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| 1 | <!DOCTYPE html> | |
| 2 | ||
| 3 | <html lang="en"> | |
| 4 | <head> | |
| 5 | <meta charset="utf-8" /> | |
| 6 | <title>German Tax Generator</title> | |
| 7 | <meta name="author" content="JavaScript: Jonas Pfeil"> | |
| 8 | <meta name="author" content="Original: Martin Wolters"> | |
| 9 | <script> | |
| 10 | var MIXFACT=256; | |
| 11 | //Code from http://www.naden.de/blog/zufallszahlen-in-javascript-mit-mathrandom | |
| 12 | function rrand(min, max) {
| |
| 13 | if(min > max) {
| |
| 14 | return -1; | |
| 15 | } | |
| 16 | if(min == max) {
| |
| 17 | return min; | |
| 18 | } | |
| 19 | var r; | |
| 20 | do {
| |
| 21 | r = Math.random(); | |
| 22 | } | |
| 23 | while(r == 1.0); | |
| 24 | return min + parseInt(r * (max-min+1)); | |
| 25 | } | |
| 26 | function checksum(id) {
| |
| 27 | var out; | |
| 28 | var i, sum = 0, prod = 10; | |
| 29 | ||
| 30 | for(i = 0; i < 10; i++) {
| |
| 31 | sum = (id[i] + prod) % 10; | |
| 32 | if(sum == 0) | |
| 33 | sum = 10; | |
| 34 | prod = (sum * 2) % 11; | |
| 35 | } | |
| 36 | out = 11 - prod; | |
| 37 | if(out == 10) | |
| 38 | out = 0; | |
| 39 | return out; | |
| 40 | } | |
| 41 | function mix(id) {
| |
| 42 | var i, pos1, pos2; | |
| 43 | var buf; | |
| 44 | for(i = 0; i < MIXFACT; i++) {
| |
| 45 | pos1 = rrand(0,9); | |
| 46 | do {
| |
| 47 | pos2 = rrand(0,9); | |
| 48 | } while(pos1 == pos2); | |
| 49 | buf = id[pos1]; | |
| 50 | id[pos1] = id[pos2]; | |
| 51 | id[pos2] = buf; | |
| 52 | } | |
| 53 | pos1 = rrand(0,9); | |
| 54 | do {
| |
| 55 | pos2 = rrand(0,9); | |
| 56 | } while(pos1 == pos2); | |
| 57 | id[pos1] = id[pos2]; | |
| 58 | } | |
| 59 | function generateTaxId(){
| |
| 60 | var id=[0,1,2,3,4,5,6,7,8,9]; | |
| 61 | mix(id); | |
| 62 | var ret=""; | |
| 63 | for(var i=0;i<10;++i) | |
| 64 | ret+=id[i]; | |
| 65 | ret+=checksum(id); | |
| 66 | return ret; | |
| 67 | } | |
| 68 | </script> | |
| 69 | <style> | |
| 70 | #license | |
| 71 | {
| |
| 72 | display:none; | |
| 73 | width:12cm; | |
| 74 | text-align:justify; | |
| 75 | } | |
| 76 | </style> | |
| 77 | </head> | |
| 78 | <body> | |
| 79 | <input type="text"><input type="button" onclick="this.previousSibling.value=generateTaxId()" value="Generate Tax ID"><br> | |
| 80 | <input type="button" onclick="this.nextSibling.style.display='block'" value="License"><div id="license"> | |
| 81 | <p>Copyright (C) 2012 Martin Wolters, Jonas Pfeil</p> | |
| 82 | <p>This program is free software; you can redistribute it and/or | |
| 83 | - | modify it under the terms of the GNU General Public License |
| 83 | + | modify it under the terms of the <a href="http://www.gnu.org/licenses/gpl-2.0.txt">GNU General Public License</a> |
| 84 | as published by the Free Software Foundation; either version 2 | |
| 85 | of the License, or (at your option) any later version.</p> | |
| 86 | ||
| 87 | <p>This program is distributed in the hope that it will be useful, | |
| 88 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 89 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 90 | GNU General Public License for more details.</p> | |
| 91 | ||
| 92 | <p>You should have received a copy of the GNU General Public License | |
| 93 | along with this program; if not, write to <br> | |
| 94 | the Free Software Foundation, Inc.<br> | |
| 95 | 51 Franklin Street, Fifth Floor<br> | |
| 96 | Boston, MA 02110-1301, USA</p> | |
| 97 | </div> | |
| 98 | </body> | |
| 99 | </html> |
