    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.harmony.pack200;
    018
    019import java.io.BufferedOutputStream;
    020import java.io.IOException;
    021import java.io.OutputStream;
    022import java.util.ArrayList;
    023import java.util.List;
    024import java.util.jar.JarEntry;
    025import java.util.jar.JarFile;
    026import java.util.jar.JarInputStream;
    027import java.util.zip.GZIPOutputStream;
    028import java.util.zip.ZipEntry;
    029
    030/**
    031 * Archive is the main entry point to pack200 and represents a packed archive. An archive is constructed with either a JarInputStream and an output stream or a
    032 * JarFile as input and an OutputStream. Options can be set, then {@code pack()} is called, to pack the Jar file into a pack200 archive.
    033 */
    034public class Archive {
    035
    036    static class PackingFile {
    037
    038        private final String name;
    039        private byte[] contents;
    040        private final long modtime;
    041        private final boolean deflateHint;
    042        private final boolean isDirectory;
    043
    044        PackingFile(final byte[] bytes, final JarEntry jarEntry) {
    045            name = jarEntry.getName();
    046            contents = bytes;
    047            modtime = jarEntry.getTime();
    048            deflateHint = jarEntry.getMethod() == ZipEntry.DEFLATED;
    049            isDirectory = jarEntry.isDirectory();
    050        }
    051
    052        PackingFile(final String name, final byte[] contents, final long modtime) {
    053            this.name = name;
    054            this.contents = contents;
    055            this.modtime = modtime;
    056            deflateHint = false;
    057            isDirectory = false;
    058        }
    059
    060        public byte[] getContents() {
    061            return contents;
    062        }
    063
    064        public long getModtime() {
    065            return modtime;
    066        }
    067
    068        public String getName() {
    069            return name;
    070        }
    071
    072        public boolean isDefalteHint() {
    073            return deflateHint;
    074        }
    075
    076        public boolean isDirectory() {
    077            return isDirectory;
    078        }
    079
    080        public void setContents(final byte[] contents) {
    081            this.contents = contents;
    082        }
    083
    084        @Override
    085        public String toString() {
    086            return name;
    087        }
    088    }
    089
    090    static class SegmentUnit {
    091
    092        private final List<Pack200ClassReader> classList;
    093
    094        private final List<PackingFile> fileList;
    095
    096        private int byteAmount;
    097
    098        private int packedByteAmount;
    099
    100        SegmentUnit(final List<Pack200ClassReader> classes, final List<PackingFile> files) {
    101            classList = classes;
    102            fileList = files;
    103            byteAmount = 0;
    104            // Calculate the amount of bytes in classes and files before packing
    105            byteAmount += classList.stream().mapToInt(element -> element.b.length).sum();
    106            byteAmount += fileList.stream().mapToInt(element -> element.contents.length).sum();
    107        }
    108
    109        public void addPackedByteAmount(final int amount) {
    110            packedByteAmount += amount;
    111        }
    112
    113        public int classListSize() {
    114            return classList.size();
    115        }
    116
    117        public int fileListSize() {
    118            return fileList.size();
    119        }
    120
    121        public int getByteAmount() {
    122            return byteAmount;
    123        }
    124
    125        public List<Pack200ClassReader> getClassList() {
    126            return classList;
    127        }
    128
    129        public List<PackingFile> getFileList() {
    130            return fileList;
    131        }
    132
    133        public int getPackedByteAmount() {
    134            return packedByteAmount;
    135        }
    136    }
    137
    138    private static final byte[] EMPTY_BYTE_ARRAY = {};
    139
    140    private final JarInputStream jarInputStream;
    141    private final OutputStream outputStream;
    142    private JarFile jarFile;
    143
    144    private long currentSegmentSize;
    145
    146    private final PackingOptions options;
    147
    148    /**
    149     * Creates an Archive with the given input file and a stream for the output
    150     *
    151     * @param jarFile      the input file
    152     * @param outputStream TODO
    153     * @param options      packing options (if null then defaults are used)
    154     * @throws IOException If an I/O error occurs.
    155     */
    156    public Archive(final JarFile jarFile, OutputStream outputStream, PackingOptions options) throws IOException {
    157        if (options == null) { // use all defaults
    158            options = new PackingOptions();
    159        }
    160        this.options = options;
    161        if (options.isGzip()) {
    162            outputStream = new GZIPOutputStream(outputStream);
    163        }
    164        this.outputStream = new BufferedOutputStream(outputStream);
    165        this.jarFile = jarFile;
    166        jarInputStream = null;
    167        PackingUtils.config(options);
    168    }
    169
    170    /**
    171     * Creates an Archive with streams for the input and output.
    172     *
    173     * @param inputStream  TODO
    174     * @param outputStream TODO
    175     * @param options      packing options (if null then defaults are used)
    176     * @throws IOException If an I/O error occurs.
