Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

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

1 files changed, 3697 insertions, 0 deletions

diff --git a/xpcom/io/nsLocalFileWin.cpp b/xpcom/io/nsLocalFileWin.cpp
new file mode 100644
index 0000000000..13fea1d2ca
--- /dev/null
+++ b/xpcom/io/nsLocalFileWin.cpp
@@ -0,0 +1,3697 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/TextUtils.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "mozilla/Utf8.h"
+#include "mozilla/WinHeaderOnlyUtils.h"
+
+#include "nsCOMPtr.h"
+
+#include "nsLocalFile.h"
+#include "nsLocalFileCommon.h"
+#include "nsIDirectoryEnumerator.h"
+#include "nsNativeCharsetUtils.h"
+
+#include "nsSimpleEnumerator.h"
+#include "prio.h"
+#include "private/pprio.h"  // To get PR_ImportFile
+#include "nsHashKeys.h"
+
+#include "nsString.h"
+#include "nsReadableUtils.h"
+
+#include <direct.h>
+#include <fileapi.h>
+#include <windows.h>
+#include <shlwapi.h>
+#include <aclapi.h>
+
+#include "shellapi.h"
+#include "shlguid.h"
+
+#include <io.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <mbstring.h>
+
+#include "prproces.h"
+#include "prlink.h"
+
+#include "mozilla/FilePreferences.h"
+#include "mozilla/Mutex.h"
+#include "SpecialSystemDirectory.h"
+
+#include "nsTraceRefcnt.h"
+#include "nsXPCOMCIDInternal.h"
+#include "nsThreadUtils.h"
+#include "nsXULAppAPI.h"
+#include "nsIWindowMediator.h"
+
+#include "mozIDOMWindow.h"
+#include "nsPIDOMWindow.h"
+#include "nsIWidget.h"
+#include "mozilla/ShellHeaderOnlyUtils.h"
+#include "mozilla/WidgetUtils.h"
+#include "WinUtils.h"
+
+using namespace mozilla;
+using mozilla::FilePreferences::kDevicePathSpecifier;
+using mozilla::FilePreferences::kPathSeparator;
+
+#define CHECK_mWorkingPath()                                     \
+  do {                                                           \
+    if (mWorkingPath.IsEmpty()) return NS_ERROR_NOT_INITIALIZED; \
+  } while (0)
+
+#ifndef FILE_ATTRIBUTE_NOT_CONTENT_INDEXED
+#  define FILE_ATTRIBUTE_NOT_CONTENT_INDEXED 0x00002000
+#endif
+
+#ifndef DRIVE_REMOTE
+#  define DRIVE_REMOTE 4
+#endif
+
+namespace {
+
+nsresult NewLocalFile(const nsAString& aPath, bool aUseDOSDevicePathSyntax,
+                      nsIFile** aResult) {
+  RefPtr<nsLocalFile> file = new nsLocalFile();
+
+  file->SetUseDOSDevicePathSyntax(aUseDOSDevicePathSyntax);
+
+  if (!aPath.IsEmpty()) {
+    nsresult rv = file->InitWithPath(aPath);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  file.forget(aResult);
+  return NS_OK;
+}
+
+}  // anonymous namespace
+
+static HWND GetMostRecentNavigatorHWND() {
+  nsresult rv;
+  nsCOMPtr<nsIWindowMediator> winMediator(
+      do_GetService(NS_WINDOWMEDIATOR_CONTRACTID, &rv));
+  if (NS_FAILED(rv)) {
+    return nullptr;
+  }
+
+  nsCOMPtr<mozIDOMWindowProxy> navWin;
+  rv = winMediator->GetMostRecentWindow(u"navigator:browser",
+                                        getter_AddRefs(navWin));
+  if (NS_FAILED(rv) || !navWin) {
+    return nullptr;
+  }
+
+  nsPIDOMWindowOuter* win = nsPIDOMWindowOuter::From(navWin);
+  nsCOMPtr<nsIWidget> widget = widget::WidgetUtils::DOMWindowToWidget(win);
+  if (!widget) {
+    return nullptr;
+  }
+
+  return reinterpret_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
+}
+
+nsresult nsLocalFile::RevealFile(const nsString& aResolvedPath) {
+  MOZ_ASSERT(!NS_IsMainThread(), "Don't run on the main thread");
+
+  DWORD attributes = GetFileAttributesW(aResolvedPath.get());
+  if (INVALID_FILE_ATTRIBUTES == attributes) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  HRESULT hr;
+  if (attributes & FILE_ATTRIBUTE_DIRECTORY) {
+    // We have a directory so we should open the directory itself.
