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package org.bouncycastle.asn1;
import java.io.IOException;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;
/**
* DER UTF8String object.
*/
public class DERUTF8String
extends ASN1Primitive
implements ASN1String
{
private byte[] string;
/**
* Return an UTF8 string from the passed in object.
*
* @param obj a DERUTF8String or an object that can be converted into one.
* @exception IllegalArgumentException
* if the object cannot be converted.
* @return a DERUTF8String instance, or null
*/
public static DERUTF8String getInstance(Object obj)
{
if (obj == null || obj instanceof DERUTF8String)
{
return (DERUTF8String)obj;
}
if (obj instanceof byte[])
{
try
{
return (DERUTF8String)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 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.
* @return a DERUTF8String instance, or null
*/
public static DERUTF8String getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof DERUTF8String)
{
return getInstance(o);
}
else
{
return new DERUTF8String(ASN1OctetString.getInstance(o).getOctets());
}
}
/**
* Basic constructor - byte encoded string.
*/
DERUTF8String(byte[] string)
{
this.string = string;
}
/**
* Basic constructor
*/
public DERUTF8String(String string)
{
this.string = Strings.toUTF8ByteArray(string);
}
public String getString()
{
return Strings.fromUTF8ByteArray(string);
}
public String toString()
{
return getString();
}
public int hashCode()
{
return Arrays.hashCode(string);
}
boolean asn1Equals(ASN1Primitive o)
{
if (!(o instanceof DERUTF8String))
{
return false;
}
DERUTF8String s = (DERUTF8String)o;
return Arrays.areEqual(string, s.string);
}
boolean isConstructed()
{
return false;
}
int encodedLength()
throws IOException
{
return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
}
void encode(ASN1OutputStream out)
throws IOException
{
out.writeEncoded(BERTags.UTF8_STRING, string);
}
}
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