/* * Copyright (C) 2008 Andrea Zito *  * This file is part of jMmsLib. * * jMmsLib is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as  * published by the Free Software Foundation, either version 3 of  * the License, or  (at your option) any later version. * * jMmsLib 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public  * License along with jMmsLib.  If not, see <http://www.gnu.org/licenses/>. */ package net.sourceforge.jmmslib;/** * Decodes a binary mms object in a MmsMessage class. * <p>Actually this class is very limited and it is only capable of decoding <i>send_conf</i> * mms messages.</p> * @author Andrea Zito * */public class MmsDecoder {	/*=========================================================================	 * CLASS VARIABLES	 *=========================================================================*/	private byte[] binaryMms;		/*=========================================================================	 * CONSTRUCTORS	 *=========================================================================*/	/**	 * Creates an MmsDecoder object for the specified binary mms object	 */	public MmsDecoder(byte[] binaryMms){		this.binaryMms = binaryMms;	}		/*=========================================================================	 * METHODS	 *=========================================================================*/	/**	 * Docedes the message type.<br>	 * Actually the only supported value is {@link MmsMessage#MMS_MESSAGE_TYPE_SEND_CONF}	 */	private String decodeMessageType(byte msgType) throws MmsDecoderException{		if (msgType == MmsEncoder.MMS_MESSAGE_TYPE_SEND_CONF) return MmsMessage.MMS_MESSAGE_TYPE_SEND_CONF;		else throw new MmsDecoderException("Response message type not supported.");	}		/**	 * Decodes the response status.	 * 	 * @param status	 * @return name of the specified status	 * @throws MmsDecoderException status not supported	 * @see MmsMessage#setResponseStatus(String)	 */	private String decodeResponseStatus(byte status) throws MmsDecoderException{		if (status == MmsEncoder.MMS_RESPONSE_STATUS_OK) return MmsMessage.MMS_RESPONSE_STATUS_OK;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_CONTENT_NOT_ACCEPTED) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_CONTENT_NOT_ACCEPTED;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_MESSAGE_FORMAT_CORRUPT) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_MESSAGE_FORMAT_CORRUPT;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_MESSAGE_NOT_FOUND) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_MESSAGE_NOT_FOUND;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_NETWORK_PROBLEM) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_NETWORK_PROBLEM;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_SENDING_ADDRESS_UNRESOLVED) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_SENDING_ADDRESS_UNRESOLVED;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_SERVICE_DENIED) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_SERVICE_DENIED;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_UNSPECIFIED) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_UNSPECIFIED;		else if (status == MmsEncoder.MMS_RESPONSE_STATUS_ERROR_UNSUPPORTED_MESSAGE) return MmsMessage.MMS_RESPONSE_STATUS_ERROR_UNSUPPORTED_MESSAGE;		else throw new MmsDecoderException("Response status not supported");	}		/**	 * Decodes the message version.	 * 	 * @param version encoded version	 * @return message version	 * @throws MmsMessageException	 */	private String decodeMessageVersion(byte version) throws MmsMessageException{		if (version == MmsEncoder.MMS_VERSION_1) return MmsMessage.MMS_VERSION_1;		else throw new MmsMessageException("Response message version not supported");	}	/**	 * Decodes a <i>send_conf</i> mms message.	 * 	 * @return decoded message	 * @throws MmsDecoderException error decoding the message	 * @throws MmsMessageException error filling up the value of the message 	 */	public MmsMessage decodeMessage() throws MmsDecoderException, MmsMessageException{		MmsMessage mms = new MmsMessage();		try{			//Parse Message Type			if (binaryMms[0] != (MmsEncoder.H_MMS_MESSAGE_TYPE + MmsEncoder.H_BASE))				throw new MmsDecoderException("Malformed response message");			mms.setMessageType(decodeMessageType(binaryMms[1]));			//Parse Transaction ID					if (binaryMms[2] != MmsEncoder.H_MMS_TRANSACTION_ID + MmsEncoder.H_BASE)				throw new MmsDecoderException("Malformed response message");			int i=0;			StringBuffer transId = new StringBuffer("");			for (i=3; binaryMms[i]!=0; i++){				transId.append((char)binaryMms[i]);			}			mms.setTransactionID(transId.toString());			//Parse Message Version			if (binaryMms[++i] != (MmsEncoder.H_MMS_VERSION + MmsEncoder.H_BASE))				throw new MmsDecoderException("Malformed response message");			mms.setVersion(decodeMessageVersion(binaryMms[++i]));			//Parse Message Status			if (binaryMms[++i] != (MmsEncoder.H_MMS_RESPONSE_STATUS + MmsEncoder.H_BASE))				throw new MmsDecoderException("Malformed response message");			mms.setResponseStatus(decodeResponseStatus(binaryMms[++i]));			//Parse Message Status Text			if (binaryMms.length >= ++i && binaryMms[i] == (MmsEncoder.H_MMS_RESPONSE_TEXT + MmsEncoder.H_BASE)){				StringBuffer responseText= new StringBuffer("");				for (i=i+1; binaryMms[i]!=0; i++){					responseText.append((char)binaryMms[i]);				}				mms.setResponseText(responseText.toString());			}		}catch (ArrayIndexOutOfBoundsException e){			throw new MmsDecoderException("Malformed response message");		}				return mms;	}}