Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1549 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/win/fileio-win.cpp b/src/VBox/Runtime/r3/win/fileio-win.cpp
new file mode 100644
index 00000000..3feba3a2
--- /dev/null
+++ b/src/VBox/Runtime/r3/win/fileio-win.cpp
@@ -0,0 +1,1549 @@
+/* $Id: fileio-win.cpp $ */
+/** @file
+ * IPRT - File I/O, native implementation for the Windows host platform.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_DIR
+#ifndef _WIN32_WINNT
+# define _WIN32_WINNT 0x0500
+#endif
+#include <iprt/nt/nt-and-windows.h>
+
+#include <iprt/file.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/path.h>
+#include <iprt/string.h>
+#include <iprt/err.h>
+#include <iprt/ldr.h>
+#include <iprt/log.h>
+#include <iprt/utf16.h>
+#include "internal/file.h"
+#include "internal/fs.h"
+#include "internal/path.h"
+#include "internal-r3-win.h" /* For g_enmWinVer + kRTWinOSType_XXX */
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+typedef BOOL WINAPI FNVERIFYCONSOLEIOHANDLE(HANDLE);
+typedef FNVERIFYCONSOLEIOHANDLE *PFNVERIFYCONSOLEIOHANDLE; /* No, nobody fell on the keyboard, really! */
+
+
+/**
+ * This is wrapper around the ugly SetFilePointer api.
+ *
+ * It's equivalent to SetFilePointerEx which we so unfortunately cannot use because of
+ * it not being present in NT4 GA.
+ *
+ * @returns Success indicator. Extended error information obtainable using GetLastError().
+ * @param   hFile       Filehandle.
+ * @param   offSeek     Offset to seek.
+ * @param   poffNew     Where to store the new file offset. NULL allowed.
+ * @param   uMethod     Seek method. (The windows one!)
+ */
+DECLINLINE(bool) MySetFilePointer(RTFILE hFile, uint64_t offSeek, uint64_t *poffNew, unsigned uMethod)
+{
+    bool            fRc;
+    LARGE_INTEGER   off;
+
+    off.QuadPart = offSeek;
+#if 1
+    if (off.LowPart != INVALID_SET_FILE_POINTER)
+    {
+        off.LowPart = SetFilePointer((HANDLE)RTFileToNative(hFile), off.LowPart, &off.HighPart, uMethod);
+        fRc = off.LowPart != INVALID_SET_FILE_POINTER;
+    }
+    else
+    {
+        SetLastError(NO_ERROR);
+        off.LowPart = SetFilePointer((HANDLE)RTFileToNative(hFile), off.LowPart, &off.HighPart, uMethod);
+        fRc = GetLastError() == NO_ERROR;
+    }
+#else
+    fRc = SetFilePointerEx((HANDLE)RTFileToNative(hFile), off, &off, uMethod);
+#endif
+    if (fRc && poffNew)
+        *poffNew = off.QuadPart;
+    return fRc;
+}
+
+
+/**
+ * Helper for checking if a VERR_DISK_FULL isn't a VERR_FILE_TOO_BIG.
+ * @returns VERR_DISK_FULL or VERR_FILE_TOO_BIG.
+ */
+static int rtFileWinCheckIfDiskReallyFull(RTFILE hFile, uint64_t cbDesired)
+{
+    /*
+     * Windows doesn't appear to have a way to query the file size limit of a
+     * file system, so we have to deduce the limit from the file system driver name.
+     * This means it will only work for known file systems.
+     */
+    if (cbDesired >= _2G - 1)
+    {
+        uint64_t cbMaxFile = UINT64_MAX;
+        RTFSTYPE enmFsType;
+        int rc = rtNtQueryFsType((HANDLE)RTFileToNative(hFile), &enmFsType);
+        if (RT_SUCCESS(rc))
+            switch (enmFsType)
+            {
+                case RTFSTYPE_NTFS:
+                case RTFSTYPE_EXFAT:
+                case RTFSTYPE_UDF:
+                    cbMaxFile = UINT64_C(0xffffffffffffffff); /* (May be limited by IFS.) */
+                    break;
+
+                case RTFSTYPE_ISO9660:
+                    cbMaxFile = 8 *_1T;
+                    break;
+
+                case RTFSTYPE_FAT:
+                    cbMaxFile = _4G;
+                    break;
+
+                case RTFSTYPE_HPFS:
+                    cbMaxFile = _2G;
+                    break;
+
+                default:
+                    break;
+            }
+        if (cbDesired >= cbMaxFile)
+            return VERR_FILE_TOO_BIG;
+    }
+    return VERR_DISK_FULL;
+}
+
+
+RTR3DECL(int) RTFileFromNative(PRTFILE pFile, RTHCINTPTR uNative)
+{
+    HANDLE h = (HANDLE)uNative;
+    AssertCompile(sizeof(h) == sizeof(uNative));
+    if (h == INVALID_HANDLE_VALUE)
+    {
+        AssertMsgFailed(("%p\n", uNative));
+        *pFile = NIL_RTFILE;
+        return VERR_INVALID_HANDLE;
+    }
+    *pFile = (RTFILE)h;
+    return VINF_SUCCESS;
+}
+
+
+RTR3DECL(RTHCINTPTR) RTFileToNative(RTFILE hFile)
+{
+    AssertReturn(hFile != NIL_RTFILE, (RTHCINTPTR)INVALID_HANDLE_VALUE);
+    return (RTHCINTPTR)hFile;
+}
+
+
+RTR3DECL(int) RTFileOpen(PRTFILE pFile, const char *pszFilename, uint64_t fOpen)
+{
+    return RTFileOpenEx(pszFilename, fOpen, pFile, NULL);
+}
+
+
+RTDECL(int) RTFileOpenEx(const char *pszFilename, uint64_t fOpen, PRTFILE phFile, PRTFILEACTION penmActionTaken)
+{
+    /*
+     * Validate input.
+     */
+    AssertReturn(phFile, VERR_INVALID_PARAMETER);
+    *phFile = NIL_RTFILE;
+    if (penmActionTaken)
+        *penmActionTaken = RTFILEACTION_INVALID;
+    AssertReturn(pszFilename, VERR_INVALID_PARAMETER);
+
+    /*
+     * 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.
