/*
 * Humax EPG Tool
 * by af123, 2011
 */

#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <time.h>
#include <strings.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mman.h>

#include "lint.h"

struct epg *
open_file(char *filename)
{
	struct epg *epg;
	struct stat st, st2;

	if (debug)
		printf("Opening file '%s'\n", filename);

	if (stat(filename, &st) == -1)
	{
		perror(filename);
		return NULL;
	}
	sleep(1);
	if (stat(filename, &st2) == -1)
	{
		perror(filename);
		return NULL;
	}
	if (st.st_size != st2.st_size)
	{
		printf("EPG data file is updating, try later.\n");
		return NULL;
	}

	if (!(epg = malloc(sizeof(struct epg))))
	{
		perror("malloc");
		return NULL;
	}

	strcpy(epg->fname, filename);
	epg->binsize = st.st_size;

	if (debug)
		printf("Opening %s, %lu bytes.\n", epg->fname,
		    (unsigned long)epg->binsize);

	if ((epg->fd = open(epg->fname, O_RDONLY, 0)) == -1)
	{
		perror(epg->fname);
		free(epg);
		return NULL;
	}

	epg->bin = (uint8_t *)mmap(NULL, epg->binsize, PROT_READ,
	    MAP_PRIVATE, epg->fd, 0);
	if (epg->bin == MAP_FAILED)
	{
		perror("mmap");
		close(epg->fd);
		free(epg);
		return NULL;
	}

	epg->offset = 0;

	return epg;
}

void
close_file(struct epg *epg)
{
	if (debug)
		printf("Closing file.\n");

	munmap((void *)epg->bin, epg->binsize);
	if (epg->fd > 0)
		close(epg->fd);
	epg->fd = -1;
}