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http://git.haproxy.org/git/haproxy.git/
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8071eae6b9
This one was built by studying the HPACK Huffman table (RFC7541 appendix B). It creates 5 small tables (4*512 bytes, 1*64 bytes) to map one byte at a time from the input stream based on the following observations : * rht_bit31_24[256] is indexed on bits 31..24 when < 0xfe * rht_bit24_17[256] is indexed on bits 24..17 when 31..24 >= 0xfe * rht_bit15_11_fe[32] is indexed on bits 15..11 when 24..17 == 0xfe * rht_bit15_8[256] is indexed on bits 15..8 when 24..17 == 0xff * rht_bit11_4[256] is indexed on bits 11..4 when 15..8 == 0xff * when 11..4 == 0xff, 3..2 provide the following mapping : * 00 => 0x0a, 01 => 0x0d, 10 => 0x16, 11 => EOS
370 lines
13 KiB
C
370 lines
13 KiB
C
/* Reverse Huffman table generator for HPACK decoder - 2017-05-19 Willy Tarreau
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*
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* rht_bit31_24[256] is indexed on bits 31..24 when < 0xfe
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* rht_bit24_17[256] is indexed on bits 24..17 when 31..24 >= 0xfe
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* rht_bit15_11_fe[32] is indexed on bits 15..11 when 24..17 == 0xfe
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* rht_bit15_8[256] is indexed on bits 15..8 when 24..17 == 0xff
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* rht_bit11_4[256] is indexed on bits 11..4 when 15..8 == 0xff
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* when 11..4 == 0xff, 3..2 provide the following mapping :
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* 00 => 0x0a, 01 => 0x0d, 10 => 0x16, 11 => EOS
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* from RFC7541 Appendix B */
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static const struct huff {
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uint32_t c; /* code point */
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int b; /* bits */
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} ht[257] = {
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[0] = { .c = 0x00001ff8, .b = 13 },
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[1] = { .c = 0x007fffd8, .b = 23 },
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[2] = { .c = 0x0fffffe2, .b = 28 },
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[3] = { .c = 0x0fffffe3, .b = 28 },
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[4] = { .c = 0x0fffffe4, .b = 28 },
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[5] = { .c = 0x0fffffe5, .b = 28 },
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[6] = { .c = 0x0fffffe6, .b = 28 },
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[7] = { .c = 0x0fffffe7, .b = 28 },
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[8] = { .c = 0x0fffffe8, .b = 28 },
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[9] = { .c = 0x00ffffea, .b = 24 },
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[10] = { .c = 0x3ffffffc, .b = 30 },
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[11] = { .c = 0x0fffffe9, .b = 28 },
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[12] = { .c = 0x0fffffea, .b = 28 },
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[13] = { .c = 0x3ffffffd, .b = 30 },
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[14] = { .c = 0x0fffffeb, .b = 28 },
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[15] = { .c = 0x0fffffec, .b = 28 },
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[16] = { .c = 0x0fffffed, .b = 28 },
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[17] = { .c = 0x0fffffee, .b = 28 },
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[18] = { .c = 0x0fffffef, .b = 28 },
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[19] = { .c = 0x0ffffff0, .b = 28 },
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[20] = { .c = 0x0ffffff1, .b = 28 },
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[21] = { .c = 0x0ffffff2, .b = 28 },
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[22] = { .c = 0x3ffffffe, .b = 30 },
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[23] = { .c = 0x0ffffff3, .b = 28 },
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[24] = { .c = 0x0ffffff4, .b = 28 },
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[25] = { .c = 0x0ffffff5, .b = 28 },
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[26] = { .c = 0x0ffffff6, .b = 28 },
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[27] = { .c = 0x0ffffff7, .b = 28 },
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[28] = { .c = 0x0ffffff8, .b = 28 },
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[29] = { .c = 0x0ffffff9, .b = 28 },
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[30] = { .c = 0x0ffffffa, .b = 28 },
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[31] = { .c = 0x0ffffffb, .b = 28 },
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[32] = { .c = 0x00000014, .b = 6 },
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[33] = { .c = 0x000003f8, .b = 10 },
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[34] = { .c = 0x000003f9, .b = 10 },
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[35] = { .c = 0x00000ffa, .b = 12 },
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[36] = { .c = 0x00001ff9, .b = 13 },
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[37] = { .c = 0x00000015, .b = 6 },
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[38] = { .c = 0x000000f8, .b = 8 },
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[39] = { .c = 0x000007fa, .b = 11 },
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[40] = { .c = 0x000003fa, .b = 10 },
