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4 years ago
  1. var utils = require('./utils');
  2. var table = `
  3. ( 0) |11111111|11000 1ff8 [13]
  4. ( 1) |11111111|11111111|1011000 7fffd8 [23]
  5. ( 2) |11111111|11111111|11111110|0010 fffffe2 [28]
  6. ( 3) |11111111|11111111|11111110|0011 fffffe3 [28]
  7. ( 4) |11111111|11111111|11111110|0100 fffffe4 [28]
  8. ( 5) |11111111|11111111|11111110|0101 fffffe5 [28]
  9. ( 6) |11111111|11111111|11111110|0110 fffffe6 [28]
  10. ( 7) |11111111|11111111|11111110|0111 fffffe7 [28]
  11. ( 8) |11111111|11111111|11111110|1000 fffffe8 [28]
  12. ( 9) |11111111|11111111|11101010 ffffea [24]
  13. ( 10) |11111111|11111111|11111111|111100 3ffffffc [30]
  14. ( 11) |11111111|11111111|11111110|1001 fffffe9 [28]
  15. ( 12) |11111111|11111111|11111110|1010 fffffea [28]
  16. ( 13) |11111111|11111111|11111111|111101 3ffffffd [30]
  17. ( 14) |11111111|11111111|11111110|1011 fffffeb [28]
  18. ( 15) |11111111|11111111|11111110|1100 fffffec [28]
  19. ( 16) |11111111|11111111|11111110|1101 fffffed [28]
  20. ( 17) |11111111|11111111|11111110|1110 fffffee [28]
  21. ( 18) |11111111|11111111|11111110|1111 fffffef [28]
  22. ( 19) |11111111|11111111|11111111|0000 ffffff0 [28]
  23. ( 20) |11111111|11111111|11111111|0001 ffffff1 [28]
  24. ( 21) |11111111|11111111|11111111|0010 ffffff2 [28]
  25. ( 22) |11111111|11111111|11111111|111110 3ffffffe [30]
  26. ( 23) |11111111|11111111|11111111|0011 ffffff3 [28]
  27. ( 24) |11111111|11111111|11111111|0100 ffffff4 [28]
  28. ( 25) |11111111|11111111|11111111|0101 ffffff5 [28]
  29. ( 26) |11111111|11111111|11111111|0110 ffffff6 [28]
  30. ( 27) |11111111|11111111|11111111|0111 ffffff7 [28]
  31. ( 28) |11111111|11111111|11111111|1000 ffffff8 [28]
  32. ( 29) |11111111|11111111|11111111|1001 ffffff9 [28]
  33. ( 30) |11111111|11111111|11111111|1010 ffffffa [28]
  34. ( 31) |11111111|11111111|11111111|1011 ffffffb [28]
  35. ' ' ( 32) |010100 14 [ 6]
  36. '!' ( 33) |11111110|00 3f8 [10]
  37. '"' ( 34) |11111110|01 3f9 [10]
  38. '#' ( 35) |11111111|1010 ffa [12]
  39. '$' ( 36) |11111111|11001 1ff9 [13]
  40. '%' ( 37) |010101 15 [ 6]
  41. '&' ( 38) |11111000 f8 [ 8]
  42. ''' ( 39) |11111111|010 7fa [11]
  43. '(' ( 40) |11111110|10 3fa [10]
  44. ')' ( 41) |11111110|11 3fb [10]
  45. '*' ( 42) |11111001 f9 [ 8]
  46. '+' ( 43) |11111111|011 7fb [11]
  47. ',' ( 44) |11111010 fa [ 8]
  48. '-' ( 45) |010110 16 [ 6]
  49. '.' ( 46) |010111 17 [ 6]
  50. '/' ( 47) |011000 18 [ 6]
  51. '0' ( 48) |00000 0 [ 5]
  52. '1' ( 49) |00001 1 [ 5]
  53. '2' ( 50) |00010 2 [ 5]
  54. '3' ( 51) |011001 19 [ 6]
  55. '4' ( 52) |011010 1a [ 6]
  56. '5' ( 53) |011011 1b [ 6]
