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      1 package org.bouncycastle.asn1;
      2 
      3 import java.io.ByteArrayOutputStream;
      4 import java.io.IOException;
      5 
      6 import org.bouncycastle.util.Arrays;
      7 
      8 /**
      9  * DER UniversalString object.
     10  */
     11 public class DERUniversalString
     12     extends ASN1Primitive
     13     implements ASN1String
     14 {
     15     private static final char[]  table = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
     16     private final byte[] string;
     17 
     18     /**
     19      * return a Universal String from the passed in object.
     20      *
     21      * @param obj a DERUniversalString or an object that can be converted into one.
     22      * @exception IllegalArgumentException if the object cannot be converted.
     23      * @return a DERUniversalString instance, or null
     24      */
     25     public static DERUniversalString getInstance(
     26         Object  obj)
     27     {
     28         if (obj == null || obj instanceof DERUniversalString)
     29         {
     30             return (DERUniversalString)obj;
     31         }
     32 
     33         if (obj instanceof byte[])
     34         {
     35             try
     36             {
     37                 return (DERUniversalString)fromByteArray((byte[])obj);
     38             }
     39             catch (Exception e)
     40             {
     41                 throw new IllegalArgumentException("encoding error getInstance: " + e.toString());
     42             }
     43         }
     44 
     45         throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
     46     }
     47 
     48     /**
     49      * return a Universal String from a tagged object.
     50      *
     51      * @param obj the tagged object holding the object we want
     52      * @param explicit true if the object is meant to be explicitly
     53      *              tagged false otherwise.
     54      * @exception IllegalArgumentException if the tagged object cannot
     55      *               be converted.
     56      * @return a DERUniversalString instance, or null
     57      */
     58     public static DERUniversalString getInstance(
     59         ASN1TaggedObject obj,
     60         boolean          explicit)
     61     {
     62         ASN1Primitive o = obj.getObject();
     63 
     64         if (explicit || o instanceof DERUniversalString)
     65         {
     66             return getInstance(o);
     67         }
     68         else
     69         {
     70             return new DERUniversalString(((ASN1OctetString)o).getOctets());
     71         }
     72     }
     73 
     74     /**
     75      * basic constructor - byte encoded string.
     76      *
     77      * @param string the byte encoding of the string to be carried in the UniversalString object,
     78      */
     79     public DERUniversalString(
     80         byte[]   string)
     81     {
     82         this.string = Arrays.clone(string);
     83     }
     84 
     85     public String getString()
     86     {
     87         StringBuffer    buf = new StringBuffer("#");
     88         ByteArrayOutputStream    bOut = new ByteArrayOutputStream();
     89         ASN1OutputStream            aOut = new ASN1OutputStream(bOut);
     90 
     91         try
     92         {
     93             aOut.writeObject(this);
     94         }
     95         catch (IOException e)
     96         {
     97            throw new ASN1ParsingException("internal error encoding BitString");
     98         }
     99 
    100         byte[]    string = bOut.toByteArray();
    101 
    102         for (int i = 0; i != string.length; i++)
    103         {
    104             buf.append(table[(string[i] >>> 4) & 0xf]);
    105             buf.append(table[string[i] & 0xf]);
    106         }
    107 
    108         return buf.toString();
    109     }
    110 
    111     public String toString()
    112     {
    113         return getString();
    114     }
    115 
    116     public byte[] getOctets()
    117     {
    118         return Arrays.clone(string);
    119     }
    120 
    121     boolean isConstructed()
    122     {
    123         return false;
    124     }
    125 
    126     int encodedLength()
    127     {
    128         return 1 + StreamUtil.calculateBodyLength(string.length) + string.length;
    129     }
    130 
    131     void encode(
    132         ASN1OutputStream out)
    133         throws IOException
    134     {
    135         out.writeEncoded(BERTags.UNIVERSAL_STRING, this.getOctets());
    136     }
    137 
    138     boolean asn1Equals(
    139         ASN1Primitive o)
    140     {
    141         if (!(o instanceof DERUniversalString))
    142         {
    143             return false;
    144         }
    145 
    146         return Arrays.areEqual(string, ((DERUniversalString)o).string);
    147     }
    148 
    149     public int hashCode()
    150     {
    151         return Arrays.hashCode(string);
    152     }
    153 }
    154