/* * $Id: MessageInputStream.java,v 1.1 2003/10/19 08:51:37 dog Exp $ * Copyright (C) 2002 The Free Software Foundation * * This file is part of GNU inetlib, a library. * * GNU inetlib 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 2 of the License, or * (at your option) any later version. * * GNU inetlib 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * As a special exception, if you link this library with other files to * produce an executable, this library does not by itself cause the * resulting executable to be covered by the GNU General Public License. * This exception does not however invalidate any other reasons why the * executable file might be covered by the GNU General Public License. */ package gnu.inet.util; import java.io.FilterInputStream; import java.io.InputStream; import java.io.IOException; /** * A utility class for feeding message contents to messages. * This stream returns -1 from read when the stream termination * sequence LF,END,LF is read from the underlying stream. * * @author Chris Burdess * @version $Revision: 1.1 $ $Date: 2003/10/19 08:51:37 $ */ public class MessageInputStream extends FilterInputStream { /** * The stream termination octet ('.'). */ public static final int END = 46; /** * The line termination octet ('\n'). */ public static final int LF = 10; protected boolean eof; protected int buf1 = -1; protected int buf2 = -1; protected int markBuf1; protected int markBuf2; /** * Constructs a message input stream connected to the specified input stream. */ public MessageInputStream(InputStream in) { super(in); eof = false; } /** * Reads the next byte of data from this message input stream. * Returns -1 if the end of the message stream has been reached. * @exception IOException if an I/O error occurs */ public int read() throws IOException { if (eof) return -1; int c; if (buf1!=-1) { c = buf1; buf1 = buf2; buf2 = -1; } else c = super.read(); if (c==LF) { if (buf1==-1) { buf1 = super.read(); if (buf1==END) { buf2 = super.read(); if (buf2==LF) { eof = true; // Allow the final LF to be read } } } else if (buf1==END) { if (buf2==-1) { buf2 = super.read(); if (buf2==LF) eof = true; } else if (buf2==LF) eof = true; } } return c; } /** * Reads up to b.length bytes of data from this input stream into * an array of bytes. * Returns -1 if the end of the stream has been reached. * @exception IOException if an I/O error occurs */ public int read(byte[] b) throws IOException { return read(b, 0, b.length); } /** * Reads up to len bytes of data from this input stream into an * array of bytes, starting at the specified offset. * Returns -1 if the end of the stream has been reached. * @exception IOException if an I/O error occurs */ public int read(byte[] b, int off, int len) throws IOException { if (eof) return -1; int c, end = off+len; for (int i=off; i