+    LPITEMIDLIST dir = ILCreateFromPathW(aResolvedPath.get());
+    if (!dir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    LPCITEMIDLIST selection[] = {dir};
+    UINT count = ArrayLength(selection);
+
+    // Perform the open of the directory.
+    hr = SHOpenFolderAndSelectItems(dir, count, selection, 0);
+    CoTaskMemFree(dir);
+  } else {
+    int32_t len = aResolvedPath.Length();
+    // We don't currently handle UNC long paths of the form \\?\ anywhere so
+    // this should be fine.
+    if (len > MAX_PATH) {
+      return NS_ERROR_FILE_INVALID_PATH;
+    }
+    WCHAR parentDirectoryPath[MAX_PATH + 1] = {0};
+    wcsncpy(parentDirectoryPath, aResolvedPath.get(), MAX_PATH);
+    PathRemoveFileSpecW(parentDirectoryPath);
+
+    // We have a file so we should open the parent directory.
+    LPITEMIDLIST dir = ILCreateFromPathW(parentDirectoryPath);
+    if (!dir) {
+      return NS_ERROR_FAILURE;
+    }
+
+    // Set the item in the directory to select to the file we want to reveal.
+    LPITEMIDLIST item = ILCreateFromPathW(aResolvedPath.get());
+    if (!item) {
+      CoTaskMemFree(dir);
+      return NS_ERROR_FAILURE;
+    }
+
+    LPCITEMIDLIST selection[] = {item};
+    UINT count = ArrayLength(selection);
+
+    // Perform the selection of the file.
+    hr = SHOpenFolderAndSelectItems(dir, count, selection, 0);
+
+    CoTaskMemFree(dir);
+    CoTaskMemFree(item);
+  }
+
+  return SUCCEEDED(hr) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+// static
+bool nsLocalFile::CheckForReservedFileName(const nsString& aFileName) {
+  static const nsLiteralString forbiddenNames[] = {
+      u"COM1"_ns, u"COM2"_ns, u"COM3"_ns, u"COM4"_ns, u"COM5"_ns,  u"COM6"_ns,
+      u"COM7"_ns, u"COM8"_ns, u"COM9"_ns, u"LPT1"_ns, u"LPT2"_ns,  u"LPT3"_ns,
+      u"LPT4"_ns, u"LPT5"_ns, u"LPT6"_ns, u"LPT7"_ns, u"LPT8"_ns,  u"LPT9"_ns,
+      u"CON"_ns,  u"PRN"_ns,  u"AUX"_ns,  u"NUL"_ns,  u"CLOCK$"_ns};
+
+  for (const nsLiteralString& forbiddenName : forbiddenNames) {
+    if (StringBeginsWith(aFileName, forbiddenName,
+                         nsASCIICaseInsensitiveStringComparator)) {
+      // invalid name is either the entire string, or a prefix with a period
+      if (aFileName.Length() == forbiddenName.Length() ||
+          aFileName.CharAt(forbiddenName.Length()) == char16_t('.')) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+class nsDriveEnumerator : public nsSimpleEnumerator,
+                          public nsIDirectoryEnumerator {
+ public:
+  explicit nsDriveEnumerator(bool aUseDOSDevicePathSyntax);
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSISIMPLEENUMERATOR
+  NS_FORWARD_NSISIMPLEENUMERATORBASE(nsSimpleEnumerator::)
+  nsresult Init();
+
+  const nsID& DefaultInterface() override { return NS_GET_IID(nsIFile); }
+
+  NS_IMETHOD GetNextFile(nsIFile** aResult) override {
+    bool hasMore = false;
+    nsresult rv = HasMoreElements(&hasMore);
+    if (NS_FAILED(rv) || !hasMore) {
+      return rv;
+    }
+    nsCOMPtr<nsISupports> next;
+    rv = GetNext(getter_AddRefs(next));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIFile> result = do_QueryInterface(next);
+    result.forget(aResult);
+    return NS_OK;
+  }
+
+  NS_IMETHOD Close() override { return NS_OK; }
+
+ private:
+  virtual ~nsDriveEnumerator();
+
+  /* mDrives stores the null-separated drive names.