+     */
+    DWORD dwCreationDisposition;
+    switch (fOpen & RTFILE_O_ACTION_MASK)
+    {
+        case RTFILE_O_OPEN:
+            dwCreationDisposition = fOpen & RTFILE_O_TRUNCATE ? TRUNCATE_EXISTING : OPEN_EXISTING;
+            break;
+        case RTFILE_O_OPEN_CREATE:
+            dwCreationDisposition = OPEN_ALWAYS;
+            break;
+        case RTFILE_O_CREATE:
+            dwCreationDisposition = CREATE_NEW;
+            break;
+        case RTFILE_O_CREATE_REPLACE:
+            dwCreationDisposition = CREATE_ALWAYS;
+            break;
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+
+    DWORD dwDesiredAccess;
+    switch (fOpen & RTFILE_O_ACCESS_MASK)
+    {
+        case RTFILE_O_READ:
+            dwDesiredAccess = FILE_GENERIC_READ; /* RTFILE_O_APPEND is ignored. */
+            break;
+        case RTFILE_O_WRITE:
+            dwDesiredAccess = fOpen & RTFILE_O_APPEND
+                            ? FILE_GENERIC_WRITE & ~FILE_WRITE_DATA
+                            : FILE_GENERIC_WRITE;
+            break;
+        case RTFILE_O_READWRITE:
+            dwDesiredAccess = 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)
+            {
+                dwDesiredAccess = 0;
+                break;
+            }
+            RT_FALL_THRU();
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+    if (dwCreationDisposition == TRUNCATE_EXISTING)
+        /* Required for truncating the file (see MSDN), it is *NOT* part of FILE_GENERIC_WRITE. */
+        dwDesiredAccess |= GENERIC_WRITE;
+
+    /* RTFileSetMode needs following rights as well. */
+    switch (fOpen & RTFILE_O_ACCESS_ATTR_MASK)
+    {
+        case RTFILE_O_ACCESS_ATTR_READ:      dwDesiredAccess |= FILE_READ_ATTRIBUTES  | SYNCHRONIZE; break;
+        case RTFILE_O_ACCESS_ATTR_WRITE:     dwDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+        case RTFILE_O_ACCESS_ATTR_READWRITE: dwDesiredAccess |= 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:          dwDesiredAccess |= FILE_READ_ATTRIBUTES  | SYNCHRONIZE; break;
+                case RTFILE_O_WRITE:         dwDesiredAccess |= FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+                case RTFILE_O_READWRITE:     dwDesiredAccess |= FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES | SYNCHRONIZE; break;
+                default:
+                    AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+            }
+    }
+
+    DWORD dwShareMode;
+    switch (fOpen & RTFILE_O_DENY_MASK)
+    {
+        case RTFILE_O_DENY_NONE:                                dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_READ:                                dwShareMode = FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_WRITE:                               dwShareMode = FILE_SHARE_READ; break;
+        case RTFILE_O_DENY_READWRITE:                           dwShareMode = 0; break;
+
+        case RTFILE_O_DENY_NOT_DELETE:                          dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READ:     dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_WRITE; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_WRITE:    dwShareMode = FILE_SHARE_DELETE | FILE_SHARE_READ; break;
+        case RTFILE_O_DENY_NOT_DELETE | RTFILE_O_DENY_READWRITE:dwShareMode = FILE_SHARE_DELETE; break;
+        default:
+            AssertMsgFailedReturn(("Impossible fOpen=%#llx\n", fOpen), VERR_INVALID_FLAGS);
+    }
+
+    SECURITY_ATTRIBUTES  SecurityAttributes;
+    PSECURITY_ATTRIBUTES pSecurityAttributes = NULL;
+    if (fOpen & RTFILE_O_INHERIT)
+    {
+        SecurityAttributes.nLength              = sizeof(SecurityAttributes);
+        SecurityAttributes.lpSecurityDescriptor = NULL;
+        SecurityAttributes.bInheritHandle       = TRUE;
+        pSecurityAttributes = &SecurityAttributes;
+    }
+
+    DWORD dwFlagsAndAttributes;
+    dwFlagsAndAttributes = !(fOpen & RTFILE_O_TEMP_AUTO_DELETE) ? FILE_ATTRIBUTE_NORMAL : FILE_ATTRIBUTE_TEMPORARY;
+    if (fOpen & RTFILE_O_TEMP_AUTO_DELETE)
+        fOpen |= FILE_FLAG_DELETE_ON_CLOSE;
+    if (fOpen & RTFILE_O_WRITE_THROUGH)
+        dwFlagsAndAttributes |= FILE_FLAG_WRITE_THROUGH;
+    if (fOpen & RTFILE_O_ASYNC_IO)
+        dwFlagsAndAttributes |= FILE_FLAG_OVERLAPPED;
+    if (fOpen & RTFILE_O_NO_CACHE)
+    {
+        dwFlagsAndAttributes |= FILE_FLAG_NO_BUFFERING;
+        dwDesiredAccess &= ~FILE_APPEND_DATA;
+    }
+
+    /*
+     * Open/Create the file.
+     */
+    PRTUTF16 pwszFilename;
+    rc = RTPathWinFromUtf8(&pwszFilename, pszFilename, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        HANDLE hFile = CreateFileW(pwszFilename,
+                                   dwDesiredAccess,
+                                   dwShareMode,
+                                   pSecurityAttributes,
+                                   dwCreationDisposition,
+                                   dwFlagsAndAttributes,
+                                   NULL);
+        DWORD const dwErr = GetLastError();
+        if (hFile != INVALID_HANDLE_VALUE)
+        {
+            /*
+             * Calculate the action taken value.
+             */
+            RTFILEACTION enmActionTaken;
+            switch (dwCreationDisposition)
+            {
+                case CREATE_NEW:
+                    enmActionTaken = RTFILEACTION_CREATED;
+                    break;
+                case CREATE_ALWAYS:
+                    AssertMsg(dwErr == ERROR_ALREADY_EXISTS || dwErr == NO_ERROR, ("%u\n", dwErr));
+                    enmActionTaken = dwErr == ERROR_ALREADY_EXISTS ? RTFILEACTION_REPLACED : RTFILEACTION_CREATED;
+                    break;
+                case OPEN_EXISTING:
+                    enmActionTaken = RTFILEACTION_OPENED;
+                    break;
+                case OPEN_ALWAYS:
+                    AssertMsg(dwErr == ERROR_ALREADY_EXISTS || dwErr == NO_ERROR, ("%u\n", dwErr));
+                    enmActionTaken = dwErr == ERROR_ALREADY_EXISTS ? RTFILEACTION_OPENED : RTFILEACTION_CREATED;
+                    break;
+                case TRUNCATE_EXISTING:
+                    enmActionTaken = RTFILEACTION_TRUNCATED;
+                    break;
+                default:
+                    AssertMsgFailed(("%d %#x\n", dwCreationDisposition, dwCreationDisposition));
+                    enmActionTaken = RTFILEACTION_INVALID;
+                    break;
+            }
+
+            /*
+             * Turn off indexing of directory through Windows Indexing Service if
+             * we created a new file or replaced an existing one.
+             */
+            if (   (fOpen & RTFILE_O_NOT_CONTENT_INDEXED)
+                && (   enmActionTaken == RTFILEACTION_CREATED
+                    || enmActionTaken == RTFILEACTION_REPLACED) )
+            {
+                /** @todo there must be a way to do this via the handle! */
+                if (!SetFileAttributesW(pwszFilename, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED))
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            /*
+             * If RTFILEACTION_OPENED, we may need to truncate the file.
+             */
+            else if (  (fOpen & (RTFILE_O_TRUNCATE | RTFILE_O_ACTION_MASK)) == (RTFILE_O_TRUNCATE | RTFILE_O_OPEN_CREATE)
+                     && enmActionTaken == RTFILEACTION_OPENED)
+            {
+                if (SetEndOfFile(hFile))
+                    enmActionTaken = RTFILEACTION_TRUNCATED;
+                else
+                    rc = RTErrConvertFromWin32(GetLastError());
+            }
+            if (penmActionTaken)
+                *penmActionTaken = enmActionTaken;
+            if (RT_SUCCESS(rc))
+            {
+                *phFile = (RTFILE)hFile;
+                Assert((HANDLE)*phFile == hFile);
+                RTPathWinFree(pwszFilename);
+                return VINF_SUCCESS;
+            }
+
+            CloseHandle(hFile);
+        }
+        else
+        {
+            if (   penmActionTaken
+                && dwCreationDisposition == CREATE_NEW
+                && dwErr == ERROR_FILE_EXISTS)
+                *penmActionTaken = RTFILEACTION_ALREADY_EXISTS;
+            rc = RTErrConvertFromWin32(dwErr);
+        }
+        RTPathWinFree(pwszFilename);
+    }
+    return rc;
+}
+
+
+RTR3DECL(int)  RTFileOpenBitBucket(PRTFILE phFile, uint64_t fAccess)
+{
+    AssertReturn(   fAccess == RTFILE_O_READ
+                 || fAccess == RTFILE_O_WRITE
+                 || fAccess == RTFILE_O_READWRITE,
+                 VERR_INVALID_PARAMETER);
+    return RTFileOpen(phFile, "NUL", fAccess | RTFILE_O_DENY_NONE | RTFILE_O_OPEN);
+}
+
+
+RTDECL(int)  RTFileDup(RTFILE hFileSrc, uint64_t fFlags, PRTFILE phFileNew)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(phFileNew, VERR_INVALID_POINTER);
+    *phFileNew = NIL_RTFILE;
+    AssertPtrReturn(phFileNew, VERR_INVALID_POINTER);
+    AssertReturn(!(fFlags & ~(uint64_t)RTFILE_O_INHERIT), VERR_INVALID_FLAGS);
+
+    /*
+     * Do the job.
