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/*
* Copyright (C) 2008, Google Inc.
* Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
* 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.patch;
import static org.eclipse.jgit.lib.Constants.encodeASCII;
import static org.eclipse.jgit.util.RawParseUtils.match;
import static org.eclipse.jgit.util.RawParseUtils.nextLF;
import static org.eclipse.jgit.util.RawParseUtils.parseBase10;
/**
* Part of a "GIT binary patch" to describe the pre-image or post-image
*/
public class BinaryHunk {
private static final byte[] LITERAL = encodeASCII("literal "); //$NON-NLS-1$
private static final byte[] DELTA = encodeASCII("delta "); //$NON-NLS-1$
/** Type of information stored in a binary hunk. */
public static enum Type {
/** The full content is stored, deflated. */
LITERAL_DEFLATED,
/** A Git pack-style delta is stored, deflated. */
DELTA_DEFLATED;
}
private final FileHeader file;
/** Offset within {@link #file}.buf to the "literal" or "delta " line. */
final int startOffset;
/** Position 1 past the end of this hunk within {@link #file}'s buf. */
int endOffset;
/** Type of the data meaning. */
private Type type;
/** Inflated length of the data. */
private int length;
BinaryHunk(final FileHeader fh, final int offset) {
file = fh;
startOffset = offset;
}
/**
* Get header for the file this hunk applies to.
*
* @return header for the file this hunk applies to.
*/
public FileHeader getFileHeader() {
return file;
}
/**
* Get the byte array holding this hunk's patch script.
*
* @return the byte array holding this hunk's patch script.
*/
public byte[] getBuffer() {
return file.buf;
}
/**
* Get offset the start of this hunk in {@link #getBuffer()}.
*
* @return offset the start of this hunk in {@link #getBuffer()}.
*/
public int getStartOffset() {
return startOffset;
}
/**
* Get offset one past the end of the hunk in {@link #getBuffer()}.
*
* @return offset one past the end of the hunk in {@link #getBuffer()}.
*/
public int getEndOffset() {
return endOffset;
}
/**
* Get type of this binary hunk.
*
* @return type of this binary hunk.
*/
public Type getType() {
return type;
}
/**
* Get inflated size of this hunk's data.
*
* @return inflated size of this hunk's data.
*/
public int getSize() {
return length;
}
int parseHunk(int ptr, final int end) {
final byte[] buf = file.buf;
if (match(buf, ptr, LITERAL) >= 0) {
type = Type.LITERAL_DEFLATED;
length = parseBase10(buf, ptr + LITERAL.length, null);
} else if (match(buf, ptr, DELTA) >= 0) {
type = Type.DELTA_DEFLATED;
length = parseBase10(buf, ptr + DELTA.length, null);
} else {
// Not a valid binary hunk. Signal to the caller that
// we cannot parse any further and that this line should
// be treated otherwise.
//
return -1;
}
ptr = nextLF(buf, ptr);
// Skip until the first blank line; that is the end of the binary
// encoded information in this hunk. To save time we don't do a
// validation of the binary data at this point.
//
while (ptr < end) {
final boolean empty = buf[ptr] == '\n';
ptr = nextLF(buf, ptr);
if (empty)
break;
}
return ptr;
}
}
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