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[41] = { .c = 0x000003fb, .b = 10 },
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[42] = { .c = 0x000000f9, .b = 8 },
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[43] = { .c = 0x000007fb, .b = 11 },
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[44] = { .c = 0x000000fa, .b = 8 },
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[45] = { .c = 0x00000016, .b = 6 },
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[46] = { .c = 0x00000017, .b = 6 },
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[47] = { .c = 0x00000018, .b = 6 },
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[48] = { .c = 0x00000000, .b = 5 },
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[49] = { .c = 0x00000001, .b = 5 },
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[50] = { .c = 0x00000002, .b = 5 },
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[51] = { .c = 0x00000019, .b = 6 },
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[52] = { .c = 0x0000001a, .b = 6 },
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[53] = { .c = 0x0000001b, .b = 6 },
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[54] = { .c = 0x0000001c, .b = 6 },
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[55] = { .c = 0x0000001d, .b = 6 },
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[56] = { .c = 0x0000001e, .b = 6 },
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[57] = { .c = 0x0000001f, .b = 6 },
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[58] = { .c = 0x0000005c, .b = 7 },
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[59] = { .c = 0x000000fb, .b = 8 },
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[60] = { .c = 0x00007ffc, .b = 15 },
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[61] = { .c = 0x00000020, .b = 6 },
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[62] = { .c = 0x00000ffb, .b = 12 },
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[63] = { .c = 0x000003fc, .b = 10 },
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[64] = { .c = 0x00001ffa, .b = 13 },
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[65] = { .c = 0x00000021, .b = 6 },
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[66] = { .c = 0x0000005d, .b = 7 },
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[67] = { .c = 0x0000005e, .b = 7 },
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[68] = { .c = 0x0000005f, .b = 7 },
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[69] = { .c = 0x00000060, .b = 7 },
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[70] = { .c = 0x00000061, .b = 7 },
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[71] = { .c = 0x00000062, .b = 7 },
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[72] = { .c = 0x00000063, .b = 7 },
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[73] = { .c = 0x00000064, .b = 7 },
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[74] = { .c = 0x00000065, .b = 7 },
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[75] = { .c = 0x00000066, .b = 7 },
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[76] = { .c = 0x00000067, .b = 7 },
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[77] = { .c = 0x00000068, .b = 7 },
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[78] = { .c = 0x00000069, .b = 7 },
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[79] = { .c = 0x0000006a, .b = 7 },
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[80] = { .c = 0x0000006b, .b = 7 },
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[81] = { .c = 0x0000006c, .b = 7 },
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[82] = { .c = 0x0000006d, .b = 7 },
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[83] = { .c = 0x0000006e, .b = 7 },
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[84] = { .c = 0x0000006f, .b = 7 },
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[85] = { .c = 0x00000070, .b = 7 },
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[86] = { .c = 0x00000071, .b = 7 },
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[87] = { .c = 0x00000072, .b = 7 },
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[88] = { .c = 0x000000fc, .b = 8 },
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[89] = { .c = 0x00000073, .b = 7 },
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[90] = { .c = 0x000000fd, .b = 8 },
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[91] = { .c = 0x00001ffb, .b = 13 },
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[92] = { .c = 0x0007fff0, .b = 19 },
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[93] = { .c = 0x00001ffc, .b = 13 },
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[94] = { .c = 0x00003ffc, .b = 14 },
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[95] = { .c = 0x00000022, .b = 6 },
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[96] = { .c = 0x00007ffd, .b = 15 },
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[97] = { .c = 0x00000003, .b = 5 },
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[98] = { .c = 0x00000023, .b = 6 },
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[99] = { .c = 0x00000004, .b = 5 },
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[100] = { .c = 0x00000024, .b = 6 },
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[101] = { .c = 0x00000005, .b = 5 },
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[102] = { .c = 0x00000025, .b = 6 },
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[103] = { .c = 0x00000026, .b = 6 },
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[104] = { .c = 0x00000027, .b = 6 },
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[105] = { .c = 0x00000006, .b = 5 },
