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

/*  pemagination: a (virtual) tour into portable bits and executable bytes   */

/*  Copyright (C) 2013--2017  Z. Gilboa                                      */

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

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

#include <psxtypes/psxtypes.h>

#include <pemagine/pemagine.h>

#include <pemagine/pe_structs.h>

#include "pe_os.h"

struct os_memory_section_name {

	struct pe_unicode_str	section_name;

	wchar16_t		section_name_buffer[];

};

pe_api int32_t pe_open_image_from_addr(

	__out	void **			himage,

	__in	void *			addr,

	__out	uintptr_t *		buffer,

	__in	uint32_t		buffer_size,

	__in	uint32_t		desired_access,

	__in	uint32_t		open_options)

{

	int32_t				status;

	struct os_oa			oa;

	struct os_iosb			iosb;

	struct os_memory_section_name *	path;

	uint32_t			len;

	void *				hntdll;

	os_zw_query_virtual_memory *	zw_query_virtual_memory;

	os_zw_open_file *		zw_open_file;

	/* init */

	path = (struct os_memory_section_name *)buffer;

	path->section_name.strlen = 0;

	path->section_name.maxlen = (uint16_t)(buffer_size - sizeof(struct pe_unicode_str));

	path->section_name.buffer = path->section_name_buffer;

	if (!(hntdll = pe_get_ntdll_module_handle()))

		return OS_STATUS_INTERNAL_ERROR;

	if (!(zw_query_virtual_memory = (os_zw_query_virtual_memory *)pe_get_procedure_address(

			hntdll,"ZwQueryVirtualMemory")))

		return OS_STATUS_INTERNAL_ERROR;

	if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(

			hntdll,"ZwOpenFile")))

		return OS_STATUS_INTERNAL_ERROR;

	/* native path of image containing addr */

	if ((status = zw_query_virtual_memory(

			OS_CURRENT_PROCESS_HANDLE,

			addr,

			OS_MEMORY_SECTION_NAME,

			buffer,

			buffer_size,

			&len)))

		return status;

	/* oa */

	oa.len      = sizeof(struct os_oa);

	oa.root_dir = 0;

	oa.obj_name = &path->section_name;

	oa.obj_attr = 0;

	oa.sec_desc = 0;

	oa.sec_qos  = 0;

	/* default access */

	desired_access = desired_access

		? desired_access

		: OS_SEC_SYNCHRONIZE | OS_FILE_READ_ATTRIBUTES | OS_FILE_READ_ACCESS;

	/* open image */

	return zw_open_file(

		himage,

		desired_access,

		&oa,

		&iosb,

		OS_FILE_SHARE_READ | OS_FILE_SHARE_WRITE,

		open_options | OS_FILE_NON_DIRECTORY_FILE);

}