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- /*
- * Copyright (C) 2012, 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.internal.storage.file;
-
- import java.io.BufferedOutputStream;
- import java.io.DataOutput;
- import java.io.IOException;
- import java.io.OutputStream;
- import java.security.DigestOutputStream;
- import java.text.MessageFormat;
-
- import org.eclipse.jgit.internal.JGitText;
- import org.eclipse.jgit.internal.storage.file.PackBitmapIndexBuilder.StoredEntry;
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.util.io.SafeBufferedOutputStream;
-
- import com.googlecode.javaewah.EWAHCompressedBitmap;
-
- /**
- * Creates the version 1 pack bitmap index files.
- *
- * @see PackBitmapIndexV1
- */
- public class PackBitmapIndexWriterV1 {
- private final DigestOutputStream out;
- private final DataOutput dataOutput;
-
- /**
- * Creates the version 1 pack bitmap index files.
- *
- * @param dst
- * the output stream to which the index will be written.
- */
- public PackBitmapIndexWriterV1(final OutputStream dst) {
- out = new DigestOutputStream(dst instanceof BufferedOutputStream ? dst
- : new SafeBufferedOutputStream(dst),
- Constants.newMessageDigest());
- dataOutput = new SimpleDataOutput(out);
- }
-
- /**
- * Write all object entries to the index stream.
- * <p>
- * After writing the stream passed to the factory is flushed but remains
- * open. Callers are always responsible for closing the output stream.
- *
- * @param bitmaps
- * the index data for the bitmaps
- * @param packDataChecksum
- * checksum signature of the entire pack data content. This is
- * traditionally the last 20 bytes of the pack file's own stream.
- * @throws IOException
- * an error occurred while writing to the output stream, or this
- * index format cannot store the object data supplied.
- */
- public void write(PackBitmapIndexBuilder bitmaps, byte[] packDataChecksum)
- throws IOException {
- if (bitmaps == null || packDataChecksum.length != 20)
- throw new IllegalStateException();
-
- writeHeader(bitmaps.getOptions(), bitmaps.getBitmapCount(),
- packDataChecksum);
- writeBody(bitmaps);
- writeFooter();
-
- out.flush();
- }
-
- private void writeHeader(
- int options, int bitmapCount, byte[] packDataChecksum)
- throws IOException {
- out.write(PackBitmapIndexV1.MAGIC);
- dataOutput.writeShort(1);
- dataOutput.writeShort(options);
- dataOutput.writeInt(bitmapCount);
- out.write(packDataChecksum);
- }
-
- private void writeBody(PackBitmapIndexBuilder bitmaps) throws IOException {
- writeBitmap(bitmaps.getCommits());
- writeBitmap(bitmaps.getTrees());
- writeBitmap(bitmaps.getBlobs());
- writeBitmap(bitmaps.getTags());
- writeBitmaps(bitmaps);
- }
-
- private void writeBitmap(EWAHCompressedBitmap bitmap) throws IOException {
- bitmap.serialize(dataOutput);
- }
-
- private void writeBitmaps(PackBitmapIndexBuilder bitmaps)
- throws IOException {
- int bitmapCount = 0;
- for (StoredEntry entry : bitmaps.getCompressedBitmaps()) {
- writeBitmapEntry(entry);
- bitmapCount++;
- }
-
- int expectedBitmapCount = bitmaps.getBitmapCount();
- if (expectedBitmapCount != bitmapCount)
- throw new IOException(MessageFormat.format(
- JGitText.get().expectedGot,
- String.valueOf(expectedBitmapCount),
- String.valueOf(bitmapCount)));
- }
-
- private void writeBitmapEntry(StoredEntry entry) throws IOException {
- // Write object, XOR offset, and bitmap
- dataOutput.writeInt((int) entry.getObjectId());
- out.write(entry.getXorOffset());
- out.write(entry.getFlags());
- writeBitmap(entry.getBitmap());
- }
-
- private void writeFooter() throws IOException {
- out.on(false);
- out.write(out.getMessageDigest().digest());
- }
- }
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