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package org.spongycastle.asn1;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Vector;
public class BEROctetString
extends ASN1OctetString
{
private static final int MAX_LENGTH = 1000;
private ASN1OctetString[] octs;
/**
* convert a vector of octet strings into a single byte string
*/
static private byte[] toBytes(
ASN1OctetString[] octs)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
for (int i = 0; i != octs.length; i++)
{
try
{
DEROctetString o = (DEROctetString)octs[i];
bOut.write(o.getOctets());
}
catch (ClassCastException e)
{
throw new IllegalArgumentException(octs[i].getClass().getName() + " found in input should only contain DEROctetString");
}
catch (IOException e)
{
throw new IllegalArgumentException("exception converting octets " + e.toString());
}
}
return bOut.toByteArray();
}
/**
* @param string the octets making up the octet string.
*/
public BEROctetString(
byte[] string)
{
super(string);
}
public BEROctetString(
ASN1OctetString[] octs)
{
super(toBytes(octs));
this.octs = octs;
}
public byte[] getOctets()
{
return string;
}
/**
* return the DER octets that make up this string.
*/
public Enumeration getObjects()
{
if (octs == null)
{
return generateOcts().elements();
}
return new Enumeration()
{
int counter = 0;
public boolean hasMoreElements()
{
return counter < octs.length;
}
public Object nextElement()
{
return octs[counter++];
}
};
}
private Vector generateOcts()
{
Vector vec = new Vector();
for (int i = 0; i < string.length; i += MAX_LENGTH)
{
int end;
if (i + MAX_LENGTH > string.length)
{
end = string.length;
}
else
{
end = i + MAX_LENGTH;
}
byte[] nStr = new byte[end - i];
System.arraycopy(string, i, nStr, 0, nStr.length);
vec.addElement(new DEROctetString(nStr));
}
return vec;
}
boolean isConstructed()
{
return true;
}
int encodedLength()
throws IOException
{
int length = 0;
for (Enumeration e = getObjects(); e.hasMoreElements();)
{
length += ((ASN1Encodable)e.nextElement()).toASN1Primitive().encodedLength();
}
return 2 + length + 2;
}
public void encode(
ASN1OutputStream out)
throws IOException
{
out.write(BERTags.CONSTRUCTED | BERTags.OCTET_STRING);
out.write(0x80);
//
// write out the octet array
//
for (Enumeration e = getObjects(); e.hasMoreElements();)
{
out.writeObject((ASN1Encodable)e.nextElement());
}
out.write(0x00);
out.write(0x00);
}
static BEROctetString fromSequence(ASN1Sequence seq)
{
ASN1OctetString[] v = new ASN1OctetString[seq.size()];
Enumeration e = seq.getObjects();
int index = 0;
while (e.hasMoreElements())
{
v[index++] = (ASN1OctetString)e.nextElement();
}
return new BEROctetString(v);
}
}
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