+     */
+    HANDLE hNew = INVALID_HANDLE_VALUE;
+    if (DuplicateHandle(GetCurrentProcess(), (HANDLE)RTFileToNative(hFileSrc),
+                        GetCurrentProcess(), &hNew, 0, RT_BOOL(fFlags & RTFILE_O_INHERIT), DUPLICATE_SAME_ACCESS))
+    {
+        *phFileNew = (RTFILE)hNew;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int)  RTFileClose(RTFILE hFile)
+{
+    if (hFile == NIL_RTFILE)
+        return VINF_SUCCESS;
+    if (CloseHandle((HANDLE)RTFileToNative(hFile)))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTFILE rtFileGetStandard(RTHANDLESTD enmStdHandle)
+{
+    DWORD dwStdHandle;
+    switch (enmStdHandle)
+    {
+        case RTHANDLESTD_INPUT:     dwStdHandle = STD_INPUT_HANDLE;  break;
+        case RTHANDLESTD_OUTPUT:    dwStdHandle = STD_OUTPUT_HANDLE; break;
+        case RTHANDLESTD_ERROR:     dwStdHandle = STD_ERROR_HANDLE;  break;
+        default:
+            AssertFailedReturn(NIL_RTFILE);
+    }
+
+    HANDLE hNative = GetStdHandle(dwStdHandle);
+    if (hNative == INVALID_HANDLE_VALUE)
+        return NIL_RTFILE;
+
+    RTFILE hFile = (RTFILE)(uintptr_t)hNative;
+    AssertReturn((HANDLE)(uintptr_t)hFile == hNative, NIL_RTFILE);
+    return hFile;
+}
+
+
+RTR3DECL(int)  RTFileSeek(RTFILE hFile, int64_t offSeek, unsigned uMethod, uint64_t *poffActual)
+{
+    static ULONG aulSeekRecode[] =
+    {
+        FILE_BEGIN,
+        FILE_CURRENT,
+        FILE_END,
+    };
+
+    /*
+     * Validate input.
+     */
+    if (uMethod > RTFILE_SEEK_END)
+    {
+        AssertMsgFailed(("Invalid uMethod=%d\n", uMethod));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Execute the seek.
+     */
+    if (MySetFilePointer(hFile, offSeek, poffActual, aulSeekRecode[uMethod]))
+        return VINF_SUCCESS;
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int)  RTFileRead(RTFILE hFile, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    if (cbToRead <= 0)
+    {
+        if (pcbRead)
+            *pcbRead = 0;
+        return VINF_SUCCESS;
+    }
+    ULONG cbToReadAdj = (ULONG)cbToRead;
+    AssertReturn(cbToReadAdj == cbToRead, VERR_NUMBER_TOO_BIG);
+
+    ULONG cbRead = 0;
+    if (ReadFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToReadAdj, &cbRead, NULL))
+    {
+        if (pcbRead)
+            /* Caller can handle partial reads. */
+            *pcbRead = cbRead;
+        else
+        {
+            /* Caller expects everything to be read. */
+            while (cbToReadAdj > cbRead)
+            {
+                ULONG cbReadPart = 0;
+                if (!ReadFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToReadAdj - cbRead, &cbReadPart, NULL))
+                    return RTErrConvertFromWin32(GetLastError());
+                if (cbReadPart == 0)
+                    return VERR_EOF;
+                cbRead += cbReadPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * If it's a console, we might bump into out of memory conditions in the
+     * ReadConsole call.
+     */
+    DWORD dwErr = GetLastError();
+    if (dwErr == ERROR_NOT_ENOUGH_MEMORY)
+    {
+        ULONG cbChunk = cbToReadAdj / 2;
+        if (cbChunk > 16*_1K)
+            cbChunk = 16*_1K;
+        else
+            cbChunk = RT_ALIGN_32(cbChunk, 256);
+
+        cbRead = 0;
+        while (cbToReadAdj > cbRead)
+        {
+            ULONG cbToReadNow = RT_MIN(cbChunk, cbToReadAdj - cbRead);
+            ULONG cbReadPart  = 0;
+            if (!ReadFile((HANDLE)RTFileToNative(hFile), (char *)pvBuf + cbRead, cbToReadNow, &cbReadPart, NULL))
+            {
+                /* If we failed because the buffer is too big, shrink it and
+                   try again. */
+                dwErr = GetLastError();
+                if (   dwErr == ERROR_NOT_ENOUGH_MEMORY
+                    && cbChunk > 8)
+                {
+                    cbChunk /= 2;
+                    continue;
+                }
+                return RTErrConvertFromWin32(dwErr);
+            }
+            cbRead += cbReadPart;
+
+            /* Return if the caller can handle partial reads, otherwise try
+               fill the buffer all the way up. */
+            if (pcbRead)
+            {
+                *pcbRead = cbRead;
+                break;
+            }
+            if (cbReadPart == 0)
+                return VERR_EOF;
+        }
+        return VINF_SUCCESS;
+    }
+
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTDECL(int)  RTFileReadAt(RTFILE hFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
+{
+    ULONG cbToReadAdj = (ULONG)cbToRead;
+    AssertReturn(cbToReadAdj == cbToRead, VERR_NUMBER_TOO_BIG);
+
+    OVERLAPPED Overlapped;
+    Overlapped.Offset       = (uint32_t)off;
+    Overlapped.OffsetHigh   = (uint32_t)(off >> 32);
+    Overlapped.hEvent       = NULL;
+    Overlapped.Internal     = 0;
+    Overlapped.InternalHigh = 0;
+
+    ULONG cbRead = 0;
+    if (ReadFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToReadAdj, &cbRead, &Overlapped))
+    {
+        if (pcbRead)
+            /* Caller can handle partial reads. */
+            *pcbRead = cbRead;
+        else
+        {
+            /* Caller expects everything to be read. */
+            while (cbToReadAdj > cbRead)
+            {
+                Overlapped.Offset       = (uint32_t)(off + cbRead);
+                Overlapped.OffsetHigh   = (uint32_t)((off + cbRead) >> 32);
+                Overlapped.hEvent       = NULL;
+                Overlapped.Internal     = 0;
+                Overlapped.InternalHigh = 0;
+
+                ULONG cbReadPart = 0;
+                if (!ReadFile((HANDLE)RTFileToNative(hFile), (char *)pvBuf + cbRead, cbToReadAdj - cbRead,
+                              &cbReadPart, &Overlapped))
+                    return RTErrConvertFromWin32(GetLastError());
+                if (cbReadPart == 0)
+                    return VERR_EOF;
+                cbRead += cbReadPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /* We will get an EOF error when using overlapped I/O.  So, make sure we don't
+       return it when pcbhRead is not NULL. */
+    DWORD dwErr = GetLastError();
+    if (pcbRead && dwErr == ERROR_HANDLE_EOF)
+    {
+        *pcbRead = 0;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromWin32(dwErr);
+}
+
+
+RTR3DECL(int)  RTFileWrite(RTFILE hFile, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    if (cbToWrite <= 0)
+        return VINF_SUCCESS;
+    ULONG const cbToWriteAdj = (ULONG)cbToWrite;
+    AssertReturn(cbToWriteAdj == cbToWrite, VERR_NUMBER_TOO_BIG);
+
+    ULONG cbWritten = 0;
+    if (WriteFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToWriteAdj, &cbWritten, NULL))
+    {
+        if (pcbWritten)
+            /* Caller can handle partial writes. */
+            *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+        else
+        {
+            /* Caller expects everything to be written. */
+            while (cbWritten < cbToWriteAdj)
+            {
+                ULONG cbWrittenPart = 0;
+                if (!WriteFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbWritten,
+                               cbToWriteAdj - cbWritten, &cbWrittenPart, NULL))
+                {
+                    int rc = RTErrConvertFromWin32(GetLastError());
+                    if (rc == VERR_DISK_FULL)
+                        rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWriteAdj - cbWritten);
+                    return rc;
+                }
+                if (cbWrittenPart == 0)
+                    return VERR_WRITE_ERROR;
+                cbWritten += cbWrittenPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * If it's a console, we might bump into out of memory conditions in the
+     * WriteConsole call.
