| /* |
| * Copyright (c) 2005, 2007, 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 com.sun.net.httpserver.*; |
| import com.sun.net.httpserver.spi.*; |
| |
| /** |
| * a (filter) input stream which can tell us if bytes are "left over" |
| * on the underlying stream which can be read (without blocking) |
| * on another instance of this class. |
| * |
| * The class can also report if all bytes "expected" to be read |
| * were read, by the time close() was called. In that case, |
| * bytes may be drained to consume them (by calling drain() ). |
| * |
| * isEOF() returns true, when all expected bytes have been read |
| */ |
| abstract class LeftOverInputStream extends FilterInputStream { |
| ExchangeImpl t; |
| ServerImpl server; |
| protected boolean closed = false; |
| protected boolean eof = false; |
| byte[] one = new byte [1]; |
| |
| public LeftOverInputStream (ExchangeImpl t, InputStream src) { |
| super (src); |
| this.t = t; |
| this.server = t.getServerImpl(); |
| } |
| /** |
| * if bytes are left over buffered on *the UNDERLYING* stream |
| */ |
| public boolean isDataBuffered () throws IOException { |
| assert eof; |
| return super.available() > 0; |
| } |
| |
| public void close () throws IOException { |
| if (closed) { |
| return; |
| } |
| closed = true; |
| if (!eof) { |
| eof = drain (ServerConfig.getDrainAmount()); |
| } |
| } |
| |
| public boolean isClosed () { |
| return closed; |
| } |
| |
| public boolean isEOF () { |
| return eof; |
| } |
| |
| protected abstract int readImpl (byte[]b, int off, int len) throws IOException; |
| |
| public synchronized int read () throws IOException { |
| if (closed) { |
| throw new IOException ("Stream is closed"); |
| } |
| int c = readImpl (one, 0, 1); |
| if (c == -1 || c == 0) { |
| return c; |
| } else { |
| return one[0] & 0xFF; |
| } |
| } |
| |
| public synchronized int read (byte[]b, int off, int len) throws IOException { |
| if (closed) { |
| throw new IOException ("Stream is closed"); |
| } |
| return readImpl (b, off, len); |
| } |
| |
| /** |
| * read and discard up to l bytes or "eof" occurs, |
| * (whichever is first). Then return true if the stream |
| * is at eof (ie. all bytes were read) or false if not |
| * (still bytes to be read) |
| */ |
| public boolean drain (long l) throws IOException { |
| int bufSize = 2048; |
| byte[] db = new byte [bufSize]; |
| while (l > 0) { |
| long len = readImpl (db, 0, bufSize); |
| if (len == -1) { |
| eof = true; |
| return true; |
| } else { |
| l = l - len; |
| } |
| } |
| return false; |
| } |
| } |