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- #include <stdio.h>
- #include "crc32defs.h"
- #include <inttypes.h>
- #define ENTRIES_PER_LINE 4
- #define LE_TABLE_SIZE (1 << CRC_LE_BITS)
- #define BE_TABLE_SIZE (1 << CRC_BE_BITS)
- static uint32_t crc32table_le[LE_TABLE_SIZE];
- static uint32_t crc32table_be[BE_TABLE_SIZE];
- /**
- * crc32init_le() - allocate and initialize LE table data
- *
- * crc is the crc of the byte i; other entries are filled in based on the
- * fact that crctable[i^j] = crctable[i] ^ crctable[j].
- *
- */
- static void crc32init_le(void)
- {
- unsigned i, j;
- uint32_t crc = 1;
- crc32table_le[0] = 0;
- for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) {
- crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
- for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
- crc32table_le[i + j] = crc ^ crc32table_le[j];
- }
- }
- /**
- * crc32init_be() - allocate and initialize BE table data
- */
- static void crc32init_be(void)
- {
- unsigned i, j;
- uint32_t crc = 0x80000000;
- crc32table_be[0] = 0;
- for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {
- crc = (crc << 1) ^ ((crc & 0x80000000) ? CRCPOLY_BE : 0);
- for (j = 0; j < i; j++)
- crc32table_be[i + j] = crc ^ crc32table_be[j];
- }
- }
- static void output_table(uint32_t table[], int len, char *trans)
- {
- int i;
- for (i = 0; i < len - 1; i++) {
- if (i % ENTRIES_PER_LINE == 0)
- printf("\n");
- printf("%s(0x%8.8xL), ", trans, table[i]);
- }
- printf("%s(0x%8.8xL)\n", trans, table[len - 1]);
- }
- int main(int argc, char** argv)
- {
- printf("/* this file is generated - do not edit */\n\n");
- if (CRC_LE_BITS > 1) {
- crc32init_le();
- printf("static const u32 crc32table_le[] = {");
- output_table(crc32table_le, LE_TABLE_SIZE, "tole");
- printf("};\n");
- }
- if (CRC_BE_BITS > 1) {
- crc32init_be();
- printf("static const u32 crc32table_be[] = {");
- output_table(crc32table_be, BE_TABLE_SIZE, "tobe");
- printf("};\n");
- }
- return 0;
- }
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