+     */
+    DWORD dwErr = GetLastError();
+    if (dwErr == ERROR_NOT_ENOUGH_MEMORY)
+    {
+        ULONG cbChunk = cbToWriteAdj / 2;
+        if (cbChunk > _32K)
+            cbChunk = _32K;
+        else
+            cbChunk = RT_ALIGN_32(cbChunk, 256);
+
+        cbWritten = 0;
+        while (cbWritten < cbToWriteAdj)
+        {
+            ULONG cbToWriteNow  = RT_MIN(cbChunk, cbToWriteAdj - cbWritten);
+            ULONG cbWrittenPart = 0;
+            if (!WriteFile((HANDLE)RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWriteNow, &cbWrittenPart, NULL))
+            {
+                /* If we failed because the buffer is too big, shrink it and
+                   try again. */
+                dwErr = GetLastError();
+                if (   dwErr == ERROR_NOT_ENOUGH_MEMORY
+                    && cbChunk > 8)
+                {
+                    cbChunk /= 2;
+                    continue;
+                }
+                int rc = RTErrConvertFromWin32(dwErr);
+                if (rc == VERR_DISK_FULL)
+                    rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWriteNow);
+                return rc;
+            }
+            cbWritten += cbWrittenPart;
+
+            /* Return if the caller can handle partial writes, otherwise try
+               write out everything. */
+            if (pcbWritten)
+            {
+                *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+                break;
+            }
+            if (cbWrittenPart == 0)
+                return VERR_WRITE_ERROR;
+        }
+        return VINF_SUCCESS;
+    }
+
+    int rc = RTErrConvertFromWin32(dwErr);
+    if (rc == VERR_DISK_FULL)
+        rc = rtFileWinCheckIfDiskReallyFull(hFile, RTFileTell(hFile) + cbToWriteAdj);
+    return rc;
+}
+
+
+RTDECL(int)  RTFileWriteAt(RTFILE hFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
+{
+    ULONG const cbToWriteAdj = (ULONG)cbToWrite;
+    AssertReturn(cbToWriteAdj == cbToWrite, VERR_NUMBER_TOO_BIG);
+
+    OVERLAPPED Overlapped;
+    Overlapped.Offset       = (uint32_t)off;
+    Overlapped.OffsetHigh   = (uint32_t)(off >> 32);
+    Overlapped.hEvent       = NULL;
+    Overlapped.Internal     = 0;
+    Overlapped.InternalHigh = 0;
+
+    ULONG cbWritten = 0;
+    if (WriteFile((HANDLE)RTFileToNative(hFile), pvBuf, cbToWriteAdj, &cbWritten, &Overlapped))
+    {
+        if (pcbWritten)
+            /* Caller can handle partial writes. */
+            *pcbWritten = RT_MIN(cbWritten, cbToWriteAdj); /* paranoia^3 */
+        else
+        {
+            /* Caller expects everything to be written. */
+            while (cbWritten < cbToWriteAdj)
+            {
+                Overlapped.Offset       = (uint32_t)(off + cbWritten);
+                Overlapped.OffsetHigh   = (uint32_t)((off + cbWritten) >> 32);
+                Overlapped.hEvent       = NULL;
+                Overlapped.Internal     = 0;
+                Overlapped.InternalHigh = 0;
+
+                ULONG cbWrittenPart = 0;
+                if (!WriteFile((HANDLE)RTFileToNative(hFile), (char*)pvBuf + cbWritten,
+                               cbToWriteAdj - cbWritten, &cbWrittenPart, &Overlapped))
+                {
+                    int rc = RTErrConvertFromWin32(GetLastError());
+                    if (rc == VERR_DISK_FULL)
+                        rc = rtFileWinCheckIfDiskReallyFull(hFile, off + cbToWriteAdj);
+                    return rc;
+                }
+                if (cbWrittenPart == 0)
+                    return VERR_WRITE_ERROR;
+                cbWritten += cbWrittenPart;
+            }
+        }
+        return VINF_SUCCESS;
+    }
+
+    int rc = RTErrConvertFromWin32(GetLastError());
+    if (rc == VERR_DISK_FULL)
+        rc = rtFileWinCheckIfDiskReallyFull(hFile, off + cbToWriteAdj);
+    return rc;
+}
+
+
+RTR3DECL(int)  RTFileFlush(RTFILE hFile)
+{
+    if (!FlushFileBuffers((HANDLE)RTFileToNative(hFile)))
+    {
+        int rc = GetLastError();
+        Log(("FlushFileBuffers failed with %d\n", rc));
+        return RTErrConvertFromWin32(rc);
+    }
+    return VINF_SUCCESS;
+}
+
+#if 1
+
+/**
+ * Checks the the two handles refers to the same file.
+ *
+ * @returns true if the same file, false if different ones or invalid handles.
+ * @param   hFile1              Handle \#1.
+ * @param   hFile2              Handle \#2.
+ */
+static bool rtFileIsSame(HANDLE hFile1, HANDLE hFile2)
+{
+    /*
+     * We retry in case CreationTime or the Object ID is being modified and there
+     * aren't any IndexNumber (file ID) on this kind of file system.
+     */
+    for (uint32_t iTries = 0; iTries < 3; iTries++)
+    {
+        /*
+         * Fetch data to compare (being a little lazy here).
