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/*
* Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
package sun.net.httpserver;
import java.io.*;
import java.net.*;
import com.sun.net.httpserver.*;
import com.sun.net.httpserver.spi.*;
/**
* a class which allows the caller to write an arbitrary
* number of bytes to an underlying stream.
* normal close() does not close the underlying stream
*
* This class is buffered.
*
* Each chunk is written in one go as :-
* abcd\r\nxxxxxxxxxxxxxx\r\n
*
* abcd is the chunk-size, and xxx is the chunk data
* If the length is less than 4 chars (in size) then the buffer
* is written with an offset.
* Final chunk is:
* 0\r\n\r\n
*/
class ChunkedOutputStream extends FilterOutputStream
{
private boolean closed = false;
/* max. amount of user data per chunk */
final static int CHUNK_SIZE = 4096;
/* allow 4 bytes for chunk-size plus 4 for CRLFs */
final static int OFFSET = 6; /* initial <=4 bytes for len + CRLF */
private int pos = OFFSET;
private int count = 0;
private byte[] buf = new byte [CHUNK_SIZE+OFFSET+2];
ExchangeImpl t;
ChunkedOutputStream (ExchangeImpl t, OutputStream src) {
super (src);
this.t = t;
}
public void write (int b) throws IOException {
if (closed) {
throw new StreamClosedException ();
}
buf [pos++] = (byte)b;
count ++;
if (count == CHUNK_SIZE) {
writeChunk();
}
assert count < CHUNK_SIZE;
}
public void write (byte[]b, int off, int len) throws IOException {
if (closed) {
throw new StreamClosedException ();
}
int remain = CHUNK_SIZE - count;
if (len > remain) {
System.arraycopy (b,off,buf,pos,remain);
count = CHUNK_SIZE;
writeChunk();
len -= remain;
off += remain;
while (len >= CHUNK_SIZE) {
System.arraycopy (b,off,buf,OFFSET,CHUNK_SIZE);
len -= CHUNK_SIZE;
off += CHUNK_SIZE;
count = CHUNK_SIZE;
writeChunk();
}
}
if (len > 0) {
System.arraycopy (b,off,buf,pos,len);
count += len;
pos += len;
}
if (count == CHUNK_SIZE) {
writeChunk();
}
}
/**
* write out a chunk , and reset the pointers
* chunk does not have to be CHUNK_SIZE bytes
* count must == number of user bytes (<= CHUNK_SIZE)
*/
private void writeChunk () throws IOException {
char[] c = Integer.toHexString (count).toCharArray();
int clen = c.length;
int startByte = 4 - clen;
int i;
for (i=0; i<clen; i++) {
buf[startByte+i] = (byte)c[i];
}
buf[startByte + (i++)] = '\r';
buf[startByte + (i++)] = '\n';
buf[startByte + (i++) + count] = '\r';
buf[startByte + (i++) + count] = '\n';
out.write (buf, startByte, i+count);
count = 0;
pos = OFFSET;
}
public void close () throws IOException {
if (closed) {
return;
}
flush();
try {
/* write an empty chunk */
writeChunk();
out.flush();
LeftOverInputStream is = t.getOriginalInputStream();
if (!is.isClosed()) {
is.close();
}
/* some clients close the connection before empty chunk is sent */
} catch (IOException e) {
} finally {
closed = true;
}
WriteFinishedEvent e = new WriteFinishedEvent (t);
t.getHttpContext().getServerImpl().addEvent (e);
}
public void flush () throws IOException {
if (closed) {
throw new StreamClosedException ();
}
if (count > 0) {
writeChunk();
}
out.flush();
}
}
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