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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//
// Copyright (c) 2013-2020 VMware, Inc. or its affiliates. All rights reserved.
package com.rabbitmq.jms.client.message;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import javax.jms.BytesMessage;
import javax.jms.JMSException;
import javax.jms.MessageEOFException;
import javax.jms.MessageFormatException;
import javax.jms.MessageNotReadableException;
import javax.jms.MessageNotWriteableException;
import com.rabbitmq.jms.client.RMQMessage;
import com.rabbitmq.jms.util.RMQByteArrayOutputStream;
import com.rabbitmq.jms.util.RMQJMSException;
import com.rabbitmq.jms.util.RMQMessageFormatException;
/**
* Implementation of {@link BytesMessage} interface.
*/
public class RMQBytesMessage extends RMQMessage implements BytesMessage {
/**
* This variable is set true if we are reading, but not writing the message
* and false if we are writing but can not read the message
*/
private volatile boolean reading;
/** buf stores the byte array payload and we read from it directly */
private volatile transient byte[] buf;
/** The position of our read in the byte array buf */
private volatile transient int pos;
/** The stream we write structured and unstructured data to */
private transient RMQByteArrayOutputStream bout;
/** Instantiates a new, writable RMQBytesMessage */
public RMQBytesMessage() {
this(false);
}
/**
* Instantiates a new RMQBytesMessage
* @param reading - true if this message is in a read state
*/
private RMQBytesMessage(boolean reading) {
this.reading = reading;
if (!reading) {
/* If we are in Write state, then create the objects to support that state */
this.bout = new RMQByteArrayOutputStream(DEFAULT_MESSAGE_BODY_SIZE);
}
}
/**
* {@inheritDoc}
*/
@Override
public boolean readBoolean() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_BOOLEAN > this.buf.length)
throw new MessageEOFException(MSG_EOF);
return Bits.getBoolean(this.buf, this.pos++);
}
/**
* {@inheritDoc}
*/
@Override
public byte readByte() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + 1 > this.buf.length)
throw new MessageEOFException(MSG_EOF);
return this.buf[this.pos++];
}
/**
* {@inheritDoc}
*/
@Override
public int readUnsignedByte() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + 1 > this.buf.length)
throw new MessageEOFException(MSG_EOF);
return ((int) (this.buf[this.pos++])) & 0xFF;
}
/**
* {@inheritDoc}
*/
@Override
public short readShort() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_SHORT > this.buf.length)
throw new MessageEOFException(MSG_EOF);
short s = Bits.getShort(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_SHORT;
return s;
}
/**
* {@inheritDoc}
*/
@Override
public int readUnsignedShort() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_SHORT > this.buf.length)
throw new MessageEOFException(MSG_EOF);
short s = Bits.getShort(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_SHORT;
return ((int) s) & 0xFFFF;
}
/**
* {@inheritDoc}
*/
@Override
public char readChar() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_CHAR > this.buf.length)
throw new MessageEOFException(MSG_EOF);
char ch = Bits.getChar(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_CHAR;
return ch;
}
/**
* {@inheritDoc}
*/
@Override
public int readInt() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_INT > this.buf.length)
throw new MessageEOFException(MSG_EOF);
int i = Bits.getInt(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_INT;
return i;
}
/**
* {@inheritDoc}
*/
@Override
public long readLong() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_LONG > this.buf.length)
throw new MessageEOFException(MSG_EOF);
long l = Bits.getLong(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_LONG;
return l;
}
/**
* {@inheritDoc}
*/
@Override
public float readFloat() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_FLOAT > this.buf.length)
throw new MessageEOFException(MSG_EOF);
float flt = Bits.getFloat(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_FLOAT;
return flt;
}
/**
* {@inheritDoc}
*/
@Override
public double readDouble() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (this.pos + Bits.NUM_BYTES_IN_DOUBLE > this.buf.length)
throw new MessageEOFException(MSG_EOF);
double dbl = Bits.getDouble(this.buf, this.pos);
this.pos += Bits.NUM_BYTES_IN_DOUBLE;
return dbl;
}
/**
* {@inheritDoc}
*/
@Override
public String readUTF() throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
int posOfUtfItem = this.pos;
