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