| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| */ |
| package org.apache.kerby.xdr.type; |
| |
| import org.apache.kerby.xdr.XdrDataType; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Xdr Unsigned Integer type from RFC 4506 |
| * An XDR unsigned integer is a 32-bit datum that encodes |
| * a non-negative integer in the range [0,4294967295]. |
| * It is represented by an unsigned binary number whose most |
| * and least significant bytes are 0 and 3, respectively. |
| * An unsigned integer is declared as follows: |
| * unsigned int identifier; |
| * |
| * (MSB) (LSB) |
| * +-------+-------+-------+-------+ |
| * |byte 0 |byte 1 |byte 2 |byte 3 | |
| * +-------+-------+-------+-------+ |
| * <------------32 bits------------> |
| */ |
| public class XdrUnsignedInteger extends XdrSimple<Long> { |
| public XdrUnsignedInteger() { |
| this((Long) null); |
| } |
| |
| public XdrUnsignedInteger(String value) { |
| this(Long.valueOf(value)); |
| } |
| |
| public XdrUnsignedInteger(Long value) { |
| super(XdrDataType.UNSIGNED_INTEGER, value); |
| } |
| |
| /** |
| * The length of an unsigned integer is 4. |
| * @return Length of a unsigned integer type. |
| */ |
| @Override |
| protected int encodingBodyLength() { |
| return 4; /**Length of XdrInteger is fixed as 4 bytes*/ |
| } |
| |
| /** |
| * Encode Unsigned Integer type to bytes. |
| */ |
| @Override |
| protected void toBytes() throws IOException { |
| Long value = getValue(); |
| validateUnsignedInteger(value); /**Check whether the long value is valid unsigned int*/ |
| ByteBuffer buffer = ByteBuffer.allocate(8); |
| buffer.putLong(value); |
| byte[] bytes = new byte[4]; /**The encoding length is 4*/ |
| System.arraycopy(buffer.array(), 4, bytes, 0, 4); |
| setBytes(bytes); |
| } |
| |
| private void validateUnsignedInteger(Long value) throws IOException { |
| if (value < 0 || value > 4294967295L) { |
| throw new IOException("Invalid unsigned integer: " + value); |
| } |
| } |
| |
| /** |
| * Decode bytes to Unsigned Integer value. |
| */ |
| @Override |
| protected void toValue() { |
| if (getBytes().length != 4) { |
| byte[] bytes = ByteBuffer.allocate(4).put(getBytes(), 0, 4).array(); |
| setBytes(bytes); /**reset bytes in case the enum type is in a struct or union*/ |
| } |
| |
| byte[] longBytes = {(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, |
| (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00}; |
| System.arraycopy(getBytes(), 0, longBytes, 4, 4); |
| ByteBuffer buffer = ByteBuffer.wrap(longBytes); |
| setValue(buffer.getLong()); |
| } |
| } |