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[106] = { .c = 0x00000074, .b = 7 },
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[107] = { .c = 0x00000075, .b = 7 },
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[108] = { .c = 0x00000028, .b = 6 },
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[109] = { .c = 0x00000029, .b = 6 },
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[110] = { .c = 0x0000002a, .b = 6 },
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[111] = { .c = 0x00000007, .b = 5 },
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[112] = { .c = 0x0000002b, .b = 6 },
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[113] = { .c = 0x00000076, .b = 7 },
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[114] = { .c = 0x0000002c, .b = 6 },
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[115] = { .c = 0x00000008, .b = 5 },
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[116] = { .c = 0x00000009, .b = 5 },
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[117] = { .c = 0x0000002d, .b = 6 },
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[118] = { .c = 0x00000077, .b = 7 },
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[119] = { .c = 0x00000078, .b = 7 },
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[120] = { .c = 0x00000079, .b = 7 },
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[121] = { .c = 0x0000007a, .b = 7 },
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[122] = { .c = 0x0000007b, .b = 7 },
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[123] = { .c = 0x00007ffe, .b = 15 },
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[124] = { .c = 0x000007fc, .b = 11 },
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[125] = { .c = 0x00003ffd, .b = 14 },
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[126] = { .c = 0x00001ffd, .b = 13 },
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[127] = { .c = 0x0ffffffc, .b = 28 },
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[128] = { .c = 0x000fffe6, .b = 20 },
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[129] = { .c = 0x003fffd2, .b = 22 },
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[130] = { .c = 0x000fffe7, .b = 20 },
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[131] = { .c = 0x000fffe8, .b = 20 },
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[132] = { .c = 0x003fffd3, .b = 22 },
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[133] = { .c = 0x003fffd4, .b = 22 },
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[134] = { .c = 0x003fffd5, .b = 22 },
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[135] = { .c = 0x007fffd9, .b = 23 },
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[136] = { .c = 0x003fffd6, .b = 22 },
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[137] = { .c = 0x007fffda, .b = 23 },
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[138] = { .c = 0x007fffdb, .b = 23 },
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[139] = { .c = 0x007fffdc, .b = 23 },
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[140] = { .c = 0x007fffdd, .b = 23 },
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[141] = { .c = 0x007fffde, .b = 23 },
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[142] = { .c = 0x00ffffeb, .b = 24 },
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[143] = { .c = 0x007fffdf, .b = 23 },
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[144] = { .c = 0x00ffffec, .b = 24 },
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[145] = { .c = 0x00ffffed, .b = 24 },
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[146] = { .c = 0x003fffd7, .b = 22 },
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[147] = { .c = 0x007fffe0, .b = 23 },
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[148] = { .c = 0x00ffffee, .b = 24 },
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[149] = { .c = 0x007fffe1, .b = 23 },
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[150] = { .c = 0x007fffe2, .b = 23 },
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[151] = { .c = 0x007fffe3, .b = 23 },
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[152] = { .c = 0x007fffe4, .b = 23 },
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[153] = { .c = 0x001fffdc, .b = 21 },
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[154] = { .c = 0x003fffd8, .b = 22 },
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[155] = { .c = 0x007fffe5, .b = 23 },
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[156] = { .c = 0x003fffd9, .b = 22 },
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[157] = { .c = 0x007fffe6, .b = 23 },
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[158] = { .c = 0x007fffe7, .b = 23 },
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[159] = { .c = 0x00ffffef, .b = 24 },
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[160] = { .c = 0x003fffda, .b = 22 },
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[161] = { .c = 0x001fffdd, .b = 21 },
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[162] = { .c = 0x000fffe9, .b = 20 },
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[163] = { .c = 0x003fffdb, .b = 22 },
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[164] = { .c = 0x003fffdc, .b = 22 },
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[165] = { .c = 0x007fffe8, .b = 23 },
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[166] = { .c = 0x007fffe9, .b = 23 },
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[167] = { .c = 0x001fffde, .b = 21 },
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[168] = { .c = 0x007fffea, .b = 23 },
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[169] = { .c = 0x003fffdd, .b = 22 },
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[170] = { .c = 0x003fffde, .b = 22 },
