From fe6c36e18042603bb096d3685fe3988e32331ebf Mon Sep 17 00:00:00 2001 From: haturatu Date: Tue, 10 Dec 2024 21:28:04 +0900 Subject: first commit --- README.md | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 README.md (limited to 'README.md') diff --git a/README.md b/README.md new file mode 100644 index 0000000..731eaaa --- /dev/null +++ b/README.md @@ -0,0 +1,75 @@ +basE91 - converting binary data to ASCII text +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +Copyright (c) 2000-2006 Joachim Henke + + +basE91 is an advanced method for encoding binary data as ASCII characters. It +is similar to UUencode or base64, but is more efficient. The overhead produced +by basE91 depends on the input data. It amounts at most to 23% (versus 33% for +base64) and can range down to 14%, which typically occurs on 0-byte blocks. +This makes basE91 very useful for transferring larger files over binary +insecure connections like e-mail or terminal lines. + +The current algorithm has been written with portability and simplicity in mind +an is therefore not necessarily optimised for speed. + + +* Alphabet + +As the name suggests, basE91 needs 91 characters to represent the encoded +binary data in ASCII. From the 94 printable ASCII characters (0x21-0x7E), the +following three ones have been omitted to build the basE91 alphabet: + +- (dash, 0x2D) +' (apostrophe, 0x27) +\ (backslash, 0x5C) + +The translation table is composed of the remaining characters as shown below. + + 0 A 13 N 26 a 39 n 52 0 65 % 78 > + 1 B 14 O 27 b 40 o 53 1 66 & 79 ? + 2 C 15 P 28 c 41 p 54 2 67 ( 80 @ + 3 D 16 Q 29 d 42 q 55 3 68 ) 81 [ + 4 E 17 R 30 e 43 r 56 4 69 * 82 ] + 5 F 18 S 31 f 44 s 57 5 70 + 83 ^ + 6 G 19 T 32 g 45 t 58 6 71 , 84 _ + 7 H 20 U 33 h 46 u 59 7 72 . 85 ` + 8 I 21 V 34 i 47 v 60 8 73 / 86 { + 9 J 22 W 35 j 48 w 61 9 74 : 87 | +10 K 23 X 36 k 49 x 62 ! 75 ; 88 } +11 L 24 Y 37 l 50 y 63 # 76 < 89 ~ +12 M 25 Z 38 m 51 z 64 $ 77 = 90 " + + +* Building + +1. `cd' to the directory containing the package's source code and type `make' + to compile the package + +2. optionally, type `make check' to run any self-tests that come with the + package + +3. type `make install' to install the program and documentation in `/usr/local' + (to specify another installation prefix than `/usr/local', type + `make prefix=PATH install' instead) + +4. you can remove the program binaries and object files from the source code + directory by typing `make clean' + + +* Developer + +Joachim Henke + + +* Copying + +All source code in this package is released under the terms of the BSD license. +See the file LICENSE for copying permission. + + +* See also + +Please visit the basE91 home page [http://base91.sourceforge.net/] for the +latest version and pre-compiled binaries. -- cgit v1.2.3