MINOR: hpack: implement the HPACK Huffman table decoder
The code was borrowed from the HPACK experimental implementations
available here :
https://github.com/wtarreau/http2-exp
It contains the Huffman table as specified in RFC7541 Appendix B, and a
set of reverse tables used to decode a Huffman byte stream, and produced
by contrib/h2/gen-rht. The encoder is not finalized, it doesn't emit the
byte stream but this is not needed for now.
diff --git a/src/hpack-huff.c b/src/hpack-huff.c
new file mode 100644
index 0000000..23aa541
--- /dev/null
+++ b/src/hpack-huff.c
@@ -0,0 +1,1530 @@
+/*
+ * Huffman decoding and encoding for HPACK (RFC7541)
+ *
+ * Copyright (C) 2014-2017 Willy Tarreau <willy@haproxy.org>
+ * Copyright (C) 2017 HAProxy Technologies
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <common/config.h>
+#include <common/hpack-huff.h>
+
+struct huff {
+ uint32_t c; /* code point */
+ int b; /* bits */
+};
+
+struct rht {
+ uint8_t c; // code or 0 if length > 8 + position*8
+ uint8_t l; // length in bits
+};
+
+/* huffman table as per RFC7541 appendix B */
+static const struct huff ht[257] = {
+ [ 0] = { .c = 0x00001ff8, .b = 13 },
+ [ 1] = { .c = 0x007fffd8, .b = 23 },
+ [ 2] = { .c = 0x0fffffe2, .b = 28 },
+ [ 3] = { .c = 0x0fffffe3, .b = 28 },
+ [ 4] = { .c = 0x0fffffe4, .b = 28 },
+ [ 5] = { .c = 0x0fffffe5, .b = 28 },
+ [ 6] = { .c = 0x0fffffe6, .b = 28 },
+ [ 7] = { .c = 0x0fffffe7, .b = 28 },
+ [ 8] = { .c = 0x0fffffe8, .b = 28 },
+ [ 9] = { .c = 0x00ffffea, .b = 24 },
+ [ 10] = { .c = 0x3ffffffc, .b = 30 },
+ [ 11] = { .c = 0x0fffffe9, .b = 28 },
+ [ 12] = { .c = 0x0fffffea, .b = 28 },
+ [ 13] = { .c = 0x3ffffffd, .b = 30 },
+ [ 14] = { .c = 0x0fffffeb, .b = 28 },
+ [ 15] = { .c = 0x0fffffec, .b = 28 },
+ [ 16] = { .c = 0x0fffffed, .b = 28 },
+ [ 17] = { .c = 0x0fffffee, .b = 28 },
+ [ 18] = { .c = 0x0fffffef, .b = 28 },
+ [ 19] = { .c = 0x0ffffff0, .b = 28 },
+ [ 20] = { .c = 0x0ffffff1, .b = 28 },
+ [ 21] = { .c = 0x0ffffff2, .b = 28 },
+ [ 22] = { .c = 0x3ffffffe, .b = 30 },
+ [ 23] = { .c = 0x0ffffff3, .b = 28 },
+ [ 24] = { .c = 0x0ffffff4, .b = 28 },
+ [ 25] = { .c = 0x0ffffff5, .b = 28 },
+ [ 26] = { .c = 0x0ffffff6, .b = 28 },
+ [ 27] = { .c = 0x0ffffff7, .b = 28 },
+ [ 28] = { .c = 0x0ffffff8, .b = 28 },
+ [ 29] = { .c = 0x0ffffff9, .b = 28 },
+ [ 30] = { .c = 0x0ffffffa, .b = 28 },
+ [ 31] = { .c = 0x0ffffffb, .b = 28 },
+ [ 32] = { .c = 0x00000014, .b = 6 },
+ [ 33] = { .c = 0x000003f8, .b = 10 },
+ [ 34] = { .c = 0x000003f9, .b = 10 },
+ [ 35] = { .c = 0x00000ffa, .b = 12 },
+ [ 36] = { .c = 0x00001ff9, .b = 13 },
+ [ 37] = { .c = 0x00000015, .b = 6 },
+ [ 38] = { .c = 0x000000f8, .b = 8 },
+ [ 39] = { .c = 0x000007fa, .b = 11 },
+ [ 40] = { .c = 0x000003fa, .b = 10 },
+ [ 41] = { .c = 0x000003fb, .b = 10 },
+ [ 42] = { .c = 0x000000f9, .b = 8 },
+ [ 43] = { .c = 0x000007fb, .b = 11 },
+ [ 44] = { .c = 0x000000fa, .b = 8 },
+ [ 45] = { .c = 0x00000016, .b = 6 },
+ [ 46] = { .c = 0x00000017, .b = 6 },
+ [ 47] = { .c = 0x00000018, .b = 6 },
+ [ 48] = { .c = 0x00000000, .b = 5 },
+ [ 49] = { .c = 0x00000001, .b = 5 },
+ [ 50] = { .c = 0x00000002, .b = 5 },
+ [ 51] = { .c = 0x00000019, .b = 6 },
+ [ 52] = { .c = 0x0000001a, .b = 6 },
+ [ 53] = { .c = 0x0000001b, .b = 6 },
+ [ 54] = { .c = 0x0000001c, .b = 6 },
+ [ 55] = { .c = 0x0000001d, .b = 6 },
+ [ 56] = { .c = 0x0000001e, .b = 6 },
+ [ 57] = { .c = 0x0000001f, .b = 6 },
+ [ 58] = { .c = 0x0000005c, .b = 7 },
+ [ 59] = { .c = 0x000000fb, .b = 8 },
+ [ 60] = { .c = 0x00007ffc, .b = 15 },
+ [ 61] = { .c = 0x00000020, .b = 6 },
+ [ 62] = { .c = 0x00000ffb, .b = 12 },
+ [ 63] = { .c = 0x000003fc, .b = 10 },
+ [ 64] = { .c = 0x00001ffa, .b = 13 },
+ [ 65] = { .c = 0x00000021, .b = 6 },
+ [ 66] = { .c = 0x0000005d, .b = 7 },
+ [ 67] = { .c = 0x0000005e, .b = 7 },
+ [ 68] = { .c = 0x0000005f, .b = 7 },
+ [ 69] = { .c = 0x00000060, .b = 7 },
+ [ 70] = { .c = 0x00000061, .b = 7 },
+ [ 71] = { .c = 0x00000062, .b = 7 },
+ [ 72] = { .c = 0x00000063, .b = 7 },
+ [ 73] = { .c = 0x00000064, .b = 7 },
+ [ 74] = { .c = 0x00000065, .b = 7 },
+ [ 75] = { .c = 0x00000066, .b = 7 },
+ [ 76] = { .c = 0x00000067, .b = 7 },
+ [ 77] = { .c = 0x00000068, .b = 7 },
+ [ 78] = { .c = 0x00000069, .b = 7 },
+ [ 79] = { .c = 0x0000006a, .b = 7 },
+ [ 80] = { .c = 0x0000006b, .b = 7 },
+ [ 81] = { .c = 0x0000006c, .b = 7 },
+ [ 82] = { .c = 0x0000006d, .b = 7 },
+ [ 83] = { .c = 0x0000006e, .b = 7 },
+ [ 84] = { .c = 0x0000006f, .b = 7 },
+ [ 85] = { .c = 0x00000070, .b = 7 },
+ [ 86] = { .c = 0x00000071, .b = 7 },
+ [ 87] = { .c = 0x00000072, .b = 7 },
+ [ 88] = { .c = 0x000000fc, .b = 8 },
+ [ 89] = { .c = 0x00000073, .b = 7 },
+ [ 90] = { .c = 0x000000fd, .b = 8 },
+ [ 91] = { .c = 0x00001ffb, .b = 13 },
+ [ 92] = { .c = 0x0007fff0, .b = 19 },
+ [ 93] = { .c = 0x00001ffc, .b = 13 },
+ [ 94] = { .c = 0x00003ffc, .b = 14 },
+ [ 95] = { .c = 0x00000022, .b = 6 },
+ [ 96] = { .c = 0x00007ffd, .b = 15 },
+ [ 97] = { .c = 0x00000003, .b = 5 },
+ [ 98] = { .c = 0x00000023, .b = 6 },
+ [ 99] = { .c = 0x00000004, .b = 5 },
+ [100] = { .c = 0x00000024, .b = 6 },
+ [101] = { .c = 0x00000005, .b = 5 },
+ [102] = { .c = 0x00000025, .b = 6 },
+ [103] = { .c = 0x00000026, .b = 6 },
+ [104] = { .c = 0x00000027, .b = 6 },
+ [105] = { .c = 0x00000006, .b = 5 },
+ [106] = { .c = 0x00000074, .b = 7 },
+ [107] = { .c = 0x00000075, .b = 7 },
+ [108] = { .c = 0x00000028, .b = 6 },
+ [109] = { .c = 0x00000029, .b = 6 },
+ [110] = { .c = 0x0000002a, .b = 6 },
+ [111] = { .c = 0x00000007, .b = 5 },
+ [112] = { .c = 0x0000002b, .b = 6 },
+ [113] = { .c = 0x00000076, .b = 7 },
+ [114] = { .c = 0x0000002c, .b = 6 },
+ [115] = { .c = 0x00000008, .b = 5 },
+ [116] = { .c = 0x00000009, .b = 5 },
+ [117] = { .c = 0x0000002d, .b = 6 },
+ [118] = { .c = 0x00000077, .b = 7 },
+ [119] = { .c = 0x00000078, .b = 7 },
+ [120] = { .c = 0x00000079, .b = 7 },
+ [121] = { .c = 0x0000007a, .b = 7 },
+ [122] = { .c = 0x0000007b, .b = 7 },
+ [123] = { .c = 0x00007ffe, .b = 15 },
+ [124] = { .c = 0x000007fc, .b = 11 },
+ [125] = { .c = 0x00003ffd, .b = 14 },
+ [126] = { .c = 0x00001ffd, .b = 13 },
+ [127] = { .c = 0x0ffffffc, .b = 28 },
+ [128] = { .c = 0x000fffe6, .b = 20 },
+ [129] = { .c = 0x003fffd2, .b = 22 },
+ [130] = { .c = 0x000fffe7, .b = 20 },
+ [131] = { .c = 0x000fffe8, .b = 20 },
+ [132] = { .c = 0x003fffd3, .b = 22 },
+ [133] = { .c = 0x003fffd4, .b = 22 },
+ [134] = { .c = 0x003fffd5, .b = 22 },
+ [135] = { .c = 0x007fffd9, .b = 23 },
+ [136] = { .c = 0x003fffd6, .b = 22 },
+ [137] = { .c = 0x007fffda, .b = 23 },
+ [138] = { .c = 0x007fffdb, .b = 23 },
+ [139] = { .c = 0x007fffdc, .b = 23 },
+ [140] = { .c = 0x007fffdd, .b = 23 },
+ [141] = { .c = 0x007fffde, .b = 23 },
+ [142] = { .c = 0x00ffffeb, .b = 24 },
+ [143] = { .c = 0x007fffdf, .b = 23 },
+ [144] = { .c = 0x00ffffec, .b = 24 },
+ [145] = { .c = 0x00ffffed, .b = 24 },
+ [146] = { .c = 0x003fffd7, .b = 22 },
+ [147] = { .c = 0x007fffe0, .b = 23 },
+ [148] = { .c = 0x00ffffee, .b = 24 },
+ [149] = { .c = 0x007fffe1, .b = 23 },
+ [150] = { .c = 0x007fffe2, .b = 23 },
