package org.bouncycastle.asn1; import java.io.IOException; import org.bouncycastle.util.Arrays; /** * DER BMPString object. */ public class DERBMPString extends ASN1Primitive implements ASN1String { private char[] string; /** * return a BMP String from the given object. * * @param obj the object we want converted. * @exception IllegalArgumentException if the object cannot be converted. * @return a DERBMPString instance, or null. */ public static DERBMPString getInstance( Object obj) { if (obj == null || obj instanceof DERBMPString) { return (DERBMPString)obj; } if (obj instanceof byte[]) { try { return (DERBMPString)fromByteArray((byte[])obj); } catch (Exception e) { throw new IllegalArgumentException("encoding error in getInstance: " + e.toString()); } } 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. * @exception IllegalArgumentException if the tagged object cannot * be converted. * @return a DERBMPString instance. */ public static DERBMPString getInstance( ASN1TaggedObject obj, boolean explicit) { ASN1Primitive o = obj.getObject(); if (explicit || o instanceof DERBMPString) { return getInstance(o); } else { return new DERBMPString(ASN1OctetString.getInstance(o).getOctets()); } } /** * basic constructor - byte encoded string. * @param string the encoded BMP STRING to wrap. */ 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 = cs; } DERBMPString(char[] string) { this.string = string; } /** * basic constructor * @param string a String to wrap as a BMP STRING. */ public DERBMPString( String string) { this.string = string.toCharArray(); } public String getString() { return new String(string); } public String toString() { return getString(); } public int hashCode() { return Arrays.hashCode(string); } protected boolean asn1Equals( ASN1Primitive o) { if (!(o instanceof DERBMPString)) { return false; } DERBMPString s = (DERBMPString)o; return Arrays.areEqual(string, s.string); } boolean isConstructed() { return false; } int encodedLength() { return 1 + StreamUtil.calculateBodyLength(string.length * 2) + (string.length * 2); } void encode( ASN1OutputStream out) throws IOException { out.write(BERTags.BMP_STRING); out.writeLength(string.length * 2); for (int i = 0; i != string.length; i++) { char c = string[i]; out.write((byte)(c >> 8)); out.write((byte)c); } } }