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/* see bouncycastle_license.txt */
package com.lowagie.bc.asn1;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
public class BERConstructedOctetString
extends DEROctetString
{
/**
* convert a vector of octet strings into a single byte string
*/
static private byte[] toBytes(
Vector octs)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
for (int i = 0; i != octs.size(); i++)
{
DEROctetString o = (DEROctetString)octs.elementAt(i);
try
{
bOut.write(o.getOctets());
}
catch (IOException e)
{
throw new RuntimeException("exception converting octets " + e.toString());
}
}
return bOut.toByteArray();
}
private Vector octs;
/**
* @param string the octets making up the octet string.
*/
public BERConstructedOctetString(
byte[] string)
{
super(string);
}
public BERConstructedOctetString(
Vector octs)
{
super(toBytes(octs));
this.octs = octs;
}
public BERConstructedOctetString(
DERObject obj)
{
super(obj);
}
public BERConstructedOctetString(
DEREncodable obj)
{
super(obj.getDERObject());
}
public byte[] getOctets()
{
return string;
}
/**
* return the DER octets that make up this string.
*/
public Enumeration getObjects()
{
if (octs == null)
{
return generateOcts().elements();
}
return octs.elements();
}
private Vector generateOcts()
{
int start = 0;
int end = 0;
Vector vec = new Vector();
while ((end + 1) < string.length)
{
if (string[end] == 0 && string[end + 1] == 0)
{
byte[] nStr = new byte[end - start + 1];
System.arraycopy(string, start, nStr, 0, nStr.length);
vec.addElement(new DEROctetString(nStr));
start = end + 1;
}
end++;
}
byte[] nStr = new byte[string.length - start];
System.arraycopy(string, start, nStr, 0, nStr.length);
vec.addElement(new DEROctetString(nStr));
return vec;
}
public void encode(
DEROutputStream out)
throws IOException
{
if (out instanceof ASN1OutputStream || out instanceof BEROutputStream)
{
out.write(CONSTRUCTED | OCTET_STRING);
out.write(0x80);
//
// write out the octet array
//
if (octs != null)
{
for (int i = 0; i != octs.size(); i++)
{
out.writeObject(octs.elementAt(i));
}
}
else
{
int start = 0;
int end = 0;
while ((end + 1) < string.length)
{
if (string[end] == 0 && string[end + 1] == 0)
{
byte[] nStr = new byte[end - start + 1];
System.arraycopy(string, start, nStr, 0, nStr.length);
out.writeObject(new DEROctetString(nStr));
start = end + 1;
}
end++;
}
byte[] nStr = new byte[string.length - start];
System.arraycopy(string, start, nStr, 0, nStr.length);
out.writeObject(new DEROctetString(nStr));
}
out.write(0x00);
out.write(0x00);
}
else
{
super.encode(out);
}
}
}
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