+   * Init sets them.
+   * HasMoreElements checks mStartOfCurrentDrive.
+   * GetNext advances mStartOfCurrentDrive.
+   */
+  nsString mDrives;
+  nsAString::const_iterator mStartOfCurrentDrive;
+  nsAString::const_iterator mEndOfDrivesString;
+  const bool mUseDOSDevicePathSyntax;
+};
+
+//-----------------------------------------------------------------------------
+// static helper functions
+//-----------------------------------------------------------------------------
+
+/**
+ * While not comprehensive, this will map many common Windows error codes to a
+ * corresponding nsresult. If an unmapped error is encountered, the hex error
+ * code will be logged to stderr. Error codes, names, and descriptions can be
+ * found at the following MSDN page:
+ * https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes
+ *
+ * \note When adding more mappings here, it must be checked if there's code that
+ * depends on the current generic NS_ERROR_MODULE_WIN32 mapping for such error
+ * codes.
+ */
+static nsresult ConvertWinError(DWORD aWinErr) {
+  nsresult rv;
+
+  switch (aWinErr) {
+    case ERROR_FILE_NOT_FOUND:
+      [[fallthrough]];  // to NS_ERROR_FILE_NOT_FOUND
+    case ERROR_PATH_NOT_FOUND:
+      [[fallthrough]];  // to NS_ERROR_FILE_NOT_FOUND
+    case ERROR_INVALID_DRIVE:
+      rv = NS_ERROR_FILE_NOT_FOUND;
+      break;
+    case ERROR_ACCESS_DENIED:
+      [[fallthrough]];  // to NS_ERROR_FILE_ACCESS_DENIED
+    case ERROR_NOT_SAME_DEVICE:
+      [[fallthrough]];  // to NS_ERROR_FILE_ACCESS_DENIED
+    case ERROR_CANNOT_MAKE:
+      [[fallthrough]];  // to NS_ERROR_FILE_ACCESS_DENIED
+    case ERROR_CONTENT_BLOCKED:
+      rv = NS_ERROR_FILE_ACCESS_DENIED;
+      break;
+    case ERROR_SHARING_VIOLATION:  // CreateFile without sharing flags
+      [[fallthrough]];             // to NS_ERROR_FILE_IS_LOCKED
+    case ERROR_LOCK_VIOLATION:     // LockFile, LockFileEx
+      rv = NS_ERROR_FILE_IS_LOCKED;
+      break;
+    case ERROR_NOT_ENOUGH_MEMORY:
+      [[fallthrough]];  // to NS_ERROR_OUT_OF_MEMORY
+    case ERROR_NO_SYSTEM_RESOURCES:
+      rv = NS_ERROR_OUT_OF_MEMORY;
+      break;
+    case ERROR_DIR_NOT_EMPTY:
+      [[fallthrough]];  // to NS_ERROR_FILE_DIR_NOT_EMPTY
+    case ERROR_CURRENT_DIRECTORY:
+      rv = NS_ERROR_FILE_DIR_NOT_EMPTY;
+      break;
+    case ERROR_WRITE_PROTECT:
+      rv = NS_ERROR_FILE_READ_ONLY;
+      break;
+    case ERROR_HANDLE_DISK_FULL:
+      [[fallthrough]];  // to NS_ERROR_FILE_NO_DEVICE_SPACE
+    case ERROR_DISK_FULL:
+      rv = NS_ERROR_FILE_NO_DEVICE_SPACE;
+      break;
+    case ERROR_FILE_EXISTS:
+      [[fallthrough]];  // to NS_ERROR_FILE_ALREADY_EXISTS
+    case ERROR_ALREADY_EXISTS:
+      rv = NS_ERROR_FILE_ALREADY_EXISTS;
+      break;
+    case ERROR_FILENAME_EXCED_RANGE:
+      rv = NS_ERROR_FILE_NAME_TOO_LONG;
+      break;
+    case ERROR_DIRECTORY:
+      rv = NS_ERROR_FILE_NOT_DIRECTORY;
+      break;
+    case ERROR_FILE_CORRUPT:
+      [[fallthrough]];  // to NS_ERROR_FILE_FS_CORRUPTED
+    case ERROR_DISK_CORRUPT:
+      rv = NS_ERROR_FILE_FS_CORRUPTED;
