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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 integer element that is backed by a Java
* {@code int}, which is a signed 32-bit value and can represent any integer
* between -2147483648 and 2147483647. If you need support for integer values
* in the signed 64-bit range, see the {@link ASN1Long} class as an alternative.
* If you need support for integer values of arbitrary size, see
* {@link ASN1BigInteger}.
*/
@NotMutable()
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ASN1Integer
extends ASN1Element
{
/**
* The serial version UID for this serializable class.
*/
private static final long serialVersionUID = -733929804601994372L;
// The int value for this element.
private final int intValue;
/**
* Creates a new ASN.1 integer element with the default BER type and the
* provided int value.
*
* @param intValue The int value to use for this element.
*/
public ASN1Integer(final int intValue)
{
super(ASN1Constants.UNIVERSAL_INTEGER_TYPE, encodeIntValue(intValue));
this.intValue = intValue;
}
/**
* Creates a new ASN.1 integer 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 ASN1Integer(final byte type, final int intValue)
{
super(type, encodeIntValue(intValue));
this.intValue = intValue;
}
/**
* Creates a new ASN.1 integer 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 ASN1Integer(final byte type, final int intValue,
@NotNull final byte[] value)
{
super(type, value);
this.intValue = intValue;
}
/**
* Encodes the provided int value to a byte array suitable for use as the
* value of an integer element.
*
* @param intValue The int value to be encoded.
*
* @return A byte array containing the encoded value.
*/
@NotNull()
static byte[] encodeIntValue(final int intValue)
{
if (intValue < 0)
{
if ((intValue & 0xFFFF_FF80) == 0xFFFF_FF80)
{
return new byte[]
{
(byte) (intValue & 0xFF)
};
}
else if ((intValue & 0xFFFF_8000) == 0xFFFF_8000)
{
return new byte[]
{
(byte) ((intValue >> 8) & 0xFF),
(byte) (intValue & 0xFF)
};
}
else if ((intValue & 0xFF80_0000) == 0xFF80_0000)
{
return new byte[]
{
(byte) ((intValue >> 16) & 0xFF),
(byte) ((intValue >> 8) & 0xFF),
(byte) (intValue & 0xFF)
};
}
else
{
return new byte[]
{
(byte) ((intValue >> 24) & 0xFF),
(byte) ((intValue >> 16) & 0xFF),
(byte) ((intValue >> 8) & 0xFF),
(byte) (intValue & 0xFF)
};
}
}
else
{
if ((intValue & 0x0000_007F) == intValue)
{
return new byte[]
{
(byte) (intValue & 0x7F)
};
}
else if ((intValue & 0x0000_7FFF) == intValue)
{
return new byte[]
{
(byte) ((intValue >> 8) & 0x7F),
(byte) (intValue & 0xFF)
};
}
else if ((intValue & 0x007F_FFFF) == intValue)
{
return new byte[]
{
(byte) ((intValue >> 16) & 0x7F),
(byte) ((intValue >> 8) & 0xFF),
(byte) (intValue & 0xFF)
};
}
else
{
return new byte[]
{
(byte) ((intValue >> 24) & 0x7F),
(byte) ((intValue >> 16) & 0xFF),
(byte) ((intValue >> 8) & 0xFF),
(byte) (intValue & 0xFF)
};
}
}
}
/**
* 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 integer element.
*
* @param elementBytes The byte array to decode as an ASN.1 integer element.
*
* @return The decoded ASN.1 integer element.
*
* @throws ASN1Exception If the provided array cannot be decoded as an
* integer element.
*/
@NotNull()
public static ASN1Integer decodeAsInteger(@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 ASN1Integer(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 integer element.
*
* @param element The ASN.1 element to be decoded.
*
* @return The decoded ASN.1 integer element.
*
* @throws ASN1Exception If the provided element cannot be decoded as an
* integer element.
*/
@NotNull()
public static ASN1Integer decodeAsInteger(@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_INTEGER_INVALID_LENGTH.get(value.length));
}
return new ASN1Integer(element.getType(), intValue, value);
}
/**
* {@inheritDoc}
*/
@Override()
public void toString(@NotNull final StringBuilder buffer)
{
buffer.append(intValue);
}
}