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

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2016  Z. Gilboa                 */

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

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

#include <ntapi/ntapi.h>

#include <ntapi/nt_file.h>

#include "ntapi_impl.h"

int32_t __stdcall __ntapi_tt_open_physical_parent_directory(

	__out	void **		hparent,

	__in	void *		hdir,

	__out	uintptr_t *	buffer,

	__in	uint32_t	buffer_size,

	__in	uint32_t	desired_access,

	__in	uint32_t	open_options,

	__out	int32_t *	type)

{

	int32_t				status;

	nt_oa				oa;

	nt_iosb				iosb;

	wchar16_t *			wch;

	nt_unicode_string *		path;

	uint32_t			len;

	(void)type;

	path = (nt_unicode_string *)buffer;

	if ((status = __ntapi->zw_query_object(

			hdir,

			NT_OBJECT_NAME_INFORMATION,

			path,

			buffer_size,

			&len)))

		return status;

	else if (len == sizeof(nt_unicode_string))

		return NT_STATUS_BAD_FILE_TYPE;

	wch = path->buffer + (path->strlen / sizeof(uint16_t));

	while ((--wch >= path->buffer) && (*wch != '\\'));

	if (wch == path->buffer )

		return NT_STATUS_MORE_PROCESSING_REQUIRED;

	path->strlen = sizeof(uint16_t) * (uint16_t)(wch-path->buffer);

	path->maxlen = 0;

	/* oa */

	oa.len = sizeof(nt_oa);

	oa.root_dir = 0;

	oa.obj_name = path;

	oa.obj_attr = 0;

	oa.sec_desc = 0;

	oa.sec_qos  = 0;

	/* default access */

	desired_access = desired_access

		? desired_access

		: NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_ACCESS;

	/* open parent directory */

	return __ntapi->zw_open_file(

		hparent,

		desired_access,

		&oa,

		&iosb,

		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE,

		open_options | NT_FILE_DIRECTORY_FILE);

}