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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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/*
 * Util
 *
 * Author: Lasse Collin 
 *
 * This file has been put into the public domain.
 * You can do whatever you want with this file.
 */

package org.tukaani.xz.common;

public class Util {
    public static final int STREAM_HEADER_SIZE = 12;
    public static final long BACKWARD_SIZE_MAX = 1L << 34;
    public static final int BLOCK_HEADER_SIZE_MAX = 1024;
    public static final long VLI_MAX = Long.MAX_VALUE;
    public static final int VLI_SIZE_MAX = 9;

    public static int getVLISize(long num) {
        int size = 0;
        do {
            ++size;
            num >>= 7;
        } while (num != 0);

        return size;
    }
}