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/* $Id: fileioutils-nt.cpp $ */
/** @file
* IPRT - File I/O, common NT helpers.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/nt/nt.h>
#include "internal/iprt.h"
#include <iprt/errcore.h>
#include "internal/file.h"
/**
* Helper for converting RTFILE_O_XXX to the various NtCreateFile flags.
*
* @returns IPRT status code
* @param fOpen The RTFILE_O_XXX flags to convert.
* @param pfDesiredAccess Where to return the desired access mask.
* @param pfObjAttribs Where to return the NT object attributes.
* @param pfFileAttribs Where to return the file attributes (create).
* @param pfShareAccess Where to return the file sharing access mask.
* @param pfCreateDisposition Where to return the file create disposition.
* @param pfCreateOptions Where to return the file open/create options.
*/
DECLHIDDEN(int) rtFileNtValidateAndConvertFlags(uint64_t fOpen, uint32_t *pfDesiredAccess, uint32_t *pfObjAttribs,
uint32_t *pfFileAttribs, uint32_t *pfShareAccess, uint32_t *pfCreateDisposition,
uint32_t *pfCreateOptions)
{
/*
* Merge forced open flags and validate them.
*/
int rc = rtFileRecalcAndValidateFlags(&fOpen);
if (RT_FAILURE(rc))
return rc;
/*
* Determine disposition, access, share mode, creation flags, and security attributes
* for the CreateFile API call.
*/
ULONG fCreateDisposition;
switch (fOpen & RTFILE_O_ACTION_MASK)
{
case RTFILE_O_OPEN:
fCreateDisposition = fOpen & RTFILE_O_TRUNCATE ? FILE_OVERWRITE : FILE_OPEN;
break;
case RTFILE_O_OPEN_CREATE:
fCreateDisposition = FILE_OPEN_IF;
break;
case RTFILE_O_CREATE:
fCreateDisposition = FILE_CREATE;
break;
case RTFILE_O_CREATE_REPLACE:
fCreateDisposition = FILE_SUPERSEDE;
break;
default:
AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen));
return VERR_INVALID_PARAMETER;
}
ACCESS_MASK fDesiredAccess;
switch (fOpen & RTFILE_O_ACCESS_MASK)
{
case RTFILE_O_READ:
fDesiredAccess = FILE_GENERIC_READ; /* RTFILE_O_APPEND is ignored. */
break;
case RTFILE_O_WRITE:
fDesiredAccess = fOpen & RTFILE_O_APPEND
? FILE_GENERIC_WRITE & ~FILE_WRITE_DATA
: FILE_GENERIC_WRITE;
break;
case RTFILE_O_READWRITE:
fDesiredAccess = fOpen & RTFILE_O_APPEND
? FILE_GENERIC_READ | (FILE_GENERIC_WRITE & ~FILE_WRITE_DATA)
: FILE_GENERIC_READ | FILE_GENERIC_WRITE;
break;
case RTFILE_O_ATTR_ONLY:
if (fOpen & RTFILE_O_ACCESS_ATTR_MASK)
{
fDesiredAccess = 0;
break;
}
RT_FALL_THRU();
default:
AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen));
return VERR_INVALID_PARAMETER;
}
if (fCreateDisposition == FILE_OVERWRITE)
/* Required for truncating the file (see MSDN), it is *NOT* part of FILE_GENERIC_WRITE. */
fDesiredAccess |= GENERIC_WRITE;
/* RTFileSetMode needs following rights as well. */
switch (fOpen & RTFILE_O_ACCESS_ATTR_MASK)
{
case RTFILE_O_ACCESS_ATTR_READ: fDesiredAccess |= FILE_READ_ATTRIBUTES | SYNCHRONIZE; break;
case RTFILE_O_ACCESS_ATTR_WRITE: fDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
case RTFILE_O_ACCESS_ATTR_READWRITE: fDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
default:
/* Attributes access is the same as the file access. */
switch (fOpen & RTFILE_O_ACCESS_MASK)
{
case RTFILE_O_READ: fDesiredAccess |= FILE_READ_ATTRIBUTES | SYNCHRONIZE; break;
case RTFILE_O_WRITE: fDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
case RTFILE_O_READWRITE: fDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
default:
AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen));
return VERR_INVALID_PARAMETER;
}
}
ULONG fShareAccess;
switch (fOpen & RTFILE_O_DENY_MASK)
{
case RTFILE_O_DENY_NONE: fShareAccess = FILE_SHARE_READ | FILE_SHARE_WRITE; break;
case RTFILE_O_DENY_READ: fShareAccess = FILE_SHARE_WRITE; break;
case RTFILE_O_DENY_WRITE: fShareAccess = FILE_SHARE_READ; break;
case RTFILE_O_DENY_READWRITE: fShareAccess = 0; break;
case RTFILE_O_DENY_NOT_DELETE: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE; break;
case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READ: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_WRITE; break;
case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_WRITE: fShareAccess = FILE_SHARE_DELETE | FILE_SHARE_READ; break;
case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READWRITE:fShareAccess = FILE_SHARE_DELETE; break;
default:
AssertMsgFailed(("Impossible fOpen=%#llx\n", fOpen));
return VERR_INVALID_PARAMETER;
}
ULONG fObjAttribs = 0;
if (fOpen & RTFILE_O_INHERIT)
fObjAttribs = OBJ_INHERIT;
ULONG fCreateOptions = FILE_NON_DIRECTORY_FILE;
if (fOpen & RTFILE_O_WRITE_THROUGH)
fCreateOptions |= FILE_WRITE_THROUGH;
if (!(fOpen & RTFILE_O_ASYNC_IO))
fCreateOptions |= FILE_SYNCHRONOUS_IO_NONALERT;
if (fOpen & RTFILE_O_NO_CACHE)
{
fCreateOptions |= FILE_NO_INTERMEDIATE_BUFFERING;
fDesiredAccess &= ~FILE_APPEND_DATA;
}
/*
* Done.
*/
*pfDesiredAccess = fDesiredAccess;
*pfObjAttribs = fObjAttribs;
*pfFileAttribs = FILE_ATTRIBUTE_NORMAL;
*pfShareAccess = fShareAccess;
*pfCreateDisposition = fCreateDisposition;
*pfCreateOptions = fCreateOptions;
return VINF_SUCCESS;
}
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