org.bouncycastle.asn1.DERBMPString Maven / Gradle / Ivy
package org.bouncycastle.asn1;
import java.io.IOException;
import org.bouncycastle.util.Arrays;
/**
* DER BMPString object encodes BMP (Basic Multilingual Plane) subset
* (aka UCS-2) of UNICODE (ISO 10646) characters in codepoints 0 to 65535.
*
* At ISO-10646:2011 the term "BMP" has been withdrawn, and replaced by
* term "UCS-2".
*
*/
public class DERBMPString
extends ASN1Primitive
implements ASN1String
{
private final 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)
{
if (string == null)
{
throw new NullPointerException("'string' cannot be null");
}
int byteLen = string.length;
if (0 != (byteLen & 1))
{
throw new IllegalArgumentException("malformed BMPString encoding encountered");
}
int charLen = byteLen / 2;
char[] cs = new char[charLen];
for (int i = 0; i != charLen; i++)
{
cs[i] = (char)((string[2 * i] << 8) | (string[2 * i + 1] & 0xff));
}
this.string = cs;
}
DERBMPString(char[] string)
{
if (string == null)
{
throw new NullPointerException("'string' cannot be null");
}
this.string = string;
}
/**
* Basic constructor
* @param string a String to wrap as a BMP STRING.
*/
public DERBMPString(
String string)
{
if (string == null)
{
throw new NullPointerException("'string' cannot be null");
}
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, boolean withTag)
throws IOException
{
int count = string.length;
if (withTag)
{
out.write(BERTags.BMP_STRING);
}
out.writeLength(count * 2);
byte[] buf = new byte[8];
int i = 0, limit = count & -4;
while (i < limit)
{
char c0 = string[i], c1 = string[i + 1], c2 = string[i + 2], c3 = string[i + 3];
i += 4;
buf[0] = (byte)(c0 >> 8);
buf[1] = (byte)c0;
buf[2] = (byte)(c1 >> 8);
buf[3] = (byte)c1;
buf[4] = (byte)(c2 >> 8);
buf[5] = (byte)c2;
buf[6] = (byte)(c3 >> 8);
buf[7] = (byte)c3;
out.write(buf, 0, 8);
}
if (i < count)
{
int bufPos = 0;
do
{
char c0 = string[i];
i += 1;
buf[bufPos++] = (byte)(c0 >> 8);
buf[bufPos++] = (byte)c0;
}
while (i < count);
out.write(buf, 0, bufPos);
}
}
}