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Standalone fully-featured Whatsapp Web API for Java and Kotlin
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// Mirrored minimal version of sun.security.util.DerOutputStream

/*
 * Copyright (c) 1996, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package it.auties.whatsapp.crypto;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;


/**
 * Output stream marshaling DER-encoded data.  This is eventually provided
 * in the form of a byte array; there is no advance limit on the size of
 * that byte array.
 *
 * At this time, this class supports only a subset of the types of
 * DER data encodings which are defined.  That subset is sufficient for
 * generating most X.509 certificates.
 *
 * @author David Brownell
 * @author Amit Kapoor
 * @author Hemma Prafullchandra
 */
public class DerOutputStream extends ByteArrayOutputStream {
    private static final byte tag_Integer = 0x02;
    private static final byte tag_BitString = 0x03;
    private static final byte tag_Sequence = 0x30;

    public void writeSequence(byte[] buf) {
        write(tag_Sequence);
        putLength(buf.length);
        write(buf, 0, buf.length);
    }


    public void putInteger(BigInteger i) {
        write(tag_Integer);
        byte[] buf = i.toByteArray(); // least number  of bytes
        putLength(buf.length);
        write(buf, 0, buf.length);
    }

    public void putBitString(byte[] bits) throws IOException {
        write(tag_BitString);
        putLength(bits.length + 1);
        write(0);               // all of last octet is used
        write(bits);
    }

    private void putLength(int len) {
        if (len < 128) {
            write((byte) len);

        } else if (len < (1 << 8)) {
            write((byte) 0x081);
            write((byte) len);

        } else if (len < (1 << 16)) {
            write((byte) 0x082);
            write((byte) (len >> 8));
            write((byte) len);

        } else if (len < (1 << 24)) {
            write((byte) 0x083);
            write((byte) (len >> 16));
            write((byte) (len >> 8));
            write((byte) len);

        } else {
            write((byte) 0x084);
            write((byte) (len >> 24));
            write((byte) (len >> 16));
            write((byte) (len >> 8));
            write((byte) len);
        }
    }
}