1#!/usr/bin/env python 2 3# Copyright 2014 The Chromium Authors 4# Use of this source code is governed by a BSD-style license that can be 5# found in the LICENSE file. 6 7"""This script builds a table that has to be manully inserted into 8net/spdy/hpack/hpack_constants.cc. It also contains data that potentially has to 9be updated if the http hpack algorithm changes its constants.""" 10 11import re 12 13# This is from 14# http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 15# It may include dummy rows as long as those don't look too much like real 16# data. 17SPEC_DATA_DRAFT_08 = r""" 18 code 19 code as bits as hex len 20 sym aligned to MSB aligned in 21 to LSB bits 22 ( 0) |11111111|11000 1ff8 [13] 23 ( 1) |11111111|11111111|1011000 7fffd8 [23] 24 ( 2) |11111111|11111111|11111110|0010 fffffe2 [28] 25 ( 3) |11111111|11111111|11111110|0011 fffffe3 [28] 26 ( 4) |11111111|11111111|11111110|0100 fffffe4 [28] 27 ( 5) |11111111|11111111|11111110|0101 fffffe5 [28] 28 ( 6) |11111111|11111111|11111110|0110 fffffe6 [28] 29 ( 7) |11111111|11111111|11111110|0111 fffffe7 [28] 30 ( 8) |11111111|11111111|11111110|1000 fffffe8 [28] 31 ( 9) |11111111|11111111|11101010 ffffea [24] 32 ( 10) |11111111|11111111|11111111|111100 3ffffffc [30] 33 ( 11) |11111111|11111111|11111110|1001 fffffe9 [28] 34 ( 12) |11111111|11111111|11111110|1010 fffffea [28] 35 ( 13) |11111111|11111111|11111111|111101 3ffffffd [30] 36 ( 14) |11111111|11111111|11111110|1011 fffffeb [28] 37 ( 15) |11111111|11111111|11111110|1100 fffffec [28] 38 ( 16) |11111111|11111111|11111110|1101 fffffed [28] 39 ( 17) |11111111|11111111|11111110|1110 fffffee [28] 40 ( 18) |11111111|11111111|11111110|1111 fffffef [28] 41 ( 19) |11111111|11111111|11111111|0000 ffffff0 [28] 42 ( 20) |11111111|11111111|11111111|0001 ffffff1 [28] 43 ( 21) |11111111|11111111|11111111|0010 ffffff2 [28] 44 ( 22) |11111111|11111111|11111111|111110 3ffffffe [30] 45 ( 23) |11111111|11111111|11111111|0011 ffffff3 [28] 46 ( 24) |11111111|11111111|11111111|0100 ffffff4 [28] 47 ( 25) |11111111|11111111|11111111|0101 ffffff5 [28] 48 ( 26) |11111111|11111111|11111111|0110 ffffff6 [28] 49 ( 27) |11111111|11111111|11111111|0111 ffffff7 [28] 50 ( 28) |11111111|11111111|11111111|1000 ffffff8 [28] 51 ( 29) |11111111|11111111|11111111|1001 ffffff9 [28] 52 ( 30) |11111111|11111111|11111111|1010 ffffffa [28] 53 ( 31) |11111111|11111111|11111111|1011 ffffffb [28] 54' ' ( 32) |010100 14 [ 6] 55'!' ( 33) |11111110|00 3f8 [10] 56'"' ( 34) |11111110|01 3f9 [10] 57'#' ( 35) |11111111|1010 ffa [12] 58'$' ( 36) |11111111|11001 1ff9 [13] 59'%' ( 37) |010101 15 [ 6] 60'&' ( 38) |11111000 f8 [ 8] 61''' ( 39) |11111111|010 7fa [11] 62'(' ( 40) |11111110|10 3fa [10] 63')' ( 41) |11111110|11 3fb [10] 64'*' ( 42) |11111001 f9 [ 8] 65'+' ( 43) |11111111|011 7fb [11] 66',' ( 44) |11111010 fa [ 8] 67'-' ( 45) |010110 16 [ 6] 68'.' ( 46) |010111 17 [ 6] 69'/' ( 47) |011000 18 [ 6] 70'0' ( 48) |00000 0 [ 5] 71'1' ( 49) |00001 1 [ 5] 72'2' ( 50) |00010 2 [ 5] 73'3' ( 51) |011001 19 [ 6] 74'4' ( 52) |011010 1a [ 6] 75'5' ( 53) |011011 1b [ 6] 76'6' ( 54) |011100 1c [ 6] 77'7' ( 55) |011101 1d [ 6] 78'8' ( 56) |011110 1e [ 6] 79'9' ( 57) |011111 