1/*
2 This file is part of Mtproto-proxy Library.
3
4 Mtproto-proxy Library is free software: you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
8
9 Mtproto-proxy Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with Mtproto-proxy Library. If not, see <http://www.gnu.org/licenses/>.
16
17 Copyright 2009-2012 Vkontakte Ltd
18 2009-2012 Nikolai Durov
19 2009-2012 Andrey Lopatin
20 2012 Anton Maydell
21
22 Copyright 2014 Telegram Messenger Inc
23 2014 Anton Maydell
24*/
25
26#include <stdlib.h>
27#include <math.h>
28#include <assert.h>
29#include <stdint.h>
30
31#include "crc32c.h"
32#include "kprintf.h"
33#include "cpuid.h"
34
35static unsigned crc32c_table[256] = {
360x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4,
370xc79a971f, 0x35f1141c, 0x26a1e7e8, 0xd4ca64eb,
380x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b,
390x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24,
400x105ec76f, 0xe235446c, 0xf165b798, 0x030e349b,
410xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384,
420x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54,
430x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b,
440x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a,
450xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35,
460xaa64d611, 0x580f5512, 0x4b5fa6e6, 0xb93425e5,
470x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa,
480x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45,
490xf779deae, 0x05125dad, 0x1642ae59, 0xe4292d5a,
500xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a,
510x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595,
520x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48,
530x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957,
540xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687,
550x0c38d26c, 0xfe53516f, 0xed03a29b, 0x1f682198,
560x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927,
570x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38,
580xdbfc821c, 0x2997011f, 0x3ac7f2eb, 0xc8ac71e8,
590x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7,
600x61c69362, 0x93ad1061, 0x80fde395, 0x72966096,
610xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789,
620xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859,
630x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46,
640x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9,
650xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6,
660xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36,
670x3cdb9bdd, 0xceb018de, 0xdde0eb2a, 0x2f8b6829,
680x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c,
690x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93,
700x082f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043,
710xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c,
720x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3,
730x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc,
740x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c,
750xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033,
760xa24bb5a6, 0x502036a5, 0x4370c551, 0xb11b4652,
770x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d,
780x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d,
790xef087a76, 0x1d63f975, 0x0e330a81, 0xfc588982,
800xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d,
810x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622,
820x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2,
830xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed,
840xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530,
850x0417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f,
860x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff,
870x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0,
880xd3d3e1ab, 0x21b862a8, 0x32e8915c, 0xc083125f,
890x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540,
900x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90,
910x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f,
920xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee,
930x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1,
940x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321,
950xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e,
960xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81,
970x34f4f86a, 0xc69f7b69, 0xd5cf889d, 0x27a40b9e,
980x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e,
990xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351,
100};
101static unsigned crc32c_table2[256] = {
1020x00000000, 0x13a29877, 0x274530ee, 0x34e7a899,
1030x4e8a61dc, 0x5d28f9ab, 0x69cf5132, 0x7a6dc945,
1040x9d14c3b8, 0x8eb65bcf, 0xba51f356, 0xa9f36b21,
1050xd39ea264, 0xc03c3a13, 0xf4db928a, 0xe7790afd,
1060x3fc5f181, 0x2c6769f6, 0x1880c16f, 0x0b225918,
1070x714f905d, 0x62ed082a, 0x560aa0b3, 0x45a838c4,
1080xa2d13239, 0xb173aa4e, 0x859402d7, 0x96369aa0,
1090xec5b53e5, 0xfff9cb92, 0xcb1e630b, 0xd8bcfb7c,
1100x7f8be302, 0x6c297b75, 0x58ced3ec, 0x4b6c4b9b,
1110x310182de, 0x22a31aa9, 0x1644b230, 0x05e62a47,
1120xe29f20ba, 0xf13db8cd, 0xc5da1054, 0xd6788823,
1130xac154166, 0xbfb7d911, 0x8b507188, 0x98f2e9ff,
1140x404e1283, 0x53ec8af4, 0x670b226d, 0x74a9ba1a,
1150x0ec4735f, 0x1d66eb28, 0x298143b1, 0x3a23dbc6,
1160xdd5ad13b, 0xcef8494c, 0xfa1fe1d5, 0xe9bd79a2,
1170x93d0b0e7, 0x80722890, 0xb4958009, 0xa737187e,
1180xff17c604, 0xecb55e73, 0xd852f6ea, 0xcbf06e9d,
1190xb19da7d8, 0xa23f3faf, 0x96d89736, 0x857a0f41,
1200x620305bc, 0x71a19dcb, 0x45463552, 0x56e4ad25,
1210x2c896460, 0x3f2bfc17, 0x0bcc548e, 0x186eccf9,
1220xc0d23785, 0xd370aff2, 0xe797076b, 0xf4359f1c,
1230x8e585659, 0x9dface2e, 0xa91d66b7, 0xbabffec0,
1240x5dc6f43d, 0x4e646c4a, 0x7a83c4d3, 0x69215ca4,
1250x134c95e1, 0x00ee0d96, 0x3409a50f, 0x27ab3d78,
1260x809c2506, 0x933ebd71, 0xa7d915e8, 0xb47b8d9f,
1270xce1644da, 0xddb4dcad, 0xe9537434, 0xfaf1ec43,
1280x1d88e6be, 0x0e2a7ec9, 0x3acdd650, 0x296f4e27,
1290x53028762, 0x40a01f15, 0x7447b78c, 0x67e52ffb,