  57. '6' ( 54) |011100 1c [ 6]
  58. '7' ( 55) |011101 1d [ 6]
  59. '8' ( 56) |011110 1e [ 6]
  60. '9' ( 57) |011111 1f [ 6]
  61. ':' ( 58) |1011100 5c [ 7]
  62. ';' ( 59) |11111011 fb [ 8]
  63. '<' ( 60) |11111111|1111100 7ffc [15]
  64. '=' ( 61) |100000 20 [ 6]
  65. '>' ( 62) |11111111|1011 ffb [12]
  66. '?' ( 63) |11111111|00 3fc [10]
  67. '@' ( 64) |11111111|11010 1ffa [13]
  68. 'A' ( 65) |100001 21 [ 6]
  69. 'B' ( 66) |1011101 5d [ 7]
  70. 'C' ( 67) |1011110 5e [ 7]
  71. 'D' ( 68) |1011111 5f [ 7]
  72. 'E' ( 69) |1100000 60 [ 7]
  73. 'F' ( 70) |1100001 61 [ 7]
  74. 'G' ( 71) |1100010 62 [ 7]
  75. 'H' ( 72) |1100011 63 [ 7]
  76. 'I' ( 73) |1100100 64 [ 7]
  77. 'J' ( 74) |1100101 65 [ 7]
  78. 'K' ( 75) |1100110 66 [ 7]
  79. 'L' ( 76) |1100111 67 [ 7]
  80. 'M' ( 77) |1101000 68 [ 7]
  81. 'N' ( 78) |1101001 69 [ 7]
  82. 'O' ( 79) |1101010 6a [ 7]
  83. 'P' ( 80) |1101011 6b [ 7]
  84. 'Q' ( 81) |1101100 6c [ 7]
  85. 'R' ( 82) |1101101 6d [ 7]
  86. 'S' ( 83) |1101110 6e [ 7]
  87. 'T' ( 84) |1101111 6f [ 7]
  88. 'U' ( 85) |1110000 70 [ 7]
  89. 'V' ( 86) |1110001 71 [ 7]
  90. 'W' ( 87) |1110010 72 [ 7]
  91. 'X' ( 88) |11111100 fc [ 8]
  92. 'Y' ( 89) |1110011 73 [ 7]
  93. 'Z' ( 90) |11111101 fd [ 8]
  94. '[' ( 91) |11111111|11011 1ffb [13]
  95. '\\' ( 92) |11111111|11111110|000 7fff0 [19]
  96. ']' ( 93) |11111111|11100 1ffc [13]
  97. '^' ( 94) |11111111|111100 3ffc [14]
  98. '_' ( 95) |100010 22 [ 6]
  99. '\`' ( 96) |11111111|1111101 7ffd [15]
  100. 'a' ( 97) |00011 3 [ 5]
  101. 'b' ( 98) |100011 23 [ 6]
  102. 'c' ( 99) |00100 4 [ 5]
  103. 'd' (100) |100100 24 [ 6]
  104. 'e' (101) |00101 5 [ 5]
  105. 'f' (102) |100101 25 [ 6]
  106. 'g' (103) |100110 26 [ 6]
  107. 'h' (104) |100111 27 [ 6]
  108. 'i' (105) |00110 6 [ 5]
  109. 'j' (106) |1110100 74 [ 7]
  110. 'k' (107) |1110101 75 [ 7]
  111. 'l' (108) |101000 28 [ 6]
  112. 'm' (109) |101001 29 [ 6]
  113. 'n' (110) |101010 2a [ 6]
  114. 'o' (111) |00111 7 [ 5]
  115. 'p' (112) |101011 2b [ 6]
  116. 'q' (113) |1110110 76 [ 7]
  117. 'r' (114) |101100 2c [ 6]
  118. 's' (115) |01000 8 [ 5]
  119. 't' (116) |01001 9 [ 5]
  120. 'u' (117) |101101 2d [ 6]
  121. 'v' (118) |1110111 77 [ 7]
  122. 'w' (119) |1111000 78 [ 7]
  123. 'x' (120) |1111001 79 [ 7]
  124. 'y' (121) |1111010 7a [ 7]
  125. 'z' (122) |1111011 7b [ 7]
  126. '{' (123) |11111111|1111110 7ffe [15]
  127. '|' (124) |11111111|100 7fc [11]
  128. '}' (125) |11111111|111101 3ffd [14]
  129. '~' (126) |11111111|11101 1ffd [13]
  130. (127) |11111111|11111111|11111111|1100 ffffffc [28]
  131. (128) |11111111|11111110|0110 fffe6 [20]
  132. (129) |11111111|11111111|010010 3fffd2 [22]
