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- /*
- * Copyright (C) 2011, 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.storage.pack;
-
- import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
- import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
-
- import java.io.IOException;
- import java.util.List;
- import java.util.Set;
-
- import org.eclipse.jgit.errors.IncorrectObjectTypeException;
- import org.eclipse.jgit.errors.MissingObjectException;
- import org.eclipse.jgit.lib.AnyObjectId;
- import org.eclipse.jgit.lib.FileMode;
- import org.eclipse.jgit.lib.MutableObjectId;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.lib.ObjectIdSubclassMap;
- import org.eclipse.jgit.lib.ObjectLoader;
- import org.eclipse.jgit.lib.ObjectReader;
- import org.eclipse.jgit.lib.ProgressMonitor;
- import org.eclipse.jgit.revwalk.RevTree;
- import org.eclipse.jgit.treewalk.CanonicalTreeParser;
-
- class BaseSearch {
- private static final int M_BLOB = FileMode.REGULAR_FILE.getBits();
-
- private static final int M_TREE = FileMode.TREE.getBits();
-
- private final ProgressMonitor progress;
-
- private final ObjectReader reader;
-
- private final ObjectId[] baseTrees;
-
- private final ObjectIdSubclassMap<ObjectToPack> objectsMap;
-
- private final List<ObjectToPack> edgeObjects;
-
- private final IntSet alreadyProcessed;
-
- private final ObjectIdSubclassMap<TreeWithData> treeCache;
-
- private final CanonicalTreeParser parser;
-
- private final MutableObjectId idBuf;
-
- BaseSearch(ProgressMonitor countingMonitor, Set<RevTree> bases,
- ObjectIdSubclassMap<ObjectToPack> objects,
- List<ObjectToPack> edges, ObjectReader or) {
- progress = countingMonitor;
- reader = or;
- baseTrees = bases.toArray(new ObjectId[bases.size()]);
- objectsMap = objects;
- edgeObjects = edges;
-
- alreadyProcessed = new IntSet();
- treeCache = new ObjectIdSubclassMap<TreeWithData>();
- parser = new CanonicalTreeParser();
- idBuf = new MutableObjectId();
- }
-
- void addBase(int objectType, byte[] pathBuf, int pathLen, int pathHash)
- throws IOException {
- final int tailMode = modeForType(objectType);
- if (tailMode == 0)
- return;
-
- if (!alreadyProcessed.add(pathHash))
- return;
-
- if (pathLen == 0) {
- for (ObjectId root : baseTrees)
- add(root, OBJ_TREE, pathHash);
- return;
- }
-
- final int firstSlash = nextSlash(pathBuf, 0, pathLen);
-
- CHECK_BASE: for (ObjectId root : baseTrees) {
- int ptr = 0;
- int end = firstSlash;
- int mode = end != pathLen ? M_TREE : tailMode;
-
- parser.reset(readTree(root));
- while (!parser.eof()) {
- int cmp = parser.pathCompare(pathBuf, ptr, end, mode);
-
- if (cmp < 0) {
- parser.next();
- continue;
- }
-
- if (cmp > 0)
- continue CHECK_BASE;
-
- if (end == pathLen) {
- if (parser.getEntryFileMode().getObjectType() == objectType) {
- idBuf.fromRaw(parser.idBuffer(), parser.idOffset());
- add(idBuf, objectType, pathHash);
- }
- continue CHECK_BASE;
- }
-
- if (!FileMode.TREE.equals(parser.getEntryRawMode()))
- continue CHECK_BASE;
-
- ptr = end + 1;
- end = nextSlash(pathBuf, ptr, pathLen);
- mode = end != pathLen ? M_TREE : tailMode;
-
- idBuf.fromRaw(parser.idBuffer(), parser.idOffset());
- parser.reset(readTree(idBuf));
- }
- }
- }
-
- private static int modeForType(int typeCode) {
- switch (typeCode) {
- case OBJ_TREE:
- return M_TREE;
-
- case OBJ_BLOB:
- return M_BLOB;
-
- default:
- return 0;
- }
- }
-
- private static int nextSlash(byte[] pathBuf, int ptr, int end) {
- while (ptr < end && pathBuf[ptr] != '/')
- ptr++;
- return ptr;
- }
-
- private void add(AnyObjectId id, int objectType, int pathHash) {
- ObjectToPack obj = new ObjectToPack(id, objectType);
- obj.setEdge();
- obj.setPathHash(pathHash);
-
- if (objectsMap.addIfAbsent(obj) == obj) {
- edgeObjects.add(obj);
- progress.update(1);
- }
- }
-
- private byte[] readTree(AnyObjectId id) throws MissingObjectException,
- IncorrectObjectTypeException, IOException {
- TreeWithData tree = treeCache.get(id);
- if (tree != null)
- return tree.buf;
-
- ObjectLoader ldr = reader.open(id, OBJ_TREE);
- byte[] buf = ldr.getCachedBytes(Integer.MAX_VALUE);
- treeCache.add(new TreeWithData(id, buf));
- return buf;
- }
-
- private static class TreeWithData extends ObjectId {
- final byte[] buf;
-
- TreeWithData(AnyObjectId id, byte[] buf) {
- super(id);
- this.buf = buf;
- }
- }
- }
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