Base64 decoder function for Oracle 8.1.7

Does anyone have a Oracle function that can decode Base64?  I have Oracle 8.1.7.
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Here is a package you can use:

Create Or Replace Package B64 Is
B64 Varchar2(64):='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
Function Base64_2Dec(Val Varchar2) Return Number;
Function Dec2_Base64(Val Number) Return Varchar2;
End B64;
Create Or Replace Package Body B64 Is
Function Base64_2Dec
(Val Varchar2)
Return Number Is
I Pls_Integer;
J Pls_Integer;
K Pls_Integer:=0;
N Pls_Integer;
V_Out Number(38):=0;
  For I In Reverse 1..Length(Val) Loop  
    If J <0 Then
      Raise_Application_Error(-20001,'Invalid Base 64 Number: '||Val);
    End If;
  End Loop;
  Return V_Out;

Function Dec2_Base64
(Val Number)
Return Varchar2 Is
V_In Number;
N Pls_Integer;
V_Out Varchar2(30):='';
  While (V_In>0) Loop  
  End Loop;
  Return V_Out;

End B64;    

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