/* * Created on 2004.08.17 * JFreeMail - Java mail component * Copyright (C) 2004 Dalibor Krleza *  * This library 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 2.1 of the License, or (at your option) any later version. *  * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */ package org.jfreemail.core;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.Socket;import java.util.Vector;/** * Class with core methods for socket operation. All methods static. */public class JfmSocketCore {	/**	 * Special method for reading multiple text lines from socket. Text lines	 * are separated on CRLF chars and stored into string array.	 * @param client_socket Socket with connection to server.	 * @return String array with incoming information.	 * @throws IOException Thrown on socket error.	 */	public static String[] getLine(Socket client_socket) throws IOException{		InputStream is=client_socket.getInputStream();		int length=0,i;		byte[] in_buffer=new byte[2048];		Vector result=new Vector();		String out=new String();		while(true) {			/*			 * Reading buffer from client socket. If reading full buffer, this line			 * will be called more than once. If reading number of bytes multiple			 * to buffer size, last buffer length will be 0. On the other hand, on			 * reading not full buffer, exiting immediately.			 */			length=is.read(in_buffer,0,2048);			for(i=0;i<length;i++) {				out+=(char)in_buffer[i];				/*				 * Testing CRLF. If detected CRLF, store line into vector. We will				 * create string array later.				 */				if (out.length()>=2 && out.charAt(out.length()-1)==(char)10 					&& out.charAt(out.length()-2)==(char)13) {						result.add(out);						out=new String();					}			}			if (length<2048) {				/*				 * Now we have readed all info from socket. Creating string				 * array from vector. I wanted to decrease memory use with				 * string array.				 */				String[] result_list=new String[result.size()];				for(i=0;i<result.size();i++)					result_list[i]=(String)result.elementAt(i);				return result_list;			}			length=0;		}	}		/**	 * Special method for reading binary buffer from client socket. This method	 * is used when unable to detect charset for reading lines.	 * @param client_socket Client socket with connection to server.	 * @return Binary array.	 * @throws IOException Thrown on communication error.	 */	public static byte[] getBinary(Socket client_socket) throws IOException{		InputStream is=client_socket.getInputStream();		int length=0;		byte[] in_buffer=new byte[2048];		/*		 * We don't know size of readed byte stream. So it's logical to store		 * this byte array into stream object. For decreasing memory consumption		 * we will pull out only binary array.		 */		ByteArrayOutputStream bos=new ByteArrayOutputStream();		while(true) {			length=is.read(in_buffer,0,2048);			bos.write(in_buffer,0,length);			if (length<2048) {				return bos.toByteArray();			}			length=0;		}	}}