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*
* Licensed to the Apache Software Foundation (ASF) under one
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* 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.
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package org.apache.qpid.proton.engine.impl;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.qpid.proton.codec.DecodeException;
import org.apache.qpid.proton.codec.DecoderImpl;
import org.apache.qpid.proton.codec.EncoderImpl;
import org.apache.qpid.proton.engine.EndpointError;
import org.apache.qpid.proton.engine.ProtonException;
import org.apache.qpid.proton.engine.FrameTransport;
import org.apache.qpid.proton.engine.TransportException;
import org.apache.qpid.proton.engine.TransportInput;
import org.apache.qpid.proton.framing.TransportFrame;
import org.apache.qpid.proton.type.AMQPDefinedTypes;
import org.apache.qpid.proton.type.Binary;
import org.apache.qpid.proton.type.transport.FrameBody;
import java.nio.ByteBuffer;
import java.util.Formatter;
class FrameParser implements TransportInput
{
public static final byte[] HEADER = new byte[8];
private EndpointError _localError;
private Logger _traceLogger = Logger.getLogger("proton.trace");
private Logger _rawLogger = Logger.getLogger("proton.raw");
private FrameTransport _frameTransport;
private TransportFrame _heldFrame;
static
{
HEADER[0] = (byte) 'A';
HEADER[1] = (byte) 'M';
HEADER[2] = (byte) 'Q';
HEADER[3] = (byte) 'P';
HEADER[4] = 0;
HEADER[5] = 1;
HEADER[6] = 0;
HEADER[7] = 0;
}
enum State
{
HEADER0,
HEADER1,
HEADER2,
HEADER3,
HEADER4,
HEADER5,
HEADER6,
HEADER7,
SIZE_0,
SIZE_1,
SIZE_2,
SIZE_3,
PRE_PARSE,
BUFFERING,
PARSING,
ERROR
}
private State _state = State.HEADER0;
private int _size;
private ByteBuffer _buffer;
private DecoderImpl _decoder = new DecoderImpl();
private EncoderImpl _encoder = new EncoderImpl(_decoder);
{
AMQPDefinedTypes.registerAllTypes(_decoder);
}
FrameParser(FrameTransport frameTransport)
{
_frameTransport = frameTransport;
}
public int input(byte[] bytes, int offset, final int length)
{
if(_heldFrame != null)
{
if(_frameTransport.input(_heldFrame))
{
_heldFrame = null;
}
else
{
return 0;
}
}
int unconsumed = length;
EndpointError frameParsingError = null;
int size = _size;
State state = _state;
ByteBuffer oldIn = null;
ByteBuffer in = ByteBuffer.wrap(bytes, offset, unconsumed);
boolean transportAccepting = true;
while(in.hasRemaining() && state != State.ERROR && transportAccepting)
{
switch(state)
{
case HEADER0:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[0])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[0]);
state = State.ERROR;
break;
}
state = State.HEADER1;
}
else
{
break;
}
case HEADER1:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[1])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[1]);
state = State.ERROR;
break;
}
state = State.HEADER2;
}
else
{
break;
}
case HEADER2:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[2])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[2]);
state = State.ERROR;
break;
}
state = State.HEADER3;
}
else
{
break;
}
case HEADER3:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[3])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[3]);
state = State.ERROR;
break;
}
state = State.HEADER4;
}
else
{
break;
}
case HEADER4:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[4])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[4]);
state = State.ERROR;
break;
}
state = State.HEADER5;
}
else
{
break;
}
case HEADER5:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[5])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[5]);
state = State.ERROR;
break;
}
state = State.HEADER6;
}
else
{
break;
}
case HEADER6:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[6])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[6]);