1f [ 6] 80':' ( 58) |1011100 5c [ 7] 81';' ( 59) |11111011 fb [ 8] 82'<' ( 60) |11111111|1111100 7ffc [15] 83'=' ( 61) |100000 20 [ 6] 84'>' ( 62) |11111111|1011 ffb [12] 85'?' ( 63) |11111111|00 3fc [10] 86'@' ( 64) |11111111|11010 1ffa [13] 87'A' ( 65) |100001 21 [ 6] 88'B' ( 66) |1011101 5d [ 7] 89'C' ( 67) |1011110 5e [ 7] 90'D' ( 68) |1011111 5f [ 7] 91'E' ( 69) |1100000 60 [ 7] 92'F' ( 70) |1100001 61 [ 7] 93'G' ( 71) |1100010 62 [ 7] 94'H' ( 72) |1100011 63 [ 7] 95'I' ( 73) |1100100 64 [ 7] 96'J' ( 74) |1100101 65 [ 7] 97'K' ( 75) |1100110 66 [ 7] 98'L' ( 76) |1100111 67 [ 7] 99'M' ( 77) |1101000 68 [ 7] 100'N' ( 78) |1101001 69 [ 7] 101'O' ( 79) |1101010 6a [ 7] 102'P' ( 80) |1101011 6b [ 7] 103'Q' ( 81) |1101100 6c [ 7] 104'R' ( 82) |1101101 6d [ 7] 105'S' ( 83) |1101110 6e [ 7] 106'T' ( 84) |1101111 6f [ 7] 107'U' ( 85) |1110000 70 [ 7] 108'V' ( 86) |1110001 71 [ 7] 109'W' ( 87) |1110010 72 [ 7] 110'X' ( 88) |11111100 fc [ 8] 111'Y' ( 89) |1110011 73 [ 7] 112'Z' ( 90) |11111101 fd [ 8] 113'[' ( 91) |11111111|11011 1ffb [13] 114'\' ( 92) |11111111|11111110|000 7fff0 [19] 115']' ( 93) |11111111|11100 1ffc [13] 116'^' ( 94) |11111111|111100 3ffc [14] 117'_' ( 95) |100010 22 [ 6] 118'`' ( 96) |11111111|1111101 7ffd [15] 119'a' ( 97) |00011 3 [ 5] 120'b' ( 98) |100011 23 [ 6] 121'c' ( 99) |00100 4 [ 5] 122'd' (100) |100100 24 [ 6] 123'e' (101) |00101 5 [ 5] 124'f' (102) |100101 25 [ 6] 125'g' (103) |100110 26 [ 6] 126'h' (104) |100111 27 [ 6] 127'i' (105) |00110 6 [ 5] 128'j' (106) |1110100 74 [ 7] 129'k' (107) |1110101 75 [ 7] 130'l' (108) |101000 28 [ 6] 131'm' (109) |101001 29 [ 6] 132'n' (110) |101010 2a [ 6] 133'o' (111) |00111 7 [ 5] 134'p' (112) |101011 2b [ 6] 135'q' (113) |1110110 76 [ 7] 136'r' (114) |101100 2c [ 6] 137's' (115) |01000 8 [ 5] 138't' (116) |01001 9 [ 5] 139'u' (117) |101101 2d [ 6] 140'v' (118) |1110111 77 [ 7] 141'w' (119) |1111000 78 [ 7] 142'x' (120) |1111001 79 [ 7] 143'y' (121) |1111010 7a [ 7] 144'z' (122) |1111011 7b [ 7] 145'{' (123) |11111111|1111110 7ffe [15] 146'|' (124) |11111111|100 7fc [11] 147'}' (125) |11111111|111101 3ffd [14] 148'~' (126) |11111111|11101 1ffd [13] 149 (127) |11111111|11111111|11111111|1100 ffffffc [28] 150 (128) |11111111|11111110|0110 fffe6 [20] 151 (129) |11111111|11111111|010010 3fffd2 [22] 152 (130) |11111111|11111110|0111 fffe7 [20] 153 (131) |11111111|11111110|1000 fffe8 [20] 154 (132) |11111111|11111111|010011 3fffd3 [22] 155 (133) |11111111|11111111|010100 3fffd4 [22] 156 (134) |11111111|11111111|010101 3fffd5 [22] 157 (135) |11111111|11111111|1011001 7fffd9 [23] 158 (136) |11111111|11111111|010110 3fffd6 [22] 159 (137) |11111111|11111111|1011010 7fffda [23] 160 (138) |11111111|11111111|1011011 7fffdb [23] 161 (139) |11111111|11111111|1011100 7fffdc [23] 162 (140) |11111111|11111111|1011101 7fffdd [23] 163 (141) |11111111|11111111|1011110 7fffde [23] 164 (142) |11111111|11111111|11101011 ffffeb [24] 165 (143) |11111111|11111111|1011111 7fffdf [23] 166 (144) |11111111|11111111|11101100 ffffec [24] 167 (145) |11111111|11111111|11101101 ffffed [24] 168 (146) |11111111|11111111|010111 3fffd7 [22] 169 (147) |11111111|11111111|1100000 7fffe0 [23] 