+         */
+        struct
+        {
+            HANDLE                      hFile;
+            NTSTATUS                    rcObjId;
+            FILE_OBJECTID_INFORMATION   ObjId;
+            FILE_ALL_INFORMATION        All;
+            FILE_FS_VOLUME_INFORMATION  Vol;
+        } auData[2];
+        auData[0].hFile = hFile1;
+        auData[1].hFile = hFile2;
+
+        for (uintptr_t i = 0; i < RT_ELEMENTS(auData); i++)
+        {
+            RT_ZERO(auData[i].ObjId);
+            IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+            auData[i].rcObjId = NtQueryInformationFile(auData[i].hFile, &Ios, &auData[i].ObjId, sizeof(auData[i].ObjId),
+                                                       FileObjectIdInformation);
+
+            RT_ZERO(auData[i].All);
+            RTNT_IO_STATUS_BLOCK_REINIT(&Ios);
+            NTSTATUS rcNt = NtQueryInformationFile(auData[i].hFile, &Ios, &auData[i].All, sizeof(auData[i].All),
+                                                   FileAllInformation);
+            AssertReturn(rcNt == STATUS_BUFFER_OVERFLOW /* insufficient space for name info */ || NT_SUCCESS(rcNt), false);
+
+            union
+            {
+                 FILE_FS_VOLUME_INFORMATION Info;
+                 uint8_t                    abBuf[sizeof(FILE_FS_VOLUME_INFORMATION) + 4096];
+            } uVol;
+            RT_ZERO(uVol.Info);
+            RTNT_IO_STATUS_BLOCK_REINIT(&Ios);
+            rcNt = NtQueryVolumeInformationFile(auData[i].hFile, &Ios, &uVol, sizeof(uVol), FileFsVolumeInformation);
+            if (NT_SUCCESS(rcNt))
+                auData[i].Vol = uVol.Info;
+            else
+                RT_ZERO(auData[i].Vol);
+        }
+
+        /*
+         * Compare it.
+         */
+        if (   auData[0].All.StandardInformation.Directory
+            == auData[1].All.StandardInformation.Directory)
+        { /* likely */ }
+        else
+            break;
+
+        if (   (auData[0].All.BasicInformation.FileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_REPARSE_POINT))
+            == (auData[1].All.BasicInformation.FileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_DEVICE | FILE_ATTRIBUTE_REPARSE_POINT)))
+        { /* likely */ }
+        else
+            break;
+
+        if (   auData[0].Vol.VolumeSerialNumber
+            == auData[1].Vol.VolumeSerialNumber)
+        { /* likely */ }
+        else
+            break;
+
+        if (   auData[0].All.InternalInformation.IndexNumber.QuadPart
+            == auData[1].All.InternalInformation.IndexNumber.QuadPart)
+        { /* likely */ }
+        else
+            break;
+
+        if (   !NT_SUCCESS(auData[0].rcObjId)
+            || memcmp(&auData[0].ObjId, &auData[1].ObjId, RT_UOFFSETOF(FILE_OBJECTID_INFORMATION, ExtendedInfo)) == 0)
+        {
+            if (   auData[0].All.BasicInformation.CreationTime.QuadPart
+                == auData[1].All.BasicInformation.CreationTime.QuadPart)
+                return true;
+        }
+    }
+
+    return false;
+}
+
+
+/**
+ * If @a hFile is opened in append mode, try return a handle with
+ * FILE_WRITE_DATA permissions.
+ *
+ * @returns Duplicate handle.
+ * @param   hFile               The NT handle to check & duplicate.
+ *
+ * @todo    It would be much easier to implement this by not dropping the
+ *          FILE_WRITE_DATA access and instead have the RTFileWrite APIs
+ *          enforce the appending.  That will require keeping additional
+ *          information along side the handle (instance structure).  However, on
+ *          windows you can grant append permissions w/o giving people access to
+ *          overwrite existing data, so the RTFileOpenEx code would have to deal
+ *          with those kinds of STATUS_ACCESS_DENIED too then.
+ */
+static HANDLE rtFileReOpenAppendOnlyWithFullWriteAccess(HANDLE hFile)
+{
+    OBJECT_BASIC_INFORMATION BasicInfo = {0};
+    ULONG                    cbActual  = 0;
+    NTSTATUS rcNt = NtQueryObject(hFile, ObjectBasicInformation, &BasicInfo, sizeof(BasicInfo), &cbActual);
+    if (NT_SUCCESS(rcNt))
+    {
+        if ((BasicInfo.GrantedAccess & (FILE_APPEND_DATA | FILE_WRITE_DATA)) == FILE_APPEND_DATA)
+        {
+            /*
+             * We cannot use NtDuplicateObject here as it is not possible to
+             * upgrade the access on files, only making it more strict.  So,
+             * query the path and re-open it (we could do by file/object/whatever
+             * id too, but that may not work with all file systems).
+             */
+            for (uint32_t i = 0; i < 16; i++)
+            {
+                UNICODE_STRING  NtName;
+                int rc = RTNtPathFromHandle(&NtName, hFile, 0);
+                AssertRCReturn(rc, INVALID_HANDLE_VALUE);
+
+                HANDLE              hDupFile = RTNT_INVALID_HANDLE_VALUE;
+                IO_STATUS_BLOCK     Ios      = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+                OBJECT_ATTRIBUTES   ObjAttr;
+                InitializeObjectAttributes(&ObjAttr, &NtName, BasicInfo.Attributes & ~OBJ_INHERIT, NULL, NULL);
+
+                rcNt = NtCreateFile(&hDupFile,
+                                    BasicInfo.GrantedAccess | FILE_WRITE_DATA,
+                                    &ObjAttr,
+                                    &Ios,
+                                    NULL /* AllocationSize*/,
+                                    FILE_ATTRIBUTE_NORMAL,
+                                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                    FILE_OPEN,
+                                    FILE_OPEN_FOR_BACKUP_INTENT /*??*/,
+                                    NULL /*EaBuffer*/,
+                                    0 /*EaLength*/);
+                RTUtf16Free(NtName.Buffer);
+                if (NT_SUCCESS(rcNt))
+                {
+                    /*
+                     * Check that we've opened the same file.
+                     */
+                    if (rtFileIsSame(hFile, hDupFile))
+                        return hDupFile;
+                    NtClose(hDupFile);
+                }
+            }
+            AssertFailed();
+        }
+    }
+    return INVALID_HANDLE_VALUE;
+}
+
+#endif
+
+RTR3DECL(int) RTFileSetSize(RTFILE hFile, uint64_t cbSize)
+{
+#if 1
+    HANDLE hNtFile  = (HANDLE)RTFileToNative(hFile);
+    HANDLE hDupFile = INVALID_HANDLE_VALUE;
+    union
+    {
+        FILE_END_OF_FILE_INFORMATION Eof;
+        FILE_ALLOCATION_INFORMATION  Alloc;
+    } uInfo;
+
+    /*
+     * Change the EOF marker.
+     *
+     * HACK ALERT! If the file was opened in RTFILE_O_APPEND mode, we will have
+     *             to re-open it with FILE_WRITE_DATA access to get the job done.
+     *             This how ftruncate on a unixy system would work but not how
+     *             it is done on Windows where appending is a separate permission
+     *             rather than just a write modifier, making this hack totally wrong.
+     */
+    /** @todo The right way to fix this is either to add a RTFileSetSizeEx function
+     *        for specifically requesting the unixy behaviour, or add an additional
+     *        flag to RTFileOpen[Ex] to request the unixy append behaviour there.
+     *        The latter would require saving the open flags in a instance data
+     *        structure, which is a bit of a risky move, though something we should
+     *        do in 6.2 (or later).
+     *
+     *        Note! Because handle interitance, it is not realyan option to
+     *              always use FILE_WRITE_DATA and implement the RTFILE_O_APPEND
+     *              bits in RTFileWrite and friends.  Besides, it's not like
+     *              RTFILE_O_APPEND is so clearly defined anyway - see
+     *              RTFileWriteAt.
+     */
+    IO_STATUS_BLOCK Ios = RTNT_IO_STATUS_BLOCK_INITIALIZER;
+    uInfo.Eof.EndOfFile.QuadPart = cbSize;
+    NTSTATUS rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Eof), FileEndOfFileInformation);
+    if (rcNt == STATUS_ACCESS_DENIED)
+    {
+        hDupFile = rtFileReOpenAppendOnlyWithFullWriteAccess(hNtFile);
+        if (hDupFile != INVALID_HANDLE_VALUE)
+        {
+            hNtFile = hDupFile;
+            uInfo.Eof.EndOfFile.QuadPart = cbSize;
+            rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Eof), FileEndOfFileInformation);
+        }
+    }
+
+    if (NT_SUCCESS(rcNt))
+    {
+        /*
+         * Change the allocation.
