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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());
}
}
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