11da177e4SLinus Torvalds #include <stdio.h> 21da177e4SLinus Torvalds #include "crc32defs.h" 31da177e4SLinus Torvalds #include <inttypes.h> 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds #define ENTRIES_PER_LINE 4 61da177e4SLinus Torvalds 71da177e4SLinus Torvalds #define LE_TABLE_SIZE (1 << CRC_LE_BITS) 81da177e4SLinus Torvalds #define BE_TABLE_SIZE (1 << CRC_BE_BITS) 91da177e4SLinus Torvalds 10*836e2af9SJoakim Tjernlund static uint32_t crc32table_le[4][LE_TABLE_SIZE]; 11*836e2af9SJoakim Tjernlund static uint32_t crc32table_be[4][BE_TABLE_SIZE]; 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds /** 141da177e4SLinus Torvalds * crc32init_le() - allocate and initialize LE table data 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * crc is the crc of the byte i; other entries are filled in based on the 171da177e4SLinus Torvalds * fact that crctable[i^j] = crctable[i] ^ crctable[j]. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds static void crc32init_le(void) 211da177e4SLinus Torvalds { 221da177e4SLinus Torvalds unsigned i, j; 231da177e4SLinus Torvalds uint32_t crc = 1; 241da177e4SLinus Torvalds 25*836e2af9SJoakim Tjernlund crc32table_le[0][0] = 0; 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) { 281da177e4SLinus Torvalds crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0); 291da177e4SLinus Torvalds for (j = 0; j < LE_TABLE_SIZE; j += 2 * i) 30*836e2af9SJoakim Tjernlund crc32table_le[0][i + j] = crc ^ crc32table_le[0][j]; 31*836e2af9SJoakim Tjernlund } 32*836e2af9SJoakim Tjernlund for (i = 0; i < LE_TABLE_SIZE; i++) { 33*836e2af9SJoakim Tjernlund crc = crc32table_le[0][i]; 34*836e2af9SJoakim Tjernlund for (j = 1; j < 4; j++) { 35*836e2af9SJoakim Tjernlund crc = crc32table_le[0][crc & 0xff] ^ (crc >> 8); 36*836e2af9SJoakim Tjernlund crc32table_le[j][i] = crc; 37*836e2af9SJoakim Tjernlund } 381da177e4SLinus Torvalds } 391da177e4SLinus Torvalds } 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds /** 421da177e4SLinus Torvalds * crc32init_be() - allocate and initialize BE table data 431da177e4SLinus Torvalds */ 441da177e4SLinus Torvalds static void crc32init_be(void) 451da177e4SLinus Torvalds { 461da177e4SLinus Torvalds unsigned i, j; 471da177e4SLinus Torvalds uint32_t crc = 0x80000000; 481da177e4SLinus Torvalds 49*836e2af9SJoakim Tjernlund crc32table_be[0][0] = 0; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds for (i = 1; i < BE_TABLE_SIZE; i <<= 1) { 521da177e4SLinus Torvalds crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0); 531da177e4SLinus Torvalds for (j = 0; j < i; j++) 54*836e2af9SJoakim Tjernlund crc32table_be[0][i + j] = crc ^ crc32table_be[0][j]; 55*836e2af9SJoakim Tjernlund } 56*836e2af9SJoakim Tjernlund for (i = 0; i < BE_TABLE_SIZE; i++) { 57*836e2af9SJoakim Tjernlund crc = crc32table_be[0][i]; 58*836e2af9SJoakim Tjernlund for (j = 1; j < 4; j++) { 59*836e2af9SJoakim Tjernlund crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8); 60*836e2af9SJoakim Tjernlund crc32table_be[j][i] = crc; 61*836e2af9SJoakim Tjernlund } 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds } 641da177e4SLinus Torvalds 65*836e2af9SJoakim Tjernlund static void output_table(uint32_t table[4][256], int len, char *trans) 661da177e4SLinus Torvalds { 67*836e2af9SJoakim Tjernlund int i, j; 681da177e4SLinus Torvalds 69*836e2af9SJoakim Tjernlund for (j = 0 ; j < 4; j++) { 70*836e2af9SJoakim Tjernlund printf("{"); 711da177e4SLinus Torvalds for (i = 0; i < len - 1; i++) { 721da177e4SLinus Torvalds if (i % ENTRIES_PER_LINE == 0) 731da177e4SLinus Torvalds printf("\n"); 74*836e2af9SJoakim Tjernlund printf("%s(0x%8.8xL), ", trans, table[j][i]); 751da177e4SLinus Torvalds } 76*836e2af9SJoakim Tjernlund printf("%s(0x%8.8xL)},\n", trans, table[j][len - 1]); 77*836e2af9SJoakim Tjernlund } 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds int main(int argc, char** argv) 811da177e4SLinus Torvalds { 821da177e4SLinus Torvalds printf("/* this file is generated - do not edit */\n\n"); 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds if (CRC_LE_BITS > 1) { 851da177e4SLinus Torvalds crc32init_le(); 86*836e2af9SJoakim Tjernlund printf("static const u32 crc32table_le[4][256] = {"); 871da177e4SLinus Torvalds output_table(crc32table_le, LE_TABLE_SIZE, "tole"); 881da177e4SLinus Torvalds printf("};\n"); 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds if (CRC_BE_BITS > 1) { 921da177e4SLinus Torvalds crc32init_be(); 93*836e2af9SJoakim Tjernlund printf("static const u32 crc32table_be[4][256] = {"); 941da177e4SLinus Torvalds output_table(crc32table_be, BE_TABLE_SIZE, "tobe"); 951da177e4SLinus Torvalds printf("};\n"); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds return 0; 991da177e4SLinus Torvalds } 100