1300xbf59d487, 0xacfb4cf0, 0x981ce469, 0x8bbe7c1e,
1310xf1d3b55b, 0xe2712d2c, 0xd69685b5, 0xc5341dc2,
1320x224d173f, 0x31ef8f48, 0x050827d1, 0x16aabfa6,
1330x6cc776e3, 0x7f65ee94, 0x4b82460d, 0x5820de7a,
1340xfbc3faf9, 0xe861628e, 0xdc86ca17, 0xcf245260,
1350xb5499b25, 0xa6eb0352, 0x920cabcb, 0x81ae33bc,
1360x66d73941, 0x7575a136, 0x419209af, 0x523091d8,
1370x285d589d, 0x3bffc0ea, 0x0f186873, 0x1cbaf004,
1380xc4060b78, 0xd7a4930f, 0xe3433b96, 0xf0e1a3e1,
1390x8a8c6aa4, 0x992ef2d3, 0xadc95a4a, 0xbe6bc23d,
1400x5912c8c0, 0x4ab050b7, 0x7e57f82e, 0x6df56059,
1410x1798a91c, 0x043a316b, 0x30dd99f2, 0x237f0185,
1420x844819fb, 0x97ea818c, 0xa30d2915, 0xb0afb162,
1430xcac27827, 0xd960e050, 0xed8748c9, 0xfe25d0be,
1440x195cda43, 0x0afe4234, 0x3e19eaad, 0x2dbb72da,
1450x57d6bb9f, 0x447423e8, 0x70938b71, 0x63311306,
1460xbb8de87a, 0xa82f700d, 0x9cc8d894, 0x8f6a40e3,
1470xf50789a6, 0xe6a511d1, 0xd242b948, 0xc1e0213f,
1480x26992bc2, 0x353bb3b5, 0x01dc1b2c, 0x127e835b,
1490x68134a1e, 0x7bb1d269, 0x4f567af0, 0x5cf4e287,
1500x04d43cfd, 0x1776a48a, 0x23910c13, 0x30339464,
1510x4a5e5d21, 0x59fcc556, 0x6d1b6dcf, 0x7eb9f5b8,
1520x99c0ff45, 0x8a626732, 0xbe85cfab, 0xad2757dc,
1530xd74a9e99, 0xc4e806ee, 0xf00fae77, 0xe3ad3600,
1540x3b11cd7c, 0x28b3550b, 0x1c54fd92, 0x0ff665e5,
1550x759baca0, 0x663934d7, 0x52de9c4e, 0x417c0439,
1560xa6050ec4, 0xb5a796b3, 0x81403e2a, 0x92e2a65d,
1570xe88f6f18, 0xfb2df76f, 0xcfca5ff6, 0xdc68c781,
1580x7b5fdfff, 0x68fd4788, 0x5c1aef11, 0x4fb87766,
1590x35d5be23, 0x26772654, 0x12908ecd, 0x013216ba,
1600xe64b1c47, 0xf5e98430, 0xc10e2ca9, 0xd2acb4de,
1610xa8c17d9b, 0xbb63e5ec, 0x8f844d75, 0x9c26d502,
1620x449a2e7e, 0x5738b609, 0x63df1e90, 0x707d86e7,
1630x0a104fa2, 0x19b2d7d5, 0x2d557f4c, 0x3ef7e73b,
1640xd98eedc6, 0xca2c75b1, 0xfecbdd28, 0xed69455f,
1650x97048c1a, 0x84a6146d, 0xb041bcf4, 0xa3e32483,
166};
167static unsigned crc32c_table1[256] = {
1680x00000000, 0xa541927e, 0x4f6f520d, 0xea2ec073,
1690x9edea41a, 0x3b9f3664, 0xd1b1f617, 0x74f06469,
1700x38513ec5, 0x9d10acbb, 0x773e6cc8, 0xd27ffeb6,
1710xa68f9adf, 0x03ce08a1, 0xe9e0c8d2, 0x4ca15aac,
1720x70a27d8a, 0xd5e3eff4, 0x3fcd2f87, 0x9a8cbdf9,
1730xee7cd990, 0x4b3d4bee, 0xa1138b9d, 0x045219e3,
1740x48f3434f, 0xedb2d131, 0x079c1142, 0xa2dd833c,
1750xd62de755, 0x736c752b, 0x9942b558, 0x3c032726,
1760xe144fb14, 0x4405696a, 0xae2ba919, 0x0b6a3b67,
1770x7f9a5f0e, 0xdadbcd70, 0x30f50d03, 0x95b49f7d,
1780xd915c5d1, 0x7c5457af, 0x967a97dc, 0x333b05a2,
1790x47cb61cb, 0xe28af3b5, 0x08a433c6, 0xade5a1b8,
1800x91e6869e, 0x34a714e0, 0xde89d493, 0x7bc846ed,
1810x0f382284, 0xaa79b0fa, 0x40577089, 0xe516e2f7,
1820xa9b7b85b, 0x0cf62a25, 0xe6d8ea56, 0x43997828,
1830x37691c41, 0x92288e3f, 0x78064e4c, 0xdd47dc32,
1840xc76580d9, 0x622412a7, 0x880ad2d4, 0x2d4b40aa,
1850x59bb24c3, 0xfcfab6bd, 0x16d476ce, 0xb395e4b0,
1860xff34be1c, 0x5a752c62, 0xb05bec11, 0x151a7e6f,
1870x61ea1a06, 0xc4ab8878, 0x2e85480b, 0x8bc4da75,
1880xb7c7fd53, 0x12866f2d, 0xf8a8af5e, 0x5de93d20,
1890x29195949, 0x8c58cb37, 0x66760b44, 0xc337993a,
