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277e777f JG |
1 | /* |
2 | * This code is from freebsd/sys/libkern/crc32.c | |
3 | * | |
4 | * Simplest table-based crc32c. Performance is not important | |
5 | * for checking crcs on superblocks | |
6 | */ | |
7 | ||
8 | /*- | |
9 | * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or | |
10 | * code or tables extracted from it, as desired without restriction. | |
11 | */ | |
12 | ||
2598e25f | 13 | #include <assert.h> |
277e777f JG |
14 | #include "crc32c.h" |
15 | ||
16 | static const uint32_t crc32Table[256] = { | |
17 | 0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L, | |
18 | 0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL, | |
19 | 0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL, | |
20 | 0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L, | |
21 | 0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL, | |
22 | 0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L, | |
23 | 0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L, | |
24 | 0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL, | |
25 | 0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL, | |
26 | 0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L, | |
27 | 0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L, | |
28 | 0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL, | |
29 | 0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L, | |
30 | 0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL, | |
31 | 0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL, | |
32 | 0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L, | |
33 | 0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L, | |
34 | 0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L, | |
35 | 0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L, | |
36 | 0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L, | |
37 | 0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L, | |
38 | 0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L, | |
39 | 0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L, | |
40 | 0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L, | |
41 | 0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L, | |
42 | 0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L, | |
43 | 0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L, | |
44 | 0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L, | |
45 | 0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L, | |
46 | 0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L, | |
47 | 0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L, | |
48 | 0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L, | |
49 | 0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL, | |
50 | 0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L, | |
51 | 0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L, | |
52 | 0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL, | |
53 | 0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L, | |
54 | 0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL, | |
55 | 0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL, | |
56 | 0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L, | |
57 | 0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L, | |
58 | 0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL, | |
59 | 0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL, | |
60 | 0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L, | |
61 | 0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL, | |
62 | 0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L, | |
63 | 0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L, | |
64 | 0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL, | |
65 | 0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L, | |
66 | 0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL, | |
67 | 0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL, | |
68 | 0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L, | |
69 | 0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL, | |
70 | 0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L, | |
71 | 0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L, | |
72 | 0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL, | |
73 | 0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL, | |
74 | 0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L, | |
75 | 0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L, | |
76 | 0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL, | |
77 | 0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L, | |
78 | 0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL, | |
79 | 0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL, | |
80 | 0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L | |
81 | }; | |
82 | ||
83 | /* | |
84 | *This was singletable_crc32c() in bsd | |
85 | * | |
86 | * If you will not be passing crc back into this function to process more bytes, | |
87 | * the answer is: | |
88 | * | |
89 | * crc = crc32c(~0L, buf, size); | |
90 | * [ crc = crc32c(crc, buf, size); ] | |
91 | * crc ^= ~0L | |
92 | * | |
93 | */ | |
94 | uint32_t | |
95 | crc32c(uint32_t crc, const void *buf, size_t size) | |
96 | { | |
97 | const uint8_t *p = buf; | |
98 | ||
99 | while (size--) | |
100 | crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8); | |
101 | ||
102 | return crc; | |
103 | } | |
2598e25f JL |
104 | |
105 | uint32_t | |
106 | ul_crc32c_exclude_offset(uint32_t crc, const unsigned char *buf, size_t size, | |
107 | size_t exclude_off, size_t exclude_len) | |
108 | { | |
109 | size_t i; | |
5f03a197 KZ |
110 | |
111 | assert((exclude_off + exclude_len) <= size); | |
2598e25f JL |
112 | |
113 | crc = crc32c(crc, buf, exclude_off); | |
114 | for (i = 0; i < exclude_len; i++) { | |
115 | uint8_t zero = 0; | |
116 | crc = crc32c(crc, &zero, 1); | |
117 | } | |
118 | crc = crc32c(crc, &buf[exclude_off + exclude_len], | |
119 | size - (exclude_off + exclude_len)); | |
120 | return crc; | |
121 | } |