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/*
This file is part of GNUnet.
(C) 2011, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.construct.parsers;
import org.gnunet.construct.Message;
import org.gnunet.construct.ReflectUtil;
import org.gnunet.construct.ProtocolViolation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.util.List;
/**
* Parse a byte array that takes up all the remaining space in its frame.
* A 0-element array takes up no space.
* 'null' is an invalid value for a field of this type.
*
* @author Florian Dold
*
*/
public class ByteFillParser implements Parser {
private static final Logger logger = LoggerFactory
.getLogger(ByteFillParser.class);
private final Field targetField;
public ByteFillParser(Field field) {
targetField = field;
}
@Override
public int getSize(Message src) {
return Array.getLength(ReflectUtil.justGet(src, targetField));
}
@Override
public int parse(ByteBuffer srcBuf, int frameOffset, Message frameObj, Message dst, List<Field> frameSizePath) {
int frameSize = ReflectUtil.justGetInt(frameObj, frameSizePath);
int remaining = frameOffset + frameSize - srcBuf.position();
if (remaining < 0) {
throw new ProtocolViolation("negative size remaining for variable size message");
}
if (remaining == 0) {
ReflectUtil.justSet(dst, targetField, new byte[0]);
return 0;
}
byte[] a = new byte[remaining];
srcBuf.get(a);
ReflectUtil.justSet(dst, targetField, a);
return frameOffset;
}
@Override
public int write(ByteBuffer dstBuf, Message src) {
byte[] a = (byte[]) ReflectUtil.justGet(src, targetField);
dstBuf.put(a);
return a.length;
}
@Override
public void patch(Message message, int frameSize, List<Field> frameSizePath, Message frameObject) {
// the size field is contained in the frameObject
ReflectUtil.justSetInt(frameObject, frameSizePath, frameSize);
}
@Override
public int getStaticSize() {
// not known!
return 0;
}
}
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