File IO

Open file, turn to binary and print

#include <stdio.h>
#include <stdlib.h>
void AddBinary(int number, int *array, int startIndex)
{
 for(int i = startIndex; i < startIndex + 8; i++)
 {
  if(number % 2 == 0)
  {
   array[i] = 0;
  }
  else
  {
   array[i] = 1;
  }
  number /= 2;
 }
}
int *OpenFile(char *fileName, int *fileLength)
{
 FILE *fp = fopen(fileName, "rb");
 if(fp == NULL)
 {
  return NULL;
 }
 fseek(fp, 0L, SEEK_END);
 *fileLength = ftell(fp) * 8;
 rewind(fp);
 int c = 0;
 int index = 0;
 int *file = malloc(*fileLength * sizeof(int));
 while((c = fgetc(fp)) != EOF)
 { 
  AddBinary(c, file, index * 8);
  index++;
 }
 fclose(fp);
 return file; 
}
void PrintFileBinary(int *file, int fileLength)
{
 for(int i = 0; i < fileLength; i++)
 {
  if(i > 0 && i %8 == 0)
  {
   putchar('\n');
  }
  printf("%d", file[i]);
 }
}
int main()
{
 int fileLength = 0;
 char *fileName = "main.c";
 int *file = OpenFile(fileName,&fileLength);
 if(file == NULL)
 {
  printf("%s does not exist\n",fileName);
  return 0;
 }
 PrintFileBinary(file, fileLength);
 free(file);
 return 0;
}