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- /*
- * Copyright (C) 2008-2010, Google Inc.
- * and other copyright owners as documented in the project's IP log.
- *
- * This program and the accompanying materials are made available
- * under the terms of the Eclipse Distribution License v1.0 which
- * accompanies this distribution, is reproduced below, and is
- * available at http://www.eclipse.org/org/documents/edl-v10.php
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or
- * without modification, are permitted provided that the following
- * conditions are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following
- * disclaimer in the documentation and/or other materials provided
- * with the distribution.
- *
- * - Neither the name of the Eclipse Foundation, Inc. nor the
- * names of its contributors may be used to endorse or promote
- * products derived from this software without specific prior
- * written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
- * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
- package org.eclipse.jgit.transport;
-
- import java.io.IOException;
- import java.io.OutputStream;
- import java.text.MessageFormat;
-
- import org.eclipse.jgit.JGitText;
-
- /**
- * Multiplexes data and progress messages.
- * <p>
- * This stream is buffered at packet sizes, so the caller doesn't need to wrap
- * it in yet another buffered stream.
- */
- class SideBandOutputStream extends OutputStream {
- static final int CH_DATA = SideBandInputStream.CH_DATA;
-
- static final int CH_PROGRESS = SideBandInputStream.CH_PROGRESS;
-
- static final int CH_ERROR = SideBandInputStream.CH_ERROR;
-
- static final int SMALL_BUF = 1000;
-
- static final int MAX_BUF = 65520;
-
- static final int HDR_SIZE = 5;
-
- private final OutputStream out;
-
- private final byte[] buffer;
-
- /**
- * Number of bytes in {@link #buffer} that are valid data.
- * <p>
- * Initialized to {@link #HDR_SIZE} if there is no application data in the
- * buffer, as the packet header always appears at the start of the buffer.
- */
- private int cnt;
-
- /**
- * Create a new stream to write side band packets.
- *
- * @param chan
- * channel number to prefix all packets with, so the remote side
- * can demultiplex the stream and get back the original data.
- * Must be in the range [0, 255].
- * @param sz
- * maximum size of a data packet within the stream. The remote
- * side needs to agree to the packet size to prevent buffer
- * overflows. Must be in the range [HDR_SIZE + 1, MAX_BUF).
- * @param os
- * stream that the packets are written onto. This stream should
- * be attached to a SideBandInputStream on the remote side.
- */
- SideBandOutputStream(final int chan, final int sz, final OutputStream os) {
- if (chan <= 0 || chan > 255)
- throw new IllegalArgumentException(MessageFormat.format(JGitText.get().channelMustBeInRange0_255, chan));
- if (sz <= HDR_SIZE)
- throw new IllegalArgumentException(MessageFormat.format(JGitText.get().packetSizeMustBeAtLeast, sz, HDR_SIZE));
- else if (MAX_BUF < sz)
- throw new IllegalArgumentException(MessageFormat.format(JGitText.get().packetSizeMustBeAtMost, sz, MAX_BUF));
-
- out = os;
- buffer = new byte[sz];
- buffer[4] = (byte) chan;
- cnt = HDR_SIZE;
- }
-
- @Override
- public void flush() throws IOException {
- if (HDR_SIZE < cnt)
- writeBuffer();
- out.flush();
- }
-
- @Override
- public void write(final byte[] b, int off, int len) throws IOException {
- while (0 < len) {
- int capacity = buffer.length - cnt;
- if (cnt == HDR_SIZE && capacity < len) {
- // Our block to write is bigger than the packet size,
- // stream it out as-is to avoid unnecessary copies.
- PacketLineOut.formatLength(buffer, buffer.length);
- out.write(buffer, 0, HDR_SIZE);
- out.write(b, off, capacity);
- off += capacity;
- len -= capacity;
-
- } else {
- if (capacity == 0)
- writeBuffer();
-
- int n = Math.min(len, capacity);
- System.arraycopy(b, off, buffer, cnt, n);
- cnt += n;
- off += n;
- len -= n;
- }
- }
- }
-
- @Override
- public void write(final int b) throws IOException {
- if (cnt == buffer.length)
- writeBuffer();
- buffer[cnt++] = (byte) b;
- }
-
- private void writeBuffer() throws IOException {
- PacketLineOut.formatLength(buffer, cnt);
- out.write(buffer, 0, cnt);
- cnt = HDR_SIZE;
- }
- }
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