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/*****************************************************************************/
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/* pemagination: a (virtual) tour into portable bits and executable bytes */
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/* Copyright (C) 2013--2017 Z. Gilboa */
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/* Released under GPLv2 and GPLv3; see COPYING.PEMAGINE. */
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/*****************************************************************************/
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#include <psxtypes/psxtypes.h>
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#include <pemagine/pemagine.h>
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#include <pemagine/pe_structs.h>
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#include "pe_os.h"
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int32_t pe_open_physical_parent_directory(
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__out void ** hparent,
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__in void * href,
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__out uintptr_t * buffer,
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__in uint32_t buffer_size,
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__in uint32_t oattr,
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__in uint32_t desired_access,
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__in uint32_t share_access,
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__in uint32_t open_options)
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{
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int32_t status;
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struct os_oa oa;
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struct os_iosb iosb;
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wchar16_t * wch;
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wchar16_t * root;
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struct pe_unicode_str * path;
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uint32_t len;
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void * hntdll;
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os_zw_query_object * zw_query_object;
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os_zw_open_file * zw_open_file;
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/* init */
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path = (struct pe_unicode_str *)buffer;
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if (!(hntdll = pe_get_ntdll_module_handle()))
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return OS_STATUS_INTERNAL_ERROR;
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if (!(zw_query_object = (os_zw_query_object *)pe_get_procedure_address(
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hntdll,"ZwQueryObject")))
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return OS_STATUS_INTERNAL_ERROR;
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if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(
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hntdll,"ZwOpenFile")))
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return OS_STATUS_INTERNAL_ERROR;
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/* native path of base directory */
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if ((status = zw_query_object(
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href,
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OS_OBJECT_NAME_INFORMATION,
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path,
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buffer_size,
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&len)))
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return status;
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/* integrity */
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if (len == sizeof(struct pe_unicode_str))
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return OS_STATUS_BAD_FILE_TYPE;
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/* device root directory */
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root = path->buffer;
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wch = path->buffer + (path->strlen / sizeof(uint16_t));
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if ((root[0] != '\\')
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|| (root[1] != 'D') || (root[2] != 'e')
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|| (root[3] != 'v') || (root[4] != 'i')
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|| (root[5] != 'c') || (root[6] != 'e')
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|| (root[7] != '\\'))
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return OS_STATUS_INTERNAL_ERROR;
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for (root=&root[8]; (root
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root++;
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if ((uint16_t)((++root - path->buffer) * sizeof(uint16_t)) == path->strlen)
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return OS_STATUS_MORE_PROCESSING_REQUIRED;
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/* physical parent directory path */
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for (; (wch>root) && (wch[-1]!='\\'); )
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wch--;
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path->strlen = sizeof(uint16_t) * (uint16_t)(wch-path->buffer);
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path->maxlen = 0;
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/* oa */
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oa.len = sizeof(struct os_oa);
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oa.root_dir = 0;
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oa.obj_name = path;
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oa.obj_attr = oattr;
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oa.sec_desc = 0;
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oa.sec_qos = 0;
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/* default access */
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desired_access = desired_access
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? desired_access
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: OS_SEC_SYNCHRONIZE | OS_FILE_READ_ATTRIBUTES | OS_FILE_READ_ACCESS;
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/* open parent directory */
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return zw_open_file(
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hparent,
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desired_access,
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&oa,&iosb,
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share_access,
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open_options | OS_FILE_DIRECTORY_FILE);
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}
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