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/*
* CRLFInputStream.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.BufferedInputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
/**
* An input stream that filters out CR/LF pairs into LFs.
*
* @author <a href="mailto:dog@gnu.org">Chris Burdess</a>
*/
public class CRLFInputStream
extends FilterInputStream
{
/**
* The CR octet.
*/
public static final int CR = 13;
/**
* The LF octet.
*/
public static final int LF = 10;
private boolean doReset;
/**
* Constructs a CR/LF input stream connected to the specified input
* stream.
*/
public CRLFInputStream(InputStream in)
{
super(in.markSupported() ? in : new BufferedInputStream(in));
}
/**
* Reads the next byte of data from this input stream.
* Returns -1 if the end of the stream has been reached.
* @exception IOException if an I/O error occurs
*/
public int read()
throws IOException
{
int c = in.read();
if (c == CR)
{
in.mark(1);
int d = in.read();
if (d == LF)
{
c = d;
}
else
{
in.reset();
}
}
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
{
in.mark(len + 1);
int l = in.read(b, off, len);
if (l > 0)
{
int i = indexOfCRLF(b, off, l);
if (doReset)
{
in.reset();
if (i != -1)
{
l = in.read(b, off, i + 1); // read to CR
in.read(); // skip LF
b[i] = LF; // fix CR as LF
}
else
{
l = in.read(b, off, len); // CR(s) but no LF
}
}
}
return l;
}
private int indexOfCRLF(byte[] b, int off, int len)
throws IOException
{
doReset = false;
int lm1 = len - 1;
for (int i = off; i < len; i++)
{
if (b[i] == CR)
{
int d;
if (i == lm1)
{
d = in.read();
doReset = true;
}
else
{
d = b[i + 1];
}
if (d == LF)
{
doReset = true;
return i;
}
}
}
return -1;
}
}
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