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  1. ?package
  2. {
  3.  
  4. public class GACodec extends Object
  5. {
  6. private static var SHIFT:Number = 60;
  7. private static var CAPS_ON:Number = 61;
  8. private static var CAPS_OFF:Number = 62;
  9. private static var UNICODE:Number = 63;
  10. private static var PADLENGTH:Number = 64;
  11. private static var BASELENGTH:Number = 128;
  12. private static var INVALID:Number = -1;
  13. private static var bDebug:Boolean = false;
  14. private static var s_cLPad:Array = new Array(" ", "!", "\"", "#", "$", "\'", "(", ")", "*", "+", ",", "-", ".", "/", "&", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", ":", ";", "<", "=", ">", "@", "[", "]", "_", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z");
  15. private static var s_bReverseLPad:Array = new Array(BASELENGTH);
  16. private static var s_cUPad:Array = new Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
  17. private static var s_bReverseUPad:Array = new Array(BASELENGTH);
  18. private static var s_cEncodePad:Array = new Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "/");
  19. private static var s_bDecodePad:Array = new Array(BASELENGTH);
  20.  
  21. public function GACodec()
  22. {
  23. var _loc_1:* = NaN;
  24. _loc_1 = 0;
  25. while (_loc_1 < BASELENGTH)
  26. {
  27.  
  28. s_bReverseLPad[_loc_1] = INVALID;
  29. s_bReverseUPad[_loc_1] = INVALID;
  30. s_bDecodePad[_loc_1] = INVALID;
  31. _loc_1 = _loc_1 + 1;
  32. }
  33. _loc_1 = 0;
  34. while (_loc_1 < PADLENGTH)
  35. {
  36.  
  37. if (_loc_1 < s_cLPad.length)
  38. {
  39. s_bReverseLPad[s_cLPad[_loc_1].charCodeAt(0)] = _loc_1;
  40. }
  41. if (_loc_1 < s_cUPad.length)
  42. {
  43. s_bReverseUPad[s_cUPad[_loc_1].charCodeAt(0)] = _loc_1;
  44. }
  45. s_bDecodePad[s_cEncodePad[_loc_1].charCodeAt(0)] = _loc_1;
  46. _loc_1 = _loc_1 + 1;
  47. }
  48. return;
  49. }// end function
  50.  
  51. private function toCharArray(param1:String) : Array
  52. {
  53. var _loc_2:* = new Array();
  54. var _loc_3:* = 0;
  55. while (_loc_3 <= (param1.length - 1))
  56. {
  57.  
  58. _loc_2.push(param1.charCodeAt(_loc_3));
  59. _loc_3++;
  60. }
  61. return _loc_2;
  62. }// end function
  63.  
  64. public function isWhiteSpace(param1:Number) : Boolean
  65. {
  66. return param1 == 32 || param1 == 13 || param1 == 10 || param1 == 9;
  67. }// end function
  68.  
  69. private function removeWhiteSpace(param1:Array) : Number
  70. {
  71. if (param1 == null)
  72. {
  73. return 0;
  74. }
  75. var _loc_2:* = 0;
  76. var _loc_3:* = param1.length;
  77. var _loc_4:* = 0;
  78. while (_loc_4 < _loc_3)
  79. {
  80.  
  81. if (!isWhiteSpace(param1[_loc_4]))
  82. {
  83. param1[++_loc_2] = param1[_loc_4];
  84. }
  85. _loc_4++;
  86. }
  87. return _loc_2;
  88. }// end function
  89.  
  90. private function convertToBytes(param1:String) : Array
  91. {
  92. var _loc_5:* = NaN;
  93. if (param1 == null)
  94. {
  95. return null;
  96. }
  97. var _loc_2:* = toCharArray(param1);
  98. var _loc_3:* = removeWhiteSpace(_loc_2);
  99. var _loc_4:* = new Array(_loc_3);
  100. var _loc_6:* = 0;
  101. while (_loc_6 < _loc_3)
  102. {
  103.  
  104. _loc_5 = s_bDecodePad[_loc_2[_loc_6]];
  105. if (_loc_5 != INVALID)
  106. {
  107. _loc_4[_loc_6] = _loc_5;
  108. }
  109. else
  110. {
  111. throw new Error("Bad char (=" + _loc_2[_loc_6] + "\') at pos " + _loc_6);
  112. }
  113. _loc_6++;
  114. }
  115. return _loc_4;
  116. }// end function
  117.  
  118. private function convertToString(param1:Array) : String
  119. {
  120. var _loc_2:* = "";
  121. if (param1 == null)
  122. {
  123. return null;
  124. }
  125. var _loc_3:* = new Array(param1.length);
  126. var _loc_4:* = 0;
  127. while (_loc_4 < param1.length)
  128. {
  129.  