    177     */
    178    public Archive(final JarInputStream inputStream, OutputStream outputStream, PackingOptions options) throws IOException {
    179        jarInputStream = inputStream;
    180        if (options == null) {
    181            // use all defaults
    182            options = new PackingOptions();
    183        }
    184        this.options = options;
    185        if (options.isGzip()) {
    186            outputStream = new GZIPOutputStream(outputStream);
    187        }
    188        this.outputStream = new BufferedOutputStream(outputStream);
    189        PackingUtils.config(options);
    190    }
    191
    192    private boolean addJarEntry(final PackingFile packingFile, final List<Pack200ClassReader> javaClasses, final List<PackingFile> files) {
    193        final long segmentLimit = options.getSegmentLimit();
    194        if (segmentLimit != -1 && segmentLimit != 0) {
    195            // -1 is a special case where only one segment is created and
    196            // 0 is a special case where one segment is created for each file
    197            // except for files in "META-INF"
    198            final long packedSize = estimateSize(packingFile);
    199            if (packedSize + currentSegmentSize > segmentLimit && currentSegmentSize > 0) {
    200                // don't add this JarEntry to the current segment
    201                return false;
    202            }
    203            // do add this JarEntry
    204            currentSegmentSize += packedSize;
    205        }
    206
    207        final String name = packingFile.getName();
    208        if (name.endsWith(".class") && !options.isPassFile(name)) {
    209            final Pack200ClassReader classParser = new Pack200ClassReader(packingFile.contents);
    210            classParser.setFileName(name);
    211            javaClasses.add(classParser);
    212            packingFile.contents = EMPTY_BYTE_ARRAY;
    213        }
    214        files.add(packingFile);
    215        return true;
    216    }
    217
    218    private void doNormalPack() throws IOException, Pack200Exception {
    219        PackingUtils.log("Start to perform a normal packing");
    220        List<PackingFile> packingFileList;
    221        if (jarInputStream != null) {
    222            packingFileList = PackingUtils.getPackingFileListFromJar(jarInputStream, options.isKeepFileOrder());
    223        } else {
    224            packingFileList = PackingUtils.getPackingFileListFromJar(jarFile, options.isKeepFileOrder());
    225        }
    226
    227        final List<SegmentUnit> segmentUnitList = splitIntoSegments(packingFileList);
    228        int previousByteAmount = 0;
    229        int packedByteAmount = 0;
    230
    231        final int segmentSize = segmentUnitList.size();
    232        SegmentUnit segmentUnit;
    233        for (int index = 0; index < segmentSize; index++) {
    234            segmentUnit = segmentUnitList.get(index);
    235            new Segment().pack(segmentUnit, outputStream, options);
    236            previousByteAmount += segmentUnit.getByteAmount();
    237            packedByteAmount += segmentUnit.getPackedByteAmount();
    238        }
    239
    240        PackingUtils.log("Total: Packed " + previousByteAmount + " input bytes of " + packingFileList.size() + " files into " + packedByteAmount + " bytes in "
    241                + segmentSize + " segments");
    242
    243        outputStream.close();
    244    }
    245
    246    private void doZeroEffortPack() throws IOException {
    247        PackingUtils.log("Start to perform a zero-effort packing");
    248        if (jarInputStream != null) {
    249            PackingUtils.copyThroughJar(jarInputStream, outputStream);
    250        } else {
    251            PackingUtils.copyThroughJar(jarFile, outputStream);
    252        }
    253    }
    254
    255    private long estimateSize(final PackingFile packingFile) {
    256        // The heuristic used here is for compatibility with the RI and should
    257        // not be changed
    258        final String name = packingFile.getName();
    259        if (name.startsWith("META-INF") || name.startsWith("/META-INF")) {
    260            return 0;
    261        }
    262        long fileSize = packingFile.contents.length;
    263        if (fileSize < 0) {
    264            fileSize = 0;
    265        }
    266        return name.length() + fileSize + 5;
    267    }
    268
    269    /**
    270     * Packs the archive.
    271     *
    272     * @throws Pack200Exception TODO
    273     * @throws IOException      If an I/O error occurs.
    274     */
    275    public void pack() throws Pack200Exception, IOException {
    276        if (0 == options.getEffort()) {
    277            doZeroEffortPack();
    278        } else {
    279            doNormalPack();
    280        }
    281    }
    282
    283    private List<SegmentUnit> splitIntoSegments(final List<PackingFile> packingFileList) {
    284        final List<SegmentUnit> segmentUnitList = new ArrayList<>();
    285        List<Pack200ClassReader> classes = new ArrayList<>();
    286        List<PackingFile> files = new ArrayList<>();
    287        final long segmentLimit = options.getSegmentLimit();
    288
    289        final int size = packingFileList.size();
    290        PackingFile packingFile;
    291        for (int index = 0; index < size; index++) {
    292            packingFile = packingFileList.get(index);
    293            if (!addJarEntry(packingFile, classes, files)) {
    294                // not added because segment has reached maximum size
    295                segmentUnitList.add(new SegmentUnit(classes, files));
    296                classes = new ArrayList<>();
    297                files = new ArrayList<>();
    298                currentSegmentSize = 0;
    299                // add the jar to a new segment
    300                addJarEntry(packingFile, classes, files);
    301                // ignore the size of first entry for compatibility with RI
    302                currentSegmentSize = 0;
    303            } else if (segmentLimit == 0 && estimateSize(packingFile) > 0) {
    304                // create a new segment for each class unless size is 0
    305                segmentUnitList.add(new SegmentUnit(classes, files));
    306                classes = new ArrayList<>();
    307                files = new ArrayList<>();
    308            }
    309        }
    310        // Change for Apache Commons Compress based on Apache Harmony.
    311        // if (classes.size() > 0 && files.size() > 0) {
    312        if (classes.size() > 0 || files.size() > 0) {
    313            segmentUnitList.add(new SegmentUnit(classes, files));
    314        }
    315        return segmentUnitList;
    316    }
    317
    318}