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/*
* ArticleStream.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.nntp;
import java.io.BufferedInputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
/**
* A stream that can be told to read to the end of its data.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
*/
public final class ArticleStream
extends FilterInputStream
implements PendingData
{
private static final int LF = 0x0a;
private static final int DOT = 0x2e;
boolean eol;
boolean eof;
ArticleStream(InputStream in)
{
super(in.markSupported() ? in : new BufferedInputStream(in));
eol = true;
eof = false;
}
public int read()
throws IOException
{
if (eof)
{
return -1;
}
int c = in.read();
// Check for LF
if (c == LF)
{
eol = true;
}
else if (eol)
{
if (c == DOT)
{
in.mark(1);
int d = in.read();
if (d == DOT)
{
// Not resetting here means that 2 dots are collapsed into 1
}
else if (d == LF)
{
// Check for LF
eof = true;
return -1;
}
else
{
in.reset();
}
}
eol = false;
}
return c;
}
public int read(byte[] b)
throws IOException
{
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len)
throws IOException
{
if (eof)
{
return -1;
}
int l = in.read(b, off, len);
if (l > 0)
{
if (eol)
{
if (b[off] == DOT && l > 1)
{
if (b[off + 1] == DOT)
{
// Truncate b
System.arraycopy(b, off + 1, b, off, l - off);
l--;
}
else if (b[off + 1] == LF)
{
// EOF
eof = true;
return -1;
}
}
}
eol = (b[(off + l) - 1] == LF);
}
return l;
}
/**
* Read to the end of the article data.
*/
public void readToEOF()
throws IOException
{
if (available() == 0)
{
return;
}
byte[] buf = new byte[4096];
int ret = 0;
while (ret != -1)
{
ret = read(buf);
}
}
}
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