diff options
Diffstat (limited to 'pdf-as-common/src/main/java/at/gv/egiz/pdfas/common')
| -rw-r--r-- | pdf-as-common/src/main/java/at/gv/egiz/pdfas/common/utils/PDFUtils.java | 48 |
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); |