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

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

/*  Copyright (C) 2013--2020  SysDeer Technologies, LLC                      */

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

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

#include <psxtypes/psxtypes.h>

#include <pemagine/pemagine.h>

#include "pe_os.h"

int32_t pe_find_framework_loader(

	struct pe_framework_runtime_data *	rtdata,

	const wchar16_t *			basename,

	const wchar16_t *			rrelname,

	void *					refaddr,

	uintptr_t *				buffer,

	uint32_t				bufsize,

	uint32_t				flags)

{

	int32_t			status;

	struct pe_unicode_str	path;

	struct os_oa		oa;

	struct os_iosb		iosb;

	void *			himage;

	void *			himgdir;

	void *			hdsodir;

	void *			hloader;

	void *			hparent;

	void *			hprevious;

	const wchar16_t *	wch;

	const wchar16_t *	wch_cap;

	void *			hntdll;

	os_zw_close *		zw_close;

	os_zw_open_file *	zw_open_file;

	/* init */

	if (!(hntdll = pe_get_ntdll_module_handle()))

		return OS_STATUS_INTERNAL_ERROR;

	if (!(zw_close = (os_zw_close *)pe_get_procedure_address(

			hntdll,"ZwClose")))

		return OS_STATUS_INTERNAL_ERROR;

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

			hntdll,"ZwOpenFile")))

		return OS_STATUS_INTERNAL_ERROR;

	/* flags */

	if (flags == PE_LDSO_INTEGRAL_ONLY)

		(void)0;

	else if (flags == PE_LDSO_DEFAULT_EXECUTABLE)

		(void)0;

	else if (flags == PE_LDSO_STANDALONE_EXECUTABLE)

		(void)0;

	else

		return OS_STATUS_INVALID_PARAMETER;

	/* oa */

	oa.len      = sizeof(struct os_oa);

	oa.root_dir = 0;

	oa.obj_name = &pat;;

	oa.obj_attr = OS_OBJ_CASE_INSENSITIVE;

	oa.sec_desc = 0;

	oa.sec_qos  = 0;

	/* standalone executable? */

	if (flags == PE_LDSO_STANDALONE_EXECUTABLE) {

		wch     = basename;

		wch_cap = basename + 512;

		for (; *wch && wch

			if ((*wch == '\\') || (*wch == '/'))

				return OS_STATUS_INVALID_PARAMETER;

		if (*wch)

			return OS_STATUS_NAME_TOO_LONG;

		path.buffer = (wchar16_t *)basename;

		path.strlen = sizeof(wchar16_t) * (wch - basename);

		path.maxlen = 0;

		if ((status = pe_open_image_from_addr(

				&himage,refaddr,

				buffer,bufsize,

				0,

				OS_SEC_SYNCHRONIZE

					| OS_FILE_READ_ACCESS

					| OS_FILE_READ_ATTRIBUTES,

				OS_FILE_SHARE_READ

					| OS_FILE_SHARE_WRITE

					| OS_FILE_SHARE_DELETE,

				0)))

			return status;

		if ((status = pe_open_physical_parent_directory(

				&hdsodir,himage,

				buffer,bufsize,

				0,

				OS_SEC_SYNCHRONIZE

					| OS_FILE_READ_ACCESS

					| OS_FILE_READ_ATTRIBUTES,

				OS_FILE_SHARE_READ

					| OS_FILE_SHARE_WRITE

					| OS_FILE_SHARE_DELETE,

				0)))

			return status;

		oa.root_dir = hdsodir;

		if ((status = zw_open_file(

				&hloader,

				OS_SEC_SYNCHRONIZE

					| OS_FILE_READ_ACCESS

					| OS_FILE_READ_ATTRIBUTES,

				&oa,&iosb,

				OS_FILE_SHARE_READ

					| OS_FILE_SHARE_WRITE

					| OS_FILE_SHARE_DELETE,

				OS_FILE_NON_DIRECTORY_FILE)))

			return status;

		if (rtdata->hloader)

			zw_close(hloader);

		else

			rtdata->hloader = hloader;

		rtdata->hdsodir = hdsodir;

		rtdata->himage  = himage;

		return OS_STATUS_SUCCESS;

	}

	/* root-relative loader path */

	wch     = rrelname;

	wch_cap = rrelname + 512;

	for (; *wch && wch

		wch++;

	if (*wch)

		return OS_STATUS_NAME_TOO_LONG;

	path.buffer = (wchar16_t *)rrelname;

	path.strlen = sizeof(wchar16_t) * (wch - rrelname);

	path.maxlen = 0;

