001 /*
002 GRANITE DATA SERVICES
003 Copyright (C) 2013 GRANITE DATA SERVICES S.A.S.
004
005 This file is part of Granite Data Services.
006
007 Granite Data Services is free software; you can redistribute it and/or modify
008 it under the terms of the GNU Library General Public License as published by
009 the Free Software Foundation; either version 2 of the License, or (at your
010 option) any later version.
011
012 Granite Data Services is distributed in the hope that it will be useful, but
013 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
014 FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
015 for more details.
016
017 You should have received a copy of the GNU Library General Public License
018 along with this library; if not, see <http://www.gnu.org/licenses/>.
019 */
020
021 package org.granite.messaging.jmf.codec.std.impl;
022
023 import java.io.IOException;
024 import java.io.OutputStream;
025 import java.math.BigInteger;
026
027 import org.granite.messaging.jmf.DumpContext;
028 import org.granite.messaging.jmf.InputContext;
029 import org.granite.messaging.jmf.OutputContext;
030 import org.granite.messaging.jmf.codec.std.BigIntegerCodec;
031
032 /**
033 * @author Franck WOLFF
034 */
035 public class BigIntegerCodecImpl extends AbstractIntegerStringCodec<BigInteger> implements BigIntegerCodec {
036
037 public int getObjectType() {
038 return JMF_BIG_INTEGER;
039 }
040
041 public Class<?> getObjectClass() {
042 return BigInteger.class;
043 }
044
045 public void encode(OutputContext ctx, BigInteger v) throws IOException {
046 final OutputStream os = ctx.getOutputStream();
047
048 int indexOfStoredObject = ctx.indexOfStoredObjects(v);
049 if (indexOfStoredObject >= 0) {
050 IntegerComponents ics = intComponents(indexOfStoredObject);
051 os.write(0x80 | (ics.length << 5) | JMF_BIG_INTEGER);
052 writeIntData(ctx, ics);
053 }
054 else {
055 ctx.addToStoredObjects(v);
056
057 byte[] magnitude = v.toByteArray();
058
059 IntegerComponents ics = intComponents(magnitude.length);
060 os.write((ics.length << 5) | JMF_BIG_INTEGER);
061 writeIntData(ctx, ics);
062
063 os.write(magnitude);
064 }
065 }
066
067 public BigInteger decode(InputContext ctx, int parameterizedJmfType) throws IOException {
068 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
069
070 if (jmfType != JMF_BIG_INTEGER)
071 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
072
073 int indexOrLength = readIntData(ctx, (parameterizedJmfType >> 5) & 0x03, false);
074 if ((parameterizedJmfType & 0x80) != 0)
075 return (BigInteger)ctx.getSharedObject(indexOrLength);
076
077 byte[] magnitude = new byte[indexOrLength];
078 ctx.safeReadFully(magnitude);
079 BigInteger v = new BigInteger(magnitude);
080
081 if (BigInteger.ZERO.equals(v))
082 v = BigInteger.ZERO;
083 else if (BigInteger.ONE.equals(v))
084 v = BigInteger.ONE;
085 else if (BigInteger.TEN.equals(v))
086 v = BigInteger.TEN;
087
088 return v;
089 }
090
091 public void dump(DumpContext ctx, int parameterizedJmfType) throws IOException {
092 int jmfType = ctx.getSharedContext().getCodecRegistry().extractJmfType(parameterizedJmfType);
093 if (jmfType != JMF_BIG_INTEGER)
094 throw newBadTypeJMFEncodingException(jmfType, parameterizedJmfType);
095 ctx.indentPrintLn(BigInteger.class.getName() + ": " + decode(ctx, parameterizedJmfType));
096 }
097 }