base64_utf8 7.7 KB

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  1. ;(function (global, factory) {
  2. typeof exports === 'object' && typeof module !== 'undefined'
  3. ? module.exports = factory(global)
  4. : typeof define === 'function' && define.amd
  5. ? define(factory) : factory(global)
  6. }((
  7. typeof self !== 'undefined' ? self
  8. : typeof window !== 'undefined' ? window
  9. : typeof global !== 'undefined' ? global
  10. : this
  11. ), function(global) {
  12. 'use strict';
  13. // existing version for noConflict()
  14. var _Base64 = global.Base64;
  15. var version = "2.4.3";
  16. // if node.js, we use Buffer
  17. var buffer;
  18. if (typeof module !== 'undefined' && module.exports) {
  19. try {
  20. buffer = require('buffer').Buffer;
  21. } catch (err) {}
  22. }
  23. // constants
  24. var b64chars
  25. = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
  26. var b64tab = function(bin) {
  27. var t = {};
  28. for (var i = 0, l = bin.length; i < l; i++) t[bin.charAt(i)] = i;
  29. return t;
  30. }(b64chars);
  31. var fromCharCode = String.fromCharCode;
  32. // encoder stuff
  33. var cb_utob = function(c) {
  34. if (c.length < 2) {
  35. var cc = c.charCodeAt(0);
  36. return cc < 0x80 ? c
  37. : cc < 0x800 ? (fromCharCode(0xc0 | (cc >>> 6))
  38. + fromCharCode(0x80 | (cc & 0x3f)))
  39. : (fromCharCode(0xe0 | ((cc >>> 12) & 0x0f))
  40. + fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
  41. + fromCharCode(0x80 | ( cc & 0x3f)));
  42. } else {
  43. var cc = 0x10000
  44. + (c.charCodeAt(0) - 0xD800) * 0x400
  45. + (c.charCodeAt(1) - 0xDC00);
  46. return (fromCharCode(0xf0 | ((cc >>> 18) & 0x07))
  47. + fromCharCode(0x80 | ((cc >>> 12) & 0x3f))
  48. + fromCharCode(0x80 | ((cc >>> 6) & 0x3f))
  49. + fromCharCode(0x80 | ( cc & 0x3f)));
  50. }
  51. };
  52. var re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
  53. var utob = function(u) {
  54. return u.replace(re_utob, cb_utob);
  55. };
  56. var cb_encode = function(ccc) {
  57. var padlen = [0, 2, 1][ccc.length % 3],
  58. ord = ccc.charCodeAt(0) << 16
  59. | ((ccc.length > 1 ? ccc.charCodeAt(1) : 0) << 8)
  60. | ((ccc.length > 2 ? ccc.charCodeAt(2) : 0)),
  61. chars = [
  62. b64chars.charAt( ord >>> 18),
  63. b64chars.charAt((ord >>> 12) & 63),
  64. padlen >= 2 ? '=' : b64chars.charAt((ord >>> 6) & 63),
  65. padlen >= 1 ? '=' : b64chars.charAt(ord & 63)
  66. ];
  67. return chars.join('');
  68. };
  69. var btoa = global.btoa ? function(b) {
  70. return global.btoa(b);
  71. } : function(b) {
  72. return b.replace(/[\s\S]{1,3}/g, cb_encode);
  73. };
  74. var _encode = buffer ?
