Signature field names, to make Adobe Reader happy

1 files changed, 29 insertions, 0 deletions

diff --git a/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java
new file mode 100644
index 00000000..28713e1a
--- /dev/null
+++ b/pdf-as-lib/src/main/java/at/gv/egiz/pdfas/lib/util/SignatureUtils.java
@@ -0,0 +1,29 @@
+package at.gv.egiz.pdfas.lib.util;
+
+import org.apache.pdfbox.cos.COSArray;
+import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSName;
+import org.apache.pdfbox.pdmodel.PDDocument;
+
+public class SignatureUtils {
+
+	public static int countSignatures(PDDocument doc) {
+		int count = 0;
+		COSDictionary trailer = doc.getDocument().getTrailer();
+		COSDictionary root = (COSDictionary) trailer
+				.getDictionaryObject(COSName.ROOT);
+		COSDictionary acroForm = (COSDictionary) root
+				.getDictionaryObject(COSName.ACRO_FORM);
+		COSArray fields = (COSArray) acroForm
+				.getDictionaryObject(COSName.FIELDS);
+		for (int i = 0; i < fields.size(); i++) {
+			COSDictionary field = (COSDictionary) fields.getObject(i);
+			String type = field.getNameAsString("FT");
+			if ("Sig".equals(type)) {
+				count++;
+			}
+		}
+		
+		return count;
+	}
+}