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-rw-r--r--pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java48
1 files changed, 48 insertions, 0 deletions
diff --git a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
index 8b649034..2161c05a 100644
--- a/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
+++ b/pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java
@@ -1,6 +1,7 @@
package at.gv.egiz.pdfas.common.utils;
import java.util.ArrayList;
+import java.util.Arrays;
import java.util.List;
import org.apache.pdfbox.pdmodel.PDDocument;
@@ -8,6 +9,7 @@ import org.apache.pdfbox.pdmodel.encryption.AccessPermission;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
+import at.gv.egiz.pdfas.common.exceptions.PDFIOException;
import at.gv.egiz.pdfas.common.exceptions.PdfAsValidationException;
public class PDFUtils {
@@ -28,6 +30,52 @@ public class PDFUtils {
private static final byte range_seperation = (byte) 0x20;
private static final byte range_end = (byte) 0x5D;
+ public static int[] buildExcludeRange(int[] byteRange) throws PDFIOException {
+
+ if(byteRange.length % 2 != 0) {
+ throw new PDFIOException("error.pdf.io.09");
+ }
+
+ int[] exclude_range = new int[byteRange.length-2];
+
+ for(int i = 0; i < byteRange.length; i = i + 2) {
+ int offset = byteRange[i];
+ int size = byteRange[i+1];
+ if(i + 2 < byteRange.length) {
+ exclude_range[i] = offset + size; // exclude start
+ exclude_range[i+1] = byteRange[i+2] - 1; // exclude end
+ }
+ }
+ return exclude_range;
+ }
+
+ public static byte[] blackOutSignature(byte[] signatureData, int[] byteRange) throws PDFIOException {
+ if(byteRange.length % 2 != 0) {
+ throw new PDFIOException("error.pdf.io.09");
+ }
+
+ int lastOffset = byteRange[byteRange.length - 2];
+ int lastSize = byteRange[byteRange.length - 1];
+
+ int dataSize = lastOffset + lastSize;
+
+ byte[] data = new byte[dataSize];
+ int currentdataOff = 0;
+
+ Arrays.fill(data, (byte)0x0);
+
+ for(int i = 0; i < byteRange.length; i = i + 2) {
+ int offset = byteRange[i];
+ int size = byteRange[i+1];
+
+ for(int j = 0; j < size; j++) {
+ data[offset + j] = signatureData[currentdataOff];
+ currentdataOff++;
+ }
+ }
+ return data;
+ }
+
private static int extractASCIIInteger(byte[] data, int offset) {
int nextsepp = nextSeperator(data, offset);