1#!/usr/bin/env python 2 3# Copyright 2014 The Chromium Authors. All rights reserved. 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_constants.cc. It also contains data that potentially 9has to be updated if the http hpack algorithm changes its 10constants.""" 11 12import re 13 14# This is from 15# http://tools.ietf.org/html/draft-ietf-httpbis-header-compression-08 16# It may include dummy rows as long as those don't look too much like real 17# data. 18SPEC_DATA_DRAFT_08 = r""" 19 code 20 code as bits as hex len 21 sym aligned to MSB aligned in 22 to LSB bits 23 ( 0) |11111111|11000 1ff8 [13] 24 ( 1) |11111111|11111111|1011000 7fffd8 [23] 25 ( 2) |11111111|11111111|11111110|0010 fffffe2 [28] 26 ( 3) |11111111|11111111|11111110|0011 fffffe3 [28] 27 ( 4) |11111111|11111111|11111110|0100 fffffe4 [28] 28 ( 5) |11111111|11111111|11111110|0101 fffffe5 [28] 29 ( 6) |11111111|11111111|11111110|0110 fffffe6 [28] 30 ( 7) |11111111|11111111|11111110|0111 fffffe7 [28] 31 ( 8) |11111111|11111111|11111110|1000 fffffe8 [28] 32 ( 9) |11111111|11111111|11101010 ffffea [24] 33 ( 10) |11111111|11111111|11111111|111100 3ffffffc [30] 34 ( 11) |11111111|11111111|11111110|1001 fffffe9 [28] 35 ( 12) |11111111|11111111|11111110|1010 fffffea [28] 36 ( 13) |11111111|11111111|11111111|111101 3ffffffd [30] 37 ( 14) |11111111|11111111|11111110|1011 fffffeb [28] 38 ( 15) |11111111|11111111|11111110|1100 fffffec [28] 39 ( 16) |11111111|11111111|11111110|1101 fffffed [28] 40 ( 17) |11111111|11111111|11111110|1110 fffffee [28] 41 ( 18) |11111111|11111111|11111110|1111 fffffef [28] 42 ( 19) |11111111|11111111|11111111|0000 ffffff0 [28] 43 ( 20) |11111111|11111111|11111111|0001 ffffff1 [28] 44 ( 21) |11111111|11111111|11111111|0010 ffffff2 [28] 45 ( 22) |11111111|11111111|11111111|111110 3ffffffe [30] 46 ( 23) |11111111|11111111|11111111|0011 ffffff3 [28] 47 ( 24) |11111111|11111111|11111111|0100 ffffff4 [28] 48 ( 25) |11111111|11111111|11111111|0101 ffffff5 [28] 49 ( 26) |11111111|11111111|11111111|0110 ffffff6 [28] 50 ( 27) |11111111|11111111|11111111|0111 ffffff7 [28] 51 ( 28) |11111111|11111111|11111111|1000 ffffff8 [28] 52 ( 29) |11111111|11111111|11111111|1001 ffffff9 [28] 53 ( 30) |11111111|11111111|11111111|1010 ffffffa [28] 54 ( 31) |11111111|11111111|11111111|1011 ffffffb [28] 55' ' ( 32) |010100 14 [ 6] 56'!' ( 33) |11111110|00 3f8 [10] 57'"' ( 34) |11111110|01 3f9 [10] 58'#' ( 35) |11111111|1010 ffa [12] 59'$' ( 36) |11111111|11001 1ff9 [13] 60'%' ( 37) |010101 15 [ 6] 61'&' ( 38) |11111000 f8 [ 8] 62''' ( 39) |11111111|010 7fa [11] 63'(' ( 40) |11111110|10 3fa [10] 64')' ( 41) |11111110|11 3fb [10] 65'*' ( 42) |11111001 f9 [ 8] 66'+' ( 43) |11111111|011 7fb [11] 67',' ( 44) |11111010 fa [ 8] 68'-' ( 45) |010110 16 [ 6] 69'.' ( 46) |010111 17 [ 6] 70'/' ( 47) |011000 18 [ 6] 71'0' ( 48) |00000 0 [ 5] 72'1' ( 49) |00001 1 [ 5] 73'2' ( 50) |00010 2 [ 5] 74'3' ( 51) |011001 19 [ 6] 75'4' ( 52) |011010 1a [ 6] 76'5' ( 53) |011011 1b [ 6] 77'6' ( 54) |011100 1c [ 6] 78'7' ( 55) |011101 1d [ 6] 79'8' ( 56) |011110 1e [ 6] 80'9' ( 57) |011111 1f [ 6] 81':' ( 58) |1011100 5c [ 7] 82';' ( 59) |11111011 fb [ 8] 83'<' ( 