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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;

final class Archive {

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

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

    /** 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 = Folder.EMPTY_FOLDER_ARRAY;

    /** Temporary properties for non-empty files (subsumed into the files array later). */
    SubStreamsInfo subStreamsInfo;

    /** The files and directories in the archive. */
    SevenZArchiveEntry[] files = SevenZArchiveEntry.EMPTY_SEVEN_Z_ARCHIVE_ENTRY_ARRAY;

    /** 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;
    }
}