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Apache Commons Compress software defines an API for working with compression and archive formats. These include: bzip2, gzip, pack200, lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4, Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.commons.compress.archivers.sevenz;

import java.util.BitSet;

class Archive {
    /// Offset from beginning of file + SIGNATURE_HEADER_SIZE to packed streams.
    long packPos;
    /// Size of each packed stream.
    long[] packSizes = new long[0];
    /// Whether each particular packed streams has a CRC.
    BitSet packCrcsDefined;
    /// CRCs for each packed stream, valid only if that packed stream has one.
    long[] packCrcs;
    /// Properties of solid compression blocks.
    Folder[] folders = new Folder[0];
    /// Temporary properties for non-empty files (subsumed into the files array later).
    SubStreamsInfo subStreamsInfo;
    /// The files and directories in the archive.
    SevenZArchiveEntry[] files = new SevenZArchiveEntry[0];
    /// Mapping between folders, files and streams.
    StreamMap streamMap;

    @Override
    public String toString() {
        return "Archive with packed streams starting at offset " + packPos
            + ", " + lengthOf(packSizes) + " pack sizes, " + lengthOf(packCrcs)
            + " CRCs, " + lengthOf(folders) + " folders, " + lengthOf(files)
            + " files and " + streamMap;
    }

    private static String lengthOf(final long[] a) {
        return a == null ? "(null)" : String.valueOf(a.length);
    }

    private static String lengthOf(final Object[] a) {
        return a == null ? "(null)" : String.valueOf(a.length);
    }
}