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/*
* MessageInputStream.java
* 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
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
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 <code>read</code> when the stream termination
* sequence LF,END,LF is read from the underlying stream.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
*/
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 < end; i++)
{
c = read();
if (c == -1)
{
len = i - off;
break;
}
else
{
b[i] = (byte) c;
}
}
return len;
}
public boolean markSupported()
{
return in.markSupported();
}
public void mark(int readlimit)
{
in.mark(readlimit);
markBuf1 = buf1;
markBuf2 = buf2;
}
public void reset()
throws IOException
{
in.reset();
buf1 = markBuf1;
buf2 = markBuf2;
}
}
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