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1 basE91 - converting binary data to ASCII text
2 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3
4 Copyright (c) 2000-2006 Joachim Henke
5
6
7 basE91 is an advanced method for encoding binary data as ASCII characters. It
8 is similar to UUencode or base64, but is more efficient. The overhead produced
9 by basE91 depends on the input data. It amounts at most to 23% (versus 33% for
10 base64) and can range down to 14%, which typically occurs on 0-byte blocks.
11 This makes basE91 very useful for transferring larger files over binary
12 insecure connections like e-mail or terminal lines.
13
14 The current algorithm has been written with portability and simplicity in mind
15 an is therefore not necessarily optimised for speed.
16
17
18 * Alphabet
19
20 As the name suggests, basE91 needs 91 characters to represent the encoded
21 binary data in ASCII. From the 94 printable ASCII characters (0x21-0x7E), the
22 following three ones have been omitted to build the basE91 alphabet:
23
24 - (dash, 0x2D)
25 ' (apostrophe, 0x27)
26 \ (backslash, 0x5C)
27
28 The translation table is composed of the remaining characters as shown below.
29
30 0 A 13 N 26 a 39 n 52 0 65 % 78 >
31 1 B 14 O 27 b 40 o 53 1 66 & 79 ?
32 2 C 15 P 28 c 41 p 54 2 67 ( 80 @
33 3 D 16 Q 29 d 42 q 55 3 68 ) 81 [
34 4 E 17 R 30 e 43 r 56 4 69 * 82 ]
35 5 F 18 S 31 f 44 s 57 5 70 + 83 ^
36 6 G 19 T 32 g 45 t 58 6 71 , 84 _
37 7 H 20 U 33 h 46 u 59 7 72 . 85 `
38 8 I 21 V 34 i 47 v 60 8 73 / 86 {
39 9 J 22 W 35 j 48 w 61 9 74 : 87 |
40 10 K 23 X 36 k 49 x 62 ! 75 ; 88 }
41 11 L 24 Y 37 l 50 y 63 # 76 < 89 ~
42 12 M 25 Z 38 m 51 z 64 $ 77 = 90 "
43
44
45 * Building
46
47 1. `cd' to the directory containing the package's source code and type `make'
48 to compile the package
49
50 2. optionally, type `make check' to run any self-tests that come with the
51 package
52
53 3. type `make install' to install the program and documentation in `/usr/local'
54 (to specify another installation prefix than `/usr/local', type
55 `make prefix=PATH install' instead)
56
57 4. you can remove the program binaries and object files from the source code
58 directory by typing `make clean'
59
60
61 * Developer
62
63 Joachim Henke <j-o@users.sourceforge.net>
64
65
66 * Copying
67
68 All source code in this package is released under the terms of the BSD license.
69 See the file LICENSE for copying permission.
70
71
72 * See also
73
74 Please visit the basE91 home page [http://base91.sourceforge.net/] for the
75 latest version and pre-compiled binaries.
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