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/*
* ChunkedInputStream.java
* Copyright (C) 2004 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.http;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.net.ProtocolException;
/**
* Input stream wrapper for the "chunked" transfer-coding.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
*/
public class ChunkedInputStream
extends FilterInputStream
{
private static final byte CR = 0x0d;
private static final byte LF = 0x0a;
/** Size of the chunk we're reading. */
int size;
/** Number of bytes we've read in this chunk. */
int count;
/**
* True when we should read meta-information, false when we should
* read data.
*/
boolean meta;
/** True when we've hit EOF. */
boolean eof;
Headers headers;
/**
* Constructor.
* @param in the response socket input stream
* @param headers the headers to receive additional header lines
*/
public ChunkedInputStream(InputStream in, Headers headers)
{
super(in);
this.headers = headers;
size = -1;
count = 0;
meta = true;
}
public int read()
throws IOException
{
byte[] buf = new byte[1];
int len = read(buf, 0, 1);
if (len == -1)
{
return -1;
}
int ret = (int) buf[0];
if (ret < 0)
{
ret += 0x100;
}
return ret;
}
public int read(byte[] buffer)
throws IOException
{
return read(buffer, 0, buffer.length);
}
public int read(byte[] buffer, int offset, int length)
throws IOException
{
if (eof)
{
return -1;
}
if (meta)
{
// Read chunk header
int c, last = 0;
boolean seenSemi = false;
StringBuffer buf = new StringBuffer();
do
{
c = in.read();
if (c == 0x3b) // ;
{
seenSemi = true;
}
else if (c == 0x0a && last == 0x0d) // CRLF
{
size = Integer.parseInt(buf.toString(), 16);
break;
}
else if (!seenSemi && c >= 0x30)
{
buf.append ((char) c);
}
last = c;
}
while(c != -1);
count = 0;
meta = false;
}
if (size == 0)
{
// Read trailer
headers.parse(in);
eof = true;
return -1;
}
else
{
int canRead = Math.min(size - count, length);
int len = in.read(buffer, offset, canRead);
if (len == -1)
{
// This is an error condition but it isn't clear what we
// should do with it.
eof = true;
return -1;
}
count += len;
if (count == size)
{
// Read CRLF
int c1 = in.read();
int c2 = in.read();
if (c1 == -1 || c2 == -1)
{
// EOF before CRLF: bad, but ignore
eof = true;
return -1;
}
if (c1 != 0x0d || c2 != 0x0a)
{
throw new ProtocolException("expecting CRLF: " + c1 + "," + c2);
}
meta = true;
}
return len;
}
}
}
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