+         */
+        uInfo.Alloc.AllocationSize.QuadPart = cbSize;
+        rcNt = NtSetInformationFile(hNtFile, &Ios, &uInfo.Eof, sizeof(uInfo.Alloc), FileAllocationInformation);
+    }
+
+    /*
+     * Close the temporary file handle:
+     */
+    if (hDupFile != INVALID_HANDLE_VALUE)
+        NtClose(hDupFile);
+
+    if (RT_SUCCESS(rcNt))
+        return VINF_SUCCESS;
+    return RTErrConvertFromNtStatus(rcNt);
+
+#else /* this version of the code will fail to truncate files when RTFILE_O_APPEND is in effect, which isn't what we want... */
+    /*
+     * Get current file pointer.
+     */
+    int         rc;
+    uint64_t    offCurrent;
+    if (MySetFilePointer(hFile, 0, &offCurrent, FILE_CURRENT))
+    {
+        /*
+         * Set new file pointer.
+         */
+        if (MySetFilePointer(hFile, cbSize, NULL, FILE_BEGIN))
+        {
+            /* set file pointer */
+            if (SetEndOfFile((HANDLE)RTFileToNative(hFile)))
+            {
+                /*
+                 * Restore file pointer and return.
+                 * If the old pointer was beyond the new file end, ignore failure.
+                 */
+                if (    MySetFilePointer(hFile, offCurrent, NULL, FILE_BEGIN)
+                    ||  offCurrent > cbSize)
+                    return VINF_SUCCESS;
+            }
+
+            /*
+             * Failed, try restoring the file pointer.
+             */
+            rc = GetLastError();
+            MySetFilePointer(hFile, offCurrent, NULL, FILE_BEGIN);
+
+            if (rc == ERROR_DISK_FULL)
+                return rtFileWinCheckIfDiskReallyFull(hFile, cbSize);
+        }
+        else
+            rc = GetLastError();
+    }
+    else
+        rc = GetLastError();
+
+    return RTErrConvertFromWin32(rc);
+#endif
+}
+
+
+RTR3DECL(int)  RTFileQuerySize(RTFILE hFile, uint64_t *pcbSize)
+{
+    /*
+     * GetFileSize works for most handles.
+     */
+    ULARGE_INTEGER  Size;
+    Size.LowPart = GetFileSize((HANDLE)RTFileToNative(hFile), &Size.HighPart);
+    if (Size.LowPart != INVALID_FILE_SIZE)
+    {
+        *pcbSize = Size.QuadPart;
+        return VINF_SUCCESS;
+    }
+    int rc = RTErrConvertFromWin32(GetLastError());
+
+    /*
+     * Could it be a volume or a disk?
+     */
+    DISK_GEOMETRY   DriveGeo;
+    DWORD           cbDriveGeo;
+    if (DeviceIoControl((HANDLE)RTFileToNative(hFile),
+                        IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
+                        &DriveGeo, sizeof(DriveGeo), &cbDriveGeo, NULL))
+    {
+        if (   DriveGeo.MediaType == FixedMedia
+            || DriveGeo.MediaType == RemovableMedia)
+        {
+            *pcbSize = DriveGeo.Cylinders.QuadPart
+                     * DriveGeo.TracksPerCylinder
+                     * DriveGeo.SectorsPerTrack
+                     * DriveGeo.BytesPerSector;
+
+            GET_LENGTH_INFORMATION  DiskLenInfo;
+            DWORD                   Ignored;
+            if (DeviceIoControl((HANDLE)RTFileToNative(hFile),
+                                IOCTL_DISK_GET_LENGTH_INFO, NULL, 0,
+                                &DiskLenInfo, sizeof(DiskLenInfo), &Ignored, (LPOVERLAPPED)NULL))
+            {
+                /* IOCTL_DISK_GET_LENGTH_INFO is supported -- override cbSize. */
+                *pcbSize = DiskLenInfo.Length.QuadPart;
+            }
+            return VINF_SUCCESS;
+        }
+    }
+
+    /*
+     * Return the GetFileSize result if not a volume/disk.
+     */
+    return rc;
+}
+
+
+RTR3DECL(int) RTFileQueryMaxSizeEx(RTFILE hFile, PRTFOFF pcbMax)
+{
+    /** @todo r=bird:
+     * We might have to make this code OS version specific... In the worse
+     * case, we'll have to try GetVolumeInformationByHandle on vista and fall
+     * back on NtQueryVolumeInformationFile(,,,, FileFsAttributeInformation)
+     * else where, and check for known file system names. (For LAN shares we'll
+     * have to figure out the remote file system.) */
+    RT_NOREF_PV(hFile); RT_NOREF_PV(pcbMax);
+    return VERR_NOT_IMPLEMENTED;
+}
+
+
+RTR3DECL(bool) RTFileIsValid(RTFILE hFile)
+{
+    if (hFile != NIL_RTFILE)
+    {
+        DWORD dwType = GetFileType((HANDLE)RTFileToNative(hFile));
+        switch (dwType)
+        {
+            case FILE_TYPE_CHAR:
+            case FILE_TYPE_DISK:
+            case FILE_TYPE_PIPE:
+            case FILE_TYPE_REMOTE:
+                return true;
+
+            case FILE_TYPE_UNKNOWN:
+                if (GetLastError() == NO_ERROR)
+                    return true;
+                break;
+
+            default:
+                break;
+        }
+    }
+    return false;
+}
+
+
+#define LOW_DWORD(u64) ((DWORD)u64)
+#define HIGH_DWORD(u64) (((DWORD *)&u64)[1])
+
+RTR3DECL(int)  RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /* Check arguments. */
+    if (fLock & ~RTFILE_LOCK_MASK)
+    {
+        AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /* Prepare flags. */
+    Assert(RTFILE_LOCK_WRITE);
+    DWORD dwFlags = (fLock & RTFILE_LOCK_WRITE) ? LOCKFILE_EXCLUSIVE_LOCK : 0;
+    Assert(RTFILE_LOCK_WAIT);
+    if (!(fLock & RTFILE_LOCK_WAIT))
+        dwFlags |= LOCKFILE_FAIL_IMMEDIATELY;
+
+    /* Windows structure. */
+    OVERLAPPED Overlapped;
+    memset(&Overlapped, 0, sizeof(Overlapped));
+    Overlapped.Offset = LOW_DWORD(offLock);
+    Overlapped.OffsetHigh = HIGH_DWORD(offLock);
+
+    /* Note: according to Microsoft, LockFileEx API call is available starting from NT 3.5 */
+    if (LockFileEx((HANDLE)RTFileToNative(hFile), dwFlags, 0, LOW_DWORD(cbLock), HIGH_DWORD(cbLock), &Overlapped))
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+RTR3DECL(int)  RTFileChangeLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /* Check arguments. */
+    if (fLock & ~RTFILE_LOCK_MASK)
+    {
+        AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /* Remove old lock. */
+    int rc = RTFileUnlock(hFile, offLock, cbLock);
+    if (RT_FAILURE(rc))
+        return rc;
+
+    /* Set new lock. */
+    rc = RTFileLock(hFile, fLock, offLock, cbLock);
+    if (RT_SUCCESS(rc))
+        return rc;
+
+    /* Try to restore old lock. */
+    unsigned fLockOld = (fLock & RTFILE_LOCK_WRITE) ? fLock & ~RTFILE_LOCK_WRITE : fLock | RTFILE_LOCK_WRITE;
+    rc = RTFileLock(hFile, fLockOld, offLock, cbLock);
+    if (RT_SUCCESS(rc))
+        return VERR_FILE_LOCK_VIOLATION;
+    else
+        return VERR_FILE_LOCK_LOST;
+}
+
+
+RTR3DECL(int)  RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    if (UnlockFile((HANDLE)RTFileToNative(hFile),
+                   LOW_DWORD(offLock), HIGH_DWORD(offLock),
+                   LOW_DWORD(cbLock), HIGH_DWORD(cbLock)))
+        return VINF_SUCCESS;
+
+    return RTErrConvertFromWin32(GetLastError());
+}
+
+
+
+RTR3DECL(int) RTFileQueryInfo(RTFILE hFile, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAdditionalAttribs)
+{
+    /*
+     * Validate input.