1900x8f96c396, 0x2ad751e8, 0xc0f9919b, 0x65b803e5,
1910x1148678c, 0xb409f5f2, 0x5e273581, 0xfb66a7ff,
1920x26217bcd, 0x8360e9b3, 0x694e29c0, 0xcc0fbbbe,
1930xb8ffdfd7, 0x1dbe4da9, 0xf7908dda, 0x52d11fa4,
1940x1e704508, 0xbb31d776, 0x511f1705, 0xf45e857b,
1950x80aee112, 0x25ef736c, 0xcfc1b31f, 0x6a802161,
1960x56830647, 0xf3c29439, 0x19ec544a, 0xbcadc634,
1970xc85da25d, 0x6d1c3023, 0x8732f050, 0x2273622e,
1980x6ed23882, 0xcb93aafc, 0x21bd6a8f, 0x84fcf8f1,
1990xf00c9c98, 0x554d0ee6, 0xbf63ce95, 0x1a225ceb,
2000x8b277743, 0x2e66e53d, 0xc448254e, 0x6109b730,
2010x15f9d359, 0xb0b84127, 0x5a968154, 0xffd7132a,
2020xb3764986, 0x1637dbf8, 0xfc191b8b, 0x595889f5,
2030x2da8ed9c, 0x88e97fe2, 0x62c7bf91, 0xc7862def,
2040xfb850ac9, 0x5ec498b7, 0xb4ea58c4, 0x11abcaba,
2050x655baed3, 0xc01a3cad, 0x2a34fcde, 0x8f756ea0,
2060xc3d4340c, 0x6695a672, 0x8cbb6601, 0x29faf47f,
2070x5d0a9016, 0xf84b0268, 0x1265c21b, 0xb7245065,
2080x6a638c57, 0xcf221e29, 0x250cde5a, 0x804d4c24,
2090xf4bd284d, 0x51fcba33, 0xbbd27a40, 0x1e93e83e,
2100x5232b292, 0xf77320ec, 0x1d5de09f, 0xb81c72e1,
2110xccec1688, 0x69ad84f6, 0x83834485, 0x26c2d6fb,
2120x1ac1f1dd, 0xbf8063a3, 0x55aea3d0, 0xf0ef31ae,
2130x841f55c7, 0x215ec7b9, 0xcb7007ca, 0x6e3195b4,
2140x2290cf18, 0x87d15d66, 0x6dff9d15, 0xc8be0f6b,
2150xbc4e6b02, 0x190ff97c, 0xf321390f, 0x5660ab71,
2160x4c42f79a, 0xe90365e4, 0x032da597, 0xa66c37e9,
2170xd29c5380, 0x77ddc1fe, 0x9df3018d, 0x38b293f3,
2180x7413c95f, 0xd1525b21, 0x3b7c9b52, 0x9e3d092c,
2190xeacd6d45, 0x4f8cff3b, 0xa5a23f48, 0x00e3ad36,
2200x3ce08a10, 0x99a1186e, 0x738fd81d, 0xd6ce4a63,
2210xa23e2e0a, 0x077fbc74, 0xed517c07, 0x4810ee79,
2220x04b1b4d5, 0xa1f026ab, 0x4bdee6d8, 0xee9f74a6,
2230x9a6f10cf, 0x3f2e82b1, 0xd50042c2, 0x7041d0bc,
2240xad060c8e, 0x08479ef0, 0xe2695e83, 0x4728ccfd,
2250x33d8a894, 0x96993aea, 0x7cb7fa99, 0xd9f668e7,
2260x9557324b, 0x3016a035, 0xda386046, 0x7f79f238,
2270x0b899651, 0xaec8042f, 0x44e6c45c, 0xe1a75622,
2280xdda47104, 0x78e5e37a, 0x92cb2309, 0x378ab177,
2290x437ad51e, 0xe63b4760, 0x0c158713, 0xa954156d,
2300xe5f54fc1, 0x40b4ddbf, 0xaa9a1dcc, 0x0fdb8fb2,
2310x7b2bebdb, 0xde6a79a5, 0x3444b9d6, 0x91052ba8,
232};
233static unsigned crc32c_table0[256] = {
2340x00000000, 0xdd45aab8, 0xbf672381, 0x62228939,
2350x7b2231f3, 0xa6679b4b, 0xc4451272, 0x1900b8ca,
2360xf64463e6, 0x2b01c95e, 0x49234067, 0x9466eadf,
2370x8d665215, 0x5023f8ad, 0x32017194, 0xef44db2c,
2380xe964b13d, 0x34211b85, 0x560392bc, 0x8b463804,
2390x924680ce, 0x4f032a76, 0x2d21a34f, 0xf06409f7,
2400x1f20d2db, 0xc2657863, 0xa047f15a, 0x7d025be2,
2410x6402e328, 0xb9474990, 0xdb65c0a9, 0x06206a11,
2420xd725148b, 0x0a60be33, 0x6842370a, 0xb5079db2,
2430xac072578, 0x71428fc0, 0x136006f9, 0xce25ac41,
2440x2161776d, 0xfc24ddd5, 0x9e0654ec, 0x4343fe54,
2450x5a43469e, 0x8706ec26, 0xe524651f, 0x3861cfa7,
2460x3e41a5b6, 0xe3040f0e, 0x81268637, 0x5c632c8f,
2470x45639445, 0x98263efd, 0xfa04b7c4, 0x27411d7c,
2480xc805c650, 0x15406ce8, 0x7762e5d1, 0xaa274f69,