60) |11111111|1111100 7ffc [15] 84'=' ( 61) |100000 20 [ 6] 85'>' ( 62) |11111111|1011 ffb [12] 86'?' ( 63) |11111111|00 3fc [10] 87'@' ( 64) |11111111|11010 1ffa [13] 88'A' ( 65) |100001 21 [ 6] 89'B' ( 66) |1011101 5d [ 7] 90'C' ( 67) |1011110 5e [ 7] 91'D' ( 68) |1011111 5f [ 7] 92'E' ( 69) |1100000 60 [ 7] 93'F' ( 70) |1100001 61 [ 7] 94'G' ( 71) |1100010 62 [ 7] 95'H' ( 72) |1100011 63 [ 7] 96'I' ( 73) |1100100 64 [ 7] 97'J' ( 74) |1100101 65 [ 7] 98'K' ( 75) |1100110 66 [ 7] 99'L' ( 76) |1100111 67 [ 7] 100'M' ( 77) |1101000 68 [ 7] 101'N' ( 78) |1101001 69 [ 7] 102'O' ( 79) |1101010 6a [ 7] 103'P' ( 80) |1101011 6b [ 7] 104'Q' ( 81) |1101100 6c [ 7] 105'R' ( 82) |1101101 6d [ 7] 106'S' ( 83) |1101110 6e [ 7] 107'T' ( 84) |1101111 6f [ 7] 108'U' ( 85) |1110000 70 [ 7] 109'V' ( 86) |1110001 71 [ 7] 110'W' ( 87) |1110010 72 [ 7] 111'X' ( 88) |11111100 fc [ 8] 112'Y' ( 89) |1110011 73 [ 7] 113'Z' ( 90) |11111101 fd [ 8] 114'[' ( 91) |11111111|11011 1ffb [13] 115'\' ( 92) |11111111|11111110|000 7fff0 [19] 116']' ( 93) |11111111|11100 1ffc [13] 117'^' ( 94) |11111111|111100 3ffc [14] 118'_' ( 95) |100010 22 [ 6] 119'`' ( 96) |11111111|1111101 7ffd [15] 120'a' ( 97) |00011 3 [ 5] 121'b' ( 98) |100011 23 [ 6] 122'c' ( 99) |00100 4 [ 5] 123'd' (100) |100100 24 [ 6] 124'e' (101) |00101 5 [ 5] 125'f' (102) |100101 25 [ 6] 126'g' (103) |100110 26 [ 6] 127'h' (104) |100111 27 [ 6] 128'i' (105) |00110 6 [ 5] 129'j' (106) |1110100 74 [ 7] 130'k' (107) |1110101 75 [ 7] 131'l' (108) |101000 28 [ 6] 132'm' (109) |101001 29 [ 6] 133'n' (110) |101010 2a [ 6] 134'o' (111) |00111 7 [ 5] 135'p' (112) |101011 2b [ 6] 136'q' (113) |1110110 76 [ 7] 137'r' (114) |101100 2c [ 6] 138's' (115) |01000 8 [ 5] 139't' (116) |01001 9 [ 5] 140'u' (117) |101101 2d [ 6] 141'v' (118) |1110111 77 [ 7] 142'w' (119) |1111000 78 [ 7] 143'x' (120) |1111001 79 [ 7] 144'y' (121) |1111010 7a [ 7] 145'z' (122) |1111011 7b [ 7] 146'{' (123) |11111111|1111110 7ffe [15] 147'|' (124) |11111111|100 7fc [11] 148'}' (125) |11111111|111101 3ffd [14] 149'~' (126) |11111111|11101 1ffd [13] 150 (127) |11111111|11111111|11111111|1100 ffffffc [28] 151 (128) |11111111|11111110|0110 fffe6 [20] 152 (129) |11111111|11111111|010010 3fffd2 [22] 153 (130) |11111111|11111110|0111 fffe7 [20] 154 (131) |11111111|11111110|1000 fffe8 [20] 155 (132) |11111111|11111111|010011 3fffd3 [22] 156 (133) |11111111|11111111|010100 3fffd4 [22] 157 (134) |11111111|11111111|010101 3fffd5 [22] 158 (135) |11111111|11111111|1011001 7fffd9 [23] 159 (136) |11111111|11111111|010110 3fffd6 [22] 160 (137) |11111111|11111111|1011010 7fffda [23] 161 (138) |11111111|11111111|1011011 7fffdb [23] 162 (139) |11111111|11111111|1011100 7fffdc [23] 163 (140) |11111111|11111111|1011101 7fffdd [23] 164 (141) |11111111|11111111|1011110 7fffde [23] 165 (142) |11111111|11111111|11101011 ffffeb [24] 166 (143) |11111111|11111111|1011111 7fffdf [23] 167 (144) |11111111|11111111|11101100 ffffec [24] 168 (145) |11111111|11111111|11101101 ffffed [24] 169 (146) |11111111|11111111|010111 3fffd7 [22] 170 (147) |11111111|11111111|1100000 7fffe0 [23] 171 (148) |11111111|11111111|11101110 ffffee [24] 172 (149) |11111111|11111111|1100001 7fffe1 [23] 173 (150) |11111111|11111111|1100010 7fffe2 [23] 174 (151) |11111111|11111111|1100011 7fffe3 [23] 175 (152) |11111111|11111111|1100100 7fffe4 [23] 176 (153) |11111111|11111110|11100 1fffdc [21] 177 (154) |11111111|11111111|011000 3fffd8 [22] 178 (155) |11111111|11111111|1100101 7fffe5 [23] 179 (156) |11111111|11111111|011001 3fffd9 [22] 180 (157) |11111111|11111111|1100110 7fffe6 [23] 181 (158) |11111111|11111111|1100111 7fffe7 [23] 182 (159) |11111111|11111111|11101111 ffffef [24] 183 (160) |11111111|11111111|011010 3fffda [22] 184 (161) |11111111|11111110|11101 1fffdd [21] 185 (162) |11111111|11111110|1001 fffe9 [20] 186 (163) |11111111|11111111|011011 3fffdb [22] 187 (164) |11111111|11111111|011100 3fffdc [22] 188 (165) |11111111|11111111|1101000 7fffe8 [23] 189 (166) |11111111|11111111|1101001 7fffe9 [23] 190 (167) |11111111|11111110|11110 1fffde [21] 191 (168) |11111111|11111111|1101010 7fffea [23] 192 (169) |11111111|11111111|011101 3fffdd [22] 193 (170) |11111111|11111111|011110 3fffde [22] 194 (171) |11111111|11111111|11110000 fffff0 [24] 195 (172) |11111111|11111110|11111 1fffdf [21] 196 (173) |11111111|11111111|011111 3fffdf [22] 197 (174) |11111111|11111111|1101011 7fffeb [23] 198 (175) |11111111|11111111|1101100 7fffec [23] 199 (176) |11111111|11111111|00000 1fffe0 [21] 200 (177) |11111111|11111111|00001 1fffe1 [21] 201 (178) |11111111|11111111|100000 3fffe0 [22] 202 (179) |11111111|11111111|00010 1fffe2 [21] 203 (180) |11111111|11111111|1101101 7fffed [23] 204 (181) |11111111|11111111|100001 3fffe1 [22] 205 (182) |11111111|11111111|1101110 7fffee [23] 206 (183) |11111111|11111111|1101111 7fffef [23] 207 (184) |11111111|11111110|1010 fffea [20] 208 (185) |11111111|11111111|100010 3fffe2 [22] 209 (186) |11111111|11111111|100011 3fffe3 [22] 210 (187) |11111111|11111111|100100 3fffe4 [22] 211 (188) |11111111|11111111|1110000 7ffff0 [23] 212 (189) |11111111|11111111|100101 3fffe5 [22] 213 (190) |11111111|11111111|100110 3fffe6 [22] 214 (191) |11111111|11111111|1110001 7ffff1 [23] 215 (192) |11111111|11111111|11111000|00 3ffffe0 [26] 216 (193) |11111111|11111111|11111000|01 3ffffe1 [26] 217 (194) |11111111|11111110|1011 fffeb [20] 218 (195) |11111111|11111110|001 7fff1 [19] 219 (196) |11111111|11111111|100111 3fffe7 [22] 220 (197) |11111111|11111111|1110010 7ffff2 [23] 221 (198) |11111111|11111111|101000 3fffe8 [22] 222 (199) |11111111|11111111|11110110|0 1ffffec [25] 223 (200) |11111111|11111111|11111000|10 3ffffe2 [26] 224 (201) |11111111|11111111|11111000|11 3ffffe3 [26] 225 (202) |11111111|11111111|11111001|00 3ffffe4 [26] 226 (203) |11111111|11111111|11111011|110 7ffffde [27] 227 (204) |11111111|11111111|11111011|111 7ffffdf [27] 228 (205) |11111111|11111111|11111001|01 3ffffe5 [26] 229 (206) |11111111|11111111|11110001 fffff1 [24] 230 (207) |11111111|11111111|11110110|1 1ffffed [25] 231 (208) |11111111|11111110|010 7fff2 [19] 232 (209) |11111111|11111111|00011 1fffe3 [21] 233 (210) |11111111|11111111|11111001|10 3ffffe6 [26] 234 (211) |11111111|11111111|11111100|000 7ffffe0 [27] 235 (212) |11111111|11111111|11111100|001 7ffffe1 [27] 236 (213) |11111111|11111111|11111001|11 3ffffe7 [26] 237 (214) |11111111|11111111|11111100|010 7ffffe2 [27] 238 (215) |11111111|11111111|11110010 fffff2 [24] 239 (216) |11111111|11111111|00100 1fffe4 [21] 240 (217) |11111111|11111111|00101 1fffe5 [21] 241 (218) |11111111|11111111|11111010|00 3ffffe8 [26] 242 (219) |11111111|11111111|11111010|01 3ffffe9 [26] 243 (220) |11111111|11111111|11111111|1101 ffffffd [28] 244 (221) |11111111|11111111|11111100|011 7ffffe3 [27] 245 (222) |11111111|11111111|11111100|100 7ffffe4 [27] 246 (223) |11111111|11111111|11111100|101 7ffffe5 [27] 247 (224) |11111111|11111110|1100 fffec [20] 248 (225) |11111111|11111111|11110011 fffff3 [24] 249 (226) |11111111|11111110|1101 fffed [20] 250 (227) |11111111|11111111|00110 1fffe6 [21] 251 (228) |11111111|11111111|101001 3fffe9 [22] 252 (229) |11111111|11111111|00111 1fffe7 [21] 253 (230) |11111111|11111111|01000 1fffe8 [21] 254 (231) |11111111|11111111|1110011 7ffff3 [23] 255 (232) |11111111|11111111|101010 3fffea [22] 256 (233) |11111111|11111111|101011 3fffeb [22] 257 (234) |11111111|11111111|11110111|0 1ffffee [25] 258 (235) |11111111|11111111|11110111|1 1ffffef [25] 259 (236) |11111111|11111111|11110100 fffff4 [24] 260 (237) |11111111|11111111|11110101 fffff5 [24] 261 (238) |11111111|11111111|11111010|10 3ffffea [26] 262 (239) |11111111|11111111|1110100 7ffff4 [23] 263 (240) |11111111|11111111|11111010|11 3ffffeb [26] 264 (241) |11111111|11111111|11111100|110 7ffffe6 [27] 265 (242) |11111111|11111111|11111011|00 3ffffec [26] 266 (243) |11111111|11111111|11111011|01 3ffffed [26] 267 (244) |11111111|11111111|11111100|111 7ffffe7 [27] 268 (245) |11111111|11111111|11111101|000 7ffffe8 [27] 269 (246) |11111111|11111111|11111101|001 7ffffe9 [27] 270 (247) |11111111|11111111|11111101|010 7ffffea [27] 271 (248) |11111111|11111111|11111101|011 7ffffeb [27] 272 (249) |11111111|11111111|11111111|1110 ffffffe [28] 273 (250) |11111111|11111111|11111101|100 7ffffec [27] 274 (251) |11111111|11111111|11111101|101 7ffffed [27] 275 (252) |11111111|11111111|11111101|110 7ffffee [27] 276 (253) |11111111|11111111|11111101|111 7ffffef [27] 277 (254) |11111111|11111111|11111110|000 7fffff0 [27] 278 (255) |11111111|11111111|11111011|10 3ffffee [26] 279EOS (256) |11111111|11111111|11111111|111111 3fffffff [30] 280""" 281 282count = 0 283spec_lines = SPEC_DATA_DRAFT_08.splitlines() 284for l in spec_lines: 285 m = re.match( 286 r"^\s*('.+'|EOS)? \( *(\d+)\) \|([10\|]+) +\w+ \[ ?(\d+)\]", l) 287 if m: 288 g = m.groups() 289 spec_comment = g[0] 290 spec_bitstring = g[2] 291 bitstring = spec_bitstring.replace('|','').ljust(32,'0') 292 bitvalue = int(bitstring, 2) 293 bitcount = g[3] 294 valueid = g[1] 295 comment = ' // %s' % spec_bitstring 296 if spec_comment: 297 comment = ' // %3s %s' % (spec_comment, spec_bitstring) 298 else: 299 comment = ' // %s' % spec_bitstring 300 print(' {0x%08xul, %02s, %03s},%s' % ( 301 bitvalue, bitcount, valueid, comment)) 302 assert int(valueid) == count, "Expected data for %s, got %s." % (count, 303 valueid) 304 count += 1 305print("Total: %s" % count) 306assert count == 257, "Expected 257 values, got %d." % count 307