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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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/*
 * RawCoder
 *
 * 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;

class RawCoder {
    static void validate(FilterCoder[] filters)
            throws UnsupportedOptionsException {
        for (int i = 0; i < filters.length - 1; ++i)
            if (!filters[i].nonLastOK())
                throw new UnsupportedOptionsException(
                        "Unsupported XZ filter chain");

        if (!filters[filters.length - 1].lastOK())
            throw new UnsupportedOptionsException(
                    "Unsupported XZ filter chain");

        int changesSizeCount = 0;
        for (int i = 0; i < filters.length; ++i)
            if (filters[i].changesSize())
                ++changesSizeCount;

        if (changesSizeCount > 3)
            throw new UnsupportedOptionsException(
                    "Unsupported XZ filter chain");
    }
}