1 files changed, 177 insertions, 0 deletions
diff --git a/src/main/java/com/lowagie/bc/asn1/DERUTF8String.java b/src/main/java/com/lowagie/bc/asn1/DERUTF8String.java
new file mode 100644
index 0000000..13f992b
--- /dev/null
+++ b/src/main/java/com/lowagie/bc/asn1/DERUTF8String.java
@@ -0,0 +1,177 @@
+package com.lowagie.bc.asn1;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+/**
+ * DER UTF8String object.
+ */
+public class DERUTF8String
+    extends DERObject
+    implements DERString
+{
+    String  string;
+
+    /**
+     * return an UTF8 string from the passed in object.
+     *
+     * @exception IllegalArgumentException if the object cannot be converted.
+     */
+    public static DERUTF8String getInstance(
+        Object  obj)
+    {
+        if (obj == null || obj instanceof DERUTF8String)
+        {
+            return (DERUTF8String)obj;
+        }
+
+        if (obj instanceof ASN1OctetString)
+        {
+            return new DERUTF8String(((ASN1OctetString)obj).getOctets());
+        }
+
+        if (obj instanceof ASN1TaggedObject)
+        {
+            return getInstance(((ASN1TaggedObject)obj).getObject());
+        }
+
+        throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
+    }
+
+    /**
+     * return an UTF8 String from a tagged object.
+     *
+     * @param obj the tagged object holding the object we want
+     * @param explicit true if the object is meant to be explicitly
+     *              tagged false otherwise.
+     * @exception IllegalArgumentException if the tagged object cannot
+     *               be converted.
+     */
+    public static DERUTF8String getInstance(
+        ASN1TaggedObject obj,
+        boolean          explicit)
+    {
+        return getInstance(obj.getObject());
+    }
+
+    /**
+     * basic constructor - byte encoded string.
+     */
+    DERUTF8String(
+        byte[]   string)
+    {
+        int i = 0;
+        int length = 0;
+
+        while (i < string.length)
+        {
+            length++;
+            if ((string[i] & 0xe0) == 0xe0)
+            {
+                i += 3;
+            }
+            else if ((string[i] & 0xc0) == 0xc0)
+            {
+                i += 2;
+            }
+            else
+            {
+                i += 1;
+            }
+        }
+
+        char[]  cs = new char[length];
+
+        i = 0;
+        length = 0;
+
+        while (i < string.length)
+        {
+            char    ch;
+
+            if ((string[i] & 0xe0) == 0xe0)
+            {
+                ch = (char)(((string[i] & 0x1f) << 12)
+                      | ((string[i + 1] & 0x3f) << 6) | (string[i + 2] & 0x3f));
+                i += 3;
+            }
+            else if ((string[i] & 0xc0) == 0xc0)
+            {
+                ch = (char)(((string[i] & 0x3f) << 6) | (string[i + 1] & 0x3f));
+                i += 2;
+            }
+            else
+            {
+                ch = (char)(string[i] & 0xff);
+                i += 1;
+            }
+
+            cs[length++] = ch;
+        }
+
+        this.string = new String(cs);
+    }
+
+    /**
+     * basic constructor
+     */
+    public DERUTF8String(
+        String   string)
+    {
+        this.string = string;
+    }
+
+    public String getString()
+    {
+        return string;
+    }
+
+    public int hashCode()
+    {
+        return this.getString().hashCode();
+    }
+
+    public boolean equals(
+        Object  o)
+    {
+        if (!(o instanceof DERUTF8String))
+        {
+            return false;
+        }
+
+        DERUTF8String  s = (DERUTF8String)o;
+
+        return this.getString().equals(s.getString());
+    }
+
+    void encode(
+        DEROutputStream  out)
+        throws IOException
+    {
+        char[]                  c = string.toCharArray();
+        ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
+
+        for (int i = 0; i != c.length; i++)
+        {
+            char    ch = c[i];
+
+            if (ch < 0x0080)
+            {
+                bOut.write(ch);
+            }
+            else if (ch < 0x0800)
+            {
+                bOut.write(0xc0 | (ch >> 6));
+                bOut.write(0x80 | (ch & 0x3f));
+            }
+            else
+            {
+                bOut.write(0xe0 | (ch >> 12));
+                bOut.write(0x80 | ((ch >> 6) & 0x3F));
+                bOut.write(0x80 | (ch & 0x3F));
+            }
+        }
+
+        out.writeEncoded(UTF8_STRING, bOut.toByteArray());
+    }
+}