  133. (130) |11111111|11111110|0111 fffe7 [20]
  134. (131) |11111111|11111110|1000 fffe8 [20]
  135. (132) |11111111|11111111|010011 3fffd3 [22]
  136. (133) |11111111|11111111|010100 3fffd4 [22]
  137. (134) |11111111|11111111|010101 3fffd5 [22]
  138. (135) |11111111|11111111|1011001 7fffd9 [23]
  139. (136) |11111111|11111111|010110 3fffd6 [22]
  140. (137) |11111111|11111111|1011010 7fffda [23]
  141. (138) |11111111|11111111|1011011 7fffdb [23]
  142. (139) |11111111|11111111|1011100 7fffdc [23]
  143. (140) |11111111|11111111|1011101 7fffdd [23]
  144. (141) |11111111|11111111|1011110 7fffde [23]
  145. (142) |11111111|11111111|11101011 ffffeb [24]
  146. (143) |11111111|11111111|1011111 7fffdf [23]
  147. (144) |11111111|11111111|11101100 ffffec [24]
  148. (145) |11111111|11111111|11101101 ffffed [24]
  149. (146) |11111111|11111111|010111 3fffd7 [22]
  150. (147) |11111111|11111111|1100000 7fffe0 [23]
  151. (148) |11111111|11111111|11101110 ffffee [24]
  152. (149) |11111111|11111111|1100001 7fffe1 [23]
  153. (150) |11111111|11111111|1100010 7fffe2 [23]
  154. (151) |11111111|11111111|1100011 7fffe3 [23]
  155. (152) |11111111|11111111|1100100 7fffe4 [23]
  156. (153) |11111111|11111110|11100 1fffdc [21]
  157. (154) |11111111|11111111|011000 3fffd8 [22]
  158. (155) |11111111|11111111|1100101 7fffe5 [23]
  159. (156) |11111111|11111111|011001 3fffd9 [22]
  160. (157) |11111111|11111111|1100110 7fffe6 [23]
  161. (158) |11111111|11111111|1100111 7fffe7 [23]
  162. (159) |11111111|11111111|11101111 ffffef [24]
  163. (160) |11111111|11111111|011010 3fffda [22]
  164. (161) |11111111|11111110|11101 1fffdd [21]
  165. (162) |11111111|11111110|1001 fffe9 [20]
  166. (163) |11111111|11111111|011011 3fffdb [22]
  167. (164) |11111111|11111111|011100 3fffdc [22]
  168. (165) |11111111|11111111|1101000 7fffe8 [23]
  169. (166) |11111111|11111111|1101001 7fffe9 [23]
  170. (167) |11111111|11111110|11110 1fffde [21]
  171. (168) |11111111|11111111|1101010 7fffea [23]
  172. (169) |11111111|11111111|011101 3fffdd [22]
  173. (170) |11111111|11111111|011110 3fffde [22]
  174. (171) |11111111|11111111|11110000 fffff0 [24]
  175. (172) |11111111|11111110|11111 1fffdf [21]
  176. (173) |11111111|11111111|011111 3fffdf [22]
  177. (174) |11111111|11111111|1101011 7fffeb [23]
  178. (175) |11111111|11111111|1101100 7fffec [23]
  179. (176) |11111111|11111111|00000 1fffe0 [21]
  180. (177) |11111111|11111111|00001 1fffe1 [21]
  181. (178) |11111111|11111111|100000 3fffe0 [22]
  182. (179) |11111111|11111111|00010 1fffe2 [21]
  183. (180) |11111111|11111111|1101101 7fffed [23]
  184. (181) |11111111|11111111|100001 3fffe1 [22]
  185. (182) |11111111|11111111|1101110 7fffee [23]
