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diff --git a/src/org/mozilla/javascript/BinaryDigitReader.java b/src/org/mozilla/javascript/BinaryDigitReader.java
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+++ b/src/org/mozilla/javascript/BinaryDigitReader.java
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+
+/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * The contents of this file are subject to the Netscape Public
+ * License Version 1.1 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.mozilla.org/NPL/
+ *
+ * Software distributed under the License is distributed on an "AS
+ * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
+ * implied. See the License for the specific language governing
+ * rights and limitations under the License.
+ *
+ * The Original Code is Rhino code, released
+ * May 6, 1999.
+ *
+ * The Initial Developer of the Original Code is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 1997-1999 Netscape Communications Corporation. All
+ * Rights Reserved.
+ *
+ * Contributor(s): 
+ * Waldemar Horwat
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU Public License (the "GPL"), in which case the
+ * provisions of the GPL are applicable instead of those above.
+ * If you wish to allow use of your version of this file only
+ * under the terms of the GPL and not to allow others to use your
+ * version of this file under the NPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL.  If you do not delete
+ * the provisions above, a recipient may use your version of this
+ * file under either the NPL or the GPL.
+ */
+package org.mozilla.javascript;
+
+final class BinaryDigitReader {
+    int lgBase;			// Logarithm of base of number
+    int digit;			// Current digit value in radix given by base
+    int digitPos;		// Bit position of last bit extracted from digit
+    String digits;		// String containing the digits
+    int start;			// Index of the first remaining digit
+    int end;			// Index past the last remaining digit
+
+    BinaryDigitReader(int base, String digits, int start, int end) {
+        lgBase = 0;
+        while (base != 1) {
+            lgBase++;
+            base >>= 1;
+        }
+        digitPos = 0;
+        this.digits = digits;
+        this.start = start;
+        this.end = end;
+    }
+
+    /* Return the next binary digit from the number or -1 if done */
+    int getNextBinaryDigit()
+    {
+        if (digitPos == 0) {
+            if (start == end)
+                return -1;
+    
+            char c = digits.charAt(start++);
+            if ('0' <= c && c <= '9')
+                digit = c - '0';
+            else if ('a' <= c && c <= 'z')
+                digit = c - 'a' + 10;
+            else digit = c - 'A' + 10;
+            digitPos = lgBase;
+        }
+        return digit >> --digitPos & 1;
+    }
+}