  75. buffer.from && buffer.from !== Uint8Array.from ? function (u) {
  76. return (u.constructor === buffer.constructor ? u : buffer.from(u))
  77. .toString('base64')
  78. }
  79. : function (u) {
  80. return (u.constructor === buffer.constructor ? u : new buffer(u))
  81. .toString('base64')
  82. }
  83. : function (u) { return btoa(utob(u)) }
  84. ;
  85. var encode = function(u, urisafe) {
  86. return !urisafe
  87. ? _encode(String(u))
  88. : _encode(String(u)).replace(/[+\/]/g, function(m0) {
  89. return m0 == '+' ? '-' : '_';
  90. }).replace(/=/g, '');
  91. };
  92. var encodeURI = function(u) { return encode(u, true) };
  93. // decoder stuff
  94. var re_btou = new RegExp([
  95. '[\xC0-\xDF][\x80-\xBF]',
  96. '[\xE0-\xEF][\x80-\xBF]{2}',
  97. '[\xF0-\xF7][\x80-\xBF]{3}'
  98. ].join('|'), 'g');
  99. var cb_btou = function(cccc) {
  100. switch(cccc.length) {
  101. case 4:
  102. var cp = ((0x07 & cccc.charCodeAt(0)) << 18)
  103. | ((0x3f & cccc.charCodeAt(1)) << 12)
  104. | ((0x3f & cccc.charCodeAt(2)) << 6)
  105. | (0x3f & cccc.charCodeAt(3)),
  106. offset = cp - 0x10000;
  107. return (fromCharCode((offset >>> 10) + 0xD800)
  108. + fromCharCode((offset & 0x3FF) + 0xDC00));
  109. case 3:
  110. return fromCharCode(
  111. ((0x0f & cccc.charCodeAt(0)) << 12)
  112. | ((0x3f & cccc.charCodeAt(1)) << 6)
  113. | (0x3f & cccc.charCodeAt(2))
  114. );
  115. default:
  116. return fromCharCode(
  117. ((0x1f & cccc.charCodeAt(0)) << 6)
  118. | (0x3f & cccc.charCodeAt(1))
  119. );
  120. }
  121. };
  122. var btou = function(b) {
  123. return b.replace(re_btou, cb_btou);
  124. };
  125. var cb_decode = function(cccc) {
  126. var len = cccc.length,
  127. padlen = len % 4,
  128. n = (len > 0 ? b64tab[cccc.charAt(0)] << 18 : 0)
  129. | (len > 1 ? b64tab[cccc.charAt(1)] << 12 : 0)
  130. | (len > 2 ? b64tab[cccc.charAt(2)] << 6 : 0)
  131. | (len > 3 ? b64tab[cccc.charAt(3)] : 0),
  132. chars = [
  133. fromCharCode( n >>> 16),
  134. fromCharCode((n >>> 8) & 0xff),
  135. fromCharCode( n & 0xff)
  136. ];
  137. chars.length -= [0, 0, 2, 1][padlen];
  138. return chars.join('');
  139. };
  140. var atob = global.atob ? function(a) {
  141. return global.atob(a);
  142. } : function(a){
  143. return a.replace(/[\s\S]{1,4}/g, cb_decode);
  144. };
  145. var _decode = buffer ?
  146. buffer.from && buffer.from !== Uint8Array.from ? function(a) {
  147. return (a.constructor === buffer.constructor
  148. ? a : buffer.from(a, 'base64')).toString();
  149. }
  150. : function(a) {
  151. return (a.constructor === buffer.constructor
  152. ? a : new buffer(a, 'base64')).toString();
  153. }
  154. : function(a) { return btou(atob(a)) };
  155. var decode = function(a){
  156. return _decode(
  157. String(a).replace(/[-_]/g, function(m0) { return m0 == '-' ? '+' : '/' })
  158. .replace(/[^A-Za-z0-9\+\/]/g, '')
  159. );
  160. };
  161. var noConflict = function() {
  162. var Base64 = global.Base64;
  163. global.Base64 = _Base64;
  164. return Base64;
  165. };
  166. // export Base64
  167. global.Base64 = {
  168. VERSION: version,
  169. atob: atob,
  170. btoa: btoa,
  171. fromBase64: decode,
  172. toBase64: encode,
  173. utob: utob,
  174. encode: encode,
  175. encodeURI: encodeURI,
  176. btou: btou,
  177. decode: decode,
  178. noConflict: noConflict
  179. };
  180. // if ES5 is available, make Base64.extendString() available
  181. if (typeof Object.defineProperty === 'function') {
  182. var noEnum = function(v){
  183. return {value:v,enumerable:false,writable:true,configurable:true};
  184. };
  185. global.Base64.extendString = function () {
  186. Object.defineProperty(
  187. String.prototype, 'fromBase64', noEnum(function () {
  188. return decode(this)
  189. }));
  190. Object.defineProperty(
  191. String.prototype, 'toBase64', noEnum(function (urisafe) {
  192. return encode(this, urisafe)
  193. }));
  194. Object.defineProperty(
  195. String.prototype, 'toBase64URI', noEnum(function () {
  196. return encode(this, true)
  197. }));
  198. };
  199. }
  200. //
  201. // export Base64 to the namespace
  202. //
  203. if (global['Meteor']) { // Meteor.js
  204. Base64 = global.Base64;
  205. }
  206. // module.exports and AMD are mutually exclusive.
  207. // module.exports has precedence.
  208. if (typeof module !== 'undefined' && module.exports) {
  209. module.exports.Base64 = global.Base64;
  210. }
  211. else if (typeof define === 'function' && define.amd) {
  212. // AMD. Register as an anonymous module.
  213. define([], function(){ return global.Base64 });
  214. }
  215. // that's it!
  216. return {Base64: global.Base64}
  217. }));