170 (148) |11111111|11111111|11101110 ffffee [24] 171 (149) |11111111|11111111|1100001 7fffe1 [23] 172 (150) |11111111|11111111|1100010 7fffe2 [23] 173 (151) |11111111|11111111|1100011 7fffe3 [23] 174 (152) |11111111|11111111|1100100 7fffe4 [23] 175 (153) |11111111|11111110|11100 1fffdc [21] 176 (154) |11111111|11111111|011000 3fffd8 [22] 177 (155) |11111111|11111111|1100101 7fffe5 [23] 178 (156) |11111111|11111111|011001 3fffd9 [22] 179 (157) |11111111|11111111|1100110 7fffe6 [23] 180 (158) |11111111|11111111|1100111 7fffe7 [23] 181 (159) |11111111|11111111|11101111 ffffef [24] 182 (160) |11111111|11111111|011010 3fffda [22] 183 (161) |11111111|11111110|11101 1fffdd [21] 184 (162) |11111111|11111110|1001 fffe9 [20] 185 (163) |11111111|11111111|011011 3fffdb [22] 186 (164) |11111111|11111111|011100 3fffdc [22] 187 (165) |11111111|11111111|1101000 7fffe8 [23] 188 (166) |11111111|11111111|1101001 7fffe9 [23] 189 (167) |11111111|11111110|11110 1fffde [21] 190 (168) |11111111|11111111|1101010 7fffea [23] 191 (169) |11111111|11111111|011101 3fffdd [22] 192 (170) |11111111|11111111|011110 3fffde [22] 193 (171) |11111111|11111111|11110000 fffff0 [24] 194 (172) |11111111|11111110|11111 1fffdf [21] 195 (173) |11111111|11111111|011111 3fffdf [22] 196 (174) |11111111|11111111|1101011 7fffeb [23] 197 (175) |11111111|11111111|1101100 7fffec [23] 198 (176) |11111111|11111111|00000 1fffe0 [21] 199 (177) |11111111|11111111|00001 1fffe1 [21] 200 (178) |11111111|11111111|100000 3fffe0 [22] 201 (179) |11111111|11111111|00010 1fffe2 [21] 202 (180) |11111111|11111111|1101101 7fffed [23] 203 (181) |11111111|11111111|100001 3fffe1 [22] 204 (182) |11111111|11111111|1101110 7fffee [23] 205 (183) |11111111|11111111|1101111 7fffef [23] 206 (184) |11111111|11111110|1010 fffea [20] 207 (185) |11111111|11111111|100010 3fffe2 [22] 208 (186) |11111111|11111111|100011 3fffe3 [22] 209 (187) |11111111|11111111|100100 3fffe4 [22] 210 (188) |11111111|11111111|1110000 7ffff0 [23] 211 (189) |11111111|11111111|100101 3fffe5 [22] 212 (190) |11111111|11111111|100110 3fffe6 [22] 213 (191) |11111111|11111111|1110001 7ffff1 [23] 214 (192) |11111111|11111111|11111000|00 3ffffe0 [26] 215 (193) |11111111|11111111|11111000|01 3ffffe1 [26] 216 (194) |11111111|11111110|1011 fffeb [20] 217 (195) |11111111|11111110|001 7fff1 [19] 218 (196) |11111111|11111111|100111 3fffe7 [22] 219 (197) |11111111|11111111|1110010 7ffff2 [23] 220 (198) |11111111|11111111|101000 3fffe8 [22] 221 (199) |11111111|11111111|11110110|0 1ffffec [25] 222 (200) |11111111|11111111|11111000|10 3ffffe2 [26] 223 (201) |11111111|11111111|11111000|11 3ffffe3 [26] 224 (202) |11111111|11111111|11111001|00 3ffffe4 [26] 225 (203) |11111111|11111111|11111011|110 7ffffde [27] 226 (204) |11111111|11111111|11111011|111 7ffffdf [27] 227 (205) |11111111|11111111|11111001|01 3ffffe5 [26] 228 (206) |11111111|11111111|11110001 fffff1 [24] 229 (207) |11111111|11111111|11110110|1 1ffffed [25] 230 (208) |11111111|11111110|010 7fff2 [19] 231 (209) |11111111|11111111|00011 1fffe3 [21] 232 (210) |11111111|11111111|11111001|10 3ffffe6 [26] 233 (211) |11111111|11111111|11111100|000 7ffffe0 [27] 234 (212) |11111111|11111111|11111100|001 