  130. if (param1[_loc_4] > PADLENGTH || param1[_loc_4] < 0)
  131. {
  132. throw new Error("Bad byte (=" + param1[_loc_4] + ") at pos " + _loc_4);
  133. }
  134. _loc_3[_loc_4] = s_cEncodePad[param1[_loc_4]];
  135. _loc_2 = _loc_2 + _loc_3[_loc_4];
  136. _loc_4++;
  137. }
  138. return _loc_2;
  139. }// end function
  140.  
  141. public function decode(param1:String) : String
  142. {
  143. var bUnicode:Array;
  144. var strInput:* = param1;
  145. if (strInput == null)
  146. {
  147. return null;
  148. }
  149. var aData:* = convertToBytes(strInput);
  150. if (bDebug)
  151. {
  152. trace("Pre encode [" + aData.toString() + "]");
  153. }
  154. var sbOut:* = new String("");
  155. var bShift:Boolean;
  156. var i:int;
  157. while (i < aData.length)
  158. {
  159.  
  160. switch(aData[i])
  161. {
  162. case CAPS_ON:
  163. {
  164. bShift;
  165. break;
  166. }
  167. case CAPS_OFF:
  168. {
  169. bShift;
  170. break;
  171. }
  172. case SHIFT:
  173. {
  174. i = (i + 1);
  175. sbOut = sbOut + s_cUPad[aData[(i + 1)]];
  176. break;
  177. }
  178. case UNICODE:
  179. {
  180. bUnicode = new Array(2);
  181. i = (i + 1);
  182. i = (i + 1);
  183. bUnicode[0] = aData[(i + 1)] << 2 | aData[(i + 1)] >> 4;
  184. i = (i + 1);
  185. bUnicode[1] = aData[i] << 4 | aData[(i + 1)] >> 2;
  186. try
  187. {
  188. sbOut = sbOut + String.fromCharCode(bUnicode[0] + bUnicode[1]);
  189. }
  190. catch (err:Error)
  191. {
  192. throw new Error("Cannot decode");
  193. }
  194. break;
  195. }
  196. default:
  197. {
  198. if (!bShift)
  199. {
  200. sbOut = sbOut + s_cLPad[aData[i]];
  201. }
  202. else
  203. {
  204. sbOut = sbOut + s_cUPad[aData[i]];
  205. }
  206. break;
  207. }
  208. }
  209. i = (i + 1);
  210. }
  211. return sbOut;
  212. }// end function
  213.  
  214. public function encode(param1:String) : String
  215. {
  216. var c:Number;
  217. var bL:Number;
  218. var bU:Number;
  219. var n1:Number;
  220. var n2:Number;
  221. var strInput:* = param1;
  222. if (strInput == null)
  223. {
  224. return null;
  225. }
  226. var aData:* = toCharArray(strInput);
  227. var bOut:* = new Array();
  228. var bShift:Boolean;
  229. var i:int;
  230. while (i < aData.length)
  231. {
  232.  
  233. c = aData[i];
  234. if (isWhiteSpace(c))
  235. {
  236. c;
  237. }
  238. bL = c > BASELENGTH ? (INVALID) : (s_bReverseLPad[c]);
  239. bU = c > BASELENGTH ? (INVALID) : (s_bReverseUPad[c]);
  240. if (bL != INVALID)
  241. {
  242. if (bShift)
  243. {
  244. bOut.push(CAPS_OFF);
  245. bShift;
  246. }
  247. bOut.push(bL);
  248. }
  249. else if (bU != INVALID)
  250. {
  251. if (!bShift)
  252. {
  253. if ((i + 1) < aData.length && s_bReverseUPad[aData[(i + 1)]] != INVALID)
  254. {
  255. bOut.push(CAPS_ON);
  256. bShift;
  257. }
  258. else
  259. {
  260. bOut.push(SHIFT);
  261. }
  262. }
  263. bOut.push(bU);
  264. }
  265. else
  266. {
  267. bOut.push(UNICODE);
  268. try
  269. {
  270. n1;
  271. n2 = c < 0 ? (c + 256) : (c);
  272. bOut.push(n1 >> 2 & 63);
  273. bOut.push((n1 << 4 | n2 >> 4) & 63);
  274. bOut.push(n2 << 2 & 63);
  275. }
  276. catch (err:Error)
  277. {
  278. throw new Error("Cannot encode");
  279. }
  280. }
  281. i = (i + 1);
  282. }
  283. if (bDebug)
  284. {
  285. trace("Pre decode [" + bOut.toString() + "]");
  286. }
  287. return convertToString(bOut);
  288. }// end function
  289.  
  290. }
  291. }
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