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/*
This file is part of GNUnet.
(C) 2012, 2013 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.
*/
/*
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.StringTerminationType;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.util.List;
public class VariableSizeStringParser implements Parser {
private final Field targetField;
private ReflectUtil.NumField sizeField;
private StringTerminationType terminationType;
public VariableSizeStringParser(StringTerminationType terminationType,
Field sizeField, Field arrayField) {
targetField = arrayField;
this.sizeField = new ReflectUtil.NumField(sizeField);
this.terminationType = terminationType;
}
@Override
public int getSize(final Message src) {
final String str = (String) ReflectUtil.justGet(src, targetField);
if (str == null) {
throw new RuntimeException("string");
}
switch (terminationType) {
case NONE:
return str.length();
case ZERO_EXCLUDED:
return str.length() + 1;
case ZERO_INCLUDED:
return str.length() + 1;
default:
throw new AssertionError();
}
}
@Override
public int parse(final ByteBuffer srcBuf, int frameOffset, Message frameObj, final Message dstObj, List<Field>
frameSizePath) {
final int size = (int) sizeField.get(dstObj);
final int strSize;
final int skipSize;
switch (terminationType) {
case NONE:
strSize = size;
skipSize = 0;
break;
case ZERO_EXCLUDED:
strSize = size;
skipSize = 1;
break;
case ZERO_INCLUDED:
strSize = size-1;
skipSize = 1;
break;
default:
throw new AssertionError();
}
byte[] data = new byte[strSize];
srcBuf.get(data);
srcBuf.position(srcBuf.position() + skipSize);
ReflectUtil.justSet(dstObj, targetField, new String(data));
return size;
}
@Override
public int write(final ByteBuffer dstBuf, final Message src) {
int n;
final String str = (String) ReflectUtil.justGet(src, targetField);
if (str == null) {
throw new RuntimeException("string must not be null");
}
byte[] data = str.getBytes();
switch (terminationType) {
case NONE:
dstBuf.put(data);
n = data.length;
break;
case ZERO_INCLUDED:
dstBuf.put(data);
dstBuf.put((byte) 0);
n = data.length + 1;
break;
case ZERO_EXCLUDED:
dstBuf.put(data);
dstBuf.put((byte) 0);
n = data.length + 1;
break;
default:
throw new AssertionError();
}
return n;
}
@Override
public void patch(Message m, int frameSize, List<Field> frameSizePath, Message frameObj) {
int size;
final String str = (String) ReflectUtil.justGet(m, targetField);
if (str == null) {
throw new RuntimeException("string must not be null");
}
if (terminationType == StringTerminationType.ZERO_INCLUDED) {
size = str.length() + 1;
} else {
size = str.length();
}
sizeField.set(m, size);
}
@Override
public int getStaticSize() {
return 0;
}
}
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