2490xb327f7a3, 0x6e625d1b, 0x0c40d422, 0xd1057e9a,
2500xaba65fe7, 0x76e3f55f, 0x14c17c66, 0xc984d6de,
2510xd0846e14, 0x0dc1c4ac, 0x6fe34d95, 0xb2a6e72d,
2520x5de23c01, 0x80a796b9, 0xe2851f80, 0x3fc0b538,
2530x26c00df2, 0xfb85a74a, 0x99a72e73, 0x44e284cb,
2540x42c2eeda, 0x9f874462, 0xfda5cd5b, 0x20e067e3,
2550x39e0df29, 0xe4a57591, 0x8687fca8, 0x5bc25610,
2560xb4868d3c, 0x69c32784, 0x0be1aebd, 0xd6a40405,
2570xcfa4bccf, 0x12e11677, 0x70c39f4e, 0xad8635f6,
2580x7c834b6c, 0xa1c6e1d4, 0xc3e468ed, 0x1ea1c255,
2590x07a17a9f, 0xdae4d027, 0xb8c6591e, 0x6583f3a6,
2600x8ac7288a, 0x57828232, 0x35a00b0b, 0xe8e5a1b3,
2610xf1e51979, 0x2ca0b3c1, 0x4e823af8, 0x93c79040,
2620x95e7fa51, 0x48a250e9, 0x2a80d9d0, 0xf7c57368,
2630xeec5cba2, 0x3380611a, 0x51a2e823, 0x8ce7429b,
2640x63a399b7, 0xbee6330f, 0xdcc4ba36, 0x0181108e,
2650x1881a844, 0xc5c402fc, 0xa7e68bc5, 0x7aa3217d,
2660x52a0c93f, 0x8fe56387, 0xedc7eabe, 0x30824006,
2670x2982f8cc, 0xf4c75274, 0x96e5db4d, 0x4ba071f5,
2680xa4e4aad9, 0x79a10061, 0x1b838958, 0xc6c623e0,
2690xdfc69b2a, 0x02833192, 0x60a1b8ab, 0xbde41213,
2700xbbc47802, 0x6681d2ba, 0x04a35b83, 0xd9e6f13b,
2710xc0e649f1, 0x1da3e349, 0x7f816a70, 0xa2c4c0c8,
2720x4d801be4, 0x90c5b15c, 0xf2e73865, 0x2fa292dd,
2730x36a22a17, 0xebe780af, 0x89c50996, 0x5480a32e,
2740x8585ddb4, 0x58c0770c, 0x3ae2fe35, 0xe7a7548d,
2750xfea7ec47, 0x23e246ff, 0x41c0cfc6, 0x9c85657e,
2760x73c1be52, 0xae8414ea, 0xcca69dd3, 0x11e3376b,
2770x08e38fa1, 0xd5a62519, 0xb784ac20, 0x6ac10698,
2780x6ce16c89, 0xb1a4c631, 0xd3864f08, 0x0ec3e5b0,
2790x17c35d7a, 0xca86f7c2, 0xa8a47efb, 0x75e1d443,
2800x9aa50f6f, 0x47e0a5d7, 0x25c22cee, 0xf8878656,
2810xe1873e9c, 0x3cc29424, 0x5ee01d1d, 0x83a5b7a5,
2820xf90696d8, 0x24433c60, 0x4661b559, 0x9b241fe1,
2830x8224a72b, 0x5f610d93, 0x3d4384aa, 0xe0062e12,
2840x0f42f53e, 0xd2075f86, 0xb025d6bf, 0x6d607c07,
2850x7460c4cd, 0xa9256e75, 0xcb07e74c, 0x16424df4,
2860x106227e5, 0xcd278d5d, 0xaf050464, 0x7240aedc,
2870x6b401616, 0xb605bcae, 0xd4273597, 0x09629f2f,
2880xe6264403, 0x3b63eebb, 0x59416782, 0x8404cd3a,
2890x9d0475f0, 0x4041df48, 0x22635671, 0xff26fcc9,
2900x2e238253, 0xf36628eb, 0x9144a1d2, 0x4c010b6a,
2910x5501b3a0, 0x88441918, 0xea669021, 0x37233a99,
2920xd867e1b5, 0x05224b0d, 0x6700c234, 0xba45688c,
2930xa345d046, 0x7e007afe, 0x1c22f3c7, 0xc167597f,
2940xc747336e, 0x1a0299d6, 0x782010ef, 0xa565ba57,
2950xbc65029d, 0x6120a825, 0x0302211c, 0xde478ba4,
2960x31035088, 0xec46fa30, 0x8e647309, 0x5321d9b1,
2970x4a21617b, 0x9764cbc3, 0xf54642fa, 0x2803e842,
298};
299
300#define CRC32C_REFLECTED_X1023 0x7417153fll
301#define CRC32C_REFLECTED_X2047 0x1426a815ll
302#define CRC32C_REFLECTED_X4095 0xe986c148ll
303#define CRC32C_REFLECTED_X8191 0xcdc220ddll
304#define CRC32C_REFLECTED_X16383 0x1acaec54ll
305
306#ifdef __LP64__
307static unsigned crc32c_partial_sse42 (const void *data, long len, unsigned crc) {
308 const char *p = data;
309 unsigned long long c = crc;
310 while ((((uintptr_t) p) & 7) && (len > 0)) {
311 asm volatile (
