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The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use
Java API for communicating with LDAP directory servers and performing
related tasks like reading and writing LDIF, encoding and decoding data
using base64 and ASN.1 BER, and performing secure communication. This
package contains the Standard Edition of the LDAP SDK, which is a
complete, general-purpose library for communicating with LDAPv3 directory
servers.
/*
* Copyright 2007-2021 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright 2007-2021 Ping Identity Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright (C) 2007-2021 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.asn1;
import com.unboundid.util.Debug;
import com.unboundid.util.NotMutable;
import com.unboundid.util.NotNull;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;
import static com.unboundid.asn1.ASN1Messages.*;
/**
* This class provides an ASN.1 enumerated element. Enumerated elements are
* very similar to integer elements, and the only real difference between them
* is that the individual values of an enumerated element have a symbolic
* significance (i.e., each value is associated with a particular meaning),
* although this does not impact its encoding other than through the use of a
* different default BER type.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ASN1Enumerated
extends ASN1Element
{
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -5915912036130847725L;
// The int value for this element.
private final int intValue;
/**
* Creates a new ASN.1 enumerated element with the default BER type and the
* provided int value.
*
* @param intValue The int value to use for this element.
*/
public ASN1Enumerated(final int intValue)
{
super(ASN1Constants.UNIVERSAL_ENUMERATED_TYPE,
ASN1Integer.encodeIntValue(intValue));
this.intValue = intValue;
}
/**
* Creates a new ASN.1 enumerated element with the specified BER type and the
* provided int value.
*
* @param type The BER type to use for this element.
* @param intValue The int value to use for this element.
*/
public ASN1Enumerated(final byte type, final int intValue)
{
super(type, ASN1Integer.encodeIntValue(intValue));
this.intValue = intValue;
}
/**
* Creates a new ASN.1 enumerated element with the specified BER type and the
* provided int and pre-encoded values.
*
* @param type The BER type to use for this element.
* @param intValue The int value to use for this element.
* @param value The pre-encoded value to use for this element.
*/
private ASN1Enumerated(final byte type, final int intValue,
@NotNull final byte[] value)
{
super(type, value);
this.intValue = intValue;
}
/**
* Retrieves the int value for this element.
*
* @return The int value for this element.
*/
public int intValue()
{
return intValue;
}
/**
* Decodes the contents of the provided byte array as an enumerated element.
*
* @param elementBytes The byte array to decode as an ASN.1 enumerated
* element.
*
* @return The decoded ASN.1 enumerated element.
*
* @throws ASN1Exception If the provided array cannot be decoded as an
* enumerated element.
*/
@NotNull()
public static ASN1Enumerated decodeAsEnumerated(
@NotNull final byte[] elementBytes)
throws ASN1Exception
{
try
{
int valueStartPos = 2;
int length = (elementBytes[1] & 0x7F);
if (length != elementBytes[1])
{
final int numLengthBytes = length;
length = 0;
for (int i=0; i < numLengthBytes; i++)
{
length <<= 8;
length |= (elementBytes[valueStartPos++] & 0xFF);
}
}
if ((elementBytes.length - valueStartPos) != length)
{
throw new ASN1Exception(ERR_ELEMENT_LENGTH_MISMATCH.get(length,
(elementBytes.length - valueStartPos)));
}
final byte[] value = new byte[length];
System.arraycopy(elementBytes, valueStartPos, value, 0, length);
int intValue;
switch (value.length)
{
case 1:
intValue = (value[0] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFFFF_FF00;
}
break;
case 2:
intValue = ((value[0] & 0xFF) << 8) | (value[1] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFFFF_0000;
}
break;
case 3:
intValue = ((value[0] & 0xFF) << 16) | ((value[1] & 0xFF) << 8) |
(value[2] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFF00_0000;
}
break;
case 4:
intValue = ((value[0] & 0xFF) << 24) | ((value[1] & 0xFF) << 16) |
((value[2] & 0xFF) << 8) | (value[3] & 0xFF);
break;
default:
throw new ASN1Exception(ERR_ENUMERATED_INVALID_LENGTH.get(
value.length));
}
return new ASN1Enumerated(elementBytes[0], intValue, value);
}
catch (final ASN1Exception ae)
{
Debug.debugException(ae);
throw ae;
}
catch (final Exception e)
{
Debug.debugException(e);
throw new ASN1Exception(ERR_ELEMENT_DECODE_EXCEPTION.get(e), e);
}
}
/**
* Decodes the provided ASN.1 element as an enumerated element.
*
* @param element The ASN.1 element to be decoded.
*
* @return The decoded ASN.1 enumerated element.
*
* @throws ASN1Exception If the provided element cannot be decoded as an
* enumerated element.
*/
@NotNull()
public static ASN1Enumerated decodeAsEnumerated(
@NotNull final ASN1Element element)
throws ASN1Exception
{
int intValue;
final byte[] value = element.getValue();
switch (value.length)
{
case 1:
intValue = (value[0] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFFFF_FF00;
}
break;
case 2:
intValue = ((value[0] & 0xFF) << 8) | (value[1] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFFFF_0000;
}
break;
case 3:
intValue = ((value[0] & 0xFF) << 16) | ((value[1] & 0xFF) << 8) |
(value[2] & 0xFF);
if ((value[0] & 0x80) != 0x00)
{
intValue |= 0xFF00_0000;
}
break;
case 4:
intValue = ((value[0] & 0xFF) << 24) | ((value[1] & 0xFF) << 16) |
((value[2] & 0xFF) << 8) | (value[3] & 0xFF);
break;
default:
throw new ASN1Exception(ERR_ENUMERATED_INVALID_LENGTH.get(
value.length));
}
return new ASN1Enumerated(element.getType(), intValue, value);
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(@NotNull final StringBuilder buffer)
{
buffer.append(intValue);
}
}