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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);
}
}
}
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