1 PACKAGE BODY OKS_BASE64 AS
2 /* $Header: OKSBASEB.pls 120.0 2005/05/25 18:01:54 appldev noship $ */
3
4 TYPE vc2_table IS TABLE OF VARCHAR2(1) INDEX BY BINARY_INTEGER;
5 map vc2_table;
6
7 -- Initialize the Base64 mapping
8 PROCEDURE init_map IS
9 BEGIN
10 map(0) :='A'; map(1) :='B'; map(2) :='C'; map(3) :='D'; map(4) :='E';
11 map(5) :='F'; map(6) :='G'; map(7) :='H'; map(8) :='I'; map(9):='J';
12 map(10):='K'; map(11):='L'; map(12):='M'; map(13):='N'; map(14):='O';
13 map(15):='P'; map(16):='Q'; map(17):='R'; map(18):='S'; map(19):='T';
14 map(20):='U'; map(21):='V'; map(22):='W'; map(23):='X'; map(24):='Y';
15 map(25):='Z'; map(26):='a'; map(27):='b'; map(28):='c'; map(29):='d';
16 map(30):='e'; map(31):='f'; map(32):='g'; map(33):='h'; map(34):='i';
17 map(35):='j'; map(36):='k'; map(37):='l'; map(38):='m'; map(39):='n';
18 map(40):='o'; map(41):='p'; map(42):='q'; map(43):='r'; map(44):='s';
19 map(45):='t'; map(46):='u'; map(47):='v'; map(48):='w'; map(49):='x';
20 map(50):='y'; map(51):='z'; map(52):='0'; map(53):='1'; map(54):='2';
21 map(55):='3'; map(56):='4'; map(57):='5'; map(58):='6'; map(59):='7';
22 map(60):='8'; map(61):='9'; map(62):='+'; map(63):='/';
23 END;
24
25 FUNCTION encode(r IN RAW) RETURN VARCHAR2 IS
26 i pls_integer;
27 x pls_integer;
28 y pls_integer;
29 v VARCHAR2(32767);
30 BEGIN
31
32 -- For every 3 bytes, split them into 4 6-bit units and map them to
33 -- the Base64 characters
34 i := 1;
35 WHILE ( i + 2 <= utl_raw.length(r) ) LOOP
36 x := to_number(utl_raw.substr(r, i, 1), '0X') * 65536 +
37 to_number(utl_raw.substr(r, i + 1, 1), '0X') * 256 +
38 to_number(utl_raw.substr(r, i + 2, 1), '0X');
39 y := floor(x / 262144); v := v || map(y); x := x - y * 262144;
40 y := floor(x / 4096); v := v || map(y); x := x - y * 4096;
41 y := floor(x / 64); v := v || map(y); x := x - y * 64;
42 v := v || map(x);
43 i := i + 3;
44 END LOOP;
45
46 -- Process the remaining bytes that has fewer than 3 bytes.
47 IF ( utl_raw.length(r) - i = 0) THEN
48 x := to_number(utl_raw.substr(r, i, 1), '0X');
49 y := floor(x / 4); v := v || map(y); x := x - y * 4;
50 x := x * 16; v := v || map(x);
51 v := v || '==';
52 ELSIF ( utl_raw.length(r) - i = 1) THEN
53 x := to_number(utl_raw.substr(r, i, 1), '0X') * 256 +
54 to_number(utl_raw.substr(r, i + 1, 1), '0X');
55 y := floor(x / 1024); v := v || map(y); x := x - y * 1024;
56 y := floor(x / 16); v := v || map(y); x := x - y * 16;
57 x := x * 4; v := v || map(x);
58 v := v || '=';
59 END IF;
60
61 RETURN v;
62
63 END;
64
65 BEGIN
66 init_map;
67 END;
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