+ [151] = { .c = 0x007fffe3, .b = 23 },
+ [152] = { .c = 0x007fffe4, .b = 23 },
+ [153] = { .c = 0x001fffdc, .b = 21 },
+ [154] = { .c = 0x003fffd8, .b = 22 },
+ [155] = { .c = 0x007fffe5, .b = 23 },
+ [156] = { .c = 0x003fffd9, .b = 22 },
+ [157] = { .c = 0x007fffe6, .b = 23 },
+ [158] = { .c = 0x007fffe7, .b = 23 },
+ [159] = { .c = 0x00ffffef, .b = 24 },
+ [160] = { .c = 0x003fffda, .b = 22 },
+ [161] = { .c = 0x001fffdd, .b = 21 },
+ [162] = { .c = 0x000fffe9, .b = 20 },
+ [163] = { .c = 0x003fffdb, .b = 22 },
+ [164] = { .c = 0x003fffdc, .b = 22 },
+ [165] = { .c = 0x007fffe8, .b = 23 },
+ [166] = { .c = 0x007fffe9, .b = 23 },
+ [167] = { .c = 0x001fffde, .b = 21 },
+ [168] = { .c = 0x007fffea, .b = 23 },
+ [169] = { .c = 0x003fffdd, .b = 22 },
+ [170] = { .c = 0x003fffde, .b = 22 },
+ [171] = { .c = 0x00fffff0, .b = 24 },
+ [172] = { .c = 0x001fffdf, .b = 21 },
+ [173] = { .c = 0x003fffdf, .b = 22 },
+ [174] = { .c = 0x007fffeb, .b = 23 },
+ [175] = { .c = 0x007fffec, .b = 23 },
+ [176] = { .c = 0x001fffe0, .b = 21 },
+ [177] = { .c = 0x001fffe1, .b = 21 },
+ [178] = { .c = 0x003fffe0, .b = 22 },
+ [179] = { .c = 0x001fffe2, .b = 21 },
+ [180] = { .c = 0x007fffed, .b = 23 },
+ [181] = { .c = 0x003fffe1, .b = 22 },
+ [182] = { .c = 0x007fffee, .b = 23 },
+ [183] = { .c = 0x007fffef, .b = 23 },
+ [184] = { .c = 0x000fffea, .b = 20 },
+ [185] = { .c = 0x003fffe2, .b = 22 },
+ [186] = { .c = 0x003fffe3, .b = 22 },
+ [187] = { .c = 0x003fffe4, .b = 22 },
+ [188] = { .c = 0x007ffff0, .b = 23 },
+ [189] = { .c = 0x003fffe5, .b = 22 },
+ [190] = { .c = 0x003fffe6, .b = 22 },
+ [191] = { .c = 0x007ffff1, .b = 23 },
+ [192] = { .c = 0x03ffffe0, .b = 26 },
+ [193] = { .c = 0x03ffffe1, .b = 26 },
+ [194] = { .c = 0x000fffeb, .b = 20 },
+ [195] = { .c = 0x0007fff1, .b = 19 },
+ [196] = { .c = 0x003fffe7, .b = 22 },
+ [197] = { .c = 0x007ffff2, .b = 23 },
+ [198] = { .c = 0x003fffe8, .b = 22 },
+ [199] = { .c = 0x01ffffec, .b = 25 },
+ [200] = { .c = 0x03ffffe2, .b = 26 },
+ [201] = { .c = 0x03ffffe3, .b = 26 },
+ [202] = { .c = 0x03ffffe4, .b = 26 },
+ [203] = { .c = 0x07ffffde, .b = 27 },
+ [204] = { .c = 0x07ffffdf, .b = 27 },
+ [205] = { .c = 0x03ffffe5, .b = 26 },
+ [206] = { .c = 0x00fffff1, .b = 24 },
+ [207] = { .c = 0x01ffffed, .b = 25 },
+ [208] = { .c = 0x0007fff2, .b = 19 },
+ [209] = { .c = 0x001fffe3, .b = 21 },
+ [210] = { .c = 0x03ffffe6, .b = 26 },
+ [211] = { .c = 0x07ffffe0, .b = 27 },
+ [212] = { .c = 0x07ffffe1, .b = 27 },
+ [213] = { .c = 0x03ffffe7, .b = 26 },
+ [214] = { .c = 0x07ffffe2, .b = 27 },
+ [215] = { .c = 0x00fffff2, .b = 24 },
+ [216] = { .c = 0x001fffe4, .b = 21 },
+ [217] = { .c = 0x001fffe5, .b = 21 },
+ [218] = { .c = 0x03ffffe8, .b = 26 },
+ [219] = { .c = 0x03ffffe9, .b = 26 },
+ [220] = { .c = 0x0ffffffd, .b = 28 },
+ [221] = { .c = 0x07ffffe3, .b = 27 },
+ [222] = { .c = 0x07ffffe4, .b = 27 },
+ [223] = { .c = 0x07ffffe5, .b = 27 },
+ [224] = { .c = 0x000fffec, .b = 20 },
+ [225] = { .c = 0x00fffff3, .b = 24 },
+ [226] = { .c = 0x000fffed, .b = 20 },
+ [227] = { .c = 0x001fffe6, .b = 21 },
+ [228] = { .c = 0x003fffe9, .b = 22 },
+ [229] = { .c = 0x001fffe7, .b = 21 },
+ [230] = { .c = 0x001fffe8, .b = 21 },
+ [231] = { .c = 0x007ffff3, .b = 23 },
+ [232] = { .c = 0x003fffea, .b = 22 },
+ [233] = { .c = 0x003fffeb, .b = 22 },
+ [234] = { .c = 0x01ffffee, .b = 25 },
+ [235] = { .c = 0x01ffffef, .b = 25 },
+ [236] = { .c = 0x00fffff4, .b = 24 },
+ [237] = { .c = 0x00fffff5, .b = 24 },
+ [238] = { .c = 0x03ffffea, .b = 26 },
+ [239] = { .c = 0x007ffff4, .b = 23 },
+ [240] = { .c = 0x03ffffeb, .b = 26 },
+ [241] = { .c = 0x07ffffe6, .b = 27 },
+ [242] = { .c = 0x03ffffec, .b = 26 },
+ [243] = { .c = 0x03ffffed, .b = 26 },
+ [244] = { .c = 0x07ffffe7, .b = 27 },
+ [245] = { .c = 0x07ffffe8, .b = 27 },
+ [246] = { .c = 0x07ffffe9, .b = 27 },
+ [247] = { .c = 0x07ffffea, .b = 27 },
+ [248] = { .c = 0x07ffffeb, .b = 27 },
+ [249] = { .c = 0x0ffffffe, .b = 28 },
+ [250] = { .c = 0x07ffffec, .b = 27 },
+ [251] = { .c = 0x07ffffed, .b = 27 },
+ [252] = { .c = 0x07ffffee, .b = 27 },
+ [253] = { .c = 0x07ffffef, .b = 27 },
+ [254] = { .c = 0x07fffff0, .b = 27 },
+ [255] = { .c = 0x03ffffee, .b = 26 },
+ [256] = { .c = 0x3fffffff, .b = 30 }, /* EOS */
+};
+
+
+/* Reversed huffman codes, generated by contrib/h2/gen-rht.c from the table
+ * above.
+ *
+ * The codes are aligned on the MSB since that's how they appear in the stream.
+ *
+ * Quick summary below of the way the tables work. They're based on how the
+ * prefixes are organized, starting from the MSB.
+ *
+ * These codes fit in a single octet (5 to 8 bits) :
+ * 00/5 08/5 10/5 18/5 20/5 28/5 30/5 38/5
+ * 40/5 48/5
+ *
+ * 50/6 54/6 58/6 5c/6 60/6 64/6 68/6 6c/6
+ * 70/6 74/6 78/6 7c/6 80/6 84/6 88/6 8c/6
+ * 90/6 94/6 98/6 9c/6 a0/6 a4/6 a8/6 ac/6
+ * b0/6 b4/6
+ *
+ * b8/7 ba/7 bc/7 be/7 c0/7 c2/7 c4/7 c6/7
+ * c8/7 ca/7 cc/7 ce/7 d0/7 d2/7 d4/7 d6/7
+ * d8/7 da/7 dc/7 de/7 e0/7 e2/7 e4/7 e6/7
+ * e8/7 ea/7 ec/7 ee/7 f0/7 f2/7 f4/7 f6/7
+ *
+ * f8/8 f9/8 fa/8 fb/8 fc/8 fd/8
+ *
+ * ==> a single 256-symbol table based on the full byte provides a direct
+ * access and the bit count
+ *
+ * These codes fit in two octets (10 to 15 bits, neither 9 nor 16 bits code) :
+ *
+ * fe + 2 bits:
+ * 00/2 40/2 80/2 c0/2
+ *
+ * ff + 2..7 bits :
+ * 00/2
+ * 40/3 60/3 80/3
+ * a0/4 b0/4
+ * c0/5 c8/5 d0/5 d8/5 e0/5 e8/5
+ * f0/6 f4/6
+ * f8/7 fa/7 fc/7
+ *
+ * ==> a single 256-symbol table made of b0.0 and b1.7-1 provides a direct
+ * access and the bit count after a miss on the first one above.
+ *
+ * These ones fit in three octets :
+ * ff fe + 3..5 bits :
+ * 00/3 20/3 40/3 60/4 70/4 80/4 90/4 a0/4
+ * b0/4 c0/4 d0/4
+ * e0/5 e8/5 f0/5 f8/5
+ *
+ * ff ff + 5..8 bits :
+ * 00/5 08/5 10/5 18/5 20/5 28/5 30/5 38/5
+ * 40/5
+ * 48/6 4c/6 50/6 54/6 58/6 5c/6 60/6 64/6
+ * 68/6 6c/6 70/6 74/6 78/6 7c/6 80/6 84/6
+ * 88/6 8c/6 90/6 94/6 98/6 9c/6 a0/6 a4/6
+ * a8/6 ac/6
+ * b0/7 b2/7 b4/7 b6/7 b8/7 ba/7 bc/7 be/7
+ * c0/7 c2/7 c4/7 c6/7 c8/7 ca/7 cc/7 ce/7
+ * d0/7 d2/7 d4/7 d6/7 d8/7 da/7 dc/7 de/7
+ * e0/7 e2/7 e4/7 e6/7 e8/7
+ * ea/8 eb/8 ec/8 ed/8 ee/8 ef/8 f0/8 f1/8
+ * f2/8 f3/8 f4/8 f5/8
+ *
+ * ==> a 32-symbol table has to be applied to 0xfffe
+ * ==> a 256-symbol table has to be applied to 0xffff
+ *
+ * The other ones fit in four octets with 1 to 6 bits in the last one :
+ * ff ff f6 : 00/1 80/1
+ * ff ff f7 : 00/1 80/1
+ * ff ff f8 : 00/2 40/2 80/2 c0/2
+ * ff ff f9 : 00/2 40/2 80/2 c0/2
+ * ff ff fa : 00/2 40/2 80/2 c0/2
+ * ff ff fb : 00/2 40/2 80/2
+ * ff ff fb : c0/3 e0/3
+ * ff ff fc : 00/3 20/3 40/3 60/3 80/3 a0/3 c0/3 e0/3
+ * ff ff fd : 00/3 20/3 40/3 60/3 80/3 a0/3 c0/3 e0/3
+ * ff ff fe : 00/3
+ * ff ff fe : 20/4 30/4 40/4 50/4 60/4 70/4 80/4 90/4 a0/4 b0/4 c0/4 d0/4 e0/4 f0/4
+ * ff ff ff : 00/4 10/4 20/4 30/4 40/4 50/4 60/4 70/4 80/4 90/4 a0/4 b0/4 c0/4 d0/4 e0/4
+ * ff ff ff : f0/6 f4/6 f8/6 fc/6
+ *
+ * ==> a 256-symbol table with b2.0-3,b3.7-4 gives all of them except the
+ * distinction between ffffff{f0,f4,f8,fc} which is rare enough
+ * and can be done by hand when bit count == 30.
