/*

 * Copyright (c) 2005, 2006, 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 up to a defined

 * number of bytes to an underlying stream. The caller *must*

 * write the pre-defined number or else an exception will be thrown

 * and the whole request aborted.

 * normal close() does not close the underlying stream

 */

class FixedLengthOutputStream extends FilterOutputStream

{

    private long remaining;

    private boolean eof = false;

    private boolean closed = false;

    ExchangeImpl t;

    FixedLengthOutputStream (ExchangeImpl t, OutputStream src, long len) {

        super (src);

        this.t = t;

        this.remaining = len;

    }

    public void write (int b) throws IOException {

        if (closed) {

            throw new IOException ("stream closed");

        }

        eof = (remaining == 0);

        if (eof) {

            throw new StreamClosedException();

        }

        out.write(b);

        remaining --;

    }

    public void write (byte[]b, int off, int len) throws IOException {

        if (closed) {

            throw new IOException ("stream closed");

        }

        eof = (remaining == 0);

        if (eof) {

            throw new StreamClosedException();

        }

        if (len > remaining) {

            // stream is still open, caller can retry

            throw new IOException ("too many bytes to write to stream");

        }

        out.write(b, off, len);

        remaining -= len;

    }

    public void close () throws IOException {

        if (closed) {

            return;

        }

        closed = true;

        if (remaining > 0) {

            t.close();

            throw new IOException ("insufficient bytes written to stream");

        }

        flush();

        eof = true;

        LeftOverInputStream is = t.getOriginalInputStream();

        if (!is.isClosed()) {

            try {

                is.close();

            } catch (IOException e) {}

        }

        WriteFinishedEvent e = new WriteFinishedEvent (t);

        t.getHttpContext().getServerImpl().addEvent (e);

    }

    // flush is a pass-through

}