+     */
+    if (hFile == NIL_RTFILE)
+    {
+        AssertMsgFailed(("Invalid hFile=%RTfile\n", hFile));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (!pObjInfo)
+    {
+        AssertMsgFailed(("Invalid pObjInfo=%p\n", pObjInfo));
+        return VERR_INVALID_PARAMETER;
+    }
+    if (    enmAdditionalAttribs < RTFSOBJATTRADD_NOTHING
+        ||  enmAdditionalAttribs > RTFSOBJATTRADD_LAST)
+    {
+        AssertMsgFailed(("Invalid enmAdditionalAttribs=%p\n", enmAdditionalAttribs));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Query file info.
+     */
+    HANDLE hHandle = (HANDLE)RTFileToNative(hFile);
+#if 1
+    uint64_t auBuf[168 / sizeof(uint64_t)]; /* Missing FILE_ALL_INFORMATION here. */
+    int rc = rtPathNtQueryInfoFromHandle(hFile, auBuf, sizeof(auBuf), pObjInfo, enmAdditionalAttribs, NULL, 0);
+    if (RT_SUCCESS(rc))
+        return rc;
+
+    /*
+     * Console I/O handles make trouble here.  On older windows versions they
+     * end up with ERROR_INVALID_HANDLE when handed to the above API, while on
+     * more recent ones they cause different errors to appear.
+     *
+     * Thus, we must ignore the latter and doubly verify invalid handle claims.
+     * We use the undocumented VerifyConsoleIoHandle to do this, falling back on
+     * GetFileType should it not be there.
+     */
+    if (   rc == VERR_INVALID_HANDLE
+        || rc == VERR_ACCESS_DENIED
+        || rc == VERR_UNEXPECTED_FS_OBJ_TYPE)
+    {
+        static PFNVERIFYCONSOLEIOHANDLE s_pfnVerifyConsoleIoHandle = NULL;
+        static bool volatile            s_fInitialized = false;
+        PFNVERIFYCONSOLEIOHANDLE        pfnVerifyConsoleIoHandle;
+        if (s_fInitialized)
+            pfnVerifyConsoleIoHandle = s_pfnVerifyConsoleIoHandle;
+        else
+        {
+            pfnVerifyConsoleIoHandle = (PFNVERIFYCONSOLEIOHANDLE)RTLdrGetSystemSymbol("kernel32.dll", "VerifyConsoleIoHandle");
+            ASMAtomicWriteBool(&s_fInitialized, true);
+        }
+        if (   pfnVerifyConsoleIoHandle
+            ? !pfnVerifyConsoleIoHandle(hHandle)
+            : GetFileType(hHandle) == FILE_TYPE_UNKNOWN && GetLastError() != NO_ERROR)
+            return VERR_INVALID_HANDLE;
+    }
+    /*
+     * On Windows 10 and (hopefully) 8.1 we get ERROR_INVALID_FUNCTION with console
+     * I/O handles and null device handles.  We must ignore these just like the
+     * above invalid handle error.
+     */
+    else if (rc != VERR_INVALID_FUNCTION && rc != VERR_IO_BAD_COMMAND)
+        return rc;
+
+    RT_ZERO(*pObjInfo);
+    pObjInfo->Attr.enmAdditional = enmAdditionalAttribs;
+    pObjInfo->Attr.fMode = rtFsModeFromDos(RTFS_DOS_NT_DEVICE, "", 0, 0, 0);
+    return VINF_SUCCESS;
+#else
+
+    BY_HANDLE_FILE_INFORMATION Data;
+    if (!GetFileInformationByHandle(hHandle, &Data))
+    {
+        /*
+         * Console I/O handles make trouble here.  On older windows versions they
+         * end up with ERROR_INVALID_HANDLE when handed to the above API, while on
+         * more recent ones they cause different errors to appear.
+         *
+         * Thus, we must ignore the latter and doubly verify invalid handle claims.
+         * We use the undocumented VerifyConsoleIoHandle to do this, falling back on
+         * GetFileType should it not be there.
+         */
+        DWORD dwErr = GetLastError();
+        if (dwErr == ERROR_INVALID_HANDLE)
+        {
+            static PFNVERIFYCONSOLEIOHANDLE s_pfnVerifyConsoleIoHandle = NULL;
+            static bool volatile            s_fInitialized = false;
+            PFNVERIFYCONSOLEIOHANDLE        pfnVerifyConsoleIoHandle;
+            if (s_fInitialized)
+                pfnVerifyConsoleIoHandle = s_pfnVerifyConsoleIoHandle;
+            else
+            {
+                pfnVerifyConsoleIoHandle = (PFNVERIFYCONSOLEIOHANDLE)RTLdrGetSystemSymbol("kernel32.dll", "VerifyConsoleIoHandle");
+                ASMAtomicWriteBool(&s_fInitialized, true);
+            }
+            if (   pfnVerifyConsoleIoHandle
+                ? !pfnVerifyConsoleIoHandle(hHandle)
+                : GetFileType(hHandle) == FILE_TYPE_UNKNOWN && GetLastError() != NO_ERROR)
+                return VERR_INVALID_HANDLE;
+        }
+        /*
+         * On Windows 10 and (hopefully) 8.1 we get ERROR_INVALID_FUNCTION with console I/O
+         * handles.  We must ignore these just like the above invalid handle error.
+         */
+        else if (dwErr != ERROR_INVALID_FUNCTION)
+            return RTErrConvertFromWin32(dwErr);
+
+        RT_ZERO(Data);
+        Data.dwFileAttributes = RTFS_DOS_NT_DEVICE;
+    }
+
+    /*
+     * Setup the returned data.
+     */
+    pObjInfo->cbObject    = ((uint64_t)Data.nFileSizeHigh << 32)
+                          |  (uint64_t)Data.nFileSizeLow;
+    pObjInfo->cbAllocated = pObjInfo->cbObject;
+
+    Assert(sizeof(uint64_t) == sizeof(Data.ftCreationTime));
+    RTTimeSpecSetNtTime(&pObjInfo->BirthTime,         *(uint64_t *)&Data.ftCreationTime);
+    RTTimeSpecSetNtTime(&pObjInfo->AccessTime,        *(uint64_t *)&Data.ftLastAccessTime);
+    RTTimeSpecSetNtTime(&pObjInfo->ModificationTime,  *(uint64_t *)&Data.ftLastWriteTime);
+    pObjInfo->ChangeTime  = pObjInfo->ModificationTime;
+
+    pObjInfo->Attr.fMode  = rtFsModeFromDos((Data.dwFileAttributes << RTFS_DOS_SHIFT) & RTFS_DOS_MASK_NT, "", 0,
+                                            RTFSMODE_SYMLINK_REPARSE_TAG /* (symlink or not, doesn't usually matter here) */);
+
+    /*
+     * Requested attributes (we cannot provide anything actually).
