| /* |
| * Copyright (c) 2005, 2008, Oracle and/or its affiliates. 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.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(); |
| } |
| } |