    001/*
    002 *  Licensed to the Apache Software Foundation (ASF) under one or more
    003 *  contributor license agreements.  See the NOTICE file distributed with
    004 *  this work for additional information regarding copyright ownership.
    005 *  The ASF licenses this file to You under the Apache License, Version 2.0
    006 *  (the "License"); you may not use this file except in compliance with
    007 *  the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 */
    017package org.apache.commons.compress.archivers.zip;
    018
    019import java.io.Closeable;
    020import java.io.File;
    021import java.io.FileNotFoundException;
    022import java.io.IOException;
    023import java.io.InputStream;
    024import java.nio.file.Path;
    025import java.util.Iterator;
    026import java.util.Queue;
    027import java.util.concurrent.ConcurrentLinkedQueue;
    028import java.util.concurrent.atomic.AtomicBoolean;
    029import java.util.zip.Deflater;
    030
    031import org.apache.commons.compress.parallel.FileBasedScatterGatherBackingStore;
    032import org.apache.commons.compress.parallel.ScatterGatherBackingStore;
    033import org.apache.commons.compress.utils.BoundedInputStream;
    034
    035/**
    036 * A ZIP output stream that is optimized for multi-threaded scatter/gather construction of ZIP files.
    037 * <p>
    038 * The internal data format of the entries used by this class are entirely private to this class and are not part of any public api whatsoever.
    039 * </p>
    040 * <p>
    041 * It is possible to extend this class to support different kinds of backing storage, the default implementation only supports file-based backing.
    042 * </p>
    043 * <p>
    044 * Thread safety: This class supports multiple threads. But the "writeTo" method must be called by the thread that originally created the
    045 * {@link ZipArchiveEntry}.
    046 * </p>
    047 *
    048 * @since 1.10
    049 */
    050public class ScatterZipOutputStream implements Closeable {
    051
    052    private static final class CompressedEntry {
    053        final ZipArchiveEntryRequest zipArchiveEntryRequest;
    054        final long crc;
    055        final long compressedSize;
    056        final long size;
    057
    058        CompressedEntry(final ZipArchiveEntryRequest zipArchiveEntryRequest, final long crc, final long compressedSize, final long size) {
    059            this.zipArchiveEntryRequest = zipArchiveEntryRequest;
    060            this.crc = crc;
    061            this.compressedSize = compressedSize;
    062            this.size = size;
    063        }
    064
    065        /**
    066         * Updates the original {@link ZipArchiveEntry} with sizes/crc. Do not use this method from threads that did not create the instance itself!
    067         *
    068         * @return the zipArchiveEntry that is the basis for this request.
    069         */
    070
    071        public ZipArchiveEntry transferToArchiveEntry() {
    072            final ZipArchiveEntry entry = zipArchiveEntryRequest.getZipArchiveEntry();
    073            entry.setCompressedSize(compressedSize);
    074            entry.setSize(size);
    075            entry.setCrc(crc);
    076            entry.setMethod(zipArchiveEntryRequest.getMethod());
    077            return entry;
    078        }
    079    }
    080
    081    public static class ZipEntryWriter implements Closeable {
    082        private final Iterator<CompressedEntry> itemsIterator;
    083        private final InputStream itemsIteratorData;
    084
    085        public ZipEntryWriter(final ScatterZipOutputStream scatter) throws IOException {
    086            scatter.backingStore.closeForWriting();
    087            itemsIterator = scatter.items.iterator();
    088            itemsIteratorData = scatter.backingStore.getInputStream();
    089        }
    090
    091        @Override
    092        public void close() throws IOException {
    093            if (itemsIteratorData != null) {
    094                itemsIteratorData.close();
    095            }
    096        }
    097
    098        public void writeNextZipEntry(final ZipArchiveOutputStream target) throws IOException {
    099            final CompressedEntry compressedEntry = itemsIterator.next();
    100            try (BoundedInputStream rawStream = new BoundedInputStream(itemsIteratorData, compressedEntry.compressedSize)) {
    101                target.addRawArchiveEntry(compressedEntry.transferToArchiveEntry(), rawStream);
    102            }
    103        }
    104    }
    105
    106    /**
    107     * Creates a {@link ScatterZipOutputStream} with default compression level that is backed by a file
    108     *
    109     * @param file The file to offload compressed data into.
    110     * @return A ScatterZipOutputStream that is ready for use.
    111     * @throws FileNotFoundException if the file cannot be found
    112     */
    113    public static ScatterZipOutputStream fileBased(final File file) throws FileNotFoundException {
    114        return pathBased(file.toPath(), Deflater.DEFAULT_COMPRESSION);
    115    }
    116
    117    /**
    118     * Creates a {@link ScatterZipOutputStream} that is backed by a file
    119     *
    120     * @param file             The file to offload compressed data into.
    121     * @param compressionLevel The compression level to use, @see #Deflater
    122     * @return A ScatterZipOutputStream that is ready for use.