7ffffe1 [27] 235 (213) |11111111|11111111|11111001|11 3ffffe7 [26] 236 (214) |11111111|11111111|11111100|010 7ffffe2 [27] 237 (215) |11111111|11111111|11110010 fffff2 [24] 238 (216) |11111111|11111111|00100 1fffe4 [21] 239 (217) |11111111|11111111|00101 1fffe5 [21] 240 (218) |11111111|11111111|11111010|00 3ffffe8 [26] 241 (219) |11111111|11111111|11111010|01 3ffffe9 [26] 242 (220) |11111111|11111111|11111111|1101 ffffffd [28] 243 (221) |11111111|11111111|11111100|011 7ffffe3 [27] 244 (222) |11111111|11111111|11111100|100 7ffffe4 [27] 245 (223) |11111111|11111111|11111100|101 7ffffe5 [27] 246 (224) |11111111|11111110|1100 fffec [20] 247 (225) |11111111|11111111|11110011 fffff3 [24] 248 (226) |11111111|11111110|1101 fffed [20] 249 (227) |11111111|11111111|00110 1fffe6 [21] 250 (228) |11111111|11111111|101001 3fffe9 [22] 251 (229) |11111111|11111111|00111 1fffe7 [21] 252 (230) |11111111|11111111|01000 1fffe8 [21] 253 (231) |11111111|11111111|1110011 7ffff3 [23] 254 (232) |11111111|11111111|101010 3fffea [22] 255 (233) |11111111|11111111|101011 3fffeb [22] 256 (234) |11111111|11111111|11110111|0 1ffffee [25] 257 (235) |11111111|11111111|11110111|1 1ffffef [25] 258 (236) |11111111|11111111|11110100 fffff4 [24] 259 (237) |11111111|11111111|11110101 fffff5 [24] 260 (238) |11111111|11111111|11111010|10 3ffffea [26] 261 (239) |11111111|11111111|1110100 7ffff4 [23] 262 (240) |11111111|11111111|11111010|11 3ffffeb [26] 263 (241) |11111111|11111111|11111100|110 7ffffe6 [27] 264 (242) |11111111|11111111|11111011|00 3ffffec [26] 265 (243) |11111111|11111111|11111011|01 3ffffed [26] 266 (244) |11111111|11111111|11111100|111 7ffffe7 [27] 267 (245) |11111111|11111111|11111101|000 7ffffe8 [27] 268 (246) |11111111|11111111|11111101|001 7ffffe9 [27] 269 (247) |11111111|11111111|11111101|010 7ffffea [27] 270 (248) |11111111|11111111|11111101|011 7ffffeb [27] 271 (249) |11111111|11111111|11111111|1110 ffffffe [28] 272 (250) |11111111|11111111|11111101|100 7ffffec [27] 273 (251) |11111111|11111111|11111101|101 7ffffed [27] 274 (252) |11111111|11111111|11111101|110 7ffffee [27] 275 (253) |11111111|11111111|11111101|111 7ffffef [27] 276 (254) |11111111|11111111|11111110|000 7fffff0 [27] 277 (255) |11111111|11111111|11111011|10 3ffffee [26] 278EOS (256) |11111111|11111111|11111111|111111 3fffffff [30] 279""" 280 281count = 0 282spec_lines = SPEC_DATA_DRAFT_08.splitlines() 283for l in spec_lines: 284 m = re.match( 285 r"^\s*('.+'|EOS)? \( *(\d+)\) \|([10\|]+) +\w+ \[ ?(\d+)\]", l) 286 if m: 287 g = m.groups() 288 spec_comment = g[0] 289 spec_bitstring = g[2] 290 bitstring = spec_bitstring.replace('|','').ljust(32,'0') 291 bitvalue = int(bitstring, 2) 292 bitcount = g[3] 293 valueid = g[1] 294 comment = ' // %s' % spec_bitstring 295 if spec_comment: 296 comment = ' // %3s %s' % (spec_comment, spec_bitstring) 297 else: 298 comment = ' // %s' % spec_bitstring 299 print(' {0x%08xul, %02s, %03s},%s' % ( 300 bitvalue, bitcount, valueid, comment)) 301 assert int(valueid) == count, "Expected data for %s, got %s." % (count, 302 valueid) 303 count += 1 304print("Total: %s" % count) 305assert count == 257, "Expected 257 values, got %d." % count 306