312 "crc32b (%2), %1\n\t"
313 : "=r" (c)
314 : "0" (c), "r" (p)
315 );
316 p++;
317 len--;
318 }
319 while (len >= 8) {
320 asm volatile (
321 "crc32q (%2), %1\n\t"
322 : "=r" (c)
323 : "0" (c), "r" (p)
324 );
325 p += 8;
326 len -= 8;
327 }
328 while (len > 0) {
329 asm volatile (
330 "crc32b (%2), %1\n\t"
331 : "=r" (c)
332 : "0" (c), "r" (p)
333 );
334 p++;
335 len--;
336 }
337 return c;
338}
339
340static unsigned crc32c_partial_sse42_clmul (const void *data, long len, unsigned crc) {
341 const char *p = data;
342 if (unlikely ((((uintptr_t) p) & 1)) && (len > 0)) {
343 asm volatile (
344 "crc32b (%2), %1\n\t"
345 : "=r" (crc)
346 : "0" (crc), "r" (p)
347 );
348 p++;
349 len--;
350 }
351
352 if (unlikely ((((uintptr_t) p) & 2)) && (len >= 2)) {
353 asm volatile (
354 "crc32w (%2), %1\n\t"
355 : "=r" (crc)
356 : "0" (crc), "r" (p)
357 );
358 p += 2;
359 len -= 2;
360 }
361
362 if ((((uintptr_t) p) & 4) && (len >= 4)) {
363 asm volatile (
364 "crc32l (%2), %1\n\t"
365 : "=r" (crc)
366 : "0" (crc), "r" (p)
367 );
368 p += 4;
369 len -= 4;
370 }
371
372 if (unlikely (((uintptr_t) p) & 7)) {
373 while (len > 0) {
374 asm volatile (
375 "crc32b (%2), %1\n\t"
376 : "=r" (crc)
377 : "0" (crc), "r" (p)
378 );
379 p++;
380 len--;
381 }
382 return crc;
383 }
384
385 unsigned long long c = crc;
386
387 while (len >= 3 * 0x400) {
388 unsigned long long c1 = 0, c2 = 0;
389 const char *q = p + 0x400;
390 do {
391 asm volatile(
392 "crc32q (%3), %0\n\t"
393 "crc32q 0x400(%3), %1\n\t"
394 "crc32q 0x800(%3), %2\n\t"
395 "crc32q 8(%3), %0\n\t"
396 "crc32q 0x408(%3), %1\n\t"
397 "crc32q 0x808(%3), %2\n\t"
398 : "=r"(c), "=r"(c1), "=r"(c2)
399 : "r"(p), "0"(c), "1"(c1), "2"(c2));
400 p += 16;
401 } while (p < q);
402 static const v2di K = { CRC32C_REFLECTED_X16383, CRC32C_REFLECTED_X8191 };
403 v2di D, E;
404 asm volatile ("movq %1, %0\n\t" : "=x" (D) : "g" (c));
405 asm volatile ("movq %1, %0\n\t" : "=x" (E) : "g" (c1));
406 v2di F = __builtin_ia32_pclmulqdq128 (D, K, 0x00) ^ __builtin_ia32_pclmulqdq128 (E, K, 0x10);
407 asm volatile ("movq %1, %0\n\t" : "=g" (c1) : "x"(F));
408 unsigned int r;
409 asm volatile ("crc32l %1, %0\n\t" : "=r" (r) : "r"((int) c1), "0"(0));
410 p += 0x800;
411 len -= 3 * 0x400;
412 c = r ^ (c1 >> 32) ^ c2;
413 }
414 while (len >= 0x180) {
415 unsigned long long c1 = 0, c2 = 0;
416 asm volatile(
417 "crc32q (%3), %0\n\t"
418 "crc32q 0x80(%3), %1\n\t"
419 "crc32q 0x100(%3), %2\n\t"
420 "crc32q 0x8(%3), %0\n\t"
421 "crc32q 0x88(%3), %1\n\t"
422 "crc32q 0x108(%3), %2\n\t"
423 "crc32q 0x10(%3), %0\n\t"
424 "crc32q 0x90(%3), %1\n\t"
425 "crc32q 0x110(%3), %2\n\t"
426 "crc32q 0x18(%3), %0\n\t"
427 "crc32q 0x98(%3), %1\n\t"
428 "crc32q 0x118(%3), %2\n\t"
429 "crc32q 0x20(%3), %0\n\t"
430 "crc32q 0xa0(%3), %1\n\t"
431 "crc32q 0x120(%3), %2\n\t"
432 "crc32q 0x28(%3), %0\n\t"
433 "crc32q 0xa8(%3), %1\n\t"
434 "crc32q 0x128(%3), %2\n\t"
435 "crc32q 0x30(%3), %0\n\t"
436 "crc32q 0xb0(%3), %1\n\t"
437 "crc32q 0x130(%3), %2\n\t"
