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/*
This file is part of GNUnet.
Copyright (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.ProtocolViolationException;
import org.gnunet.construct.ReflectUtil;
import java.lang.reflect.Field;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
import java.util.List;
/**
*
* todo: error checking on numeric overflow
*/
public class IntegerParser implements Parser {
public static final boolean UNSIGNED = false;
public static final boolean SIGNED = true;
private final int byteSize;
private final boolean isSigned;
private final ReflectUtil.NumField targetField;
public IntegerParser(final int byteSize, final boolean isSigned,
final Field f) {
this.byteSize = byteSize;
this.isSigned = isSigned;
targetField = new ReflectUtil.NumField(f);
}
@Override
public int getSize(final Message srcObj) {
return byteSize;
}
@Override
public int parse(final ByteBuffer srcBuf, int frameOffset, Message frameObj, final Message dstObj, List<Field>
frameSizePath) {
try {
if (targetField.isBig()) {
targetField.set(dstObj, IntegerUtil.readBigInteger(srcBuf, isSigned, byteSize));
} else {
targetField.set(dstObj, IntegerUtil.readLong(srcBuf, isSigned, byteSize));
}
} catch (BufferUnderflowException e) {
throw new ProtocolViolationException("Underflow while parsing " + targetField);
}
return byteSize;
}
@Override
public int write(final ByteBuffer dstBuf, final Message srcObj) {
if (targetField.isBig()) {
IntegerUtil.writeBitInteger(targetField.getBig(srcObj), dstBuf, isSigned, byteSize);
} else {
// todo: error checking on numeric overflow, if requested
IntegerUtil.writeLong(targetField.get(srcObj), dstBuf, isSigned, byteSize);
}
return byteSize;
}
@Override
public void patch(Message m, int frameSize, List<Field> frameSizePath, Message frameObj) {
// todo: optimize this!
/*
if (frameSizePath != null) {
ReflectUtil.justSetInt(frameObj, frameSizePath, frameSize);
}
*/
}
@Override
public int getStaticSize() {
return byteSize;
}
}
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