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/*
*
* 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.qpid.management.messages;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
/**
* AMQP Management messages codec.
*
* @author Andrea Gazzarini
*/
public class AmqpCoDec
{
private byte [] _buffer;
private int _position;
/**
* Builds a new codec.
*/
AmqpCoDec()
{
_buffer = new byte [1000];
_buffer[0] = 'A';
_buffer[1] = 'M';
_buffer[2] = '2';
_position = 3;
}
/**
* Int32-to-4 byte array marshalling.
* Marshalles an integer using four bytes.
*
* @param data the result array.
* @param pos the starting position of the array to be filled.
* @param value the value to be marshalled.
*/
public final void pack32(int value) {
_buffer[_position++] = (byte) (value >> 24 & 0xff);
_buffer[_position++] = (byte) (value >> 16 & 0xff);
_buffer[_position++] = (byte) (value >> 8 & 0xff);
_buffer[_position++] = (byte) (value & 0xff);
}
/**
* Int32-to-4 byte array marshalling.
* Marshalles an integer using four bytes.
*
* @param data the result array.
* @param pos the starting position of the array to be filled.
* @param value the value to be marshalled.
*/
public final void pack16(int value) {
_buffer[_position++] = (byte) (value >> 8 & 0xff);
_buffer[_position++] = (byte) (value & 0xff);
}
/**
* Int32-to-4 byte array marshalling.
* Marshalles an integer using four bytes.
*
* @param data the result array.
* @param pos the starting position of the array to be filled.
* @param value the value to be marshalled.
*/
public final void pack64(long value) {
_buffer[_position++] = (byte) (value >> 56 & 0xff);
_buffer[_position++] = (byte) (value >> 48 & 0xff);
_buffer[_position++] = (byte) (value >> 40 & 0xff);
_buffer[_position++] = (byte) (value >> 32 & 0xff);
_buffer[_position++] = (byte) (value >> 24 & 0xff);
_buffer[_position++] = (byte) (value >> 16 & 0xff);
_buffer[_position++] = (byte) (value >> 8 & 0xff);
_buffer[_position++] = (byte) (value & 0xff);
}
/**
* Int32-to-byte array marshalling.
* Marshalles an integer using two bytes.
*
* @param data the result array.
* @param pos the starting position of the array to be filled.
* @param value the value to be marshalled.
*/
public final void pack24(int value) {
_buffer[_position++] = (byte) (value >> 16 & 0xff);
_buffer[_position++] = (byte) (value >> 8 & 0xff);
_buffer[_position++] = (byte) (value & 0xff);
}
public final void pack8(int value) {
_buffer[_position++] = (byte) (value & 0xff);
}
public void pack8 (byte aByte)
{
_buffer[_position++] = aByte;
}
public void packStr8(String aString)
{
try
{
byte [] toBytes = aString.getBytes("UTF-8");
int length = toBytes.length;
pack8(length);
System.arraycopy(toBytes, 0, _buffer, _position, length);
_position+=length;
} catch (UnsupportedEncodingException exception)
{
throw new RuntimeException(exception);
}
}
public void packStr16(String aString)
{
try
{
byte [] toBytes = aString.getBytes("UTF-8");
int length = toBytes.length;
pack16(length);
System.arraycopy(toBytes, 0, _buffer, _position, length);
_position+=length;
} catch (UnsupportedEncodingException exception)
{
throw new RuntimeException(exception);
}
}
public static final long unpack64(byte data[]) {
return (
((long) (data[0] & 0xff) << 56) |
((long)(data[1] & 0xff) << 48) |
((long)(data[2] & 0xff) << 40) |
((long)(data[3] & 0xff) << 32) |
((long)(data[4] & 0xff) << 24) |
((long)(data[5] & 0xff) << 16) |
((long)(data[6] & 0xff) << 8) |
(long) data[7] & 0xff);
}
public void pack (byte[] bytes)
{
System.arraycopy(bytes, 0, _buffer, _position, bytes.length);
_position+=bytes.length;
}
/**
* Retruns the byte buffer that is wrapping the backing array of this codec.
*
* @return the byte buffer that is wrapping the backing array of this codec.
*/
public ByteBuffer getEncodedBuffer ()
{
return ByteBuffer.wrap(_buffer,0,_position);
}
}
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