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/*****************************************************************************/
/* 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"
int32_t pe_open_physical_parent_directory(
__out void ** hparent,
__in void * href,
__out uintptr_t * buffer,
__in uint32_t buffer_size,
__in uint32_t oattr,
__in uint32_t desired_access,
__in uint32_t share_access,
__in uint32_t open_options)
{
int32_t status;
struct os_oa oa;
struct os_iosb iosb;
wchar16_t * wch;
wchar16_t * root;
struct pe_unicode_str * path;
uint32_t len;
int mup;
void * hntdll;
os_zw_query_object * zw_query_object;
os_zw_open_file * zw_open_file;
/* init */
path = (struct pe_unicode_str *)buffer;
if (!(hntdll = pe_get_ntdll_module_handle()))
return OS_STATUS_INTERNAL_ERROR;
if (!(zw_query_object = (os_zw_query_object *)pe_get_procedure_address(
hntdll,"ZwQueryObject")))
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 base directory */
if ((status = zw_query_object(
href,
OS_OBJECT_NAME_INFORMATION,
path,
buffer_size,
&len)))
return status;
/* integrity */
if (len == sizeof(struct pe_unicode_str))
return OS_STATUS_BAD_FILE_TYPE;
/* device root directory */
root = path->buffer;
wch = path->buffer + (path->strlen / sizeof(uint16_t));
if ((wch < &root[8])
|| (root[0] != '\\')
|| (root[1] != 'D') || (root[2] != 'e')
|| (root[3] != 'v') || (root[4] != 'i')
|| (root[5] != 'c') || (root[6] != 'e')
|| (root[7] != '\\'))
return OS_STATUS_INTERNAL_ERROR;
mup = (wch > &root[11])
&& (root[8]=='M')
&& (root[9]=='u')
&& (root[10]=='p')
&& (root[11]=='\\');
root = mup ? &root[12] : &root[8];
for (; (root<wch) && (*root!='\\'); )
root++;
if (root == wch)
return OS_STATUS_INTERNAL_ERROR;
if (mup)
for (root++; (root<wch) && (*root!='\\'); )
root++;
if (root == wch)
return OS_STATUS_INTERNAL_ERROR;
if (&root[1] == wch)
return OS_STATUS_MORE_PROCESSING_REQUIRED;
if (wch[-1] == '\\')
wch--;
/* physical parent directory path */
for (root++; (wch>=root) && (wch[-1]!='\\'); )
wch--;
path->strlen = (uint16_t)(wch - path->buffer) * sizeof(uint16_t);
path->maxlen = 0;
/* oa */
oa.len = sizeof(struct os_oa);
oa.root_dir = 0;
oa.obj_name = path;
oa.obj_attr = oattr;
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 parent directory */
return zw_open_file(
hparent,
desired_access,
&oa,&iosb,
share_access,
open_options | OS_FILE_DIRECTORY_FILE);
}
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