| /* |
| * Copyright (C) 2008-2010, Google Inc. |
| * Copyright (C) 2008-2009, Robin Rosenberg <robin.rosenberg@dewire.com> |
| * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> |
| * 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 org.eclipse.jgit.lib.Constants; |
| |
| /** |
| * Write Git style pkt-line formatting to an output stream. |
| * <p> |
| * This class is not thread safe and may issue multiple writes to the underlying |
| * stream for each method call made. |
| * <p> |
| * This class performs no buffering on its own. This makes it suitable to |
| * interleave writes performed by this class with writes performed directly |
| * against the underlying OutputStream. |
| */ |
| public class PacketLineOut { |
| private final OutputStream out; |
| |
| private final byte[] lenbuffer; |
| |
| private boolean flushOnEnd; |
| |
| /** |
| * Create a new packet line writer. |
| * |
| * @param outputStream |
| * stream. |
| */ |
| public PacketLineOut(final OutputStream outputStream) { |
| out = outputStream; |
| lenbuffer = new byte[5]; |
| flushOnEnd = true; |
| } |
| |
| /** |
| * Set the flush behavior during {@link #end()}. |
| * |
| * @param flushOnEnd |
| * if true, a flush-pkt written during {@link #end()} also |
| * flushes the underlying stream. |
| */ |
| public void setFlushOnEnd(boolean flushOnEnd) { |
| this.flushOnEnd = flushOnEnd; |
| } |
| |
| /** |
| * Write a UTF-8 encoded string as a single length-delimited packet. |
| * |
| * @param s |
| * string to write. |
| * @throws IOException |
| * the packet could not be written, the stream is corrupted as |
| * the packet may have been only partially written. |
| */ |
| public void writeString(final String s) throws IOException { |
| writePacket(Constants.encode(s)); |
| } |
| |
| /** |
| * Write a binary packet to the stream. |
| * |
| * @param packet |
| * the packet to write; the length of the packet is equal to the |
| * size of the byte array. |
| * @throws IOException |
| * the packet could not be written, the stream is corrupted as |
| * the packet may have been only partially written. |
| */ |
| public void writePacket(final byte[] packet) throws IOException { |
| formatLength(packet.length + 4); |
| out.write(lenbuffer, 0, 4); |
| out.write(packet); |
| } |
| |
| /** |
| * Write a packet end marker, sometimes referred to as a flush command. |
| * <p> |
| * Technically this is a magical packet type which can be detected |
| * separately from an empty string or an empty packet. |
| * <p> |
| * Implicitly performs a flush on the underlying OutputStream to ensure the |
| * peer will receive all data written thus far. |
| * |
| * @throws IOException |
| * the end marker could not be written, the stream is corrupted |
| * as the end marker may have been only partially written. |
| */ |
| public void end() throws IOException { |
| formatLength(0); |
| out.write(lenbuffer, 0, 4); |
| if (flushOnEnd) |
| flush(); |
| } |
| |
| /** |
| * Flush the underlying OutputStream. |
| * <p> |
| * Performs a flush on the underlying OutputStream to ensure the peer will |
| * receive all data written thus far. |
| * |
| * @throws IOException |
| * the underlying stream failed to flush. |
| */ |
| public void flush() throws IOException { |
| out.flush(); |
| } |
| |
| private static final byte[] hexchar = { '0', '1', '2', '3', '4', '5', '6', |
| '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; |
| |
| private void formatLength(int w) { |
| formatLength(lenbuffer, w); |
| } |
| |
| static void formatLength(byte[] lenbuffer, int w) { |
| int o = 3; |
| while (o >= 0 && w != 0) { |
| lenbuffer[o--] = hexchar[w & 0xf]; |
| w >>>= 4; |
| } |
| while (o >= 0) |
| lenbuffer[o--] = '0'; |
| } |
| } |