  186. (183) |11111111|11111111|1101111 7fffef [23]
  187. (184) |11111111|11111110|1010 fffea [20]
  188. (185) |11111111|11111111|100010 3fffe2 [22]
  189. (186) |11111111|11111111|100011 3fffe3 [22]
  190. (187) |11111111|11111111|100100 3fffe4 [22]
  191. (188) |11111111|11111111|1110000 7ffff0 [23]
  192. (189) |11111111|11111111|100101 3fffe5 [22]
  193. (190) |11111111|11111111|100110 3fffe6 [22]
  194. (191) |11111111|11111111|1110001 7ffff1 [23]
  195. (192) |11111111|11111111|11111000|00 3ffffe0 [26]
  196. (193) |11111111|11111111|11111000|01 3ffffe1 [26]
  197. (194) |11111111|11111110|1011 fffeb [20]
  198. (195) |11111111|11111110|001 7fff1 [19]
  199. (196) |11111111|11111111|100111 3fffe7 [22]
  200. (197) |11111111|11111111|1110010 7ffff2 [23]
  201. (198) |11111111|11111111|101000 3fffe8 [22]
  202. (199) |11111111|11111111|11110110|0 1ffffec [25]
  203. (200) |11111111|11111111|11111000|10 3ffffe2 [26]
  204. (201) |11111111|11111111|11111000|11 3ffffe3 [26]
  205. (202) |11111111|11111111|11111001|00 3ffffe4 [26]
  206. (203) |11111111|11111111|11111011|110 7ffffde [27]
  207. (204) |11111111|11111111|11111011|111 7ffffdf [27]
  208. (205) |11111111|11111111|11111001|01 3ffffe5 [26]
  209. (206) |11111111|11111111|11110001 fffff1 [24]
  210. (207) |11111111|11111111|11110110|1 1ffffed [25]
  211. (208) |11111111|11111110|010 7fff2 [19]
  212. (209) |11111111|11111111|00011 1fffe3 [21]
  213. (210) |11111111|11111111|11111001|10 3ffffe6 [26]
  214. (211) |11111111|11111111|11111100|000 7ffffe0 [27]
  215. (212) |11111111|11111111|11111100|001 7ffffe1 [27]
  216. (213) |11111111|11111111|11111001|11 3ffffe7 [26]
  217. (214) |11111111|11111111|11111100|010 7ffffe2 [27]
  218. (215) |11111111|11111111|11110010 fffff2 [24]
  219. (216) |11111111|11111111|00100 1fffe4 [21]
  220. (217) |11111111|11111111|00101 1fffe5 [21]
  221. (218) |11111111|11111111|11111010|00 3ffffe8 [26]
  222. (219) |11111111|11111111|11111010|01 3ffffe9 [26]
  223. (220) |11111111|11111111|11111111|1101 ffffffd [28]
  224. (221) |11111111|11111111|11111100|011 7ffffe3 [27]
  225. (222) |11111111|11111111|11111100|100 7ffffe4 [27]
  226. (223) |11111111|11111111|11111100|101 7ffffe5 [27]
  227. (224) |11111111|11111110|1100 fffec [20]
  228. (225) |11111111|11111111|11110011 fffff3 [24]
  229. (226) |11111111|11111110|1101 fffed [20]
  230. (227) |11111111|11111111|00110 1fffe6 [21]
  231. (228) |11111111|11111111|101001 3fffe9 [22]
  232. (229) |11111111|11111111|00111 1fffe7 [21]
  233. (230) |11111111|11111111|01000 1fffe8 [21]
  234. (231) |11111111|11111111|1110011 7ffff3 [23]
  235. (232) |11111111|11111111|101010 3fffea [22]
