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Diffstat (limited to 'src/VBox/Runtime/nt/fileioutils-nt.cpp')
| -rw-r--r-- | src/VBox/Runtime/nt/fileioutils-nt.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/VBox/Runtime/nt/fileioutils-nt.cpp b/src/VBox/Runtime/nt/fileioutils-nt.cpp new file mode 100644 index 00000000..43eb395f --- /dev/null +++ b/src/VBox/Runtime/nt/fileioutils-nt.cpp @@ -0,0 +1,179 @@ +/* $Id: fileioutils-nt.cpp $ */ +/** @file + * IPRT - File I/O, common NT helpers. + */ + +/* + * Copyright (C) 2006-2019 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; +} + |