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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.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.util.List;
public class StringParser implements Parser {
private final String cset;
private final boolean optional;
private final Field targetField;
public StringParser(final String charset, boolean optional, final Field f) {
this.targetField = f;
this.optional = optional;
this.cset = charset;
}
@Override
public int getSize(final Message srcObj) {
final String s = (String) ReflectUtil.justGet(srcObj, targetField);
if (s == null) {
if (optional) {
return 0;
} else {
throw new AssertionError("non-optional string in field '" + targetField + "' cannot be null");
}
}
try {
final byte[] b = s.getBytes(cset);
return b.length + 1;
} catch (final UnsupportedEncodingException e) {
throw new RuntimeException();
}
}
@Override
public int parse(final ByteBuffer srcBuf, int frameOffset, Message frameObj, final Message dstObj, List<Field>
frameSizePath) {
if (optional) {
if (frameSizePath == null) {
throw new AssertionError("optional string with no length field in the message!");
}
final int frameSize = ReflectUtil.justGetInt(frameObj, frameSizePath);
int remaining = frameOffset + frameSize - srcBuf.position();
if (remaining == 0) {
if (!optional) {
throw new ProtocolViolationException("no data received for non-optional string");
}
ReflectUtil.justSet(dstObj, targetField, null);
return 0;
}
}
if (!srcBuf.hasRemaining()) {
throw new ProtocolViolationException("no data for non-optional string field " +
targetField);
}
int length = 0;
while (srcBuf.get(srcBuf.position() + length) != 0) {
length++;
}
final byte[] stringData = new byte[length];
srcBuf.get(stringData);
if (srcBuf.get() != 0) {
throw new AssertionError("programming error");
}
String str;
try {
str = new String(stringData, cset);
} catch (final UnsupportedEncodingException e) {
throw new RuntimeException();
}
ReflectUtil.justSet(dstObj, targetField, str);
return length + 1;
}
@Override
public int write(final ByteBuffer dstBuf, final Message srcObj) {
String s = (String) ReflectUtil.justGet(srcObj, targetField);
if (s == null) {
if (!optional) {
throw new AssertionError("non-optional string cannot be null");
}
return 0;
}
byte[] b;
try {
b = s.getBytes(cset);
} catch (final UnsupportedEncodingException e) {
throw new RuntimeException();
}
dstBuf.put(b);
dstBuf.put((byte) 0);
// +1 for the 0-byte
return b.length + 1;
}
@Override
public void patch(Message m, int frameSize, List<Field> frameSizePath, Message frameObj) {
if (frameSizePath != null) {
ReflectUtil.justSetInt(frameObj, frameSizePath, frameSize);
}
}
@Override
public int getStaticSize() {
return optional ? 0 : 1;
}
}
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