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- /*
- * Copyright (C) 2008, 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.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 java.nio.charset.Charset;
- import java.util.ArrayList;
- import java.util.Arrays;
- import java.util.List;
-
- import org.eclipse.jgit.lib.AbbreviatedObjectId;
- import org.eclipse.jgit.lib.FileMode;
-
- /**
- * A file in the Git "diff --cc" or "diff --combined" format.
- * <p>
- * A combined diff shows an n-way comparison between two or more ancestors and
- * the final revision. Its primary function is to perform code reviews on a
- * merge which introduces changes not in any ancestor.
- */
- public class CombinedFileHeader extends FileHeader {
- private static final byte[] MODE = encodeASCII("mode "); //$NON-NLS-1$
-
- private AbbreviatedObjectId[] oldIds;
-
- private FileMode[] oldModes;
-
- CombinedFileHeader(byte[] b, int offset) {
- super(b, offset);
- }
-
- /** {@inheritDoc} */
- @Override
- @SuppressWarnings("unchecked")
- public List<? extends CombinedHunkHeader> getHunks() {
- return (List<CombinedHunkHeader>) super.getHunks();
- }
-
- /**
- * {@inheritDoc}
- * <p>
- *
- * @return number of ancestor revisions mentioned in this diff.
- */
- @Override
- public int getParentCount() {
- return oldIds.length;
- }
-
- /**
- * {@inheritDoc}
- * <p>
- * @return get the file mode of the first parent.
- */
- @Override
- public FileMode getOldMode() {
- return getOldMode(0);
- }
-
- /**
- * Get the file mode of the nth ancestor
- *
- * @param nthParent
- * the ancestor to get the mode of
- * @return the mode of the requested ancestor.
- */
- public FileMode getOldMode(int nthParent) {
- return oldModes[nthParent];
- }
-
- /**
- * {@inheritDoc}
- * <p>
- *
- * @return get the object id of the first parent.
- */
- @Override
- public AbbreviatedObjectId getOldId() {
- return getOldId(0);
- }
-
- /**
- * Get the ObjectId of the nth ancestor
- *
- * @param nthParent
- * the ancestor to get the object id of
- * @return the id of the requested ancestor.
- */
- public AbbreviatedObjectId getOldId(int nthParent) {
- return oldIds[nthParent];
- }
-
- /** {@inheritDoc} */
- @Override
- public String getScriptText(Charset ocs, Charset ncs) {
- final Charset[] cs = new Charset[getParentCount() + 1];
- Arrays.fill(cs, ocs);
- cs[getParentCount()] = ncs;
- return getScriptText(cs);
- }
-
- /**
- * {@inheritDoc}
- * <p>
- * Convert the patch script for this file into a string.
- */
- @Override
- public String getScriptText(Charset[] charsetGuess) {
- return super.getScriptText(charsetGuess);
- }
-
- @Override
- int parseGitHeaders(int ptr, int end) {
- while (ptr < end) {
- final int eol = nextLF(buf, ptr);
- if (isHunkHdr(buf, ptr, end) >= 1) {
- // First hunk header; break out and parse them later.
- break;
-
- } else if (match(buf, ptr, OLD_NAME) >= 0) {
- parseOldName(ptr, eol);
-
- } else if (match(buf, ptr, NEW_NAME) >= 0) {
- parseNewName(ptr, eol);
-
- } else if (match(buf, ptr, INDEX) >= 0) {
- parseIndexLine(ptr + INDEX.length, eol);
-
- } else if (match(buf, ptr, MODE) >= 0) {
- parseModeLine(ptr + MODE.length, eol);
-
- } else if (match(buf, ptr, NEW_FILE_MODE) >= 0) {
- parseNewFileMode(ptr, eol);
-
- } else if (match(buf, ptr, DELETED_FILE_MODE) >= 0) {
- parseDeletedFileMode(ptr + DELETED_FILE_MODE.length, eol);
-
- } else {
- // Probably an empty patch (stat dirty).
- break;
- }
-
- ptr = eol;
- }
- return ptr;
- }
-
- /** {@inheritDoc} */
- @Override
- protected void parseIndexLine(int ptr, int eol) {
- // "index $asha1,$bsha1..$csha1"
- //
- final List<AbbreviatedObjectId> ids = new ArrayList<>();
- while (ptr < eol) {
- final int comma = nextLF(buf, ptr, ',');
- if (eol <= comma)
- break;
- ids.add(AbbreviatedObjectId.fromString(buf, ptr, comma - 1));
- ptr = comma;
- }
-
- oldIds = new AbbreviatedObjectId[ids.size() + 1];
- ids.toArray(oldIds);
- final int dot2 = nextLF(buf, ptr, '.');
- oldIds[ids.size()] = AbbreviatedObjectId.fromString(buf, ptr, dot2 - 1);
- newId = AbbreviatedObjectId.fromString(buf, dot2 + 1, eol - 1);
- oldModes = new FileMode[oldIds.length];
- }
-
- /** {@inheritDoc} */
- @Override
- protected void parseNewFileMode(int ptr, int eol) {
- for (int i = 0; i < oldModes.length; i++)
- oldModes[i] = FileMode.MISSING;
- super.parseNewFileMode(ptr, eol);
- }
-
- @Override
- HunkHeader newHunkHeader(int offset) {
- return new CombinedHunkHeader(this, offset);
- }
-
- private void parseModeLine(int ptr, int eol) {
- // "mode $amode,$bmode..$cmode"
- //
- int n = 0;
- while (ptr < eol) {
- final int comma = nextLF(buf, ptr, ',');
- if (eol <= comma)
- break;
- oldModes[n++] = parseFileMode(ptr, comma);
- ptr = comma;
- }
- final int dot2 = nextLF(buf, ptr, '.');
- oldModes[n] = parseFileMode(ptr, dot2);
- newMode = parseFileMode(dot2 + 1, eol);
- }
-
- private void parseDeletedFileMode(int ptr, int eol) {
- // "deleted file mode $amode,$bmode"
- //
- changeType = ChangeType.DELETE;
- int n = 0;
- while (ptr < eol) {
- final int comma = nextLF(buf, ptr, ',');
- if (eol <= comma)
- break;
- oldModes[n++] = parseFileMode(ptr, comma);
- ptr = comma;
- }
- oldModes[n] = parseFileMode(ptr, eol);
- newMode = FileMode.MISSING;
- }
- }
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