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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
package org.ietf.ldap.ber.stream;
import java.util.*;
import java.io.*;
/**
* This is the base class for integral types such as Integer and
* Enumerated.
* <P>See CCITT X.209.
*
* <pre>
* ENCODING RULE:
* Primitive Definite length.
* tag = << depends on type >>
* length = (short or long form)
* one or more contents octets hold integral value
* value in two's complement
*
* Example 1: (Integer - zero)
* 02 01 00
* Example 2: (Enumerated - 1)
* 0A 01 01
* Example 3: (Integer - 300, short form)
* 02 02 01 2C
* Example 4: (Integer - 300, long form)
* 02 84 00 00 01 2C
* </pre>
*
* @version 1.0
*/
public abstract class BERIntegral extends BERElement {
/**
* Value of element
*/
private int m_value;
/**
* Constructs an integral type with a value.
* @param value integer value
*/
public BERIntegral(int value) {
m_value = value;
}
/**
* Constructs an integral element from an input stream.
* @param stream source
* @param bytes_read array of 1 int; value incremented by
* number of bytes read from stream
* @exception IOException failed to construct
*/
public BERIntegral(InputStream stream, int[] bytes_read) throws IOException {
int contents_length = super.readLengthOctets(stream, bytes_read);
/* Definite length content octets string. */
if (contents_length > 0) {
boolean negative = false;
int octet = stream.read();
bytes_read[0]++;
if ((octet & 0x80) > 0) /* left-most bit is 1. */
negative = true;
for (int i = 0; i < contents_length; i++) {
if (i > 0) {
octet = stream.read();
bytes_read[0]++;
}
if (negative)
m_value = (m_value<<8) + (int)(octet^0xFF)&0xFF;
else
m_value = (m_value<<8) + (int)(octet&0xFF);
}
if (negative) /* convert to 2's complement */
m_value = (m_value + 1) * -1;
}
}
/**
* Writes BER to stream.
* @param stream output stream
* @exception IOException on failure to write
*/
public void write(OutputStream stream) throws IOException {
int binary_value = m_value;
int num_content_octets = 0;
int total_ber_octets;
int offset=1;
int lead;
int i;
byte[] content_octets = new byte[10]; /* should be plenty big */
byte[] net_octets = new byte[10]; /* pse need this in network order */
/* Get content octets - need to determine length */
if (m_value == 0) {
num_content_octets = 1;
content_octets[offset] = (byte)0x00;
net_octets[offset] = (byte)0x00;
} else {
if (m_value < 0) /* convert from 2's complement */
binary_value = (m_value * -1) -1;
do {
if (m_value < 0)
content_octets[num_content_octets+offset] =
(byte)((binary_value^0xFF)&0xFF);
else
content_octets[num_content_octets+offset] =
(byte)(binary_value&0xFF);
binary_value = (binary_value>>8);
num_content_octets++;
} while (binary_value > 0);
/* pse 1/16/96 we've just created a string that is in non-network order
flip it for net order */
for (i=0; i<num_content_octets; i++)
net_octets[offset+num_content_octets-1-i] = content_octets[offset+i];
/* pse 1/16/96 if we have the value encoded and the leading encoding bit is set
then stuff in a leading zero byte */
lead = (int)net_octets[offset];
if ((m_value > 0) && ((lead & 0x80) > 0)) {
offset = 0;
net_octets[offset] = (byte)0x00;
num_content_octets++;
}
}
stream.write(getType());
sendDefiniteLength(stream, num_content_octets);
stream.write(net_octets,offset,num_content_octets); /* contents */
}
/**
* Gets the integral value.
* @return element value.
*/
public int getValue() {
return m_value;
}
/**
* Gets the element type.
* @return element type.
*/
public abstract int getType();
/**
* Gets the string representation.
* @return string representation of tag.
*/
public abstract String toString();
}
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