438 "crc32q 0x38(%3), %0\n\t"
439 "crc32q 0xb8(%3), %1\n\t"
440 "crc32q 0x138(%3), %2\n\t"
441 "crc32q 0x40(%3), %0\n\t"
442 "crc32q 0xc0(%3), %1\n\t"
443 "crc32q 0x140(%3), %2\n\t"
444 "crc32q 0x48(%3), %0\n\t"
445 "crc32q 0xc8(%3), %1\n\t"
446 "crc32q 0x148(%3), %2\n\t"
447 "crc32q 0x50(%3), %0\n\t"
448 "crc32q 0xd0(%3), %1\n\t"
449 "crc32q 0x150(%3), %2\n\t"
450 "crc32q 0x58(%3), %0\n\t"
451 "crc32q 0xd8(%3), %1\n\t"
452 "crc32q 0x158(%3), %2\n\t"
453 "crc32q 0x60(%3), %0\n\t"
454 "crc32q 0xe0(%3), %1\n\t"
455 "crc32q 0x160(%3), %2\n\t"
456 "crc32q 0x68(%3), %0\n\t"
457 "crc32q 0xe8(%3), %1\n\t"
458 "crc32q 0x168(%3), %2\n\t"
459 "crc32q 0x70(%3), %0\n\t"
460 "crc32q 0xf0(%3), %1\n\t"
461 "crc32q 0x170(%3), %2\n\t"
462 "crc32q 0x78(%3), %0\n\t"
463 "crc32q 0xf8(%3), %1\n\t"
464 "crc32q 0x178(%3), %2\n\t"
465 : "=r"(c), "=r"(c1), "=r"(c2)
466 : "r"(p), "0"(c), "1"(c1), "2"(c2));
467 static const v2di K = { CRC32C_REFLECTED_X2047, CRC32C_REFLECTED_X1023 };
468 v2di D, E;
469 asm volatile ("movq %1, %0\n\t" : "=x" (D) : "g" (c));
470 asm volatile ("movq %1, %0\n\t" : "=x" (E) : "g" (c1));
471 v2di F = __builtin_ia32_pclmulqdq128 (D, K, 0x00) ^ __builtin_ia32_pclmulqdq128 (E, K, 0x10);
472 asm volatile ("movq %1, %0\n\t" : "=g" (c1) : "x"(F));
473 unsigned int r;
474 asm volatile ("crc32l %1, %0\n\t" : "=r" (r) : "r"((int) c1), "0"(0));
475 p += 0x180;
476 len -= 0x180;
477 c = r ^ (c1 >> 32) ^ c2;
478 }
479 while (len >= 32) {
480 asm volatile (
481 "crc32q (%2), %1\n\t"
482 "crc32q 8(%2), %1\n\t"
483 "crc32q 0x10(%2), %1\n\t"
484 "crc32q 0x18(%2), %1\n\t"
485 : "=r" (c)
486 : "0" (c), "r" (p)
487 );
488 p += 32;
489 len -= 32;
490 }
491 while (len >= 8) {
492 asm volatile (
493 "crc32q (%2), %1\n\t"
494 : "=r" (c)
495 : "0" (c), "r" (p)
496 );
497 p += 8;
498 len -= 8;
499 }
500 crc = c;
501 if (len & 4) {
502 asm volatile (
503 "crc32l (%2), %1\n\t"
504 : "=r" (crc)
505 : "0" (crc), "r" (p)
506 );
507 p += 4;
508 }
509 if (likely (!(len & 3))) {
510 return crc;
511 }
512 if (len & 2) {
513 asm volatile (
514 "crc32w (%2), %1\n\t"
515 : "=r" (crc)
516 : "0" (crc), "r" (p)
517 );
518 p += 2;
519 }
520 if (len & 1) {
521 asm volatile (
522 "crc32b (%2), %1\n\t"
523 : "=r" (crc)
524 : "0" (crc), "r" (p)
525 );
526 }
527 return crc;
528}
529
530#else
531static unsigned crc32c_partial_sse42 (const void *data, long len, unsigned crc) {
532 const char *p = data;
533 while ((((uintptr_t) p) & 3) && (len > 0)) {
534 asm volatile (
535 "crc32b (%2), %1\n\t"
536 : "=r" (crc)
537 : "0" (crc), "r" (p)
538 );
539 p++;
540 len--;
541 }
542 while (len >= 4) {
543 asm volatile (
544 "crc32l (%2), %1\n\t"
545 : "=r" (crc)
546 : "0" (crc), "r" (p)
547 );
548 p += 4;
549 len -= 4;
550 }
551 while (len > 0) {
552 asm volatile (
553 "crc32b (%2), %1\n\t"
554 : "=r" (crc)
555 : "0" (crc), "r" (p)
556 );
557 p++;
558 len--;
559 }
560 return crc;
561}
562#endif
563
564unsigned crc32c_partial_four_tables (const void *data, long len, unsigned crc) {
