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

/*  perk: PE Resource Kit                                      */

/*  Copyright (C) 2015--2021  Z. Gilboa                        */

/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */

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

#include <stdint.h>

#include <stdbool.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/mman.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <perk/perk.h>

#include "perk_driver_impl.h"

#include "perk_errinfo_impl.h"

int pe_map_raw_image(

	const struct pe_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	int				prot,

	struct pe_raw_image *		map)

{

	int		ret;

	struct stat	st;

	bool		fnew;

	int		fdcwd;

	fdcwd = pe_driver_fdcwd(dctx);

	if ((fnew = (fd < 0)))

		fd  = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);

	if (fd < 0)

		return PERK_SYSTEM_ERROR(dctx);

	if ((ret = fstat(fd,&st) < 0) && fnew)

		close(fd);

	else if ((st.st_size == 0) && fnew)

		close(fd);

	if (ret < 0)

		return PERK_SYSTEM_ERROR(dctx);

	else if (st.st_size == 0)

		return PERK_CUSTOM_ERROR(

			dctx,PERK_ERR_IMAGE_SIZE_ZERO);

	map->map_size = st.st_size;

	map->map_addr = mmap(0,map->map_size,prot,MAP_PRIVATE,fd,0);

	if (fnew)

		close(fd);

	return (map->map_addr == MAP_FAILED)

		? PERK_SYSTEM_ERROR(dctx)

		: 0;

}

int pe_unmap_raw_image(struct pe_raw_image * map)

{

	return munmap(map->map_addr,map->map_size);

}