#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "fileLoader.h"

struct OpenFile
{
	char *fileData;
	int fileSize;
};

struct OpenFile load_file_to_mem(char *filename) {
	struct OpenFile file;
	int fd = open(filename, O_RDONLY);

	if (fd < 0) {
	    printf("\n\"%s \" could not open", filename);
	    exit(1);
	}

	struct stat statbuf;
	int err = fstat(fd, &statbuf);
	if (err < 0) {
	    printf("\n\"%s \" could not open", filename);
	    exit(2);
	}

	char *filecontents = mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if (filecontents == MAP_FAILED) {
	    printf("Mapping failed");
	    exit(3);
	}
	file.fileSize = statbuf.st_size;
  file.fileData = malloc(file.fileSize);
	memcpy(file.fileData, filecontents, file.fileSize);
	
  if (err != 0) {
  	printf("Unmapping failed");
  	exit(1);
  }

	return file;
}

int unmap_file(char *ptr, char *filename) {
	int fd = open(filename, O_RDONLY);

        if (fd < 0) {
            printf("\n\"%s \" could not open", filename);
            exit(1);
        }

        struct stat statbuf;
        int err = fstat(fd, &statbuf); 
	err = munmap(ptr, statbuf.st_size);
        if (err != 0)
        {
                printf("Unmapping failed");
                return 1;
	}
	return 0;	
}