1 files changed, 58 insertions, 0 deletions
diff --git a/src/org/uic/barcode/asn1/datatypes/Asn1VarSizeBitstring.java b/src/org/uic/barcode/asn1/datatypes/Asn1VarSizeBitstring.java
new file mode 100644
index 0000000..c07f7f0
--- /dev/null
+++ b/src/org/uic/barcode/asn1/datatypes/Asn1VarSizeBitstring.java
@@ -0,0 +1,58 @@
+package org.uic.barcode.asn1.datatypes;
+
+import java.util.AbstractList;
+import java.util.BitSet;
+import java.util.Collection;
+import java.util.Objects;
+
+/**
+ * Convenience class for Bitstrings of variable size.
+ * For UPER, {@code List<Boolean>} works just as well.
+ */
+public class Asn1VarSizeBitstring extends AbstractList<Boolean> {
+
+    private final BitSet backing;
+
+    @Override public Boolean get(int index) {
+        return backing.get(index);
+    }
+
+    @Override public int size() {
+        return backing.length();
+    }
+
+    public Asn1VarSizeBitstring(Collection<Boolean> coll) {
+        backing = new BitSet();
+        int bitIndex = 0;
+        for (Boolean b : coll) {
+            backing.set(bitIndex, b);
+            bitIndex++;
+        }
+    }
+
+    public Asn1VarSizeBitstring(BitSet bitset) {
+        backing = (BitSet) bitset.clone();
+    }
+
+    protected void setBit(int bitIndex, boolean value) {
+        backing.set(bitIndex, value);
+    }
+
+    public boolean getBit(int bitIndex) {
+        return backing.get(bitIndex);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        if (!super.equals(o)) return false;
+        Asn1VarSizeBitstring booleen = (Asn1VarSizeBitstring) o;
+        return Objects.equals(backing, booleen.backing);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(super.hashCode(), backing);
+    }
+}