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

/*  ntapi: Native API core library                      */

/*  Copyright (C) 2013--2021  SysDeer Technologies, LLC */

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

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

#include <psxtypes/psxtypes.h>

#include <pemagine/pemagine.h>

#include <ntapi/nt_sysinfo.h>

#include <ntapi/nt_memory.h>

#include <ntapi/ntapi.h>

#include <ntapi/nt_atomic.h>

#include "ntapi_impl.h"

int32_t __stdcall __ntapi_tt_get_system_directory_native_path(

	__out	nt_mem_sec_name *	buffer,

	__in	uint32_t		buffer_size,

	__in	wchar16_t *		base_name,

	__in	uint32_t		base_name_size,

	__out	nt_unicode_string *	nt_path		__optional)

{

	int32_t			status;

	wchar16_t *		wch_src;

	wchar16_t *		wch_dst;

	wchar16_t *		wch_cap;

	size_t			maxlen_saved;

	size_t			info_size;

	/* validation */

	if (!buffer || !buffer_size)

		return NT_STATUS_BUFFER_TOO_SMALL;

	else if (base_name && !base_name_size)

		return NT_STATUS_INVALID_PARAMETER_MIX;

	/* init buffer */

	buffer->section_name.strlen = 0;

	buffer->section_name.maxlen = (uint16_t)(buffer_size - sizeof(nt_unicode_string));

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

	maxlen_saved = buffer->section_name.maxlen;

	info_size    = 0;

	status = __ntapi->zw_query_virtual_memory(

		NT_CURRENT_PROCESS_HANDLE,

		pe_get_ntdll_module_handle(),

		NT_MEMORY_SECTION_NAME,

		buffer,

		buffer_size,

		&info_size);

	if (status != NT_STATUS_SUCCESS)

		return status;

	/* find directory portion */

	wch_dst = buffer->section_name.buffer + (buffer->section_name.strlen / sizeof(wchar16_t));

	wch_dst--;

	while ((*wch_dst != '\\') && (wch_dst > buffer->section_name.buffer))

		wch_dst--;

	if (wch_dst == buffer->section_name.buffer)

		return NT_STATUS_INTERNAL_ERROR;

	/* base_name */

	if (base_name) {

		wch_dst++;

		wch_src	= base_name;

		wch_cap = (wchar16_t *)((uintptr_t)wch_dst + base_name_size);

		if ((uintptr_t)wch_cap - (uintptr_t)(buffer->section_name.buffer) > maxlen_saved)

			return NT_STATUS_BUFFER_TOO_SMALL;

		while (wch_dst < wch_cap) {

			*wch_dst = *wch_src;

			wch_dst++;

			wch_src++;

		}

	}

	/* null termination */

	*wch_dst = 0;

	/* nt_path */

	if (nt_path)

		__ntapi->rtl_init_unicode_string(

			nt_path,

			buffer->section_name.buffer);

	return NT_STATUS_SUCCESS;

}

int32_t __stdcall __ntapi_tt_get_system_directory_handle(

	__out	void **			hsysdir,

	__out	nt_mem_sec_name *	buffer		__optional,

	__in	uint32_t		buffer_size	__optional)

{

	int32_t			status;

	nt_oa			oa;

	nt_iosb			iosb;

	nt_unicode_string	path;

	char			_buffer[256];

	/* validation */

	if (!hsysdir)

		return NT_STATUS_INVALID_PARAMETER_1;

	else if (buffer_size && buffer_size < 0x20)

		return NT_STATUS_BUFFER_TOO_SMALL;

	/* buffer */

	if (!buffer) {

		buffer		= (nt_mem_sec_name *)_buffer;

		buffer_size	= sizeof(_buffer);

		__ntapi->tt_aligned_block_memset(buffer,0,sizeof(buffer));

	}

	/* sysdir path */

	status = __ntapi_tt_get_system_directory_native_path(

		buffer,

		buffer_size,

		(wchar16_t *)0,

		0,

		&path);

	if (status != NT_STATUS_SUCCESS)

		return status;

