2002/03/21 01:19:32

[org.ibex.core.git] / src / org / bouncycastle / asn1 / DERBitString.java

diff --git a/src/org/bouncycastle/asn1/DERBitString.java b/src/org/bouncycastle/asn1/DERBitString.java
new file mode 100644 (file)
index 0000000..0c888d5
--- /dev/null
+++ b/src/org/bouncycastle/asn1/DERBitString.java
@@ -0,0 +1,85 @@
+package org.bouncycastle.asn1;
+
+import java.io.*;
+
+public class DERBitString
+    extends DERObject
+{
+    protected byte[]      data;
+    protected int         padBits;
+
+    protected DERBitString(
+        byte    data,
+        int     padBits)
+    {
+        this.data = new byte[1];
+        this.data[0] = data;
+        this.padBits = padBits;
+    }
+
+    /**
+     * @param data the octets making up the bit string.
+     * @param padBits the number of extra bits at the end of the string.
+     */
+    public DERBitString(
+        byte[]  data,
+        int     padBits)
+    {
+        this.data = data;
+        this.padBits = padBits;
+    }
+
+    public DERBitString(
+        byte[]  data)
+    {
+        this(data, 0);
+    }
+
+    public DERBitString(
+        DERObject  obj)
+    {
+        try
+        {
+            ByteArrayOutputStream   bOut = new ByteArrayOutputStream();
+            DEROutputStream         dOut = new DEROutputStream(bOut);
+
+            dOut.writeObject(obj);
+            dOut.close();
+
+            this.data = bOut.toByteArray();
+            this.padBits = 0;
+        }
+        catch (IOException e)
+        {
+            throw new IllegalArgumentException("Error processing object : " + e.toString());
+        }
+    }
+
+    public DERBitString(
+        DEREncodable  obj)
+    {
+        this(obj.getDERObject());
+    }
+
+    public byte[] getBytes()
+    {
+        return data;
+    }
+
+    public int getPadBits()
+    {
+        return padBits;
+    }
+
+    void encode(
+        DEROutputStream  out)
+        throws IOException
+    {
+        byte[]  bytes = new byte[getBytes().length + 1];
+
+        bytes[0] = (byte)getPadBits();
+        System.arraycopy(getBytes(), 0, bytes, 1, bytes.length - 1);
+
+        out.writeEncoded(BIT_STRING, bytes);
+    }
+}