+ *
+ *
+ * Code lengths :
+ * 5..8 : 0x00..0xfe
+ * 10..15 : 0xfe
+ * 0xff 0x00..0xfe
+ * 19..20 : 0xff 0xfe 0x00..0xdf
+ * 21 : 0xff 0xfe 0xe0..0xff
+ * 21 : 0xff 0xff 0x00..0x40
+ * 22..24 : 0xff 0xff 0x00..0xf5
+ * 24..28 : 0xff 0xff 0xf5..0xff
+ * 30 : 0xff 0xff 0xff 0xf0..0xff
+ *
+ *
+ * if b0 < 0xfe ==> 5..8 bits (74 codes)
+ * if b0 == 0xfe or 0xff : 10..15
+ * => if b0 == 0xfe || b1 < 0xfe : lookup (b0:0|b1:7..1) (21 codes)
+ *
+ * -- b0 = 0xff --
+ * if b1 == 0xfe : 19..21 bits
+ * => lookup b2:7..3 (15 codes)
+ *
+ * -- b0 = 0xff, b1 = 0xff : 147 codes --
+ * if b2 < 0xf6 : 21..24 bits (76 codes)
+ * if b2 >= 0xf6 : 25..30 bits (71 codes)
+ *
+ * Algorithm:
+ * - if > 24 and < 32, read missing bits.
+ * - if less than 24 bits, read 1 byte. If past end, insert 0xff instead.
+ * - if b0 < 0xfe lookup b0 in table0[0..255]
+ * - else if b0 == 0xfe, manual lookup
+ * - else if b0 == 0xff, lookup b1 in table1[0..255]
+ * ...
+ */
+
+struct rht rht_bit31_24[256] = {
+ [0x00] = { .c = 0x30, .l = 5 },
+ [0x01] = { .c = 0x30, .l = 5 },
+ [0x02] = { .c = 0x30, .l = 5 },
+ [0x03] = { .c = 0x30, .l = 5 },
+ [0x04] = { .c = 0x30, .l = 5 },
+ [0x05] = { .c = 0x30, .l = 5 },
+ [0x06] = { .c = 0x30, .l = 5 },
+ [0x07] = { .c = 0x30, .l = 5 },
+ [0x08] = { .c = 0x31, .l = 5 },
+ [0x09] = { .c = 0x31, .l = 5 },
+ [0x0a] = { .c = 0x31, .l = 5 },
+ [0x0b] = { .c = 0x31, .l = 5 },
+ [0x0c] = { .c = 0x31, .l = 5 },
+ [0x0d] = { .c = 0x31, .l = 5 },
+ [0x0e] = { .c = 0x31, .l = 5 },
+ [0x0f] = { .c = 0x31, .l = 5 },
+ [0x10] = { .c = 0x32, .l = 5 },
+ [0x11] = { .c = 0x32, .l = 5 },
+ [0x12] = { .c = 0x32, .l = 5 },
+ [0x13] = { .c = 0x32, .l = 5 },
+ [0x14] = { .c = 0x32, .l = 5 },
+ [0x15] = { .c = 0x32, .l = 5 },
+ [0x16] = { .c = 0x32, .l = 5 },
+ [0x17] = { .c = 0x32, .l = 5 },
+ [0x18] = { .c = 0x61, .l = 5 },
+ [0x19] = { .c = 0x61, .l = 5 },
+ [0x1a] = { .c = 0x61, .l = 5 },
+ [0x1b] = { .c = 0x61, .l = 5 },
+ [0x1c] = { .c = 0x61, .l = 5 },
+ [0x1d] = { .c = 0x61, .l = 5 },
+ [0x1e] = { .c = 0x61, .l = 5 },
+ [0x1f] = { .c = 0x61, .l = 5 },
+ [0x20] = { .c = 0x63, .l = 5 },
+ [0x21] = { .c = 0x63, .l = 5 },
+ [0x22] = { .c = 0x63, .l = 5 },
+ [0x23] = { .c = 0x63, .l = 5 },
+ [0x24] = { .c = 0x63, .l = 5 },
+ [0x25] = { .c = 0x63, .l = 5 },
+ [0x26] = { .c = 0x63, .l = 5 },
+ [0x27] = { .c = 0x63, .l = 5 },
+ [0x28] = { .c = 0x65, .l = 5 },
+ [0x29] = { .c = 0x65, .l = 5 },
+ [0x2a] = { .c = 0x65, .l = 5 },
+ [0x2b] = { .c = 0x65, .l = 5 },
+ [0x2c] = { .c = 0x65, .l = 5 },
+ [0x2d] = { .c = 0x65, .l = 5 },
+ [0x2e] = { .c = 0x65, .l = 5 },
+ [0x2f] = { .c = 0x65, .l = 5 },
+ [0x30] = { .c = 0x69, .l = 5 },
+ [0x31] = { .c = 0x69, .l = 5 },
+ [0x32] = { .c = 0x69, .l = 5 },
+ [0x33] = { .c = 0x69, .l = 5 },
+ [0x34] = { .c = 0x69, .l = 5 },
+ [0x35] = { .c = 0x69, .l = 5 },
+ [0x36] = { .c = 0x69, .l = 5 },
+ [0x37] = { .c = 0x69, .l = 5 },
+ [0x38] = { .c = 0x6f, .l = 5 },
+ [0x39] = { .c = 0x6f, .l = 5 },
+ [0x3a] = { .c = 0x6f, .l = 5 },
+ [0x3b] = { .c = 0x6f, .l = 5 },
+ [0x3c] = { .c = 0x6f, .l = 5 },
+ [0x3d] = { .c = 0x6f, .l = 5 },
+ [0x3e] = { .c = 0x6f, .l = 5 },
+ [0x3f] = { .c = 0x6f, .l = 5 },
+ [0x40] = { .c = 0x73, .l = 5 },
+ [0x41] = { .c = 0x73, .l = 5 },
+ [0x42] = { .c = 0x73, .l = 5 },
+ [0x43] = { .c = 0x73, .l = 5 },
+ [0x44] = { .c = 0x73, .l = 5 },
+ [0x45] = { .c = 0x73, .l = 5 },
+ [0x46] = { .c = 0x73, .l = 5 },
+ [0x47] = { .c = 0x73, .l = 5 },
+ [0x48] = { .c = 0x74, .l = 5 },
+ [0x49] = { .c = 0x74, .l = 5 },
+ [0x4a] = { .c = 0x74, .l = 5 },
+ [0x4b] = { .c = 0x74, .l = 5 },
+ [0x4c] = { .c = 0x74, .l = 5 },
+ [0x4d] = { .c = 0x74, .l = 5 },
+ [0x4e] = { .c = 0x74, .l = 5 },
+ [0x4f] = { .c = 0x74, .l = 5 },
+ [0x50] = { .c = 0x20, .l = 6 },
+ [0x51] = { .c = 0x20, .l = 6 },
+ [0x52] = { .c = 0x20, .l = 6 },
+ [0x53] = { .c = 0x20, .l = 6 },
+ [0x54] = { .c = 0x25, .l = 6 },
+ [0x55] = { .c = 0x25, .l = 6 },
+ [0x56] = { .c = 0x25, .l = 6 },
+ [0x57] = { .c = 0x25, .l = 6 },
+ [0x58] = { .c = 0x2d, .l = 6 },
+ [0x59] = { .c = 0x2d, .l = 6 },
+ [0x5a] = { .c = 0x2d, .l = 6 },
+ [0x5b] = { .c = 0x2d, .l = 6 },
+ [0x5c] = { .c = 0x2e, .l = 6 },
+ [0x5d] = { .c = 0x2e, .l = 6 },
+ [0x5e] = { .c = 0x2e, .l = 6 },
+ [0x5f] = { .c = 0x2e, .l = 6 },
+ [0x60] = { .c = 0x2f, .l = 6 },
+ [0x61] = { .c = 0x2f, .l = 6 },
+ [0x62] = { .c = 0x2f, .l = 6 },
+ [0x63] = { .c = 0x2f, .l = 6 },
+ [0x64] = { .c = 0x33, .l = 6 },
+ [0x65] = { .c = 0x33, .l = 6 },
+ [0x66] = { .c = 0x33, .l = 6 },
+ [0x67] = { .c = 0x33, .l = 6 },
+ [0x68] = { .c = 0x34, .l = 6 },
+ [0x69] = { .c = 0x34, .l = 6 },
+ [0x6a] = { .c = 0x34, .l = 6 },
+ [0x6b] = { .c = 0x34, .l = 6 },
+ [0x6c] = { .c = 0x35, .l = 6 },
+ [0x6d] = { .c = 0x35, .l = 6 },
+ [0x6e] = { .c = 0x35, .l = 6 },
+ [0x6f] = { .c = 0x35, .l = 6 },
+ [0x70] = { .c = 0x36, .l = 6 },
+ [0x71] = { .c = 0x36, .l = 6 },
+ [0x72] = { .c = 0x36, .l = 6 },
+ [0x73] = { .c = 0x36, .l = 6 },
+ [0x74] = { .c = 0x37, .l = 6 },
+ [0x75] = { .c = 0x37, .l = 6 },
+ [0x76] = { .c = 0x37, .l = 6 },
+ [0x77] = { .c = 0x37, .l = 6 },
+ [0x78] = { .c = 0x38, .l = 6 },
+ [0x79] = { .c = 0x38, .l = 6 },
+ [0x7a] = { .c = 0x38, .l = 6 },
+ [0x7b] = { .c = 0x38, .l = 6 },
+ [0x7c] = { .c = 0x39, .l = 6 },
+ [0x7d] = { .c = 0x39, .l = 6 },
+ [0x7e] = { .c = 0x39, .l = 6 },
+ [0x7f] = { .c = 0x39, .l = 6 },
+ [0x80] = { .c = 0x3d, .l = 6 },
+ [0x81] = { .c = 0x3d, .l = 6 },
+ [0x82] = { .c = 0x3d, .l = 6 },
+ [0x83] = { .c = 0x3d, .l = 6 },
+ [0x84] = { .c = 0x41, .l = 6 },
+ [0x85] = { .c = 0x41, .l = 6 },
+ [0x86] = { .c = 0x41, .l = 6 },
+ [0x87] = { .c = 0x41, .l = 6 },
+ [0x88] = { .c = 0x5f, .l = 6 },
+ [0x89] = { .c = 0x5f, .l = 6 },
+ [0x8a] = { .c = 0x5f, .l = 6 },
+ [0x8b] = { .c = 0x5f, .l = 6 },
+ [0x8c] = { .c = 0x62, .l = 6 },
+ [0x8d] = { .c = 0x62, .l = 6 },
+ [0x8e] = { .c = 0x62, .l = 6 },
+ [0x8f] = { .c = 0x62, .l = 6 },
+ [0x90] = { .c = 0x64, .l = 6 },
+ [0x91] = { .c = 0x64, .l = 6 },
+ [0x92] = { .c = 0x64, .l = 6 },
+ [0x93] = { .c = 0x64, .l = 6 },
+ [0x94] = { .c = 0x66, .l = 6 },
+ [0x95] = { .c = 0x66, .l = 6 },
+ [0x96] = { .c = 0x66, .l = 6 },
+ [0x97] = { .c = 0x66, .l = 6 },
+ [0x98] = { .c = 0x67, .l = 6 },
+ [0x99] = { .c = 0x67, .l = 6 },
+ [0x9a] = { .c = 0x67, .l = 6 },
+ [0x9b] = { .c = 0x67, .l = 6 },
+ [0x9c] = { .c = 0x68, .l = 6 },
+ [0x9d] = { .c = 0x68, .l = 6 },
