    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.IOException;
    020import java.io.OutputStream;
    021import java.util.Arrays;
    022import java.util.HashSet;
    023import java.util.List;
    024import java.util.Set;
    025import java.util.TimeZone;
    026
    027import org.apache.commons.compress.harmony.pack200.Archive.PackingFile;
    028import org.apache.commons.compress.harmony.pack200.Archive.SegmentUnit;
    029import org.apache.commons.compress.utils.ExactMath;
    030import org.objectweb.asm.ClassReader;
    031
    032/**
    033 * Bands containing information about files in the pack200 archive and the file contents for non-class-files.
    034 * Corresponds to the {@code file_bands} set of bands described in the specification.
    035 */
    036public class FileBands extends BandSet {
    037
    038    private final CPUTF8[] fileName;
    039    private int[] file_name;
    040    private final int[] file_modtime;
    041    private final long[] file_size;
    042    private final int[] file_options;
    043    private final byte[][] file_bits;
    044    private final List<PackingFile> fileList;
    045    private final PackingOptions options;
    046    private final CpBands cpBands;
    047
    048    public FileBands(final CpBands cpBands, final SegmentHeader segmentHeader, final PackingOptions options,
    049        final SegmentUnit segmentUnit, final int effort) {
    050        super(effort, segmentHeader);
    051        fileList = segmentUnit.getFileList();
    052        this.options = options;
    053        this.cpBands = cpBands;
    054        final int size = fileList.size();
    055        fileName = new CPUTF8[size];
    056        file_modtime = new int[size];
    057        file_size = new long[size];
    058        file_options = new int[size];
    059        int totalSize = 0;
    060        file_bits = new byte[size][];
    061        final int archiveModtime = segmentHeader.getArchive_modtime();
    062
    063        final Set<String> classNames = new HashSet<>();
    064        for (final ClassReader reader : segmentUnit.getClassList()) {
    065            classNames.add(reader.getClassName());
    066        }
    067        final CPUTF8 emptyString = cpBands.getCPUtf8("");
    068        long modtime;
    069        int latestModtime = Integer.MIN_VALUE;
    070        final boolean isLatest = !PackingOptions.KEEP.equals(options.getModificationTime());
    071        for (int i = 0; i < size; i++) {
    072            final PackingFile packingFile = fileList.get(i);
    073            final String name = packingFile.getName();
    074            if (name.endsWith(".class") && !options.isPassFile(name)) {
    075                file_options[i] |= 1 << 1;
    076                if (classNames.contains(name.substring(0, name.length() - 6))) {
    077                    fileName[i] = emptyString;
    078                } else {
    079                    fileName[i] = cpBands.getCPUtf8(name);
    080                }
    081            } else {
    082                fileName[i] = cpBands.getCPUtf8(name);
    083            }
    084            // set deflate_hint for file element
    085            if (options.isKeepDeflateHint() && packingFile.isDefalteHint()) {
    086                file_options[i] |= 0x1;
    087            }
    088            final byte[] bytes = packingFile.getContents();
    089            file_size[i] = bytes.length;
    090            totalSize = ExactMath.add(totalSize, file_size[i]);
    091
    092            // update modification time
    093            modtime = (packingFile.getModtime() + TimeZone.getDefault().getRawOffset()) / 1000L;
    094            file_modtime[i] = (int) (modtime - archiveModtime);
    095            if (isLatest && latestModtime < file_modtime[i]) {
    096                latestModtime = file_modtime[i];
    097            }
    098
    099            file_bits[i] = packingFile.getContents();
    100        }
    101
    102        if (isLatest) {
    103            Arrays.fill(file_modtime, latestModtime);
    104        }
    105    }
    106
    107    /**
    108     * All input classes for the segment have now been read in, so this method is called so that this class can
    109     * calculate/complete anything it could not do while classes were being read.
    110     */
    111    public void finaliseBands() {
    112        file_name = new int[fileName.length];
    113        for (int i = 0; i < file_name.length; i++) {
    114            if (fileName[i].equals(cpBands.getCPUtf8(""))) {
    115                final PackingFile packingFile = fileList.get(i);
    116                final String name = packingFile.getName();
    117                if (options.isPassFile(name)) {
    118                    fileName[i] = cpBands.getCPUtf8(name);
    119                    file_options[i] &= 1 << 1 ^ 0xFFFFFFFF;
    120                }
    121            }
    122            file_name[i] = fileName[i].getIndex();
    123        }
    124    }
    125
    126    private int[] flatten(final byte[][] bytes) {
    127        int total = 0;
    128        for (final byte[] element : bytes) {
    129            total += element.length;
    130        }
    131        final int[] band = new int[total];
    132        int index = 0;
    133        for (final byte[] element : bytes) {
    134            for (final byte element2 : element) {
    135                band[index++] = element2 & 0xFF;
    136            }
    137        }
    138        return band;
    139    }
    140
    141    @Override
    142    public void pack(final OutputStream out) throws IOException, Pack200Exception {
    143        PackingUtils.log("Writing file bands...");
    144        byte[] encodedBand = encodeBandInt("file_name", file_name, Codec.UNSIGNED5);
    145        out.write(encodedBand);
    146        PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_name[" + file_name.length + "]");
    147
    148        encodedBand = encodeFlags("file_size", file_size, Codec.UNSIGNED5, Codec.UNSIGNED5,
    149            segmentHeader.have_file_size_hi());
    150        out.write(encodedBand);
    151        PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_size[" + file_size.length + "]");
    152
    153        if (segmentHeader.have_file_modtime()) {
    154            encodedBand = encodeBandInt("file_modtime", file_modtime, Codec.DELTA5);
    155            out.write(encodedBand);
    156            PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_modtime[" + file_modtime.length + "]");
    157        }
    158        if (segmentHeader.have_file_options()) {
    159            encodedBand = encodeBandInt("file_options", file_options, Codec.UNSIGNED5);
    160            out.write(encodedBand);
    161            PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_options[" + file_options.length + "]");
    162        }
    163
    164        encodedBand = encodeBandInt("file_bits", flatten(file_bits), Codec.BYTE1);
    165        out.write(encodedBand);
    166        PackingUtils.log("Wrote " + encodedBand.length + " bytes from file_bits[" + file_bits.length + "]");
    167    }
    168
    169}