From 46039355e87825a9dce12ebaad0305d20eea3f43 Mon Sep 17 00:00:00 2001
From: CGantert345 <57003061+CGantert345@users.noreply.github.com>
Date: Fri, 3 Jan 2020 10:37:01 +0100
Subject: basic asn.1 library

---
 src/net/gcdc/asn1/uper/BigIntCoder.java | 96 +++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/net/gcdc/asn1/uper/BigIntCoder.java

(limited to 'src/net/gcdc/asn1/uper/BigIntCoder.java')

diff --git a/src/net/gcdc/asn1/uper/BigIntCoder.java b/src/net/gcdc/asn1/uper/BigIntCoder.java
new file mode 100644
index 0000000..8c24eb7
--- /dev/null
+++ b/src/net/gcdc/asn1/uper/BigIntCoder.java
@@ -0,0 +1,96 @@
+package net.gcdc.asn1.uper;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Field;
+import java.math.BigInteger;
+import net.gcdc.asn1.datatypes.Asn1BigInteger;
+import net.gcdc.asn1.datatypes.Asn1Default;
+import net.gcdc.asn1.datatypes.IntRange;
+
+class BigIntCoder implements Encoder, Decoder {
+
+    @Override public <T> boolean canDecode(Class<T> classOfT, Annotation[] extraAnnotations) {
+        return Asn1BigInteger.class.isAssignableFrom(classOfT);
+    }
+
+    @Override public <T> T decode(BitBuffer bitbuffer,
+            Class<T> classOfT, Field f,
+            Annotation[] extraAnnotations) {
+        AnnotationStore annotations = new AnnotationStore(classOfT.getAnnotations(),
+                extraAnnotations);
+    	
+    	String pos = String.format("%d.%d", bitbuffer.position()/8 , bitbuffer.position() % 8);
+        UperEncoder.logger.debug(String.format("Position %s BIG INT",pos));
+        IntRange intRange = annotations.getAnnotation(IntRange.class);
+        if (intRange != null && intRange.maxValue() > 0) { 
+        	throw new UnsupportedOperationException("Big int with upper range is not supported yet"); 
+        }
+
+        int lengthInOctets = (int) UperEncoder.decodeLengthDeterminant(bitbuffer);
+        BitBuffer valueBits = ByteBitBuffer.allocate(lengthInOctets * 8);
+        for (int i = 0; i < lengthInOctets * 8; i++) {
+            valueBits.put(bitbuffer.get());
+        }
+        valueBits.flip();
+        BigInteger resultValue = new BigInteger(+1, valueBits.array());
+        UperEncoder.logger.debug(String.format("big int Decoded as %s", resultValue));
+        
+        
+        //CG support for int range
+        if (intRange != null){
+        	resultValue.add(BigInteger.valueOf(intRange.minValue()));
+        }
+        
+        
+        return UperEncoder.instantiate(classOfT, resultValue);
+    }
+
+    @Override public <T> boolean canEncode(T obj, Annotation[] extraAnnotations) {
+        return obj instanceof Asn1BigInteger;
+    }
+
+    @Override public <T> void encode(BitBuffer bitbuffer, T obj, Annotation[] extraAnnotations) throws Asn1EncodingException {
+        Class<?> type = obj.getClass();
+        AnnotationStore annotations = new AnnotationStore(type.getAnnotations(), extraAnnotations);
+        IntRange range = annotations.getAnnotation(IntRange.class);
+        
+        //CG implementation with lower range limit added
+        BigInteger bint = ((Asn1BigInteger) obj).toBigInteger();
+        if (range != null) { 
+       		throw new UnsupportedOperationException("Asn1 BigInteger with range is not supported"); 
+        }
+        byte[] array = bint.toByteArray();
+        int lengthInOctets = array.length;
+        int position1 = bitbuffer.position();
+        try {
+            UperEncoder.encodeLengthDeterminant(bitbuffer, lengthInOctets);
+        } catch (Asn1EncodingException e) {
+            throw new Asn1EncodingException(" length determinant of " + type.getName(), e);
+        }
+        int position2 = bitbuffer.position();
+        for (byte b : array) {
+            bitbuffer.putByte(b);
+        }
+        UperEncoder.logger.debug(String.format("Big Int(%s): len %s, val %s", obj,
+                 bitbuffer.toBooleanString(position1, position2 - position1),
+                 bitbuffer.toBooleanStringFromPosition(position2)));
+        return;
+    }
+
+	@Override
+	public <T> T getDefault(Class<T> classOfT, Annotation[] extraAnnotations) {
+			AnnotationStore annotations = new AnnotationStore(classOfT.getAnnotations(), extraAnnotations);
+	        Asn1Default defaultAnnotation = annotations.getAnnotation(Asn1Default.class);
+	        if (defaultAnnotation == null) return null;
+	        //check whether the class has a constructor for numeric types
+	        String valueString = defaultAnnotation.value();
+	        long value = Long.parseLong(valueString);
+	        UperEncoder.logger.debug(String.format("Default INTEGER: %d",value ));
+	        
+	        @SuppressWarnings("unchecked")
+			T t = (T) new Asn1BigInteger(value);
+			return t;
+
+	}
+
+}
\ No newline at end of file
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