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diff --git a/lib/libc/include/plbase64.h b/lib/libc/include/plbase64.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla 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/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef _plbase64_h
+#define _plbase64_h
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+
+/*
+ * PL_Base64Encode
+ *
+ * This routine encodes the data pointed to by the "src" parameter using the
+ * base64 algorithm, and returns a pointer to the result.  If the "srclen"
+ * parameter is not zero, it specifies the length of the source data.  If it
+ * is zero, the source data is assumed to be null-terminated, and PL_strlen
+ * is used to determine the source length.  If the "dest" parameter is not
+ * null, it is assumed to point to a buffer of sufficient size (which may be
+ * calculated: ((srclen + 2)/3)*4) into which the encoded data is placed 
+ * (without any termination).  If the "dest" parameter is null, a buffer is
+ * allocated from the heap to hold the encoded data, and the result *will*
+ * be terminated with an extra null character.  It is the caller's 
+ * responsibility to free the result when it is allocated.  A null is returned 
+ * if the allocation fails.
+ *
+ * NOTE: when calculating ((srclen + 2)/3)*4), first ensure that
+ *     srclen <= (PR_UINT32_MAX/4) * 3
+ * to avoid PRUint32 overflow.
+ */
+
+PR_EXTERN(char *)
+PL_Base64Encode
+(
+    const char *src,
+    PRUint32    srclen,
+    char       *dest
+);
+
+/*
+ * PL_Base64Decode
+ *
+ * This routine decodes the data pointed to by the "src" parameter using
+ * the base64 algorithm, and returns a pointer to the result.  The source
+ * may either include or exclude any trailing '=' characters.  If the
+ * "srclen" parameter is not zero, it specifies the length of the source
+ * data.  If it is zero, PL_strlen will be used to determine the source
+ * length.  If the "dest" parameter is not null, it is assumed to point to
+ * a buffer of sufficient size (which may be calculated: (srclen * 3)/4
+ * when srclen includes the '=' characters) into which the decoded data
+ * is placed (without any termination).  If the "dest" parameter is null,
+ * a buffer is allocated from the heap to hold the decoded data, and the
+ * result *will* be terminated with an extra null character.  It is the
+ * caller's responsibility to free the result when it is allocated.  A null
+ * is retuned if the allocation fails, or if the source is not well-coded.
+ *
+ * NOTE: when calculating (srclen * 3)/4, first ensure that 
+ *     srclen <= PR_UINT32_MAX/3
+ * to avoid PRUint32 overflow.  Alternatively, calculate
+ *     (srclen/4) * 3 + ((srclen%4) * 3)/4
+ * which is equivalent but doesn't overflow for any value of srclen.
+ */
+
+PR_EXTERN(char *)
+PL_Base64Decode
+(
+    const char *src,
+    PRUint32    srclen,
+    char       *dest
+);
+
+PR_END_EXTERN_C
+
+#endif /* _plbase64_h */