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[171] = { .c = 0x00fffff0, .b = 24 },
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[172] = { .c = 0x001fffdf, .b = 21 },
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[173] = { .c = 0x003fffdf, .b = 22 },
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[174] = { .c = 0x007fffeb, .b = 23 },
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[175] = { .c = 0x007fffec, .b = 23 },
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[176] = { .c = 0x001fffe0, .b = 21 },
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[177] = { .c = 0x001fffe1, .b = 21 },
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[178] = { .c = 0x003fffe0, .b = 22 },
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[179] = { .c = 0x001fffe2, .b = 21 },
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[180] = { .c = 0x007fffed, .b = 23 },
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[181] = { .c = 0x003fffe1, .b = 22 },
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[182] = { .c = 0x007fffee, .b = 23 },
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[183] = { .c = 0x007fffef, .b = 23 },
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[184] = { .c = 0x000fffea, .b = 20 },
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[185] = { .c = 0x003fffe2, .b = 22 },
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[186] = { .c = 0x003fffe3, .b = 22 },
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[187] = { .c = 0x003fffe4, .b = 22 },
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[188] = { .c = 0x007ffff0, .b = 23 },
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[189] = { .c = 0x003fffe5, .b = 22 },
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[190] = { .c = 0x003fffe6, .b = 22 },
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[191] = { .c = 0x007ffff1, .b = 23 },
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[192] = { .c = 0x03ffffe0, .b = 26 },
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[193] = { .c = 0x03ffffe1, .b = 26 },
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[194] = { .c = 0x000fffeb, .b = 20 },
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[195] = { .c = 0x0007fff1, .b = 19 },
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[196] = { .c = 0x003fffe7, .b = 22 },
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[197] = { .c = 0x007ffff2, .b = 23 },
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[198] = { .c = 0x003fffe8, .b = 22 },
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[199] = { .c = 0x01ffffec, .b = 25 },
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[200] = { .c = 0x03ffffe2, .b = 26 },
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[201] = { .c = 0x03ffffe3, .b = 26 },
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[202] = { .c = 0x03ffffe4, .b = 26 },
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[203] = { .c = 0x07ffffde, .b = 27 },
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[204] = { .c = 0x07ffffdf, .b = 27 },
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[205] = { .c = 0x03ffffe5, .b = 26 },
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[206] = { .c = 0x00fffff1, .b = 24 },
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[207] = { .c = 0x01ffffed, .b = 25 },
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[208] = { .c = 0x0007fff2, .b = 19 },
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[209] = { .c = 0x001fffe3, .b = 21 },
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[210] = { .c = 0x03ffffe6, .b = 26 },
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[211] = { .c = 0x07ffffe0, .b = 27 },
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[212] = { .c = 0x07ffffe1, .b = 27 },
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[213] = { .c = 0x03ffffe7, .b = 26 },
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[214] = { .c = 0x07ffffe2, .b = 27 },
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[215] = { .c = 0x00fffff2, .b = 24 },
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[216] = { .c = 0x001fffe4, .b = 21 },
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[217] = { .c = 0x001fffe5, .b = 21 },
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[218] = { .c = 0x03ffffe8, .b = 26 },
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[219] = { .c = 0x03ffffe9, .b = 26 },
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[220] = { .c = 0x0ffffffd, .b = 28 },
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[221] = { .c = 0x07ffffe3, .b = 27 },
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[222] = { .c = 0x07ffffe4, .b = 27 },
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[223] = { .c = 0x07ffffe5, .b = 27 },
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[224] = { .c = 0x000fffec, .b = 20 },
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[225] = { .c = 0x00fffff3, .b = 24 },
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[226] = { .c = 0x000fffed, .b = 20 },
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[227] = { .c = 0x001fffe6, .b = 21 },
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[228] = { .c = 0x003fffe9, .b = 22 },
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[229] = { .c = 0x001fffe7, .b = 21 },
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[230] = { .c = 0x001fffe8, .b = 21 },
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[231] = { .c = 0x007ffff3, .b = 23 },
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[232] = { .c = 0x003fffea, .b = 22 },
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[233] = { .c = 0x003fffeb, .b = 22 },
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[234] = { .c = 0x01ffffee, .b = 25 },