+     */
+    switch (enmAdditionalAttribs)
+    {
+        case RTFSOBJATTRADD_NOTHING:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_NOTHING;
+            break;
+
+        case RTFSOBJATTRADD_UNIX:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX;
+            pObjInfo->Attr.u.Unix.uid             = ~0U;
+            pObjInfo->Attr.u.Unix.gid             = ~0U;
+            pObjInfo->Attr.u.Unix.cHardlinks      = Data.nNumberOfLinks ? Data.nNumberOfLinks : 1;
+            pObjInfo->Attr.u.Unix.INodeIdDevice   = Data.dwVolumeSerialNumber;
+            pObjInfo->Attr.u.Unix.INodeId         = RT_MAKE_U64(Data.nFileIndexLow, Data.nFileIndexHigh);
+            pObjInfo->Attr.u.Unix.fFlags          = 0;
+            pObjInfo->Attr.u.Unix.GenerationId    = 0;
+            pObjInfo->Attr.u.Unix.Device          = 0;
+            break;
+
+        case RTFSOBJATTRADD_UNIX_OWNER:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_OWNER;
+            pObjInfo->Attr.u.UnixOwner.uid        = ~0U;
+            pObjInfo->Attr.u.UnixOwner.szName[0]  = '\0'; /** @todo return something sensible here. */
+            break;
+
+        case RTFSOBJATTRADD_UNIX_GROUP:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_UNIX_GROUP;
+            pObjInfo->Attr.u.UnixGroup.gid        = ~0U;
+            pObjInfo->Attr.u.UnixGroup.szName[0]  = '\0';
+            break;
+
+        case RTFSOBJATTRADD_EASIZE:
+            pObjInfo->Attr.enmAdditional          = RTFSOBJATTRADD_EASIZE;
+            pObjInfo->Attr.u.EASize.cb            = 0;
+            break;
+
+        default:
+            AssertMsgFailed(("Impossible!\n"));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+#endif
+}
+
+
+RTR3DECL(int) RTFileSetTimes(RTFILE hFile, PCRTTIMESPEC pAccessTime, PCRTTIMESPEC pModificationTime,
+                             PCRTTIMESPEC pChangeTime, PCRTTIMESPEC pBirthTime)
+{
+    RT_NOREF_PV(pChangeTime); /* Not exposed thru the windows API we're using. */
+
+    if (!pAccessTime && !pModificationTime && !pBirthTime)
+        return VINF_SUCCESS;    /* NOP */
+
+    FILETIME    CreationTimeFT;
+    PFILETIME   pCreationTimeFT = NULL;
+    if (pBirthTime)
+        pCreationTimeFT = RTTimeSpecGetNtFileTime(pBirthTime, &CreationTimeFT);
+
+    FILETIME    LastAccessTimeFT;
+    PFILETIME   pLastAccessTimeFT = NULL;
+    if (pAccessTime)
+        pLastAccessTimeFT = RTTimeSpecGetNtFileTime(pAccessTime, &LastAccessTimeFT);
+
+    FILETIME    LastWriteTimeFT;
+    PFILETIME   pLastWriteTimeFT = NULL;
+    if (pModificationTime)
+        pLastWriteTimeFT = RTTimeSpecGetNtFileTime(pModificationTime, &LastWriteTimeFT);
+
+    int rc = VINF_SUCCESS;
+    if (!SetFileTime((HANDLE)RTFileToNative(hFile), pCreationTimeFT, pLastAccessTimeFT, pLastWriteTimeFT))
+    {
+        DWORD Err = GetLastError();
+        rc = RTErrConvertFromWin32(Err);
+        Log(("RTFileSetTimes(%RTfile, %p, %p, %p, %p): SetFileTime failed with lasterr %d (%Rrc)\n",
+             hFile, pAccessTime, pModificationTime, pChangeTime, pBirthTime, Err, rc));
+    }
+    return rc;
+}
+
+
+#if 0 /* RTFileSetMode is implemented by RTFileSetMode-r3-nt.cpp */
+/* This comes from a source file with a different set of system headers (DDK)
+ * so it can't be declared in a common header, like internal/file.h.
+ */
+extern int rtFileNativeSetAttributes(HANDLE FileHandle, ULONG FileAttributes);
+
+
+RTR3DECL(int) RTFileSetMode(RTFILE hFile, RTFMODE fMode)
+{
+    /*
+     * Normalize the mode and call the API.
+     */
+    fMode = rtFsModeNormalize(fMode, NULL, 0);
+    if (!rtFsModeIsValid(fMode))
+        return VERR_INVALID_PARAMETER;
+
+    ULONG FileAttributes = (fMode & RTFS_DOS_MASK) >> RTFS_DOS_SHIFT;
+    int Err = rtFileNativeSetAttributes((HANDLE)hFile, FileAttributes);
+    if (Err != ERROR_SUCCESS)
+    {
+        int rc = RTErrConvertFromWin32(Err);
+        Log(("RTFileSetMode(%RTfile, %RTfmode): rtFileNativeSetAttributes (0x%08X) failed with err %d (%Rrc)\n",
+             hFile, fMode, FileAttributes, Err, rc));
+        return rc;
+    }
+    return VINF_SUCCESS;
+}
+#endif
+
+
+/* RTFileQueryFsSizes is implemented by ../nt/RTFileQueryFsSizes-nt.cpp */
+
+
+RTR3DECL(int)  RTFileDelete(const char *pszFilename)
+{
+    PRTUTF16 pwszFilename;
+    int rc = RTPathWinFromUtf8(&pwszFilename, pszFilename, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+    {
+        if (!DeleteFileW(pwszFilename))
+            rc = RTErrConvertFromWin32(GetLastError());
+        RTPathWinFree(pwszFilename);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTFileRename(const char *pszSrc, const char *pszDst, unsigned fRename)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszSrc, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszDst, VERR_INVALID_POINTER);
+    AssertMsgReturn(!(fRename & ~RTPATHRENAME_FLAGS_REPLACE), ("%#x\n", fRename), VERR_INVALID_PARAMETER);
+
+    /*
+     * Hand it on to the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst,
+                                   fRename & RTPATHRENAME_FLAGS_REPLACE ? MOVEFILE_REPLACE_EXISTING : 0,
+                                   RTFS_TYPE_FILE);
+
+    LogFlow(("RTFileMove(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
+             pszSrc, pszSrc, pszDst, pszDst, fRename, rc));
+    return rc;
+
+}
+
+
+RTDECL(int) RTFileMove(const char *pszSrc, const char *pszDst, unsigned fMove)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtrReturn(pszSrc, VERR_INVALID_POINTER);
+    AssertPtrReturn(pszDst, VERR_INVALID_POINTER);
+    AssertMsgReturn(!(fMove & ~RTFILEMOVE_FLAGS_REPLACE), ("%#x\n", fMove), VERR_INVALID_PARAMETER);
+
+    /*
+     * Hand it on to the worker.
+     */
+    int rc = rtPathWin32MoveRename(pszSrc, pszDst,
+                                   fMove & RTFILEMOVE_FLAGS_REPLACE
+                                   ? MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING
+                                   : MOVEFILE_COPY_ALLOWED,
+                                   RTFS_TYPE_FILE);
+
+    LogFlow(("RTFileMove(%p:{%s}, %p:{%s}, %#x): returns %Rrc\n",
+             pszSrc, pszSrc, pszDst, pszDst, fMove, rc));
+    return rc;
+}
+