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Apache Commons Compress 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;
    /// 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;
    /// Temporary properties for non-empty files (subsumed into the files array later).
    SubStreamsInfo subStreamsInfo;
    /// The files and directories in the archive.
    SevenZArchiveEntry[] files;
    /// 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); 
    }
}