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Base64 decoder function for Oracle 8.1.7

Posted on 2005-03-30
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Does anyone have a Oracle function that can decode Base64?  I have Oracle 8.1.7.
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Question by:Guyver00
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MikeOM_DBA earned 2000 total points
ID: 13665331
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;
Begin
  N:=Length(B64);  
  For I In Reverse 1..Length(Val) Loop  
    J:=Instr(B64,Substr(Val,I,1))-1;
    If J <0 Then
      Raise_Application_Error(-20001,'Invalid Base 64 Number: '||Val);
    End If;
    V_Out:=V_Out+J*(N**K);
    K:=K+1;
  End Loop;
  Return V_Out;
End;    

Function Dec2_Base64
(Val Number)
Return Varchar2 Is
V_In Number;
N Pls_Integer;
V_Out Varchar2(30):='';
Begin
  N:=Length(B64);  
  V_In:=Trunc(Val);
  While (V_In>0) Loop  
    V_Out:=Substr(B64,Mod(V_In,N)+1,1)||V_Out;
    V_In:=Trunc(V_In/N);
  End Loop;
  Return V_Out;
End;    

End B64;    
/
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by:riazpk
ID: 13669211
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