From 09f0f9449a10b713207126348105fafec4781bed Mon Sep 17 00:00:00 2001
From: CGantert345 <57003061+CGantert345@users.noreply.github.com>
Date: Mon, 24 Jan 2022 16:51:04 +0100
Subject: signature validation changed to work with teh dynamic header version
 2.

---
 .../org/uic/barcode/asn1/uper/AsnExtractor.java    | 80 ++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/main/java/org/uic/barcode/asn1/uper/AsnExtractor.java

(limited to 'src/main/java/org/uic/barcode/asn1/uper/AsnExtractor.java')

diff --git a/src/main/java/org/uic/barcode/asn1/uper/AsnExtractor.java b/src/main/java/org/uic/barcode/asn1/uper/AsnExtractor.java
new file mode 100644
index 0000000..0d5d1da
--- /dev/null
+++ b/src/main/java/org/uic/barcode/asn1/uper/AsnExtractor.java
@@ -0,0 +1,80 @@
+package org.uic.barcode.asn1.uper;
+
+public class AsnExtractor {
+	
+	private String path = null;
+	
+	private boolean extractionStarted = false;
+	private boolean extractionCompleted = false;
+	
+	private BitBuffer bitBuffer = null;
+	private int startBit = 0;
+	private int endBit = 0;
+	
+	AsnExtractor(String path, BitBuffer bitBuffer) {
+		this.path = path;
+		this.bitBuffer = bitBuffer;
+	}
+
+	public byte[] getResult() {
+		
+		if (!extractionCompleted) {
+			return null;
+		}
+		
+		if (!(endBit > startBit)) {
+			return null;
+		}
+		
+		String bitString = bitBuffer.toBooleanString(startBit, endBit - startBit);
+		
+		while (bitString.length() % 8 != 0) {
+			bitString = bitString + "0";
+		}
+		
+		return AsnUtils.fromBooleanString(bitString);
+		
+	}
+	
+
+	
+	public boolean found(String className) {
+		
+		if (extractionStarted || extractionCompleted) return false;
+		
+		if (path != null && path.length() > 0 && className != null & className.length() > 0) {
+			if (className.endsWith(path)){
+				return true;
+			}
+		}
+		
+		return false;
+	}
+	
+	public void startExtraction(int position) {
+		
+		if (path == null || path.length() == 0 || bitBuffer == null) {
+			return;
+		}
+		
+		if (!extractionCompleted && !extractionStarted) {
+			extractionStarted = true;
+			startBit = position;
+		}
+	}
+	
+	public void endExtraction(int position) {
+		if (extractionStarted) {
+			extractionCompleted = true;
+			endBit = position;
+		}
+
+	}
+
+	public boolean isStarted() {
+		return extractionStarted;
+	}
+	
+	
+	
+}
-- 
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