+ [0x9e] = { .c = 0x68, .l = 6 },
+ [0x9f] = { .c = 0x68, .l = 6 },
+ [0xa0] = { .c = 0x6c, .l = 6 },
+ [0xa1] = { .c = 0x6c, .l = 6 },
+ [0xa2] = { .c = 0x6c, .l = 6 },
+ [0xa3] = { .c = 0x6c, .l = 6 },
+ [0xa4] = { .c = 0x6d, .l = 6 },
+ [0xa5] = { .c = 0x6d, .l = 6 },
+ [0xa6] = { .c = 0x6d, .l = 6 },
+ [0xa7] = { .c = 0x6d, .l = 6 },
+ [0xa8] = { .c = 0x6e, .l = 6 },
+ [0xa9] = { .c = 0x6e, .l = 6 },
+ [0xaa] = { .c = 0x6e, .l = 6 },
+ [0xab] = { .c = 0x6e, .l = 6 },
+ [0xac] = { .c = 0x70, .l = 6 },
+ [0xad] = { .c = 0x70, .l = 6 },
+ [0xae] = { .c = 0x70, .l = 6 },
+ [0xaf] = { .c = 0x70, .l = 6 },
+ [0xb0] = { .c = 0x72, .l = 6 },
+ [0xb1] = { .c = 0x72, .l = 6 },
+ [0xb2] = { .c = 0x72, .l = 6 },
+ [0xb3] = { .c = 0x72, .l = 6 },
+ [0xb4] = { .c = 0x75, .l = 6 },
+ [0xb5] = { .c = 0x75, .l = 6 },
+ [0xb6] = { .c = 0x75, .l = 6 },
+ [0xb7] = { .c = 0x75, .l = 6 },
+ [0xb8] = { .c = 0x3a, .l = 7 },
+ [0xb9] = { .c = 0x3a, .l = 7 },
+ [0xba] = { .c = 0x42, .l = 7 },
+ [0xbb] = { .c = 0x42, .l = 7 },
+ [0xbc] = { .c = 0x43, .l = 7 },
+ [0xbd] = { .c = 0x43, .l = 7 },
+ [0xbe] = { .c = 0x44, .l = 7 },
+ [0xbf] = { .c = 0x44, .l = 7 },
+ [0xc0] = { .c = 0x45, .l = 7 },
+ [0xc1] = { .c = 0x45, .l = 7 },
+ [0xc2] = { .c = 0x46, .l = 7 },
+ [0xc3] = { .c = 0x46, .l = 7 },
+ [0xc4] = { .c = 0x47, .l = 7 },
+ [0xc5] = { .c = 0x47, .l = 7 },
+ [0xc6] = { .c = 0x48, .l = 7 },
+ [0xc7] = { .c = 0x48, .l = 7 },
+ [0xc8] = { .c = 0x49, .l = 7 },
+ [0xc9] = { .c = 0x49, .l = 7 },
+ [0xca] = { .c = 0x4a, .l = 7 },
+ [0xcb] = { .c = 0x4a, .l = 7 },
+ [0xcc] = { .c = 0x4b, .l = 7 },
+ [0xcd] = { .c = 0x4b, .l = 7 },
+ [0xce] = { .c = 0x4c, .l = 7 },
+ [0xcf] = { .c = 0x4c, .l = 7 },
+ [0xd0] = { .c = 0x4d, .l = 7 },
+ [0xd1] = { .c = 0x4d, .l = 7 },
+ [0xd2] = { .c = 0x4e, .l = 7 },
+ [0xd3] = { .c = 0x4e, .l = 7 },
+ [0xd4] = { .c = 0x4f, .l = 7 },
+ [0xd5] = { .c = 0x4f, .l = 7 },
+ [0xd6] = { .c = 0x50, .l = 7 },
+ [0xd7] = { .c = 0x50, .l = 7 },
+ [0xd8] = { .c = 0x51, .l = 7 },
+ [0xd9] = { .c = 0x51, .l = 7 },
+ [0xda] = { .c = 0x52, .l = 7 },
+ [0xdb] = { .c = 0x52, .l = 7 },
+ [0xdc] = { .c = 0x53, .l = 7 },
+ [0xdd] = { .c = 0x53, .l = 7 },
+ [0xde] = { .c = 0x54, .l = 7 },
+ [0xdf] = { .c = 0x54, .l = 7 },
+ [0xe0] = { .c = 0x55, .l = 7 },
+ [0xe1] = { .c = 0x55, .l = 7 },
+ [0xe2] = { .c = 0x56, .l = 7 },
+ [0xe3] = { .c = 0x56, .l = 7 },
+ [0xe4] = { .c = 0x57, .l = 7 },
+ [0xe5] = { .c = 0x57, .l = 7 },
+ [0xe6] = { .c = 0x59, .l = 7 },
+ [0xe7] = { .c = 0x59, .l = 7 },
+ [0xe8] = { .c = 0x6a, .l = 7 },
+ [0xe9] = { .c = 0x6a, .l = 7 },
+ [0xea] = { .c = 0x6b, .l = 7 },
+ [0xeb] = { .c = 0x6b, .l = 7 },
+ [0xec] = { .c = 0x71, .l = 7 },
+ [0xed] = { .c = 0x71, .l = 7 },
+ [0xee] = { .c = 0x76, .l = 7 },
+ [0xef] = { .c = 0x76, .l = 7 },
+ [0xf0] = { .c = 0x77, .l = 7 },
+ [0xf1] = { .c = 0x77, .l = 7 },
+ [0xf2] = { .c = 0x78, .l = 7 },
+ [0xf3] = { .c = 0x78, .l = 7 },
+ [0xf4] = { .c = 0x79, .l = 7 },
+ [0xf5] = { .c = 0x79, .l = 7 },
+ [0xf6] = { .c = 0x7a, .l = 7 },
+ [0xf7] = { .c = 0x7a, .l = 7 },
+ [0xf8] = { .c = 0x26, .l = 8 },
+ [0xf9] = { .c = 0x2a, .l = 8 },
+ [0xfa] = { .c = 0x2c, .l = 8 },
+ [0xfb] = { .c = 0x3b, .l = 8 },
+ [0xfc] = { .c = 0x58, .l = 8 },
+ [0xfd] = { .c = 0x5a, .l = 8 },
+};
+
+struct rht rht_bit24_17[256] = {
+ [0x00] = { .c = 0x21, .l = 10 },
+ [0x01] = { .c = 0x21, .l = 10 },
+ [0x02] = { .c = 0x21, .l = 10 },
+ [0x03] = { .c = 0x21, .l = 10 },
+ [0x04] = { .c = 0x21, .l = 10 },
+ [0x05] = { .c = 0x21, .l = 10 },
+ [0x06] = { .c = 0x21, .l = 10 },
+ [0x07] = { .c = 0x21, .l = 10 },
+ [0x08] = { .c = 0x21, .l = 10 },
+ [0x09] = { .c = 0x21, .l = 10 },
+ [0x0a] = { .c = 0x21, .l = 10 },
+ [0x0b] = { .c = 0x21, .l = 10 },
+ [0x0c] = { .c = 0x21, .l = 10 },
+ [0x0d] = { .c = 0x21, .l = 10 },
+ [0x0e] = { .c = 0x21, .l = 10 },
+ [0x0f] = { .c = 0x21, .l = 10 },
+ [0x10] = { .c = 0x21, .l = 10 },
+ [0x11] = { .c = 0x21, .l = 10 },
+ [0x12] = { .c = 0x21, .l = 10 },
+ [0x13] = { .c = 0x21, .l = 10 },
+ [0x14] = { .c = 0x21, .l = 10 },
+ [0x15] = { .c = 0x21, .l = 10 },
+ [0x16] = { .c = 0x21, .l = 10 },
+ [0x17] = { .c = 0x21, .l = 10 },
+ [0x18] = { .c = 0x21, .l = 10 },
+ [0x19] = { .c = 0x21, .l = 10 },
+ [0x1a] = { .c = 0x21, .l = 10 },
+ [0x1b] = { .c = 0x21, .l = 10 },
+ [0x1c] = { .c = 0x21, .l = 10 },
+ [0x1d] = { .c = 0x21, .l = 10 },
+ [0x1e] = { .c = 0x21, .l = 10 },
+ [0x1f] = { .c = 0x21, .l = 10 },
+ [0x20] = { .c = 0x22, .l = 10 },
+ [0x21] = { .c = 0x22, .l = 10 },
+ [0x22] = { .c = 0x22, .l = 10 },
+ [0x23] = { .c = 0x22, .l = 10 },
+ [0x24] = { .c = 0x22, .l = 10 },
+ [0x25] = { .c = 0x22, .l = 10 },
+ [0x26] = { .c = 0x22, .l = 10 },
+ [0x27] = { .c = 0x22, .l = 10 },
+ [0x28] = { .c = 0x22, .l = 10 },
+ [0x29] = { .c = 0x22, .l = 10 },
+ [0x2a] = { .c = 0x22, .l = 10 },
+ [0x2b] = { .c = 0x22, .l = 10 },
+ [0x2c] = { .c = 0x22, .l = 10 },
+ [0x2d] = { .c = 0x22, .l = 10 },
+ [0x2e] = { .c = 0x22, .l = 10 },
+ [0x2f] = { .c = 0x22, .l = 10 },
+ [0x30] = { .c = 0x22, .l = 10 },
+ [0x31] = { .c = 0x22, .l = 10 },
+ [0x32] = { .c = 0x22, .l = 10 },
+ [0x33] = { .c = 0x22, .l = 10 },
+ [0x34] = { .c = 0x22, .l = 10 },
+ [0x35] = { .c = 0x22, .l = 10 },
+ [0x36] = { .c = 0x22, .l = 10 },
+ [0x37] = { .c = 0x22, .l = 10 },
+ [0x38] = { .c = 0x22, .l = 10 },
+ [0x39] = { .c = 0x22, .l = 10 },
+ [0x3a] = { .c = 0x22, .l = 10 },
+ [0x3b] = { .c = 0x22, .l = 10 },
+ [0x3c] = { .c = 0x22, .l = 10 },
+ [0x3d] = { .c = 0x22, .l = 10 },
+ [0x3e] = { .c = 0x22, .l = 10 },
+ [0x3f] = { .c = 0x22, .l = 10 },
+ [0x40] = { .c = 0x28, .l = 10 },
+ [0x41] = { .c = 0x28, .l = 10 },
+ [0x42] = { .c = 0x28, .l = 10 },
+ [0x43] = { .c = 0x28, .l = 10 },
+ [0x44] = { .c = 0x28, .l = 10 },
+ [0x45] = { .c = 0x28, .l = 10 },
+ [0x46] = { .c = 0x28, .l = 10 },
+ [0x47] = { .c = 0x28, .l = 10 },
+ [0x48] = { .c = 0x28, .l = 10 },
+ [0x49] = { .c = 0x28, .l = 10 },
+ [0x4a] = { .c = 0x28, .l = 10 },
+ [0x4b] = { .c = 0x28, .l = 10 },
+ [0x4c] = { .c = 0x28, .l = 10 },
+ [0x4d] = { .c = 0x28, .l = 10 },
+ [0x4e] = { .c = 0x28, .l = 10 },
+ [0x4f] = { .c = 0x28, .l = 10 },
+ [0x50] = { .c = 0x28, .l = 10 },
+ [0x51] = { .c = 0x28, .l = 10 },
+ [0x52] = { .c = 0x28, .l = 10 },
+ [0x53] = { .c = 0x28, .l = 10 },
+ [0x54] = { .c = 0x28, .l = 10 },
+ [0x55] = { .c = 0x28, .l = 10 },
+ [0x56] = { .c = 0x28, .l = 10 },
