5 #define ENTRIES_PER_LINE 4
8 #define LE_TABLE_SIZE (1 << CRC_LE_BITS)
10 #define LE_TABLE_SIZE 256
14 #define BE_TABLE_SIZE (1 << CRC_BE_BITS)
16 #define BE_TABLE_SIZE 256
19 static uint32_t crc32table_le[4][256];
20 static uint32_t crc32table_be[4][256];
23 * crc32init_le() - allocate and initialize LE table data
25 * crc is the crc of the byte i; other entries are filled in based on the
26 * fact that crctable[i^j] = crctable[i] ^ crctable[j].
29 static void crc32init_le(void)
34 crc32table_le[0][0] = 0;
36 for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {
37 crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
38 for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
39 crc32table_le[0][i + j] = crc ^ crc32table_le[0][j];
41 for (i = 0; i < LE_TABLE_SIZE; i++) {
42 crc = crc32table_le[0][i];
43 for (j = 1; j < 4; j++) {
44 crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8);
45 crc32table_le[j][i] = crc;
51 * crc32init_be() - allocate and initialize BE table data
53 static void crc32init_be(void)
56 uint32_t crc = 0x80000000;
58 crc32table_be[0][0] = 0;
60 for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
61 crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
62 for (j = 0; j < i; j++)
63 crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
65 for (i = 0; i < BE_TABLE_SIZE; i++) {
66 crc = crc32table_be[0][i];
67 for (j = 1; j < 4; j++) {
68 crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
69 crc32table_be[j][i] = crc;
74 static void output_table(uint32_t (*table)[256], int len, char *trans)
78 for (j = 0 ; j < 4; j++) {
80 for (i = 0; i < len - 1; i++) {
81 if (i % ENTRIES_PER_LINE == 0)
83 printf("%s(0x%8.8xL), ", trans, table[j][i]);
85 printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]);
89 int main(int argc, char** argv)
91 printf("/* this file is generated - do not edit */\n\n");
93 if (CRC_LE_BITS > 1) {
95 printf("static const u32 crc32table_le[4][256] = {");
96 output_table(crc32table_le, LE_TABLE_SIZE, "tole");
100 if (CRC_BE_BITS > 1) {
102 printf("static const u32 crc32table_be[4][256] = {");
103 output_table(crc32table_be, BE_TABLE_SIZE, "tobe");