565 const int *p = (const int *) data;
566 int x;
567#define DO_ONE(v) crc ^= v; crc = crc32c_table0[crc & 0xff] ^ crc32c_table1[(crc & 0xff00) >> 8] ^ crc32c_table2[(crc & 0xff0000) >> 16] ^ crc32c_table[crc >> 24];
568#define DO_FOUR(p) DO_ONE((p)[0]); DO_ONE((p)[1]); DO_ONE((p)[2]); DO_ONE((p)[3]);
569
570 for (x = (len >> 5); x > 0; x--) {
571 DO_FOUR (p);
572 DO_FOUR (p + 4);
573 p += 8;
574 }
575 if (len & 16) {
576 DO_FOUR (p);
577 p += 4;
578 }
579 if (len & 8) {
580 DO_ONE (p[0]);
581 DO_ONE (p[1]);
582 p += 2;
583 }
584 if (len & 4) {
585 DO_ONE (*p++);
586 }
587#undef DO_ONE
588#undef DO_FOUR
589 const char *q = (const char *) p;
590 if (len & 2) {
591 crc = crc32c_table[(crc ^ q[0]) & 0xff] ^ (crc >> 8);
592 crc = crc32c_table[(crc ^ q[1]) & 0xff] ^ (crc >> 8);
593 q += 2;
594 }
595 if (len & 1) {
596 crc = crc32c_table[(crc ^ *q++) & 0xff] ^ (crc >> 8);
597 }
598 return crc;
599}
600
601#define CRC32C_REFLECTED_POLY 0x82F63B78U
602
603static unsigned crc32c_combine_generic (unsigned crc1, unsigned crc2, int64_t len2) {
604 #define N (32*67)
605 static unsigned int crc32c_powers[N];
606 /* degenerate case (also disallow negative lengths) */
607 if (len2 <= 0) {
608 return crc1;
609 }
610 if (!crc32c_powers[N-1]) {
611 gf32_compute_powers_generic (crc32c_powers, N, CRC32C_REFLECTED_POLY);
612 assert (crc32c_powers[N-1]);
613 }
614 return gf32_combine_generic (crc32c_powers, crc1, len2) ^ crc2;
615}
616
617static unsigned crc32c_combine_clmul (unsigned crc1, unsigned crc2, int64_t len2) {
618 static unsigned int crc32c_powers[252] __attribute__ ((aligned(16)));
619 if (len2 <= 0) {
620 return crc1;
621 }
622 if (!crc32c_powers[251]) {
623 gf32_compute_powers_clmul (crc32c_powers, CRC32C_REFLECTED_POLY);
624 assert (crc32c_powers[7 * 4 + 3] == (int) CRC32C_REFLECTED_X1023);
625 assert (crc32c_powers[8 * 4 + 3] == (int) CRC32C_REFLECTED_X2047);
626 assert (crc32c_powers[9 * 4 + 3] == (int) CRC32C_REFLECTED_X4095);
627 assert (crc32c_powers[10 * 4 + 3] == (int) CRC32C_REFLECTED_X8191);
628 assert (crc32c_powers[11 * 4 + 3] == (int) CRC32C_REFLECTED_X16383);
629 assert (crc32c_powers[251]);
630 }
631
632 uint64_t T = gf32_combine_clmul (crc32c_powers, crc1, len2);
633
634 unsigned crc = 0;
635 asm volatile (
636 "crc32l %2, %1\n\t"
637 : "=r" (crc)
638 : "0" (crc), "r" ( (unsigned) T)
639 );
640 return crc ^ ((unsigned) (T >> 32)) ^ crc2;
641}
642
643static void crc32c_init (void) __attribute__ ((constructor));
644void crc32c_init (void) {
645 kdb_cpuid_t *p = kdb_cpuid ();
646 compute_crc32c_combine = &crc32c_combine_generic;
647 if (p->ecx & (1 << 20)) {
648 crc32c_partial = crc32c_partial_sse42;
649#ifdef __LP64__
650 if (p->ecx & 2) {
651 crc32c_partial = crc32c_partial_sse42_clmul;
652 compute_crc32c_combine = &crc32c_combine_clmul;
653 }
654#endif
655 } else {
656 crc32c_partial = &crc32c_partial_four_tables;
657 }
658}
659
660crc32_partial_func_t crc32c_partial;
661crc32_combine_func_t compute_crc32c_combine;
662
663