+ [0x57] = { .c = 0x28, .l = 10 },
+ [0x58] = { .c = 0x28, .l = 10 },
+ [0x59] = { .c = 0x28, .l = 10 },
+ [0x5a] = { .c = 0x28, .l = 10 },
+ [0x5b] = { .c = 0x28, .l = 10 },
+ [0x5c] = { .c = 0x28, .l = 10 },
+ [0x5d] = { .c = 0x28, .l = 10 },
+ [0x5e] = { .c = 0x28, .l = 10 },
+ [0x5f] = { .c = 0x28, .l = 10 },
+ [0x60] = { .c = 0x29, .l = 10 },
+ [0x61] = { .c = 0x29, .l = 10 },
+ [0x62] = { .c = 0x29, .l = 10 },
+ [0x63] = { .c = 0x29, .l = 10 },
+ [0x64] = { .c = 0x29, .l = 10 },
+ [0x65] = { .c = 0x29, .l = 10 },
+ [0x66] = { .c = 0x29, .l = 10 },
+ [0x67] = { .c = 0x29, .l = 10 },
+ [0x68] = { .c = 0x29, .l = 10 },
+ [0x69] = { .c = 0x29, .l = 10 },
+ [0x6a] = { .c = 0x29, .l = 10 },
+ [0x6b] = { .c = 0x29, .l = 10 },
+ [0x6c] = { .c = 0x29, .l = 10 },
+ [0x6d] = { .c = 0x29, .l = 10 },
+ [0x6e] = { .c = 0x29, .l = 10 },
+ [0x6f] = { .c = 0x29, .l = 10 },
+ [0x70] = { .c = 0x29, .l = 10 },
+ [0x71] = { .c = 0x29, .l = 10 },
+ [0x72] = { .c = 0x29, .l = 10 },
+ [0x73] = { .c = 0x29, .l = 10 },
+ [0x74] = { .c = 0x29, .l = 10 },
+ [0x75] = { .c = 0x29, .l = 10 },
+ [0x76] = { .c = 0x29, .l = 10 },
+ [0x77] = { .c = 0x29, .l = 10 },
+ [0x78] = { .c = 0x29, .l = 10 },
+ [0x79] = { .c = 0x29, .l = 10 },
+ [0x7a] = { .c = 0x29, .l = 10 },
+ [0x7b] = { .c = 0x29, .l = 10 },
+ [0x7c] = { .c = 0x29, .l = 10 },
+ [0x7d] = { .c = 0x29, .l = 10 },
+ [0x7e] = { .c = 0x29, .l = 10 },
+ [0x7f] = { .c = 0x29, .l = 10 },
+ [0x80] = { .c = 0x3f, .l = 10 },
+ [0x81] = { .c = 0x3f, .l = 10 },
+ [0x82] = { .c = 0x3f, .l = 10 },
+ [0x83] = { .c = 0x3f, .l = 10 },
+ [0x84] = { .c = 0x3f, .l = 10 },
+ [0x85] = { .c = 0x3f, .l = 10 },
+ [0x86] = { .c = 0x3f, .l = 10 },
+ [0x87] = { .c = 0x3f, .l = 10 },
+ [0x88] = { .c = 0x3f, .l = 10 },
+ [0x89] = { .c = 0x3f, .l = 10 },
+ [0x8a] = { .c = 0x3f, .l = 10 },
+ [0x8b] = { .c = 0x3f, .l = 10 },
+ [0x8c] = { .c = 0x3f, .l = 10 },
+ [0x8d] = { .c = 0x3f, .l = 10 },
+ [0x8e] = { .c = 0x3f, .l = 10 },
+ [0x8f] = { .c = 0x3f, .l = 10 },
+ [0x90] = { .c = 0x3f, .l = 10 },
+ [0x91] = { .c = 0x3f, .l = 10 },
+ [0x92] = { .c = 0x3f, .l = 10 },
+ [0x93] = { .c = 0x3f, .l = 10 },
+ [0x94] = { .c = 0x3f, .l = 10 },
+ [0x95] = { .c = 0x3f, .l = 10 },
+ [0x96] = { .c = 0x3f, .l = 10 },
+ [0x97] = { .c = 0x3f, .l = 10 },
+ [0x98] = { .c = 0x3f, .l = 10 },
+ [0x99] = { .c = 0x3f, .l = 10 },
+ [0x9a] = { .c = 0x3f, .l = 10 },
+ [0x9b] = { .c = 0x3f, .l = 10 },
+ [0x9c] = { .c = 0x3f, .l = 10 },
+ [0x9d] = { .c = 0x3f, .l = 10 },
+ [0x9e] = { .c = 0x3f, .l = 10 },
+ [0x9f] = { .c = 0x3f, .l = 10 },
+ [0xa0] = { .c = 0x27, .l = 11 },
+ [0xa1] = { .c = 0x27, .l = 11 },
+ [0xa2] = { .c = 0x27, .l = 11 },
+ [0xa3] = { .c = 0x27, .l = 11 },
+ [0xa4] = { .c = 0x27, .l = 11 },
+ [0xa5] = { .c = 0x27, .l = 11 },
+ [0xa6] = { .c = 0x27, .l = 11 },
+ [0xa7] = { .c = 0x27, .l = 11 },
+ [0xa8] = { .c = 0x27, .l = 11 },
+ [0xa9] = { .c = 0x27, .l = 11 },
+ [0xaa] = { .c = 0x27, .l = 11 },
+ [0xab] = { .c = 0x27, .l = 11 },
+ [0xac] = { .c = 0x27, .l = 11 },
+ [0xad] = { .c = 0x27, .l = 11 },
+ [0xae] = { .c = 0x27, .l = 11 },
+ [0xaf] = { .c = 0x27, .l = 11 },
+ [0xb0] = { .c = 0x2b, .l = 11 },
+ [0xb1] = { .c = 0x2b, .l = 11 },
+ [0xb2] = { .c = 0x2b, .l = 11 },
+ [0xb3] = { .c = 0x2b, .l = 11 },
+ [0xb4] = { .c = 0x2b, .l = 11 },
+ [0xb5] = { .c = 0x2b, .l = 11 },
+ [0xb6] = { .c = 0x2b, .l = 11 },
+ [0xb7] = { .c = 0x2b, .l = 11 },
+ [0xb8] = { .c = 0x2b, .l = 11 },
+ [0xb9] = { .c = 0x2b, .l = 11 },
+ [0xba] = { .c = 0x2b, .l = 11 },
+ [0xbb] = { .c = 0x2b, .l = 11 },
+ [0xbc] = { .c = 0x2b, .l = 11 },
+ [0xbd] = { .c = 0x2b, .l = 11 },
+ [0xbe] = { .c = 0x2b, .l = 11 },
+ [0xbf] = { .c = 0x2b, .l = 11 },
+ [0xc0] = { .c = 0x7c, .l = 11 },
+ [0xc1] = { .c = 0x7c, .l = 11 },
+ [0xc2] = { .c = 0x7c, .l = 11 },
+ [0xc3] = { .c = 0x7c, .l = 11 },
+ [0xc4] = { .c = 0x7c, .l = 11 },
+ [0xc5] = { .c = 0x7c, .l = 11 },
+ [0xc6] = { .c = 0x7c, .l = 11 },
+ [0xc7] = { .c = 0x7c, .l = 11 },
+ [0xc8] = { .c = 0x7c, .l = 11 },
+ [0xc9] = { .c = 0x7c, .l = 11 },
+ [0xca] = { .c = 0x7c, .l = 11 },
+ [0xcb] = { .c = 0x7c, .l = 11 },
+ [0xcc] = { .c = 0x7c, .l = 11 },
+ [0xcd] = { .c = 0x7c, .l = 11 },
+ [0xce] = { .c = 0x7c, .l = 11 },
+ [0xcf] = { .c = 0x7c, .l = 11 },
+ [0xd0] = { .c = 0x23, .l = 12 },
+ [0xd1] = { .c = 0x23, .l = 12 },
+ [0xd2] = { .c = 0x23, .l = 12 },
+ [0xd3] = { .c = 0x23, .l = 12 },
+ [0xd4] = { .c = 0x23, .l = 12 },
+ [0xd5] = { .c = 0x23, .l = 12 },
+ [0xd6] = { .c = 0x23, .l = 12 },
+ [0xd7] = { .c = 0x23, .l = 12 },
+ [0xd8] = { .c = 0x3e, .l = 12 },
+ [0xd9] = { .c = 0x3e, .l = 12 },
+ [0xda] = { .c = 0x3e, .l = 12 },
+ [0xdb] = { .c = 0x3e, .l = 12 },
+ [0xdc] = { .c = 0x3e, .l = 12 },
+ [0xdd] = { .c = 0x3e, .l = 12 },
+ [0xde] = { .c = 0x3e, .l = 12 },
+ [0xdf] = { .c = 0x3e, .l = 12 },
+ [0xe0] = { .c = 0x00, .l = 13 },
+ [0xe1] = { .c = 0x00, .l = 13 },
+ [0xe2] = { .c = 0x00, .l = 13 },
+ [0xe3] = { .c = 0x00, .l = 13 },
+ [0xe4] = { .c = 0x24, .l = 13 },
+ [0xe5] = { .c = 0x24, .l = 13 },
+ [0xe6] = { .c = 0x24, .l = 13 },
+ [0xe7] = { .c = 0x24, .l = 13 },
+ [0xe8] = { .c = 0x40, .l = 13 },
+ [0xe9] = { .c = 0x40, .l = 13 },
+ [0xea] = { .c = 0x40, .l = 13 },
+ [0xeb] = { .c = 0x40, .l = 13 },
+ [0xec] = { .c = 0x5b, .l = 13 },
+ [0xed] = { .c = 0x5b, .l = 13 },
+ [0xee] = { .c = 0x5b, .l = 13 },
+ [0xef] = { .c = 0x5b, .l = 13 },
+ [0xf0] = { .c = 0x5d, .l = 13 },
+ [0xf1] = { .c = 0x5d, .l = 13 },
+ [0xf2] = { .c = 0x5d, .l = 13 },
+ [0xf3] = { .c = 0x5d, .l = 13 },
+ [0xf4] = { .c = 0x7e, .l = 13 },
+ [0xf5] = { .c = 0x7e, .l = 13 },
+ [0xf6] = { .c = 0x7e, .l = 13 },
+ [0xf7] = { .c = 0x7e, .l = 13 },
+ [0xf8] = { .c = 0x5e, .l = 14 },
+ [0xf9] = { .c = 0x5e, .l = 14 },
+ [0xfa] = { .c = 0x7d, .l = 14 },
+ [0xfb] = { .c = 0x7d, .l = 14 },
+ [0xfc] = { .c = 0x3c, .l = 15 },
+ [0xfd] = { .c = 0x60, .l = 15 },
+ [0xfe] = { .c = 0x7b, .l = 15 },
+};
+
+struct rht rht_bit15_11_fe[32] = {
+ [0x00] = { .c = 0x5c, .l = 19 },
+ [0x01] = { .c = 0x5c, .l = 19 },
+ [0x02] = { .c = 0x5c, .l = 19 },
+ [0x03] = { .c = 0x5c, .l = 19 },
+ [0x04] = { .c = 0xc3, .l = 19 },
+ [0x05] = { .c = 0xc3, .l = 19 },
+ [0x06] = { .c = 0xc3, .l = 19 },
+ [0x07] = { .c = 0xc3, .l = 19 },
+ [0x08] = { .c = 0xd0, .l = 19 },
+ [0x09] = { .c = 0xd0, .l = 19 },
+ [0x0a] = { .c = 0xd0, .l = 19 },
+ [0x0b] = { .c = 0xd0, .l = 19 },