state = State.ERROR;
break;
}
state = State.HEADER7;
}
else
{
break;
}
case HEADER7:
if(in.hasRemaining())
{
byte c = in.get();
if(c != HEADER[7])
{
frameParsingError = createFramingError("AMQP header mismatch value %x, expecting %x", c, HEADER[7]);
state = State.ERROR;
break;
}
state = State.SIZE_0;
}
else
{
break;
}
case SIZE_0:
if(!in.hasRemaining())
{
break;
}
if(in.remaining() >= 4)
{
size = in.getInt();
state = State.PRE_PARSE;
break;
}
else
{
size = (in.get() << 24) & 0xFF000000;
if(!in.hasRemaining())
{
state = State.SIZE_1;
break;
}
}
case SIZE_1:
size |= (in.get() << 16) & 0xFF0000;
if(!in.hasRemaining())
{
state = State.SIZE_2;
break;
}
case SIZE_2:
size |= (in.get() << 8) & 0xFF00;
if(!in.hasRemaining())
{
state = State.SIZE_3;
break;
}
case SIZE_3:
size |= in.get() & 0xFF;
state = State.PRE_PARSE;
case PRE_PARSE:
;
if(size < 8)
{
frameParsingError = createFramingError("specified frame size %d smaller than minimum frame header "
+ "size %d",
_size, 8);
state = State.ERROR;
break;
}
if(in.remaining() < size-4)
{
_buffer = ByteBuffer.allocate(size-4);
_buffer.put(in);
state = State.BUFFERING;
break;
}
case BUFFERING:
if(_buffer != null)
{
if(in.remaining() < _buffer.remaining())
{
_buffer.put(in);
break;
}
else
{
ByteBuffer dup = in.duplicate();
dup.limit(dup.position()+_buffer.remaining());
int i = _buffer.remaining();
int d = dup.remaining();
in.position(in.position()+_buffer.remaining());
_buffer.put(dup);
oldIn = in;
_buffer.flip();
in = _buffer;
state = State.PARSING;
}
}
case PARSING:
int dataOffset = (in.get() << 2) & 0x3FF;
if(dataOffset < 8)
{
frameParsingError = createFramingError("specified frame data offset %d smaller than minimum frame header size %d", dataOffset, 8);
state = State.ERROR;
break;
}
else if(dataOffset > size)
{
frameParsingError = createFramingError("specified frame data offset %d larger than the frame size %d", dataOffset, _size);
state = State.ERROR;
break;
}
// type
int type = in.get() & 0xFF;
int channel = in.getShort() & 0xFF;
if(type != 0)
{
frameParsingError = createFramingError("unknown frame type: %d", type);
state = State.ERROR;
break;
}
if(dataOffset!=8)
{
in.position(in.position()+dataOffset-8);
}
// oldIn null iff not working on duplicated buffer
if(oldIn == null)
{
oldIn = in;
in = in.duplicate();
final int endPos = in.position() + size - dataOffset;
in.limit(endPos);
oldIn.position(endPos);
}
try
{
_decoder.setByteBuffer(in);
Object val = _decoder.readObject();
Binary payload;
if(in.hasRemaining())
{
byte[] payloadBytes = new byte[in.remaining()];
in.get(payloadBytes);
payload = new Binary(payloadBytes);
}
else
{
payload = null;
}
if(val instanceof FrameBody)
{
FrameBody frameBody = (FrameBody) val;
if(_traceLogger.isLoggable(Level.FINE))
{
_traceLogger.log(Level.FINE, "IN: CH["+channel+"] : " + frameBody + (payload == null ? "" : "[" + payload + "]"));
}
TransportFrame frame = new TransportFrame(channel, frameBody, payload);
if(!_frameTransport.input(frame))
{
transportAccepting = false;
_heldFrame = frame;
}
}
else
{
// TODO - error
}
reset();
in = oldIn;
oldIn = null;
_buffer = null;
state = State.SIZE_0;
break;
}
catch (DecodeException ex)
{
state = State.ERROR;
frameParsingError = createFramingError(ex.getMessage());
}
}
}
_state = state;
_size = size;
_localError = frameParsingError;
if(_state == State.ERROR )
{
throw new TransportException(frameParsingError.getDescription());
}
return _state == State.ERROR ? -1 : length - in.remaining();
}
private void reset()
{
_size = 0;
_state = State.SIZE_0;
}
private EndpointError createFramingError(String description, Object... args)
{
Formatter formatter = new Formatter();
formatter.format(description, args);
return new EndpointError("ERROR", formatter.toString());
}
}
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