org.apache.commons.ssl.asn1.DERBMPString Maven / Gradle / Ivy

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package org.apache.commons.ssl.asn1;

import java.io.IOException;

/** DER BMPString object. */
public class DERBMPString
    extends ASN1Object
    implements DERString {
    String string;

    /**
     * return a BMP String from the given object.
     *
     * @param obj the object we want converted.
     * @throws IllegalArgumentException if the object cannot be converted.
     */
    public static DERBMPString getInstance(
        Object obj) {
        if (obj == null || obj instanceof DERBMPString) {
            return (DERBMPString) obj;
        }

        if (obj instanceof ASN1OctetString) {
            return new DERBMPString(((ASN1OctetString) obj).getOctets());
        }

        if (obj instanceof ASN1TaggedObject) {
            return getInstance(((ASN1TaggedObject) obj).getObject());
        }

        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
    }

    /**
     * return a BMP String from a tagged object.
     *
     * @param obj      the tagged object holding the object we want
     * @param explicit true if the object is meant to be explicitly
     *                 tagged false otherwise.
     * @throws IllegalArgumentException if the tagged object cannot
     *                                  be converted.
     */
    public static DERBMPString getInstance(
        ASN1TaggedObject obj,
        boolean explicit) {
        return getInstance(obj.getObject());
    }


    /** basic constructor - byte encoded string. */
    public DERBMPString(
        byte[] string) {
        char[] cs = new char[string.length / 2];

        for (int i = 0; i != cs.length; i++) {
            cs[i] = (char) ((string[2 * i] << 8) | (string[2 * i + 1] & 0xff));
        }

        this.string = new String(cs);
    }

    /** basic constructor */
    public DERBMPString(
        String string) {
        this.string = string;
    }

    public String getString() {
        return string;
    }

    public String toString() {
        return string;
    }

    public int hashCode() {
        return this.getString().hashCode();
    }

    protected boolean asn1Equals(
        DERObject o) {
        if (!(o instanceof DERBMPString)) {
            return false;
        }

        DERBMPString s = (DERBMPString) o;

        return this.getString().equals(s.getString());
    }

    void encode(
        DEROutputStream out)
        throws IOException {
        char[] c = string.toCharArray();
        byte[] b = new byte[c.length * 2];

        for (int i = 0; i != c.length; i++) {
            b[2 * i] = (byte) (c[i] >> 8);
            b[2 * i + 1] = (byte) c[i];
        }

        out.writeEncoded(BMP_STRING, b);
    }
}