    123     * @throws FileNotFoundException if the file cannot be found
    124     */
    125    public static ScatterZipOutputStream fileBased(final File file, final int compressionLevel) throws FileNotFoundException {
    126        return pathBased(file.toPath(), compressionLevel);
    127    }
    128
    129    /**
    130     * Creates a {@link ScatterZipOutputStream} with default compression level that is backed by a file
    131     *
    132     * @param path The path to offload compressed data into.
    133     * @return A ScatterZipOutputStream that is ready for use.
    134     * @throws FileNotFoundException if the path cannot be found
    135     * @since 1.22
    136     */
    137    public static ScatterZipOutputStream pathBased(final Path path) throws FileNotFoundException {
    138        return pathBased(path, Deflater.DEFAULT_COMPRESSION);
    139    }
    140
    141    /**
    142     * Creates a {@link ScatterZipOutputStream} that is backed by a file
    143     *
    144     * @param path             The path to offload compressed data into.
    145     * @param compressionLevel The compression level to use, @see #Deflater
    146     * @return A ScatterZipOutputStream that is ready for use.
    147     * @throws FileNotFoundException if the path cannot be found
    148     * @since 1.22
    149     */
    150    public static ScatterZipOutputStream pathBased(final Path path, final int compressionLevel) throws FileNotFoundException {
    151        final ScatterGatherBackingStore bs = new FileBasedScatterGatherBackingStore(path);
    152        // lifecycle is bound to the ScatterZipOutputStream returned
    153        final StreamCompressor sc = StreamCompressor.create(compressionLevel, bs); // NOSONAR
    154        return new ScatterZipOutputStream(bs, sc);
    155    }
    156
    157    private final Queue<CompressedEntry> items = new ConcurrentLinkedQueue<>();
    158
    159    private final ScatterGatherBackingStore backingStore;
    160
    161    private final StreamCompressor streamCompressor;
    162
    163    private final AtomicBoolean isClosed = new AtomicBoolean();
    164
    165    private ZipEntryWriter zipEntryWriter;
    166
    167    public ScatterZipOutputStream(final ScatterGatherBackingStore backingStore, final StreamCompressor streamCompressor) {
    168        this.backingStore = backingStore;
    169        this.streamCompressor = streamCompressor;
    170    }
    171
    172    /**
    173     * Adds an archive entry to this scatter stream.
    174     *
    175     * @param zipArchiveEntryRequest The entry to write.
    176     * @throws IOException If writing fails
    177     */
    178    public void addArchiveEntry(final ZipArchiveEntryRequest zipArchiveEntryRequest) throws IOException {
    179        try (InputStream payloadStream = zipArchiveEntryRequest.getPayloadStream()) {
    180            streamCompressor.deflate(payloadStream, zipArchiveEntryRequest.getMethod());
    181        }
    182        items.add(new CompressedEntry(zipArchiveEntryRequest, streamCompressor.getCrc32(), streamCompressor.getBytesWrittenForLastEntry(),
    183                streamCompressor.getBytesRead()));
    184    }
    185
    186    /**
    187     * Closes this stream, freeing all resources involved in the creation of this stream.
    188     *
    189     * @throws IOException If closing fails
    190     */
    191    @Override
    192    public void close() throws IOException {
    193        if (!isClosed.compareAndSet(false, true)) {
    194            return;
    195        }
    196        try {
    197            if (zipEntryWriter != null) {
    198                zipEntryWriter.close();
    199            }
    200            backingStore.close();
    201        } finally {
    202            streamCompressor.close();
    203        }
    204    }
    205
    206    /**
    207     * Writes the contents of this scatter stream to a target archive.
    208     *
    209     * @param target The archive to receive the contents of this {@link ScatterZipOutputStream}.
    210     * @throws IOException If writing fails
    211     * @see #zipEntryWriter()
    212     */
    213    public void writeTo(final ZipArchiveOutputStream target) throws IOException {
    214        backingStore.closeForWriting();
    215        try (InputStream data = backingStore.getInputStream()) {
    216            for (final CompressedEntry compressedEntry : items) {
    217                try (BoundedInputStream rawStream = new BoundedInputStream(data, compressedEntry.compressedSize)) {
    218                    target.addRawArchiveEntry(compressedEntry.transferToArchiveEntry(), rawStream);
    219                }
    220            }
    221        }
    222    }
    223
    224    /**
    225     * Gets a ZIP entry writer for this scatter stream.
    226     *
    227     * @throws IOException If getting scatter stream input stream
    228     * @return the ZipEntryWriter created on first call of the method
    229     */
    230    public ZipEntryWriter zipEntryWriter() throws IOException {
    231        if (zipEntryWriter == null) {
    232            zipEntryWriter = new ZipEntryWriter(this);
    233        }
    234        return zipEntryWriter;
    235    }
    236}