+ [0x0c] = { .c = 0x80, .l = 20 },
+ [0x0d] = { .c = 0x80, .l = 20 },
+ [0x0e] = { .c = 0x82, .l = 20 },
+ [0x0f] = { .c = 0x82, .l = 20 },
+ [0x10] = { .c = 0x83, .l = 20 },
+ [0x11] = { .c = 0x83, .l = 20 },
+ [0x12] = { .c = 0xa2, .l = 20 },
+ [0x13] = { .c = 0xa2, .l = 20 },
+ [0x14] = { .c = 0xb8, .l = 20 },
+ [0x15] = { .c = 0xb8, .l = 20 },
+ [0x16] = { .c = 0xc2, .l = 20 },
+ [0x17] = { .c = 0xc2, .l = 20 },
+ [0x18] = { .c = 0xe0, .l = 20 },
+ [0x19] = { .c = 0xe0, .l = 20 },
+ [0x1a] = { .c = 0xe2, .l = 20 },
+ [0x1b] = { .c = 0xe2, .l = 20 },
+ [0x1c] = { .c = 0x99, .l = 21 },
+ [0x1d] = { .c = 0xa1, .l = 21 },
+ [0x1e] = { .c = 0xa7, .l = 21 },
+ [0x1f] = { .c = 0xac, .l = 21 },
+};
+
+struct rht rht_bit15_8[256] = {
+ [0x00] = { .c = 0xb0, .l = 21 },
+ [0x01] = { .c = 0xb0, .l = 21 },
+ [0x02] = { .c = 0xb0, .l = 21 },
+ [0x03] = { .c = 0xb0, .l = 21 },
+ [0x04] = { .c = 0xb0, .l = 21 },
+ [0x05] = { .c = 0xb0, .l = 21 },
+ [0x06] = { .c = 0xb0, .l = 21 },
+ [0x07] = { .c = 0xb0, .l = 21 },
+ [0x08] = { .c = 0xb1, .l = 21 },
+ [0x09] = { .c = 0xb1, .l = 21 },
+ [0x0a] = { .c = 0xb1, .l = 21 },
+ [0x0b] = { .c = 0xb1, .l = 21 },
+ [0x0c] = { .c = 0xb1, .l = 21 },
+ [0x0d] = { .c = 0xb1, .l = 21 },
+ [0x0e] = { .c = 0xb1, .l = 21 },
+ [0x0f] = { .c = 0xb1, .l = 21 },
+ [0x10] = { .c = 0xb3, .l = 21 },
+ [0x11] = { .c = 0xb3, .l = 21 },
+ [0x12] = { .c = 0xb3, .l = 21 },
+ [0x13] = { .c = 0xb3, .l = 21 },
+ [0x14] = { .c = 0xb3, .l = 21 },
+ [0x15] = { .c = 0xb3, .l = 21 },
+ [0x16] = { .c = 0xb3, .l = 21 },
+ [0x17] = { .c = 0xb3, .l = 21 },
+ [0x18] = { .c = 0xd1, .l = 21 },
+ [0x19] = { .c = 0xd1, .l = 21 },
+ [0x1a] = { .c = 0xd1, .l = 21 },
+ [0x1b] = { .c = 0xd1, .l = 21 },
+ [0x1c] = { .c = 0xd1, .l = 21 },
+ [0x1d] = { .c = 0xd1, .l = 21 },
+ [0x1e] = { .c = 0xd1, .l = 21 },
+ [0x1f] = { .c = 0xd1, .l = 21 },
+ [0x20] = { .c = 0xd8, .l = 21 },
+ [0x21] = { .c = 0xd8, .l = 21 },
+ [0x22] = { .c = 0xd8, .l = 21 },
+ [0x23] = { .c = 0xd8, .l = 21 },
+ [0x24] = { .c = 0xd8, .l = 21 },
+ [0x25] = { .c = 0xd8, .l = 21 },
+ [0x26] = { .c = 0xd8, .l = 21 },
+ [0x27] = { .c = 0xd8, .l = 21 },
+ [0x28] = { .c = 0xd9, .l = 21 },
+ [0x29] = { .c = 0xd9, .l = 21 },
+ [0x2a] = { .c = 0xd9, .l = 21 },
+ [0x2b] = { .c = 0xd9, .l = 21 },
+ [0x2c] = { .c = 0xd9, .l = 21 },
+ [0x2d] = { .c = 0xd9, .l = 21 },
+ [0x2e] = { .c = 0xd9, .l = 21 },
+ [0x2f] = { .c = 0xd9, .l = 21 },
+ [0x30] = { .c = 0xe3, .l = 21 },
+ [0x31] = { .c = 0xe3, .l = 21 },
+ [0x32] = { .c = 0xe3, .l = 21 },
+ [0x33] = { .c = 0xe3, .l = 21 },
+ [0x34] = { .c = 0xe3, .l = 21 },
+ [0x35] = { .c = 0xe3, .l = 21 },
+ [0x36] = { .c = 0xe3, .l = 21 },
+ [0x37] = { .c = 0xe3, .l = 21 },
+ [0x38] = { .c = 0xe5, .l = 21 },
+ [0x39] = { .c = 0xe5, .l = 21 },
+ [0x3a] = { .c = 0xe5, .l = 21 },
+ [0x3b] = { .c = 0xe5, .l = 21 },
+ [0x3c] = { .c = 0xe5, .l = 21 },
+ [0x3d] = { .c = 0xe5, .l = 21 },
+ [0x3e] = { .c = 0xe5, .l = 21 },
+ [0x3f] = { .c = 0xe5, .l = 21 },
+ [0x40] = { .c = 0xe6, .l = 21 },
+ [0x41] = { .c = 0xe6, .l = 21 },
+ [0x42] = { .c = 0xe6, .l = 21 },
+ [0x43] = { .c = 0xe6, .l = 21 },
+ [0x44] = { .c = 0xe6, .l = 21 },
+ [0x45] = { .c = 0xe6, .l = 21 },
+ [0x46] = { .c = 0xe6, .l = 21 },
+ [0x47] = { .c = 0xe6, .l = 21 },
+ [0x48] = { .c = 0x81, .l = 22 },
+ [0x49] = { .c = 0x81, .l = 22 },
+ [0x4a] = { .c = 0x81, .l = 22 },
+ [0x4b] = { .c = 0x81, .l = 22 },
+ [0x4c] = { .c = 0x84, .l = 22 },
+ [0x4d] = { .c = 0x84, .l = 22 },
+ [0x4e] = { .c = 0x84, .l = 22 },
+ [0x4f] = { .c = 0x84, .l = 22 },
+ [0x50] = { .c = 0x85, .l = 22 },
+ [0x51] = { .c = 0x85, .l = 22 },
+ [0x52] = { .c = 0x85, .l = 22 },
+ [0x53] = { .c = 0x85, .l = 22 },
+ [0x54] = { .c = 0x86, .l = 22 },
+ [0x55] = { .c = 0x86, .l = 22 },
+ [0x56] = { .c = 0x86, .l = 22 },
+ [0x57] = { .c = 0x86, .l = 22 },
+ [0x58] = { .c = 0x88, .l = 22 },
+ [0x59] = { .c = 0x88, .l = 22 },
+ [0x5a] = { .c = 0x88, .l = 22 },
+ [0x5b] = { .c = 0x88, .l = 22 },
+ [0x5c] = { .c = 0x92, .l = 22 },
+ [0x5d] = { .c = 0x92, .l = 22 },
+ [0x5e] = { .c = 0x92, .l = 22 },
+ [0x5f] = { .c = 0x92, .l = 22 },
+ [0x60] = { .c = 0x9a, .l = 22 },
+ [0x61] = { .c = 0x9a, .l = 22 },
+ [0x62] = { .c = 0x9a, .l = 22 },
+ [0x63] = { .c = 0x9a, .l = 22 },
+ [0x64] = { .c = 0x9c, .l = 22 },
+ [0x65] = { .c = 0x9c, .l = 22 },
+ [0x66] = { .c = 0x9c, .l = 22 },
+ [0x67] = { .c = 0x9c, .l = 22 },
+ [0x68] = { .c = 0xa0, .l = 22 },
+ [0x69] = { .c = 0xa0, .l = 22 },
+ [0x6a] = { .c = 0xa0, .l = 22 },
+ [0x6b] = { .c = 0xa0, .l = 22 },
+ [0x6c] = { .c = 0xa3, .l = 22 },
+ [0x6d] = { .c = 0xa3, .l = 22 },
+ [0x6e] = { .c = 0xa3, .l = 22 },
+ [0x6f] = { .c = 0xa3, .l = 22 },
+ [0x70] = { .c = 0xa4, .l = 22 },
+ [0x71] = { .c = 0xa4, .l = 22 },
+ [0x72] = { .c = 0xa4, .l = 22 },
+ [0x73] = { .c = 0xa4, .l = 22 },
+ [0x74] = { .c = 0xa9, .l = 22 },
+ [0x75] = { .c = 0xa9, .l = 22 },
+ [0x76] = { .c = 0xa9, .l = 22 },
+ [0x77] = { .c = 0xa9, .l = 22 },
+ [0x78] = { .c = 0xaa, .l = 22 },
+ [0x79] = { .c = 0xaa, .l = 22 },
+ [0x7a] = { .c = 0xaa, .l = 22 },
+ [0x7b] = { .c = 0xaa, .l = 22 },
+ [0x7c] = { .c = 0xad, .l = 22 },
+ [0x7d] = { .c = 0xad, .l = 22 },
+ [0x7e] = { .c = 0xad, .l = 22 },
+ [0x7f] = { .c = 0xad, .l = 22 },
+ [0x80] = { .c = 0xb2, .l = 22 },
+ [0x81] = { .c = 0xb2, .l = 22 },
+ [0x82] = { .c = 0xb2, .l = 22 },
+ [0x83] = { .c = 0xb2, .l = 22 },
+ [0x84] = { .c = 0xb5, .l = 22 },
+ [0x85] = { .c = 0xb5, .l = 22 },
+ [0x86] = { .c = 0xb5, .l = 22 },
+ [0x87] = { .c = 0xb5, .l = 22 },
+ [0x88] = { .c = 0xb9, .l = 22 },
+ [0x89] = { .c = 0xb9, .l = 22 },
+ [0x8a] = { .c = 0xb9, .l = 22 },
+ [0x8b] = { .c = 0xb9, .l = 22 },
+ [0x8c] = { .c = 0xba, .l = 22 },
+ [0x8d] = { .c = 0xba, .l = 22 },
+ [0x8e] = { .c = 0xba, .l = 22 },
+ [0x8f] = { .c = 0xba, .l = 22 },
+ [0x90] = { .c = 0xbb, .l = 22 },
+ [0x91] = { .c = 0xbb, .l = 22 },
+ [0x92] = { .c = 0xbb, .l = 22 },
+ [0x93] = { .c = 0xbb, .l = 22 },
+ [0x94] = { .c = 0xbd, .l = 22 },
+ [0x95] = { .c = 0xbd, .l = 22 },
+ [0x96] = { .c = 0xbd, .l = 22 },
+ [0x97] = { .c = 0xbd, .l = 22 },
+ [0x98] = { .c = 0xbe, .l = 22 },
+ [0x99] = { .c = 0xbe, .l = 22 },
+ [0x9a] = { .c = 0xbe, .l = 22 },
+ [0x9b] = { .c = 0xbe, .l = 22 },
+ [0x9c] = { .c = 0xc4, .l = 22 },
+ [0x9d] = { .c = 0xc4, .l = 22 },
+ [0x9e] = { .c = 0xc4, .l = 22 },
+ [0x9f] = { .c = 0xc4, .l = 22 },
