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- /*
- * 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.InputStream;
-
- import org.eclipse.jgit.errors.PackProtocolException;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.MutableObjectId;
- import org.eclipse.jgit.util.IO;
- import org.eclipse.jgit.util.RawParseUtils;
-
- class PacketLineIn {
- static final String END = new String("") /* must not string pool */;
-
- static enum AckNackResult {
- /** NAK */
- NAK,
- /** ACK */
- ACK,
- /** ACK + continue */
- ACK_CONTINUE,
- /** ACK + common */
- ACK_COMMON,
- /** ACK + ready */
- ACK_READY;
- }
-
- private final InputStream in;
-
- private final byte[] lineBuffer;
-
- PacketLineIn(final InputStream i) {
- in = i;
- lineBuffer = new byte[SideBandOutputStream.SMALL_BUF];
- }
-
- AckNackResult readACK(final MutableObjectId returnedId) throws IOException {
- final String line = readString();
- if (line.length() == 0)
- throw new PackProtocolException("Expected ACK/NAK, found EOF");
- if ("NAK".equals(line))
- return AckNackResult.NAK;
- if (line.startsWith("ACK ")) {
- returnedId.fromString(line.substring(4, 44));
- if (line.length() == 44)
- return AckNackResult.ACK;
-
- final String arg = line.substring(44);
- if (arg.equals(" continue"))
- return AckNackResult.ACK_CONTINUE;
- else if (arg.equals(" common"))
- return AckNackResult.ACK_COMMON;
- else if (arg.equals(" ready"))
- return AckNackResult.ACK_READY;
- }
- throw new PackProtocolException("Expected ACK/NAK, got: " + line);
- }
-
- String readString() throws IOException {
- int len = readLength();
- if (len == 0)
- return END;
-
- len -= 4; // length header (4 bytes)
- if (len == 0)
- return "";
-
- final byte[] raw = new byte[len];
- IO.readFully(in, raw, 0, len);
- if (raw[len - 1] == '\n')
- len--;
- return RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
- }
-
- String readStringRaw() throws IOException {
- int len = readLength();
- if (len == 0)
- return END;
-
- len -= 4; // length header (4 bytes)
-
- byte[] raw;
- if (len <= lineBuffer.length)
- raw = lineBuffer;
- else
- raw = new byte[len];
-
- IO.readFully(in, raw, 0, len);
- return RawParseUtils.decode(Constants.CHARSET, raw, 0, len);
- }
-
- int readLength() throws IOException {
- IO.readFully(in, lineBuffer, 0, 4);
- try {
- final int len = RawParseUtils.parseHexInt16(lineBuffer, 0);
- if (len != 0 && len < 4)
- throw new ArrayIndexOutOfBoundsException();
- return len;
- } catch (ArrayIndexOutOfBoundsException err) {
- throw new IOException("Invalid packet line header: "
- + (char) lineBuffer[0] + (char) lineBuffer[1]
- + (char) lineBuffer[2] + (char) lineBuffer[3]);
- }
- }
- }
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