	/* inherited root directory? */

	if (rtdata->hroot) {

		oa.root_dir = rtdata->hroot;

		if ((status = zw_open_file(

				&hloader,

				OS_SEC_SYNCHRONIZE

					| OS_FILE_READ_ACCESS

					| OS_FILE_READ_ATTRIBUTES,

				&oa,&iosb,

				OS_FILE_SHARE_READ

					| OS_FILE_SHARE_WRITE

					| OS_FILE_SHARE_DELETE,

				OS_FILE_NON_DIRECTORY_FILE)))

			return status;

		if (rtdata->hloader)

			zw_close(hloader);

		else

			rtdata->hloader = hloader;

		rtdata->hdsodir = 0;

		return OS_STATUS_SUCCESS;

	}

	/* integral only and no inherited root directory? */

	if (flags == PE_LDSO_INTEGRAL_ONLY)

		return OS_STATUS_COULD_NOT_INTERPRET;

	/* finde Pluto / find Waldo */

	if ((status = pe_open_image_from_addr(

			&himage,refaddr,

			buffer,bufsize,

			0,

			OS_SEC_SYNCHRONIZE

				| OS_FILE_READ_ACCESS

				| OS_FILE_READ_ATTRIBUTES,

			OS_FILE_SHARE_READ

				| OS_FILE_SHARE_WRITE

				| OS_FILE_SHARE_DELETE,

			0)))

		return status;

	if ((status = pe_open_physical_parent_directory(

			&himgdir,himage,

			buffer,bufsize,

			0,

			OS_SEC_SYNCHRONIZE

				| OS_FILE_READ_ACCESS

				| OS_FILE_READ_ATTRIBUTES,

			OS_FILE_SHARE_READ

				| OS_FILE_SHARE_WRITE

				| OS_FILE_SHARE_DELETE,

			0)))

		return status;

	if ((status = pe_open_physical_parent_directory(

			&hparent,himgdir,

			buffer,bufsize,

			OS_OBJ_INHERIT,

			OS_SEC_SYNCHRONIZE

				| OS_FILE_READ_ACCESS

				| OS_FILE_READ_ATTRIBUTES,

			OS_FILE_SHARE_READ

				| OS_FILE_SHARE_WRITE

				| OS_FILE_SHARE_DELETE,

			0)))

		return status;

	zw_close(himgdir);

	hloader     = 0;

	oa.root_dir = hparent;

	status = zw_open_file(

		&hloader,

		OS_SEC_SYNCHRONIZE

			| OS_FILE_READ_ACCESS

			| OS_FILE_READ_ATTRIBUTES,

		&oa,&iosb,

		OS_FILE_SHARE_READ

			| OS_FILE_SHARE_WRITE

			| OS_FILE_SHARE_DELETE,

		OS_FILE_NON_DIRECTORY_FILE);

	while (!hloader) {

		if (status == OS_STATUS_OBJECT_NAME_NOT_FOUND)

			(void)0;

		else if (status == OS_STATUS_OBJECT_PATH_NOT_FOUND)

			(void)0;

		else

			return status;

		hprevious = hparent;

		if ((status = pe_open_physical_parent_directory(

				&hparent,hprevious,

				buffer,bufsize,

				OS_OBJ_INHERIT,

				OS_SEC_SYNCHRONIZE

					| OS_FILE_READ_ACCESS

					| OS_FILE_READ_ATTRIBUTES,

				OS_FILE_SHARE_READ

					| OS_FILE_SHARE_WRITE

					| OS_FILE_SHARE_DELETE,

				0)))

			return status;

		oa.root_dir = hparent;

		status = zw_open_file(

			&hloader,

			OS_SEC_SYNCHRONIZE

				| OS_FILE_READ_ACCESS

				| OS_FILE_READ_ATTRIBUTES,

			&oa,&iosb,

			OS_FILE_SHARE_READ

				| OS_FILE_SHARE_WRITE

				| OS_FILE_SHARE_DELETE,

			OS_FILE_NON_DIRECTORY_FILE);

		zw_close(hprevious);

	}

	if (rtdata->hloader)

		zw_close(hloader);

	else

		rtdata->hloader = hloader;

	rtdata->hdsodir = 0;

	rtdata->himage  = himage;

	rtdata->hroot   = hparent;

	return OS_STATUS_SUCCESS;

}