+ [0xa0] = { .c = 0xc6, .l = 22 },
+ [0xa1] = { .c = 0xc6, .l = 22 },
+ [0xa2] = { .c = 0xc6, .l = 22 },
+ [0xa3] = { .c = 0xc6, .l = 22 },
+ [0xa4] = { .c = 0xe4, .l = 22 },
+ [0xa5] = { .c = 0xe4, .l = 22 },
+ [0xa6] = { .c = 0xe4, .l = 22 },
+ [0xa7] = { .c = 0xe4, .l = 22 },
+ [0xa8] = { .c = 0xe8, .l = 22 },
+ [0xa9] = { .c = 0xe8, .l = 22 },
+ [0xaa] = { .c = 0xe8, .l = 22 },
+ [0xab] = { .c = 0xe8, .l = 22 },
+ [0xac] = { .c = 0xe9, .l = 22 },
+ [0xad] = { .c = 0xe9, .l = 22 },
+ [0xae] = { .c = 0xe9, .l = 22 },
+ [0xaf] = { .c = 0xe9, .l = 22 },
+ [0xb0] = { .c = 0x01, .l = 23 },
+ [0xb1] = { .c = 0x01, .l = 23 },
+ [0xb2] = { .c = 0x87, .l = 23 },
+ [0xb3] = { .c = 0x87, .l = 23 },
+ [0xb4] = { .c = 0x89, .l = 23 },
+ [0xb5] = { .c = 0x89, .l = 23 },
+ [0xb6] = { .c = 0x8a, .l = 23 },
+ [0xb7] = { .c = 0x8a, .l = 23 },
+ [0xb8] = { .c = 0x8b, .l = 23 },
+ [0xb9] = { .c = 0x8b, .l = 23 },
+ [0xba] = { .c = 0x8c, .l = 23 },
+ [0xbb] = { .c = 0x8c, .l = 23 },
+ [0xbc] = { .c = 0x8d, .l = 23 },
+ [0xbd] = { .c = 0x8d, .l = 23 },
+ [0xbe] = { .c = 0x8f, .l = 23 },
+ [0xbf] = { .c = 0x8f, .l = 23 },
+ [0xc0] = { .c = 0x93, .l = 23 },
+ [0xc1] = { .c = 0x93, .l = 23 },
+ [0xc2] = { .c = 0x95, .l = 23 },
+ [0xc3] = { .c = 0x95, .l = 23 },
+ [0xc4] = { .c = 0x96, .l = 23 },
+ [0xc5] = { .c = 0x96, .l = 23 },
+ [0xc6] = { .c = 0x97, .l = 23 },
+ [0xc7] = { .c = 0x97, .l = 23 },
+ [0xc8] = { .c = 0x98, .l = 23 },
+ [0xc9] = { .c = 0x98, .l = 23 },
+ [0xca] = { .c = 0x9b, .l = 23 },
+ [0xcb] = { .c = 0x9b, .l = 23 },
+ [0xcc] = { .c = 0x9d, .l = 23 },
+ [0xcd] = { .c = 0x9d, .l = 23 },
+ [0xce] = { .c = 0x9e, .l = 23 },
+ [0xcf] = { .c = 0x9e, .l = 23 },
+ [0xd0] = { .c = 0xa5, .l = 23 },
+ [0xd1] = { .c = 0xa5, .l = 23 },
+ [0xd2] = { .c = 0xa6, .l = 23 },
+ [0xd3] = { .c = 0xa6, .l = 23 },
+ [0xd4] = { .c = 0xa8, .l = 23 },
+ [0xd5] = { .c = 0xa8, .l = 23 },
+ [0xd6] = { .c = 0xae, .l = 23 },
+ [0xd7] = { .c = 0xae, .l = 23 },
+ [0xd8] = { .c = 0xaf, .l = 23 },
+ [0xd9] = { .c = 0xaf, .l = 23 },
+ [0xda] = { .c = 0xb4, .l = 23 },
+ [0xdb] = { .c = 0xb4, .l = 23 },
+ [0xdc] = { .c = 0xb6, .l = 23 },
+ [0xdd] = { .c = 0xb6, .l = 23 },
+ [0xde] = { .c = 0xb7, .l = 23 },
+ [0xdf] = { .c = 0xb7, .l = 23 },
+ [0xe0] = { .c = 0xbc, .l = 23 },
+ [0xe1] = { .c = 0xbc, .l = 23 },
+ [0xe2] = { .c = 0xbf, .l = 23 },
+ [0xe3] = { .c = 0xbf, .l = 23 },
+ [0xe4] = { .c = 0xc5, .l = 23 },
+ [0xe5] = { .c = 0xc5, .l = 23 },
+ [0xe6] = { .c = 0xe7, .l = 23 },
+ [0xe7] = { .c = 0xe7, .l = 23 },
+ [0xe8] = { .c = 0xef, .l = 23 },
+ [0xe9] = { .c = 0xef, .l = 23 },
+ [0xea] = { .c = 0x09, .l = 24 },
+ [0xeb] = { .c = 0x8e, .l = 24 },
+ [0xec] = { .c = 0x90, .l = 24 },
+ [0xed] = { .c = 0x91, .l = 24 },
+ [0xee] = { .c = 0x94, .l = 24 },
+ [0xef] = { .c = 0x9f, .l = 24 },
+ [0xf0] = { .c = 0xab, .l = 24 },
+ [0xf1] = { .c = 0xce, .l = 24 },
+ [0xf2] = { .c = 0xd7, .l = 24 },
+ [0xf3] = { .c = 0xe1, .l = 24 },
+ [0xf4] = { .c = 0xec, .l = 24 },
+ [0xf5] = { .c = 0xed, .l = 24 },
+};
+
+struct rht rht_bit11_4[256] = {
+ [0x60] = { .c = 0xc7, .l = 25 },
+ [0x61] = { .c = 0xc7, .l = 25 },
+ [0x62] = { .c = 0xc7, .l = 25 },
+ [0x63] = { .c = 0xc7, .l = 25 },
+ [0x64] = { .c = 0xc7, .l = 25 },
+ [0x65] = { .c = 0xc7, .l = 25 },
+ [0x66] = { .c = 0xc7, .l = 25 },
+ [0x67] = { .c = 0xc7, .l = 25 },
+ [0x68] = { .c = 0xcf, .l = 25 },
+ [0x69] = { .c = 0xcf, .l = 25 },
+ [0x6a] = { .c = 0xcf, .l = 25 },
+ [0x6b] = { .c = 0xcf, .l = 25 },
+ [0x6c] = { .c = 0xcf, .l = 25 },
+ [0x6d] = { .c = 0xcf, .l = 25 },
+ [0x6e] = { .c = 0xcf, .l = 25 },
+ [0x6f] = { .c = 0xcf, .l = 25 },
+ [0x70] = { .c = 0xea, .l = 25 },
+ [0x71] = { .c = 0xea, .l = 25 },
+ [0x72] = { .c = 0xea, .l = 25 },
+ [0x73] = { .c = 0xea, .l = 25 },
+ [0x74] = { .c = 0xea, .l = 25 },
+ [0x75] = { .c = 0xea, .l = 25 },
+ [0x76] = { .c = 0xea, .l = 25 },
+ [0x77] = { .c = 0xea, .l = 25 },
+ [0x78] = { .c = 0xeb, .l = 25 },
+ [0x79] = { .c = 0xeb, .l = 25 },
+ [0x7a] = { .c = 0xeb, .l = 25 },
+ [0x7b] = { .c = 0xeb, .l = 25 },
+ [0x7c] = { .c = 0xeb, .l = 25 },
+ [0x7d] = { .c = 0xeb, .l = 25 },
+ [0x7e] = { .c = 0xeb, .l = 25 },
+ [0x7f] = { .c = 0xeb, .l = 25 },
+ [0x80] = { .c = 0xc0, .l = 26 },
+ [0x81] = { .c = 0xc0, .l = 26 },
+ [0x82] = { .c = 0xc0, .l = 26 },
+ [0x83] = { .c = 0xc0, .l = 26 },
+ [0x84] = { .c = 0xc1, .l = 26 },
+ [0x85] = { .c = 0xc1, .l = 26 },
+ [0x86] = { .c = 0xc1, .l = 26 },
+ [0x87] = { .c = 0xc1, .l = 26 },
+ [0x88] = { .c = 0xc8, .l = 26 },
+ [0x89] = { .c = 0xc8, .l = 26 },
+ [0x8a] = { .c = 0xc8, .l = 26 },
+ [0x8b] = { .c = 0xc8, .l = 26 },
+ [0x8c] = { .c = 0xc9, .l = 26 },
+ [0x8d] = { .c = 0xc9, .l = 26 },
+ [0x8e] = { .c = 0xc9, .l = 26 },
+ [0x8f] = { .c = 0xc9, .l = 26 },
+ [0x90] = { .c = 0xca, .l = 26 },
+ [0x91] = { .c = 0xca, .l = 26 },
+ [0x92] = { .c = 0xca, .l = 26 },
+ [0x93] = { .c = 0xca, .l = 26 },
+ [0x94] = { .c = 0xcd, .l = 26 },
+ [0x95] = { .c = 0xcd, .l = 26 },
+ [0x96] = { .c = 0xcd, .l = 26 },
+ [0x97] = { .c = 0xcd, .l = 26 },
+ [0x98] = { .c = 0xd2, .l = 26 },
+ [0x99] = { .c = 0xd2, .l = 26 },
+ [0x9a] = { .c = 0xd2, .l = 26 },
+ [0x9b] = { .c = 0xd2, .l = 26 },
+ [0x9c] = { .c = 0xd5, .l = 26 },
+ [0x9d] = { .c = 0xd5, .l = 26 },
+ [0x9e] = { .c = 0xd5, .l = 26 },
+ [0x9f] = { .c = 0xd5, .l = 26 },
+ [0xa0] = { .c = 0xda, .l = 26 },
+ [0xa1] = { .c = 0xda, .l = 26 },
+ [0xa2] = { .c = 0xda, .l = 26 },
+ [0xa3] = { .c = 0xda, .l = 26 },
+ [0xa4] = { .c = 0xdb, .l = 26 },
+ [0xa5] = { .c = 0xdb, .l = 26 },
+ [0xa6] = { .c = 0xdb, .l = 26 },
+ [0xa7] = { .c = 0xdb, .l = 26 },
+ [0xa8] = { .c = 0xee, .l = 26 },
+ [0xa9] = { .c = 0xee, .l = 26 },
+ [0xaa] = { .c = 0xee, .l = 26 },
+ [0xab] = { .c = 0xee, .l = 26 },
+ [0xac] = { .c = 0xf0, .l = 26 },
+ [0xad] = { .c = 0xf0, .l = 26 },
+ [0xae] = { .c = 0xf0, .l = 26 },
+ [0xaf] = { .c = 0xf0, .l = 26 },
+ [0xb0] = { .c = 0xf2, .l = 26 },
+ [0xb1] = { .c = 0xf2, .l = 26 },
+ [0xb2] = { .c = 0xf2, .l = 26 },
+ [0xb3] = { .c = 0xf2, .l = 26 },
+ [0xb4] = { .c = 0xf3, .l = 26 },
+ [0xb5] = { .c = 0xf3, .l = 26 },
+ [0xb6] = { .c = 0xf3, .l = 26 },
+ [0xb7] = { .c = 0xf3, .l = 26 },
+ [0xb8] = { .c = 0xff, .l = 26 },
+ [0xb9] = { .c = 0xff, .l = 26 },
+ [0xba] = { .c = 0xff, .l = 26 },
+ [0xbb] = { .c = 0xff, .l = 26 },
+ [0xbc] = { .c = 0xcb, .l = 27 },
+ [0xbd] = { .c = 0xcb, .l = 27 },
+ [0xbe] = { .c = 0xcc, .l = 27 },