int lenUtfBytes = readUnsignedShort(); // modifies pos if valid
this.pos = posOfUtfItem; // reset in case of failure
int utfItemLen = Bits.NUM_BYTES_IN_SHORT + lenUtfBytes;
if (posOfUtfItem + utfItemLen > this.buf.length) {
throw new MessageFormatException("Not enough bytes in message body for UTF object");
}
byte[] utfBuf = new byte[utfItemLen];
System.arraycopy(this.buf, posOfUtfItem, utfBuf, 0, utfItemLen);
try {
String str = new DataInputStream(new ByteArrayInputStream(utfBuf)).readUTF();
this.pos += utfItemLen;
return str;
} catch (IOException ioe) {
throw new RMQMessageFormatException("UTF String invalid format", ioe);
}
}
/**
* {@inheritDoc}
*/
@Override
public int readBytes(byte[] value) throws JMSException {
return this.readBytes(value, value.length);
}
/**
* {@inheritDoc}
*/
@Override
public int readBytes(byte[] value, int length) throws JMSException {
if (!this.reading)
throw new MessageNotReadableException(NOT_READABLE);
if (length<0 || length>value.length) {
throw new IndexOutOfBoundsException();
}
if (this.pos < this.buf.length) {
int readLen = Math.min(length, this.buf.length - this.pos);
System.arraycopy(this.buf, this.pos, value, 0, readLen);
this.pos += readLen;
return readLen;
}
return -1; // means EOF already
}
/**
* {@inheritDoc}
*/
@Override
public void writeBoolean(boolean value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeBoolean(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeByte(byte value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeByte(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeShort(short value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeShort(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeChar(char value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeChar(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeInt(int value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeInt(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeLong(long value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeLong(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeFloat(float value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeFloat(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeDouble(double value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeDouble(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeUTF(String value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
this.bout.writeUTF(value);
}
/**
* {@inheritDoc}
*/
@Override
public void writeBytes(byte[] value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
try {
this.bout.write(value);
} catch (IOException e) {
throw new RMQJMSException(e);
}
}
/**
* {@inheritDoc}
*/
@Override
public void writeBytes(byte[] value, int offset, int length) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
if (value == null ) {
throw new MessageFormatException("Null byte array");
} else if (offset>=value.length || length<0) {
throw new IndexOutOfBoundsException();
}
this.bout.write(value, offset, length);
}
/**
* {@inheritDoc}
*/
@Override
public void writeObject(Object value) throws JMSException {
if (this.reading || isReadonlyBody())
throw new MessageNotWriteableException(NOT_WRITEABLE);
writePrimitiveData(value, this.bout);
}
/**
* {@inheritDoc}
*/
@Override
public void reset() throws JMSException {
if (this.reading) {
//if we already are reading, all we want to do is reset to the
//beginning of the stream
this.pos = 0;
} else {
if (this.bout != null) {
this.buf = this.bout.toByteArray();
} else {
this.buf = new byte[0];
}
this.pos = 0;
this.reading = true;
this.bout = null;
}
}
/**
* {@inheritDoc}
*/
@Override
public long getBodyLength() throws JMSException {
return this.reading ? this.buf.length : this.bout.size();
}
/**
* {@inheritDoc}
*/
@Override
public void clearBodyInternal() throws JMSException {
this.bout = new RMQByteArrayOutputStream(DEFAULT_MESSAGE_BODY_SIZE);
this.pos = 0;
this.buf = null;
this.reading = false;
}
private byte[] getByteArray() {
if (reading) return this.buf;
else return this.bout.toByteArray();
}
/**
* {@inheritDoc}
*/
@Override
protected void writeBody(ObjectOutput oOut, ByteArrayOutputStream bout) throws IOException {
byte[] buf = getByteArray();
bout.write(buf);
}
@Override
protected void writeAmqpBody(ByteArrayOutputStream baos) throws IOException {
byte[] buf = getByteArray();
baos.write(buf);
}
/**
* {@inheritDoc}
* Structured data (if any) is already read by the time this is called, in which case, for {@link RMQBytesMessage},
* only a byte array remains.
