org.tukaani.xz.common.EncoderUtil Maven / Gradle / Ivy

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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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/*
 * EncoderUtil
 *
 * 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;

import java.io.OutputStream;
import java.io.IOException;
import java.util.zip.CRC32;

public class EncoderUtil extends Util {
    public static void writeCRC32(OutputStream out, byte[] buf)
            throws IOException {
        CRC32 crc32 = new CRC32();
        crc32.update(buf);
        long value = crc32.getValue();

        for (int i = 0; i < 4; ++i)
            out.write((byte)(value >>> (i * 8)));
    }

    public static void encodeVLI(OutputStream out, long num)
            throws IOException {
        while (num >= 0x80) {
            out.write((byte)(num | 0x80));
            num >>>= 7;
        }

        out.write((byte)num);
    }
}