// SPDX-License-Identifier: GPL-2.0

  #include <stdio.h>

  #include "../include/linux/crc32poly.h"

  #include "../include/generated/autoconf.h"

  #include "crc32defs.h"
  #include <inttypes.h>
  
  #define ENTRIES_PER_LINE 4

  #if CRC_LE_BITS > 8
  # define LE_TABLE_ROWS (CRC_LE_BITS/8)
  # define LE_TABLE_SIZE 256

  #else

  # define LE_TABLE_ROWS 1
  # define LE_TABLE_SIZE (1 << CRC_LE_BITS)

  #endif

  #if CRC_BE_BITS > 8
  # define BE_TABLE_ROWS (CRC_BE_BITS/8)
  # define BE_TABLE_SIZE 256

  #else

  # define BE_TABLE_ROWS 1
  # define BE_TABLE_SIZE (1 << CRC_BE_BITS)

  #endif

  static uint32_t crc32table_le[LE_TABLE_ROWS][256];
  static uint32_t crc32table_be[BE_TABLE_ROWS][256];

  static uint32_t crc32ctable_le[LE_TABLE_ROWS][256];

  
  /**
   * 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_generic(const uint32_t polynomial,
  				 uint32_t (*tab)[256])

  {
  	unsigned i, j;
  	uint32_t crc = 1;

  	tab[0][0] = 0;

  	for (i = LE_TABLE_SIZE >> 1; i; i >>= 1) {

  		crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);

  		for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)

  			tab[0][i + j] = crc ^ tab[0][j];

  	}
  	for (i = 0; i < LE_TABLE_SIZE; i++) {

  		crc = tab[0][i];

  		for (j = 1; j < LE_TABLE_ROWS; j++) {

  			crc = tab[0][crc & 0xff] ^ (crc >> 8);
  			tab[j][i] = crc;

  		}

  	}
  }

  static void crc32init_le(void)
  {

  	crc32init_le_generic(CRC32_POLY_LE, crc32table_le);

  }
  
  static void crc32cinit_le(void)
  {
  	crc32init_le_generic(CRC32C_POLY_LE, crc32ctable_le);
  }

  /**
   * crc32init_be() - allocate and initialize BE table data
   */
  static void crc32init_be(void)
  {
  	unsigned i, j;
  	uint32_t crc = 0x80000000;

  	crc32table_be[0][0] = 0;

  
  	for (i = 1; i < BE_TABLE_SIZE; i <<= 1) {

  		crc = (crc << 1) ^ ((crc & 0x80000000) ? CRC32_POLY_BE : 0);

  		for (j = 0; j < i; j++)

  			crc32table_be[0][i + j] = crc ^ crc32table_be[0][j];
  	}
  	for (i = 0; i < BE_TABLE_SIZE; i++) {
  		crc = crc32table_be[0][i];

  		for (j = 1; j < BE_TABLE_ROWS; j++) {

  			crc = crc32table_be[0][(crc >> 24) & 0xff] ^ (crc << 8);
  			crc32table_be[j][i] = crc;
  		}

  	}
  }

  static void output_table(uint32_t (*table)[256], int rows, int len, char *trans)

  {

  	int i, j;

  	for (j = 0 ; j < rows; j++) {

  		printf("{");
  		for (i = 0; i < len - 1; i++) {
  			if (i % ENTRIES_PER_LINE == 0)
  				printf("
  ");
  			printf("%s(0x%8.8xL), ", trans, table[j][i]);
  		}
  		printf("%s(0x%8.8xL)},
  ", trans, table[j][len - 1]);

  	}

  }
  
  int main(int argc, char** argv)
  {
  	printf("/* this file is generated - do not edit */
  
  ");
  
  	if (CRC_LE_BITS > 1) {
  		crc32init_le();

  		printf("static const u32 ____cacheline_aligned "

  		       "crc32table_le[%d][%d] = {",
  		       LE_TABLE_ROWS, LE_TABLE_SIZE);
  		output_table(crc32table_le, LE_TABLE_ROWS,
  			     LE_TABLE_SIZE, "tole");

  		printf("};
  ");
  	}
  
  	if (CRC_BE_BITS > 1) {
  		crc32init_be();

  		printf("static const u32 ____cacheline_aligned "

  		       "crc32table_be[%d][%d] = {",
  		       BE_TABLE_ROWS, BE_TABLE_SIZE);
  		output_table(crc32table_be, LE_TABLE_ROWS,
  			     BE_TABLE_SIZE, "tobe");

  		printf("};
  ");
  	}

  	if (CRC_LE_BITS > 1) {
  		crc32cinit_le();

  		printf("static const u32 ____cacheline_aligned "

  		       "crc32ctable_le[%d][%d] = {",
  		       LE_TABLE_ROWS, LE_TABLE_SIZE);
  		output_table(crc32ctable_le, LE_TABLE_ROWS,
  			     LE_TABLE_SIZE, "tole");
  		printf("};
  ");
  	}

  
  	return 0;
  }