1 /* Copyright (c) Mark Harmstone 2016-17 2 * 3 * This file is part of WinBtrfs. 4 * 5 * WinBtrfs is free software: you can redistribute it and/or modify 6 * it under the terms of the GNU Lesser General Public Licence as published by 7 * the Free Software Foundation, either version 3 of the Licence, or 8 * (at your option) any later version. 9 * 10 * WinBtrfs is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU Lesser General Public Licence for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public Licence 16 * along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include <windef.h> 19 #ifndef __REACTOS__ 20 #include <smmintrin.h> 21 #endif /* __REACTOS__ */ 22 #include <stdint.h> 23 #include <stdbool.h> 24 25 #ifndef __REACTOS__ 26 extern bool have_sse42; 27 #endif /* __REACTOS__ */ 28 29 static const uint32_t crctable[] = { 30 0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, 0xc79a971f, 0x35f1141c, 0x26a1e7e8, 0xd4ca64eb, 31 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b, 0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24, 32 0x105ec76f, 0xe235446c, 0xf165b798, 0x030e349b, 0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384, 33 0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54, 0x5d1d08bf, 0xaf768bbc, 0xbc267848, 0x4e4dfb4b, 34 0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a, 0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35, 35 0xaa64d611, 0x580f5512, 0x4b5fa6e6, 0xb93425e5, 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa, 36 0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45, 0xf779deae, 0x05125dad, 0x1642ae59, 0xe4292d5a, 37 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a, 0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595, 38 0x417b1dbc, 0xb3109ebf, 0xa0406d4b, 0x522bee48, 0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957, 39 0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, 0x0c38d26c, 0xfe53516f, 0xed03a29b, 0x1f682198, 40 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927, 0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, 41 0xdbfc821c, 0x2997011f, 0x3ac7f2eb, 0xc8ac71e8, 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7, 42 0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096, 0xa65c047d, 0x5437877e, 0x4767748a, 0xb50cf789, 43 0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859, 0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46, 44 0x7198540d, 0x83f3d70e, 0x90a324fa, 0x62c8a7f9, 0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6, 45 0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36, 0x3cdb9bdd, 0xceb018de, 0xdde0eb2a, 0x2f8b6829, 46 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c, 0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93, 47 0x082f63b7, 0xfa44e0b4, 0xe9141340, 0x1b7f9043, 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c, 48 0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3, 0x55326b08, 0xa759e80b, 0xb4091bff, 0x466298fc, 49 0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c, 0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, 50 0xa24bb5a6, 0x502036a5, 0x4370c551, 0xb11b4652, 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d, 51 0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, 0xef087a76, 0x1d63f975, 0x0e330a81, 0xfc588982, 52 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d, 0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622, 53 0x38cc2a06, 0xcaa7a905, 0xd9f75af1, 0x2b9cd9f2, 0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed, 54 0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530, 0x0417b1db, 0xf67c32d8, 0xe52cc12c, 0x1747422f, 55 0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff, 0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, 56 0xd3d3e1ab, 0x21b862a8, 0x32e8915c, 0xc083125f, 0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540, 57 0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90, 0x9e902e7b, 0x6cfbad78, 0x7fab5e8c, 0x8dc0dd8f, 58 0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee, 0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1, 59 0x69e9f0d5, 0x9b8273d6, 0x88d28022, 0x7ab90321, 0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e, 60 0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81, 0x34f4f86a, 0xc69f7b69, 0xd5cf889d, 0x27a40b9e, 61 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e, 0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351, 62 }; 63 64 #ifndef __REACTOS__ 65 // HW code taken from https://github.com/rurban/smhasher/blob/master/crc32_hw.c 66 #define ALIGN_SIZE 0x08UL 67 #define ALIGN_MASK (ALIGN_SIZE - 1) 68 #define CALC_CRC(op, crc, type, buf, len) \ 69 do { \ 70 for (; (len) >= sizeof (type); (len) -= sizeof(type), buf += sizeof (type)) { \ 71 (crc) = op((crc), *(type *) (buf)); \ 72 } \ 73 } while(0) 74 75 static uint32_t crc32c_hw(const void *input, ULONG len, uint32_t crc) { 76 const char* buf = (const char*)input; 77 78 // Annoyingly, the CRC32 intrinsics don't work properly in modern versions of MSVC - 79 // it compiles _mm_crc32_u8 as if it was _mm_crc32_u32. And because we're apparently 80 // not allowed to use inline asm on amd64, there's no easy way to fix this! 81 82 for (; (len > 0) && ((size_t)buf & ALIGN_MASK); len--, buf++) { 83 #ifdef _MSC_VER 84 crc = crctable[(crc ^ *buf) & 0xff] ^ (crc >> 8); 85 #else 86 crc = _mm_crc32_u8(crc, *buf); 87 #endif 88 } 89 90 #ifdef _AMD64_ 91 #ifdef _MSC_VER 92 #pragma warning(push) 93 #pragma warning(disable:4244) // _mm_crc32_u64 wants to return uint64_t(!) 94 #pragma warning(disable:4242) 95 #endif 96 CALC_CRC(_mm_crc32_u64, crc, uint64_t, buf, len); 97 #ifdef _MSC_VER 98 #pragma warning(pop) 99 #endif 100 #endif 101 CALC_CRC(_mm_crc32_u32, crc, uint32_t, buf, len); 102 103 #ifdef _MSC_VER 104 for (; len > 0; len--, buf++) { 105 crc = crctable[(crc ^ *buf) & 0xff] ^ (crc >> 8); 106 } 107 #else 108 CALC_CRC(_mm_crc32_u16, crc, uint16_t, buf, len); 109 CALC_CRC(_mm_crc32_u8, crc, uint8_t, buf, len); 110 #endif 111 112 return crc; 113 } 114 #endif 115 116 uint32_t calc_crc32c(_In_ uint32_t seed, _In_reads_bytes_(msglen) uint8_t* msg, _In_ ULONG msglen) { 117 uint32_t rem; 118 ULONG i; 119 120 #ifndef __REACTOS__ 121 if (have_sse42) { 122 return crc32c_hw(msg, msglen, seed); 123 } else { 124 #endif 125 rem = seed; 126 127 for (i = 0; i < msglen; i++) { 128 rem = crctable[(rem ^ msg[i]) & 0xff] ^ (rem >> 8); 129 } 130 #ifndef __REACTOS__ 131 } 132 #endif 133 134 return rem; 135 } 136