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/*
D-Bus Java Implementation
Copyright (c) 2005-2006 Matthew Johnson
This program is free software; you can redistribute it and/or modify it
under the terms of either the GNU Lesser General Public License Version 2 or the
Academic Free Licence Version 2.1.
Full licence texts are included in the COPYING file with this program.
*/
package org.freedesktop.dbus;
import static org.freedesktop.dbus.Gettext._;
import java.io.BufferedInputStream;
import java.io.EOFException;
import java.io.InputStream;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.text.MessageFormat;
import cx.ath.matthew.debug.Debug;
import cx.ath.matthew.utils.Hexdump;
import org.freedesktop.dbus.exceptions.DBusException;
import org.freedesktop.dbus.exceptions.MessageTypeException;
import org.freedesktop.dbus.exceptions.MessageProtocolVersionException;
public class MessageReader
{
private InputStream in;
private byte[] buf = null;
private byte[] tbuf = null;
private byte[] header = null;
private byte[] body = null;
private int[] len = new int[4];
public MessageReader(InputStream in)
{
this.in = new BufferedInputStream(in);
}
public Message readMessage() throws IOException, DBusException
{
int rv;
/* Read the 12 byte fixed header, retrying as neccessary */
if (null == buf) { buf = new byte[12]; len[0] = 0; }
if (len[0] < 12) {
try { rv = in.read(buf, len[0], 12-len[0]); }
catch (SocketTimeoutException STe) { return null; }
if (-1 == rv) throw new EOFException(_("Underlying transport returned EOF"));
len[0] += rv;
}
if (len[0] == 0) return null;
if (len[0] < 12) {
if (Debug.debug) Debug.print(Debug.DEBUG, "Only got "+len[0]+" of 12 bytes of header");
return null;
}
/* Parse the details from the header */
byte endian = buf[0];
byte type = buf[1];
byte protover = buf[3];
if (protover > Message.PROTOCOL) {
buf = null;
throw new MessageProtocolVersionException(MessageFormat.format(_("Protocol version {0} is unsupported"), new Object[] { protover }));
}
/* Read the length of the variable header */
if (null == tbuf) { tbuf = new byte[4]; len[1] = 0; }
if (len[1] < 4) {
try { rv = in.read(tbuf, len[1], 4-len[1]); }
catch (SocketTimeoutException STe) { return null; }
if (-1 == rv) throw new EOFException(_("Underlying transport returned EOF"));
len[1] += rv;
}
if (len[1] < 4) {
if (Debug.debug) Debug.print(Debug.DEBUG, "Only got "+len[1]+" of 4 bytes of header");
return null;
}
/* Parse the variable header length */
int headerlen = 0;
if (null == header) {
headerlen = (int) Message.demarshallint(tbuf, 0, endian, 4);
if (0 != headerlen % 8)
headerlen += 8-(headerlen%8);
} else
headerlen = header.length-8;
/* Read the variable header */
if (null == header) {
header = new byte[headerlen+8];
System.arraycopy(tbuf, 0, header, 0, 4);
len[2] = 0;
}
if (len[2] < headerlen) {
try { rv = in.read(header, 8+len[2], headerlen-len[2]); }
catch (SocketTimeoutException STe) { return null; }
if (-1 == rv) throw new EOFException(_("Underlying transport returned EOF"));
len[2] += rv;
}
if (len[2] < headerlen) {
if (Debug.debug) Debug.print(Debug.DEBUG, "Only got "+len[2]+" of "+headerlen+" bytes of header");
return null;
}
/* Read the body */
int bodylen = 0;
if (null == body) bodylen = (int) Message.demarshallint(buf, 4, endian, 4);
if (null == body) { body=new byte[bodylen]; len[3] = 0; }
if (len[3] < body.length) {
try { rv = in.read(body, len[3], body.length-len[3]); }
catch (SocketTimeoutException STe) { return null; }
if (-1 == rv) throw new EOFException(_("Underlying transport returned EOF"));
len[3] += rv;
}
if (len[3] < body.length) {
if (Debug.debug) Debug.print(Debug.DEBUG, "Only got "+len[3]+" of "+body.length+" bytes of body");
return null;
}
Message m;
switch (type) {
case Message.MessageType.METHOD_CALL:
m = new MethodCall();
break;
case Message.MessageType.METHOD_RETURN:
m = new MethodReturn();
break;
case Message.MessageType.SIGNAL:
m = new DBusSignal();
break;
case Message.MessageType.ERROR:
m = new Error();
break;
default:
throw new MessageTypeException(MessageFormat.format(_("Message type {0} unsupported"), new Object[] {type}));
}
if (Debug.debug) {
Debug.print(Debug.VERBOSE, Hexdump.format(buf));
Debug.print(Debug.VERBOSE, Hexdump.format(tbuf));
Debug.print(Debug.VERBOSE, Hexdump.format(header));
Debug.print(Debug.VERBOSE, Hexdump.format(body));
}
try {
m.populate(buf, header, body);
} catch (DBusException DBe) {
if (AbstractConnection.EXCEPTION_DEBUG && Debug.debug) Debug.print(Debug.ERR, DBe);
buf = null;
tbuf = null;
body = null;
header = null;
throw DBe;
} catch (RuntimeException Re) {
if (AbstractConnection.EXCEPTION_DEBUG && Debug.debug) Debug.print(Debug.ERR, Re);
buf = null;
tbuf = null;
body = null;
header = null;
throw Re;
}
if (Debug.debug) {
Debug.print(Debug.INFO, "=> "+m);
}
buf = null;
tbuf = null;
body = null;
header = null;
return m;
}
public void close() throws IOException
{
if (Debug.debug) Debug.print(Debug.INFO, "Closing Message Reader");
in.close();
}
}
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