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104 lines
3.5 KiB
104 lines
3.5 KiB
/* |
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* Copyright (C) 2010, Google Inc. and others |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the Eclipse Distribution License v. 1.0 which is available at |
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* https://www.eclipse.org/org/documents/edl-v10.php. |
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* |
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* SPDX-License-Identifier: BSD-3-Clause |
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*/ |
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package org.eclipse.jgit.pgm.debug; |
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import java.io.ByteArrayInputStream; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.util.Collections; |
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import java.util.zip.InflaterInputStream; |
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import org.eclipse.jgit.errors.MissingObjectException; |
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import org.eclipse.jgit.errors.StoredObjectRepresentationNotAvailableException; |
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import org.eclipse.jgit.internal.storage.pack.BinaryDelta; |
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import org.eclipse.jgit.internal.storage.pack.ObjectReuseAsIs; |
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import org.eclipse.jgit.internal.storage.pack.ObjectToPack; |
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import org.eclipse.jgit.internal.storage.pack.PackOutputStream; |
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import org.eclipse.jgit.internal.storage.pack.PackWriter; |
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import org.eclipse.jgit.internal.storage.pack.StoredObjectRepresentation; |
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import org.eclipse.jgit.lib.NullProgressMonitor; |
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import org.eclipse.jgit.lib.ObjectId; |
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import org.eclipse.jgit.lib.ObjectReader; |
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import org.eclipse.jgit.pgm.Command; |
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import org.eclipse.jgit.pgm.TextBuiltin; |
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import org.eclipse.jgit.revwalk.RevObject; |
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import org.eclipse.jgit.revwalk.RevWalk; |
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import org.eclipse.jgit.util.TemporaryBuffer; |
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import org.kohsuke.args4j.Argument; |
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@Command(usage = "usage_ShowPackDelta") |
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class ShowPackDelta extends TextBuiltin { |
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@Argument(index = 0) |
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private ObjectId objectId; |
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/** {@inheritDoc} */ |
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@Override |
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protected void run() throws Exception { |
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ObjectReader reader = db.newObjectReader(); |
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RevObject obj; |
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try (RevWalk rw = new RevWalk(reader)) { |
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obj = rw.parseAny(objectId); |
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} |
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byte[] delta = getDelta(reader, obj); |
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// We're crossing our fingers that this will be a delta. Double |
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// check the size field in the header, it should match. |
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// |
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long size = reader.getObjectSize(obj, obj.getType()); |
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try { |
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if (BinaryDelta.getResultSize(delta) != size) |
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throw die("Object " + obj.name() + " is not a delta"); //$NON-NLS-1$ //$NON-NLS-2$ |
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} catch (ArrayIndexOutOfBoundsException bad) { |
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throw die("Object " + obj.name() + " is not a delta", bad); //$NON-NLS-1$ //$NON-NLS-2$ |
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} |
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outw.println(BinaryDelta.format(delta)); |
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} |
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private static byte[] getDelta(ObjectReader reader, RevObject obj) |
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throws IOException, MissingObjectException, |
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StoredObjectRepresentationNotAvailableException { |
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ObjectReuseAsIs asis = (ObjectReuseAsIs) reader; |
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ObjectToPack target = asis.newObjectToPack(obj, obj.getType()); |
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PackWriter pw = new PackWriter(reader) { |
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@Override |
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public void select(ObjectToPack otp, StoredObjectRepresentation next) { |
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otp.select(next); |
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} |
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}; |
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ByteArrayOutputStream buf = new ByteArrayOutputStream(); |
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asis.selectObjectRepresentation(pw, NullProgressMonitor.INSTANCE, |
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Collections.singleton(target)); |
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asis.copyObjectAsIs(new PackOutputStream(NullProgressMonitor.INSTANCE, |
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buf, pw), target, true); |
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// At this point the object header has no delta information, |
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// because it was output as though it were a whole object. |
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// Skip over the header and inflate. |
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// |
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byte[] bufArray = buf.toByteArray(); |
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int ptr = 0; |
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while ((bufArray[ptr] & 0x80) != 0) |
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ptr++; |
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ptr++; |
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try (TemporaryBuffer.Heap raw = new TemporaryBuffer.Heap( |
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bufArray.length); |
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InflaterInputStream inf = new InflaterInputStream( |
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new ByteArrayInputStream(bufArray, ptr, |
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bufArray.length))) { |
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raw.copy(inf); |
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return raw.toByteArray(); |
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} |
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} |
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}
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