Script Library: 1213 scripts
 

base58.r

REBOL [ Title: "Encode/Decode Base58" Date: 5-Dec-2009 Author: "Christopher Ross-Gill" File: %base58.r Version: 1.0.0 Home: http://www.ross-gill.com/ Purpose: { To Encode Integers as Base58. Used by some URL shortening services. } Library: [ level: 'intermediate platform: 'all type: [function module] domain: [web] tested-under: [view 2.7.6.2.4 view 2.100.95.2.5] license: 'cc-by-sa ] Example: [ probe "nh" = to-base58 1234 probe 1234 = load-base58 "nh" browse join http://flic.kr/p/ to-base58 #2740009121 ] ] to-base58: use [ch out][ ch: "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ" func [id [number! issue!]][ id: load form id out: copy "" while [id > 0][ insert out ch/(round id // 58 + 1) id: to-integer id / 58 ] out ] ] load-base58: use [out ch os][ ch: "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ" os: [ 1 58 3364 195112 11316496 656356768 38068692544 2207984167552 128063081718016 7427658739644928 ] func [id [string! issue!]][ out: 0 foreach dg id [insert id: [] -1 + index? find/case ch dg] forall id [out: os/(index? id) * id/1 + out] ] ]
halt ;; to terminate script if DO'ne from webpage