+ [0xbf] = { .c = 0xcc, .l = 27 },
+ [0xc0] = { .c = 0xd3, .l = 27 },
+ [0xc1] = { .c = 0xd3, .l = 27 },
+ [0xc2] = { .c = 0xd4, .l = 27 },
+ [0xc3] = { .c = 0xd4, .l = 27 },
+ [0xc4] = { .c = 0xd6, .l = 27 },
+ [0xc5] = { .c = 0xd6, .l = 27 },
+ [0xc6] = { .c = 0xdd, .l = 27 },
+ [0xc7] = { .c = 0xdd, .l = 27 },
+ [0xc8] = { .c = 0xde, .l = 27 },
+ [0xc9] = { .c = 0xde, .l = 27 },
+ [0xca] = { .c = 0xdf, .l = 27 },
+ [0xcb] = { .c = 0xdf, .l = 27 },
+ [0xcc] = { .c = 0xf1, .l = 27 },
+ [0xcd] = { .c = 0xf1, .l = 27 },
+ [0xce] = { .c = 0xf4, .l = 27 },
+ [0xcf] = { .c = 0xf4, .l = 27 },
+ [0xd0] = { .c = 0xf5, .l = 27 },
+ [0xd1] = { .c = 0xf5, .l = 27 },
+ [0xd2] = { .c = 0xf6, .l = 27 },
+ [0xd3] = { .c = 0xf6, .l = 27 },
+ [0xd4] = { .c = 0xf7, .l = 27 },
+ [0xd5] = { .c = 0xf7, .l = 27 },
+ [0xd6] = { .c = 0xf8, .l = 27 },
+ [0xd7] = { .c = 0xf8, .l = 27 },
+ [0xd8] = { .c = 0xfa, .l = 27 },
+ [0xd9] = { .c = 0xfa, .l = 27 },
+ [0xda] = { .c = 0xfb, .l = 27 },
+ [0xdb] = { .c = 0xfb, .l = 27 },
+ [0xdc] = { .c = 0xfc, .l = 27 },
+ [0xdd] = { .c = 0xfc, .l = 27 },
+ [0xde] = { .c = 0xfd, .l = 27 },
+ [0xdf] = { .c = 0xfd, .l = 27 },
+ [0xe0] = { .c = 0xfe, .l = 27 },
+ [0xe1] = { .c = 0xfe, .l = 27 },
+ [0xe2] = { .c = 0x02, .l = 28 },
+ [0xe3] = { .c = 0x03, .l = 28 },
+ [0xe4] = { .c = 0x04, .l = 28 },
+ [0xe5] = { .c = 0x05, .l = 28 },
+ [0xe6] = { .c = 0x06, .l = 28 },
+ [0xe7] = { .c = 0x07, .l = 28 },
+ [0xe8] = { .c = 0x08, .l = 28 },
+ [0xe9] = { .c = 0x0b, .l = 28 },
+ [0xea] = { .c = 0x0c, .l = 28 },
+ [0xeb] = { .c = 0x0e, .l = 28 },
+ [0xec] = { .c = 0x0f, .l = 28 },
+ [0xed] = { .c = 0x10, .l = 28 },
+ [0xee] = { .c = 0x11, .l = 28 },
+ [0xef] = { .c = 0x12, .l = 28 },
+ [0xf0] = { .c = 0x13, .l = 28 },
+ [0xf1] = { .c = 0x14, .l = 28 },
+ [0xf2] = { .c = 0x15, .l = 28 },
+ [0xf3] = { .c = 0x17, .l = 28 },
+ [0xf4] = { .c = 0x18, .l = 28 },
+ [0xf5] = { .c = 0x19, .l = 28 },
+ [0xf6] = { .c = 0x1a, .l = 28 },
+ [0xf7] = { .c = 0x1b, .l = 28 },
+ [0xf8] = { .c = 0x1c, .l = 28 },
+ [0xf9] = { .c = 0x1d, .l = 28 },
+ [0xfa] = { .c = 0x1e, .l = 28 },
+ [0xfb] = { .c = 0x1f, .l = 28 },
+ [0xfc] = { .c = 0x7f, .l = 28 },
+ [0xfd] = { .c = 0xdc, .l = 28 },
+ [0xfe] = { .c = 0xf9, .l = 28 },
+ [0xff] = { .c = 0x0a, .l = 30 },
+ /* Note, when l==30, bits 2..3 give 00:0x0a, 01:0x0d, 10:0x16, 11:EOS */
+};
+
+/* huffman-encode string <s> into the huff_tmp buffer and returns the amount
+ * of output bytes. The caller must ensure the output is large enough (ie at
+ * least 4 times as long as s).
+ *
+ * FIXME: bits are only counted for now, no code is emitted!
+ */
+int huff_enc(const char *s, char *out)
+{
+ int bits = 0;
+
+ while (*s) {
+ bits += ht[(uint8_t)*s].b;
+ s++;
+ }
+ bits += 7;
+
+ /* FIXME: huffman code is not emitted yet. */
+ //memset(out, 'H', bits / 8);
+ return bits / 8;
+}
+
+/* pass a huffman string, it will decode it and return the new output size or
+ * -1 in case of error.
+ *
+ * The principle of the decoder is to lookup full bytes in reverse-huffman
+ * tables. Since we may need up to 30 bits and the word positions are not
+ * always multiples of 8, we build the code word by shifting the "current"
+ * 32-bit word and the "next" one of the appropriate amount of bits. Once
+ * the shift goes beyond 32, words are swapped and the "next" one is refilled
+ * with new bytes. Shift operations are cheap when done a single time like this.
+ * On 64-bit platforms it is possible to further improve this by storing both
+ * of them in a single word.
+ */
+int huff_dec(const uint8_t *huff, int hlen, char *out, int olen)
+{
+ char *out_start = out;
+ char *out_end = out + olen;
+ const uint8_t *huff_end = huff + hlen;
+ uint32_t curr = 0;
+ uint32_t next = 0;
+ uint32_t shift;
+ uint32_t code; /* The 30-bit code being looked up, MSB-aligned */
+ uint8_t sym;
+ int bleft; /* bits left */
+ int l;
+
+ code = 0;
+ shift = 64; // start with an empty buffer
+ bleft = hlen << 3;
+ while (bleft > 0 && out != out_end) {
+ while (shift >= 32) {
+ curr = next;
+
+ /* read up to 4 bytes into next. FIXME: this should
+ * later be optimized to perform a single 32-bit big
+ * endian read when unaligned accesses are possible.
+ */
+ next = 0;
+
+ if (huff + 4 <= huff_end) {
+ next = (huff[0] << 24) + (huff[1] << 16) + (huff[2] << 8) + huff[3];
+ huff += 4;
+ }
+ else {
+ /* note: we append 0 and not 0xff so that we can
+ * distinguish shifted bits from a really inserted
+ * EOS.
+ */
+ next = (((huff + 0 < huff_end) ? huff[0] : 0x00) << 24) +
+ (((huff + 1 < huff_end) ? huff[1] : 0x00) << 16) +
+ (((huff + 2 < huff_end) ? huff[2] : 0x00) << 8) +
+ ((huff + 3 < huff_end) ? huff[3] : 0x00);
+ huff = huff_end;
+ }
+
+ shift -= 32;
+ }
+
+ /* curr:next contain 64 bit of huffman code */
+ code = curr;
+ if (shift)
+ code = (code << shift) + (next >> (32 - shift));
+
+ /* now we necessarily have 32 bits available */
+ if ((code >> 24) < 0xfe) {
+ /* single byte */
+ l = rht_bit31_24[code >> 24].l;
+ sym = rht_bit31_24[code >> 24].c;
+ }
+ else if (((code >> 17) & 0xff) < 0xff) {
+ /* two bytes, 0xfe + 2 bits or 0xff + 2..7 bits */
+ l = rht_bit24_17[(code >> 17) & 0xff].l;
+ sym = rht_bit24_17[(code >> 17) & 0xff].c;
+ }
+ else if (((code >> 16) & 0xff) < 0xff) { /* 3..5 bits */
+ /* 0xff + 0xfe + 3..5 bits or
+ * 0xff + 0xff + 5..8 bits for values till 0xf5
+ */
+ l = rht_bit15_11_fe[(code >> 11) & 0x1f].l;
+ sym = rht_bit15_11_fe[(code >> 11) & 0x1f].c;
+ }
+ else if (((code >> 8) & 0xff) < 0xf6) { /* 5..8 bits */
+ /* that's 0xff + 0xff */
+ l = rht_bit15_8[(code >> 8) & 0xff].l;
+ sym = rht_bit15_8[(code >> 8) & 0xff].c;
+ }
+ else {
+ /* 0xff 0xff 0xf6..0xff */
+ l = rht_bit11_4[(code >> 4) & 0xff].l;
+ if (l < 30)
+ sym = rht_bit11_4[(code >> 4) & 0xff].c;
+ else if ((code & 0xff) == 0xf0)
+ sym = 10;
+ else if ((code & 0xff) == 0xf4)
+ sym = 13;
+ else if ((code & 0xff) == 0xf8)
+ sym = 22;
+ else { // 0xfc : EOS
+ break;
+ }
+ }
+
+ if (!l || bleft - l < 0)
+ break;
+
+ bleft -= l;
+ shift += l;
+ *out++ = sym;
+ }
+
+ if (bleft > 0) {
+ /* some bits were not consumed after the last code, they must
+ * match EOS (ie: all ones).
+ */
+ if ((code & -(1 << (32 - bleft))) != (uint32_t)-(1 << (32 - bleft)))
+ return -1;
+ }
+
+ if (out < out_end)
+ *out = 0; // end of string whenever possible
+ return out - out_start;
+}