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959ef981 | 1 | // SPDX-License-Identifier: GPL-2.0 |
7e280e68 DC |
2 | #include <stdio.h> |
3 | #include "crc32defs.h" | |
4 | #include <inttypes.h> | |
5 | ||
6 | #define ENTRIES_PER_LINE 4 | |
7 | ||
8 | #if CRC_LE_BITS > 8 | |
9 | # define LE_TABLE_ROWS (CRC_LE_BITS/8) | |
10 | # define LE_TABLE_SIZE 256 | |
11 | #else | |
12 | # define LE_TABLE_ROWS 1 | |
13 | # define LE_TABLE_SIZE (1 << CRC_LE_BITS) | |
14 | #endif | |
15 | ||
7e280e68 DC |
16 | static uint32_t crc32ctable_le[LE_TABLE_ROWS][256]; |
17 | ||
7e280e68 DC |
18 | /** |
19 | * crc32init_le() - allocate and initialize LE table data | |
20 | * | |
21 | * crc is the crc of the byte i; other entries are filled in based on the | |
22 | * fact that crctable[i^j] = crctable[i] ^ crctable[j]. | |
23 | * | |
24 | */ | |
25 | static void crc32init_le_generic(const uint32_t polynomial, | |
26 | uint32_t (*tab)[256]) | |
27 | { | |
28 | unsigned i, j; | |
29 | uint32_t crc = 1; | |
30 | ||
31 | tab[0][0] = 0; | |
32 | ||
33 | for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) { | |
34 | crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0); | |
35 | for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) | |
36 | tab[0][i + j] = crc ^ tab[0][j]; | |
37 | } | |
38 | for (i = 0; i < LE_TABLE_SIZE; i++) { | |
39 | crc = tab[0][i]; | |
40 | for (j = 1; j < LE_TABLE_ROWS; j++) { | |
41 | crc = tab[0][crc & 0xff] ^ (crc >> 8); | |
42 | tab[j][i] = crc; | |
43 | } | |
44 | } | |
45 | } | |
46 | ||
7e280e68 DC |
47 | static void crc32cinit_le(void) |
48 | { | |
49 | crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le); | |
50 | } | |
51 | ||
7e280e68 DC |
52 | static void output_table(uint32_t (*table)[256], int rows, int len, char *trans) |
53 | { | |
54 | int i, j; | |
55 | ||
56 | for (j = 0 ; j < rows; j++) { | |
57 | printf("{"); | |
58 | for (i = 0; i < len - 1; i++) { | |
59 | if (i % ENTRIES_PER_LINE == 0) | |
60 | printf("\n"); | |
61 | printf("%s(0x%8.8xL), ", trans, table[j][i]); | |
62 | } | |
63 | printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); | |
64 | } | |
65 | } | |
66 | ||
67 | int main(int argc, char** argv) | |
68 | { | |
69 | printf("/* this file is generated - do not edit */\n\n"); | |
70 | ||
7e280e68 DC |
71 | if (CRC_LE_BITS > 1) { |
72 | crc32cinit_le(); | |
73 | printf("static u32 crc32ctable_le[%d][%d] = {", | |
74 | LE_TABLE_ROWS, LE_TABLE_SIZE); | |
75 | output_table(crc32ctable_le, LE_TABLE_ROWS, | |
76 | LE_TABLE_SIZE, "tole"); | |
77 | printf("};\n"); | |
78 | } | |
79 | ||
80 | return 0; | |
81 | } |