*/
@Override
protected void readBody(ObjectInput inputStream, ByteArrayInputStream bin) throws IOException, ClassNotFoundException {
this.buf = new byte[bin.available()];
bin.read(this.buf);
this.reading = true;
this.pos = 0;
}
@Override
protected void readAmqpBody(byte[] barr) {
this.buf = barr;
this.reading = true;
this.pos = 0;
}
/**
* Utility method to write an object as a primitive or as an object
* @param s the object to write
* @param out the output (normally a stream) to write it to
* @throws MessageFormatException if s is not a recognised type for writing
* @throws NullPointerException if s is null
*/
private static void writePrimitiveData(Object s, RMQByteArrayOutputStream out) throws JMSException {
if(s==null) {
throw new NullPointerException();
} else if (s instanceof Boolean) {
out.writeBoolean((Boolean) s);
} else if (s instanceof Byte) {
out.writeByte((Byte) s);
} else if (s instanceof Short) {
out.writeShort(((Short) s));
} else if (s instanceof Integer) {
out.writeInt((Integer) s);
} else if (s instanceof Long) {
out.writeLong((Long) s);
} else if (s instanceof Float) {
out.writeFloat((Float) s);
} else if (s instanceof Double) {
out.writeDouble((Double) s);
} else if (s instanceof String) {
out.writeUTF((String) s);
} else if (s instanceof Character) {
out.writeChar((Character) s);
} else if (s instanceof byte[]) {
out.write((byte[])s, 0, ((byte[]) s).length);
} else
throw new MessageFormatException(s + " is not a recognized writable type.");
}
/**
* Utility methods for unpacking primitive values out of byte arrays
* using big-endian byte ordering.
* [A modified copy of java.io.Bits, it being package private :-(]
*/
private static abstract class Bits { // prevent ourselves creating an instance
private Bits() {}; // prevent anyone else creating an instance
/*
* Methods for unpacking primitive values from byte arrays starting at
* given offsets.
*/
static final int NUM_BYTES_IN_BOOLEAN = 1;
static boolean getBoolean(byte[] b, int off) {
return b[off] != 0;
}
static final int NUM_BYTES_IN_CHAR = 2;
static char getChar(byte[] b, int off) {
return (char) (((b[off + 1] & 0xFF)) +
((b[off]) << 8));
}
static final int NUM_BYTES_IN_SHORT = 2;
static short getShort(byte[] b, int off) {
return (short) (((b[off + 1] & 0xFF)) +
((b[off]) << 8));
}
static final int NUM_BYTES_IN_INT = 4;
static int getInt(byte[] b, int off) {
return ((b[off + 3] & 0xFF)) +
((b[off + 2] & 0xFF) << 8) +
((b[off + 1] & 0xFF) << 16) +
((b[off]) << 24);
}
static final int NUM_BYTES_IN_FLOAT = 4;
static float getFloat(byte[] b, int off) {
return Float.intBitsToFloat(getInt(b, off));
}
static final int NUM_BYTES_IN_LONG = 8;
static long getLong(byte[] b, int off) {
return ((b[off + 7] & 0xFFL)) +
((b[off + 6] & 0xFFL) << 8) +
((b[off + 5] & 0xFFL) << 16) +
((b[off + 4] & 0xFFL) << 24) +
((b[off + 3] & 0xFFL) << 32) +
((b[off + 2] & 0xFFL) << 40) +
((b[off + 1] & 0xFFL) << 48) +
(((long) b[off]) << 56);
}
static final int NUM_BYTES_IN_DOUBLE = 8;
static double getDouble(byte[] b, int off) {
return Double.longBitsToDouble(getLong(b, off));
}
}
public static RMQMessage recreate(BytesMessage msg) throws JMSException {
msg.reset();
long bodyLength = msg.getBodyLength();
int bodySize = (int) Math.min(Math.max(0L, bodyLength), Integer.MAX_VALUE);
if (bodyLength != bodySize) throw new JMSException(String.format("BytesMessage body invalid length (%s). Negative or too large.", bodyLength));
try {
RMQBytesMessage rmqBMsg = new RMQBytesMessage();
RMQMessage.copyAttributes(rmqBMsg, msg);
byte[] byteArray = new byte[bodySize];
if (bodyLength > 0) {
if (bodySize != msg.readBytes(byteArray, bodySize)) // must read the whole body at once
throw new MessageEOFException("Cannot read all of non-RMQ Message body.");
}
rmqBMsg.writeBytes(byteArray);
rmqBMsg.reset(); // make body read-only and set pointer to start.
return rmqBMsg;
} catch (OutOfMemoryError e) {
throw new RMQJMSException("Body too large for conversion to RMQMessage.", e);
}
}
}