  236. (233) |11111111|11111111|101011 3fffeb [22]
  237. (234) |11111111|11111111|11110111|0 1ffffee [25]
  238. (235) |11111111|11111111|11110111|1 1ffffef [25]
  239. (236) |11111111|11111111|11110100 fffff4 [24]
  240. (237) |11111111|11111111|11110101 fffff5 [24]
  241. (238) |11111111|11111111|11111010|10 3ffffea [26]
  242. (239) |11111111|11111111|1110100 7ffff4 [23]
  243. (240) |11111111|11111111|11111010|11 3ffffeb [26]
  244. (241) |11111111|11111111|11111100|110 7ffffe6 [27]
  245. (242) |11111111|11111111|11111011|00 3ffffec [26]
  246. (243) |11111111|11111111|11111011|01 3ffffed [26]
  247. (244) |11111111|11111111|11111100|111 7ffffe7 [27]
  248. (245) |11111111|11111111|11111101|000 7ffffe8 [27]
  249. (246) |11111111|11111111|11111101|001 7ffffe9 [27]
  250. (247) |11111111|11111111|11111101|010 7ffffea [27]
  251. (248) |11111111|11111111|11111101|011 7ffffeb [27]
  252. (249) |11111111|11111111|11111111|1110 ffffffe [28]
  253. (250) |11111111|11111111|11111101|100 7ffffec [27]
  254. (251) |11111111|11111111|11111101|101 7ffffed [27]
  255. (252) |11111111|11111111|11111101|110 7ffffee [27]
  256. (253) |11111111|11111111|11111101|111 7ffffef [27]
  257. (254) |11111111|11111111|11111110|000 7fffff0 [27]
  258. (255) |11111111|11111111|11111011|10 3ffffee [26]
  259. EOS (256) |11111111|11111111|11111111|111111 3fffffff [30]
  260. `;
  261. table = table.split('\n').filter(function(line) {
  262. return line.length > 0;
  263. });
  264. function createNode() {
  265. // See `encodeBits`
  266. var arr = new Array(256);
  267. for (var i = 0; i < arr.length; i++)
  268. arr[i] = 0;
  269. return arr;
  270. }
  271. var decode = createNode();
  272. var encode = createNode();
  273. function encodeBits(bits) {
  274. var num = parseInt(bits, 2);
  275. return num;
  276. }
  277. table.forEach(function(line) {
  278. var match = line.match(/\(\s*([\d]+)\)\s+\|([^\s]+)\s+([^\s]+)/);
  279. var octet = match[1] | 0;
  280. var bits = match[2].split(/\|/g);
  281. var hex = parseInt(match[3], 16);
  282. var node = decode;
  283. var totalLen = 0;
  284. for (var i = 0; i < bits.length - 1; i++) {
  285. var b = encodeBits(bits[i]);
  286. totalLen += bits[i].length;
  287. if (node[b] === 0)
  288. node[b] = createNode();
  289. node = node[b];
  290. }
  291. totalLen += bits[i].length;
  292. node[encodeBits(bits[i])] = (bits[i].length << 9) | octet;
  293. encode[octet] = [ totalLen, hex ];
  294. });
  295. // Wrap lines after 79 chars
  296. out = 'exports.decode =\n' + utils.wrap(JSON.stringify(decode)) + ';';
  297. console.log(out);
  298. out = 'exports.encode =\n' + utils.wrap(JSON.stringify(encode)) + ';';
  299. console.log(out);