diff options
Diffstat (limited to 'src/net/gcdc/asn1/uper/BigIntCoder.java')
| -rw-r--r-- | src/net/gcdc/asn1/uper/BigIntCoder.java | 96 |
1 files changed, 96 insertions, 0 deletions
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; + + } + +}
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