Blame src/logic/pe_map_raw_image.c

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/***************************************************************/
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/*  perk: PE Resource Kit                                      */
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/*  Copyright (C) 2015--2021  SysDeer Technologies, LLC        */
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/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */
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/***************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <perk/perk.h>
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#include "perk_driver_impl.h"
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#include "perk_errinfo_impl.h"
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int pe_map_raw_image(
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	const struct pe_driver_ctx *	dctx,
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	int				fd,
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	const char *			path,
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	int				prot,
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	struct pe_raw_image *		map)
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{
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	int		ret;
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	struct stat	st;
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	bool		fnew;
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	int		fdcwd;
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	fdcwd = pe_driver_fdcwd(dctx);
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	if ((fnew = (fd < 0)))
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		fd  = openat(fdcwd,path,O_RDONLY | O_CLOEXEC);
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	if (fd < 0)
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		return PERK_SYSTEM_ERROR(dctx);
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	if ((ret = fstat(fd,&st) < 0) && fnew)
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		close(fd);
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	else if ((st.st_size == 0) && fnew)
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		close(fd);
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	if (ret < 0)
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		return PERK_SYSTEM_ERROR(dctx);
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	else if (st.st_size == 0)
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		return PERK_CUSTOM_ERROR(
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			dctx,PERK_ERR_IMAGE_SIZE_ZERO);
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	map->map_size = st.st_size;
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	map->map_addr = mmap(0,map->map_size,prot,MAP_PRIVATE,fd,0);
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	if (fnew)
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		close(fd);
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	return (map->map_addr == MAP_FAILED)
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		? PERK_SYSTEM_ERROR(dctx)
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		: 0;
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}
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int pe_unmap_raw_image(struct pe_raw_image * map)
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{
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	return munmap(map->map_addr,map->map_size);
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}