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); } } }