package com.lowagie.bc.asn1; import java.io.ByteArrayOutputStream; import java.io.IOException; /** * DER UTF8String object. */ public class DERUTF8String extends DERObject implements DERString { String string; /** * return an UTF8 string from the passed in object. * * @exception IllegalArgumentException if the object cannot be converted. */ public static DERUTF8String getInstance( Object obj) { if (obj == null || obj instanceof DERUTF8String) { return (DERUTF8String)obj; } if (obj instanceof ASN1OctetString) { return new DERUTF8String(((ASN1OctetString)obj).getOctets()); } if (obj instanceof ASN1TaggedObject) { return getInstance(((ASN1TaggedObject)obj).getObject()); } throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName()); } /** * return an UTF8 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. */ public static DERUTF8String getInstance( ASN1TaggedObject obj, boolean explicit) { return getInstance(obj.getObject()); } /** * basic constructor - byte encoded string. */ DERUTF8String( byte[] string) { int i = 0; int length = 0; while (i < string.length) { length++; if ((string[i] & 0xe0) == 0xe0) { i += 3; } else if ((string[i] & 0xc0) == 0xc0) { i += 2; } else { i += 1; } } char[] cs = new char[length]; i = 0; length = 0; while (i < string.length) { char ch; if ((string[i] & 0xe0) == 0xe0) { ch = (char)(((string[i] & 0x1f) << 12) | ((string[i + 1] & 0x3f) << 6) | (string[i + 2] & 0x3f)); i += 3; } else if ((string[i] & 0xc0) == 0xc0) { ch = (char)(((string[i] & 0x3f) << 6) | (string[i + 1] & 0x3f)); i += 2; } else { ch = (char)(string[i] & 0xff); i += 1; } cs[length++] = ch; } this.string = new String(cs); } /** * basic constructor */ public DERUTF8String( String string) { this.string = string; } public String getString() { return string; } public int hashCode() { return this.getString().hashCode(); } public boolean equals( Object o) { if (!(o instanceof DERUTF8String)) { return false; } DERUTF8String s = (DERUTF8String)o; return this.getString().equals(s.getString()); } void encode( DEROutputStream out) throws IOException { char[] c = string.toCharArray(); ByteArrayOutputStream bOut = new ByteArrayOutputStream(); for (int i = 0; i != c.length; i++) { char ch = c[i]; if (ch < 0x0080) { bOut.write(ch); } else if (ch < 0x0800) { bOut.write(0xc0 | (ch >> 6)); bOut.write(0x80 | (ch & 0x3f)); } else { bOut.write(0xe0 | (ch >> 12)); bOut.write(0x80 | ((ch >> 6) & 0x3F)); bOut.write(0x80 | (ch & 0x3F)); } } out.writeEncoded(UTF8_STRING, bOut.toByteArray()); } }