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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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/*
 * LZMA2Decoder
 *
 * 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;

import java.io.InputStream;

class LZMA2Decoder extends LZMA2Coder implements FilterDecoder {
    private int dictSize;

    LZMA2Decoder(byte[] props) throws UnsupportedOptionsException {
        // Up to 1.5 GiB dictionary is supported. The bigger ones
        // are too big for int.
        if (props.length != 1 || (props[0] & 0xFF) > 37)
            throw new UnsupportedOptionsException(
                    "Unsupported LZMA2 properties");

        dictSize = 2 | (props[0] & 1);
        dictSize <<= (props[0] >>> 1) + 11;
    }

    public int getMemoryUsage() {
        return LZMA2InputStream.getMemoryUsage(dictSize);
    }

    public InputStream getInputStream(InputStream in, ArrayCache arrayCache) {
        return new LZMA2InputStream(in, dictSize, null, arrayCache);
    }
}