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/*

 * genimg.c -- generate test image

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#define NUM_SECTORS     262144          /* sync with image checker */

#define SECTOR_SIZE     512

/**************************************************************/

void error(char *fmt, ...) {

  va_list ap;

  va_start(ap, fmt);

  printf("Error: ");

  vprintf(fmt, ap);

  printf("\n");

  va_end(ap);

  exit(1);

}

/**************************************************************/

static unsigned int randomState = 0;

void setRandomSeed(unsigned int seed) {

  randomState = seed;

}

unsigned int nextRandomNumber(void) {

  unsigned int retVal;

  retVal = randomState;

  randomState = randomState * 1103515245 + 12345;

  return retVal;

}

/**************************************************************/

static void usage(char *myself) {

  printf("Usage: %s <image file name>\n", myself);

  exit(1);

}

int main(int argc, char *argv[]) {

  char *imageFileName;

  FILE *imageFile;

  unsigned int sector;

  unsigned char buffer[SECTOR_SIZE];

  int i;

  unsigned int number;

  if (argc != 2) {

    usage(argv[0]);

  }

  imageFileName = argv[1];

  imageFile = fopen(imageFileName, "w");

  if (imageFile == NULL) {

    error("cannot open image file '%s'", imageFileName);

  }

  for (sector = 0; sector < NUM_SECTORS; sector++) {

    setRandomSeed(sector);

    for (i = 0; i < SECTOR_SIZE / 4; i++) {

      number = nextRandomNumber();

      buffer[4 * i + 0] = (number >> 24) & 0xFF;

      buffer[4 * i + 1] = (number >> 16) & 0xFF;

      buffer[4 * i + 2] = (number >>  8) & 0xFF;

      buffer[4 * i + 3] = (number >>  0) & 0xFF;

    }

    if (fwrite(buffer, 1, SECTOR_SIZE, imageFile) != SECTOR_SIZE) {

      error("cannot write image file '%s'", imageFileName);

    }

  }

  fclose(imageFile);

  return 0;

}