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package org.bouncycastle.asn1;
import java.io.IOException;
import org.bouncycastle.util.Arrays;
/**
* Public facade of ASN.1 Boolean data.
* <p>
* Use following to place a new instance of ASN.1 Boolean in your dataset:
* </p>
* <ul>
* <li> ASN1Boolean.TRUE literal</li>
* <li> ASN1Boolean.FALSE literal</li>
* <li> {@link ASN1Boolean#getInstance(boolean) ASN1Boolean.getInstance(boolean)}</li>
* <li> {@link ASN1Boolean#getInstance(int) ASN1Boolean.getInstance(int)}</li>
* </ul>
* </p>
*/
public class ASN1Boolean
extends ASN1Primitive
{
private static final byte[] TRUE_VALUE = new byte[] { (byte)0xff };
private static final byte[] FALSE_VALUE = new byte[] { 0 };
private byte[] value;
public static final ASN1Boolean FALSE = new ASN1Boolean(false);
public static final ASN1Boolean TRUE = new ASN1Boolean(true);
/**
* return a boolean from the passed in object.
*
* @param obj an ASN1Boolean or an object that can be converted into one.
* @exception IllegalArgumentException if the object cannot be converted.
* @return an ASN1Boolean instance.
*/
public static ASN1Boolean getInstance(
Object obj)
{
if (obj == null || obj instanceof ASN1Boolean)
{
return (ASN1Boolean)obj;
}
if (obj instanceof byte[])
{
byte[] enc = (byte[])obj;
try
{
return (ASN1Boolean)fromByteArray(enc);
}
catch (IOException e)
{
throw new IllegalArgumentException("failed to construct boolean from byte[]: " + e.getMessage());
}
}
throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
}
/**
* return an ASN1Boolean from the passed in boolean.
* @return an ASN1Boolean instance.
*/
public static ASN1Boolean getInstance(
boolean value)
{
return (value ? TRUE : FALSE);
}
/**
* return an ASN1Boolean from the passed in value.
* @return an ASN1Boolean instance.
*/
public static ASN1Boolean getInstance(
int value)
{
return (value != 0 ? TRUE : FALSE);
}
/**
* return a Boolean 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 an ASN1Boolean instance.
*/
public static ASN1Boolean getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
ASN1Primitive o = obj.getObject();
if (explicit || o instanceof ASN1Boolean)
{
return getInstance(o);
}
else
{
return ASN1Boolean.fromOctetString(((ASN1OctetString)o).getOctets());
}
}
ASN1Boolean(
byte[] value)
{
if (value.length != 1)
{
throw new IllegalArgumentException("byte value should have 1 byte in it");
}
if (value[0] == 0)
{
this.value = FALSE_VALUE;
}
else if ((value[0] & 0xff) == 0xff)
{
this.value = TRUE_VALUE;
}
else
{
this.value = Arrays.clone(value);
}
}
/**
* @deprecated use getInstance(boolean) method.
* @param value true or false.
*/
public ASN1Boolean(
boolean value)
{
this.value = (value) ? TRUE_VALUE : FALSE_VALUE;
}
public boolean isTrue()
{
return (value[0] != 0);
}
boolean isConstructed()
{
return false;
}
int encodedLength()
{
return 3;
}
void encode(
ASN1OutputStream out)
throws IOException
{
out.writeEncoded(BERTags.BOOLEAN, value);
}
protected boolean asn1Equals(
ASN1Primitive o)
{
if (o instanceof ASN1Boolean)
{
return (value[0] == ((ASN1Boolean)o).value[0]);
}
return false;
}
public int hashCode()
{
return value[0];
}
public String toString()
{
return (value[0] != 0) ? "TRUE" : "FALSE";
}
static ASN1Boolean fromOctetString(byte[] value)
{
if (value.length != 1)
{
throw new IllegalArgumentException("BOOLEAN value should have 1 byte in it");
}
if (value[0] == 0)
{
return FALSE;
}
else if ((value[0] & 0xff) == 0xff)
{
return TRUE;
}
else
{
return new ASN1Boolean(value);
}
}
}
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