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[235] = { .c = 0x01ffffef, .b = 25 },
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[236] = { .c = 0x00fffff4, .b = 24 },
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[237] = { .c = 0x00fffff5, .b = 24 },
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[238] = { .c = 0x03ffffea, .b = 26 },
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[239] = { .c = 0x007ffff4, .b = 23 },
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[240] = { .c = 0x03ffffeb, .b = 26 },
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[241] = { .c = 0x07ffffe6, .b = 27 },
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[242] = { .c = 0x03ffffec, .b = 26 },
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[243] = { .c = 0x03ffffed, .b = 26 },
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[244] = { .c = 0x07ffffe7, .b = 27 },
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[245] = { .c = 0x07ffffe8, .b = 27 },
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[246] = { .c = 0x07ffffe9, .b = 27 },
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[247] = { .c = 0x07ffffea, .b = 27 },
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[248] = { .c = 0x07ffffeb, .b = 27 },
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[249] = { .c = 0x0ffffffe, .b = 28 },
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[250] = { .c = 0x07ffffec, .b = 27 },
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[251] = { .c = 0x07ffffed, .b = 27 },
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[252] = { .c = 0x07ffffee, .b = 27 },
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[253] = { .c = 0x07ffffef, .b = 27 },
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[254] = { .c = 0x07fffff0, .b = 27 },
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[255] = { .c = 0x03ffffee, .b = 26 },
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[256] = { .c = 0x3fffffff, .b = 30 }, /* EOS */
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};
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int main(int argc, char **argv)
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{
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uint32_t c, i, j;
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/* fill first byte */
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printf("struct rht rht_bit31_24[256] = {\n");
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for (j = 0; j < 256; j++) {
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for (i = 0; i < sizeof(ht)/sizeof(ht[0]); i++) {
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if (ht[i].b > 8)
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continue;
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c = ht[i].c << (32 - ht[i].b);
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if (((c ^ (j << 24)) & -(1 << (32 - ht[i].b)) & 0xff000000) == 0) {
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printf("\t[0x%02x] = { .c = 0x%02x, .l = %d },\n", j, i, ht[i].b);
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break;
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}
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}
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}
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printf("};\n\n");
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printf("struct rht rht_bit24_17[256] = {\n");
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for (j = 0; j < 256; j++) {
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for (i = 0; i < sizeof(ht)/sizeof(ht[0]); i++) {
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if (ht[i].b <= 8 || ht[i].b > 16)
|
|
continue;
|
|
c = ht[i].c << (32 - ht[i].b);
|
|
|
|
if (((c ^ (j << 17)) & -(1 << (32 - ht[i].b)) & 0x01fe0000) == 0) {
|
|
printf("\t[0x%02x] = { .c = 0x%02x, .l = %d },\n", j, i, ht[i].b);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("struct rht rht_bit15_11_fe[32] = {\n");
|
|
for (j = 0; j < 32; j++) {
|
|
for (i = 0; i < sizeof(ht)/sizeof(ht[0]); i++) {
|
|
if (ht[i].b <= 16 || ht[i].b > 21)
|
|
continue;
|
|
c = ht[i].c << (32 - ht[i].b);
|
|
if ((c & 0x00ff0000) != 0x00fe0000)
|
|
continue;
|
|
|
|
if (((c ^ (j << 11)) & -(1 << (32 - ht[i].b)) & 0x0000f800) == 0) {
|
|
printf("\t[0x%02x] = { .c = 0x%02x, .l = %d },\n", j, i, ht[i].b);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("struct rht rht_bit15_8[256] = {\n");
|
|
for (j = 0; j < 256; j++) {
|
|
for (i = 0; i < sizeof(ht)/sizeof(ht[0]); i++) {
|
|
if (ht[i].b <= 16 || ht[i].b > 24)
|
|
continue;
|
|
c = ht[i].c << (32 - ht[i].b);
|
|
if ((c & 0x00ff0000) != 0x00ff0000)
|
|
continue;
|
|
|
|
if (((c ^ (j << 8)) & -(1 << (32 - ht[i].b)) & 0x0000ff00) == 0) {
|
|
printf("\t[0x%02x] = { .c = 0x%02x, .l = %d },\n", j, i, ht[i].b);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
printf("};\n\n");
|
|
|
|
printf("struct rht rht_bit11_4[256] = {\n");
|
|
/* fill fourth byte after 0xff 0xff 0xf6-0xff. Only 0xfffffffx are not distinguished */
|
|
for (j = 0; j < 256; j++) {
|
|
for (i = 0; i < sizeof(ht)/sizeof(ht[0]); i++) {
|
|
if (ht[i].b <= 24)
|
|
continue;
|
|
c = ht[i].c << (32 - ht[i].b);
|
|
|
|
if (((c ^ (j << 4)) & -(1 << (32 - ht[i].b)) & 0x00000ff0) == 0) {
|
|
//printf("\tj=%02x i=%02x c=%08x l=%d c/l=%08x j/l=%08x xor=%08x\n", j, i, c, ht[i].b, c & -(1 << (32 - ht[i].b)), ((j << 4) & -(1 << (32 - ht[i].b))), (c ^ (j << 4)) & -(1 << (32 - ht[i].b)));
|
|
printf("\t[0x%02x] = { .c = 0x%02x, .l = %d },\n", j, i, ht[i].b);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
printf("\t/* Note, when l==30, bits 3..2 give 00:0x0a, 01:0x0d, 10:0x16, 11:EOS */\n");
|
|
printf("};\n\n");
|
|
return 0;
|
|
}
|