	/* oa */

	oa.len = sizeof(nt_oa);

	oa.root_dir = (void *)0;

	oa.obj_name = &pat;;

	oa.obj_attr = 0;

	oa.sec_desc = 0;

	oa.sec_qos = 0;

	/* open file/folder */

	status = __ntapi->zw_open_file(

		hsysdir,

		NT_SEC_SYNCHRONIZE | NT_FILE_READ_ATTRIBUTES | NT_FILE_READ_ACCESS,

		&oa,

		&iosb,

		NT_FILE_SHARE_READ | NT_FILE_SHARE_WRITE,

		NT_FILE_DIRECTORY_FILE | NT_FILE_SYNCHRONOUS_IO_ALERT);

	return status;

}

int32_t __stdcall __ntapi_tt_get_system_directory_dos_path(

	__in	void *			hsysdir		__optional,

	__out	wchar16_t *		buffer,

	__in	uint32_t		buffer_size,

	__in	wchar16_t *		base_name,

	__in	uint32_t		base_name_size,

	__out	nt_unicode_string *	nt_path		__optional)

{

	int32_t			status;

	nt_statfs		statfs;

	wchar16_t *		wch;

	wchar16_t *		wch_src;

	wchar16_t *		wch_cap;

	nt_iosb			iosb;

	nt_fni *		fni;

	uint32_t		fni_length;

	/* validation */

	if (!buffer)

		return NT_STATUS_INVALID_PARAMETER_2;

	/* hsysdir */

	if (!hsysdir) {

		status = __ntapi_tt_get_system_directory_handle(

			&hsysdir,

			(nt_mem_sec_name *)buffer,

			buffer_size);

		if (status != NT_STATUS_SUCCESS)

			return status;

	}

	/* statfs */

	status = __ntapi->tt_statfs(

			hsysdir,

			&statfs,sizeof(statfs),

			(uintptr_t *)buffer,buffer_size,

			NT_STATFS_DOS_DRIVE_LETTER);

	if (status != NT_STATUS_SUCCESS)

		return status;

	/* dos path name (always shorter than the native path, so buffer_size must be ok) */

	wch = buffer;

	*wch = '\\'; wch++;

	*wch = '?';  wch++;

	*wch = '?';  wch++;

	*wch = '\\'; wch++;

	*wch = statfs.nt_drive_letter; wch++;

	*wch = ':';  wch++;

	/* alignment */

	fni  = (nt_fni *)((uintptr_t)buffer + 0x10);

	status = __ntapi->zw_query_information_file(

		hsysdir,

		&iosb,

		fni,

		buffer_size - 8 * sizeof(wchar16_t),

		NT_FILE_NAME_INFORMATION);

	if (status != NT_STATUS_SUCCESS)

		return status;

	/* fni->file_name_length: save */

	fni_length = fni->file_name_length;

	/* overwrite */

	wch_src  = fni->file_name;

	wch_cap  = (wchar16_t *)((uintptr_t)wch_src + fni_length);

	while (wch_src < wch_cap) {

		*wch = *wch_src;

		wch++;

		wch_src++;

	}

	/* ultimate path separator */

	*wch = '\\'; wch++;

	/* base_name */

	if (base_name) {

		wch_src	= base_name;

		wch_cap = (wchar16_t *)((uintptr_t)wch + base_name_size);

		if ((uintptr_t)wch_cap - (uintptr_t)buffer - sizeof(wchar16_t) > buffer_size)

			return NT_STATUS_BUFFER_TOO_SMALL;

		while (wch < wch_cap) {

			*wch = *wch_src;

			wch++;

			wch_src++;

		}

	}

	/* null termination */

	*wch = 0;

	/* nt_path */

	if (nt_path)

		__ntapi->rtl_init_unicode_string(

			nt_path,

			buffer);

	return NT_STATUS_SUCCESS;

}