+      break;
+    case ERROR_DEVICE_HARDWARE_ERROR:
+      [[fallthrough]];  // to NS_ERROR_FILE_DEVICE_FAILURE
+    case ERROR_DEVICE_NOT_CONNECTED:
+      [[fallthrough]];  // to NS_ERROR_FILE_DEVICE_FAILURE
+    case ERROR_DEV_NOT_EXIST:
+      [[fallthrough]];  // to NS_ERROR_FILE_DEVICE_FAILURE
+    case ERROR_IO_DEVICE:
+      rv = NS_ERROR_FILE_DEVICE_FAILURE;
+      break;
+    case ERROR_NOT_READY:
+      rv = NS_ERROR_FILE_DEVICE_TEMPORARY_FAILURE;
+      break;
+    case ERROR_INVALID_NAME:
+      rv = NS_ERROR_FILE_INVALID_PATH;
+      break;
+    case ERROR_INVALID_BLOCK:
+      [[fallthrough]];  // to NS_ERROR_FILE_INVALID_HANDLE
+    case ERROR_INVALID_HANDLE:
+      [[fallthrough]];  // to NS_ERROR_FILE_INVALID_HANDLE
+    case ERROR_ARENA_TRASHED:
+      rv = NS_ERROR_FILE_INVALID_HANDLE;
+      break;
+    case 0:
+      rv = NS_OK;
+      break;
+    default:
+      printf_stderr(
+          "ConvertWinError received an unrecognized WinError: 0x%" PRIx32 "\n",
+          static_cast<uint32_t>(aWinErr));
+      MOZ_ASSERT((aWinErr & 0xFFFF) == aWinErr);
+      rv = NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_WIN32, aWinErr & 0xFFFF);
+      break;
+  }
+  return rv;
+}
+
+// Check whether a path is a volume root. Expects paths to be \-terminated.
+static bool IsRootPath(const nsAString& aPath) {
+  // Easy cases first:
+  if (aPath.Last() != L'\\') {
+    return false;
+  }
+  if (StringEndsWith(aPath, u":\\"_ns)) {
+    return true;
+  }
+
+  nsAString::const_iterator begin, end;
+  aPath.BeginReading(begin);
+  aPath.EndReading(end);
+  // We know we've got a trailing slash, skip that:
+  end--;
+  // Find the next last slash:
+  if (RFindInReadable(u"\\"_ns, begin, end)) {
+    // Reset iterator:
+    aPath.EndReading(end);
+    end--;
+    auto lastSegment = Substring(++begin, end);
+    if (lastSegment.IsEmpty()) {
+      return false;
+    }
+
+    // Check if we end with e.g. "c$", a drive letter in UNC or network shares
+    if (lastSegment.Last() == L'$' && lastSegment.Length() == 2 &&
+        IsAsciiAlpha(lastSegment.First())) {
+      return true;
+    }
+    // Volume GUID paths:
+    if (StringBeginsWith(lastSegment, u"Volume{"_ns) &&
+        lastSegment.Last() == L'}') {
+      return true;
+    }
+  }
+  return false;
+}
+
+static auto kSpecialNTFSFilesInRoot = {
+    u"$MFT"_ns,     u"$MFTMirr"_ns, u"$LogFile"_ns, u"$Volume"_ns,
+    u"$AttrDef"_ns, u"$Bitmap"_ns,  u"$Boot"_ns,    u"$BadClus"_ns,
+    u"$Secure"_ns,  u"$UpCase"_ns,  u"$Extend"_ns};
+static bool IsSpecialNTFSPath(const nsAString& aFilePath) {
+  nsAString::const_iterator begin, end;
+  aFilePath.BeginReading(begin);
+  aFilePath.EndReading(end);
+  auto iter = begin;
+  // Early exit if there's no '$' (common case)
+  if (!FindCharInReadable(L'$', iter, end)) {
+    return false;
+  }
+
+  iter = begin;
+  // Any use of ':$' is illegal in filenames anyway; while we support some
+  // ADS stuff (ie ":Zone.Identifier"), none of them use the ':$' syntax:
+  if (FindInReadable(u":$"_ns, iter, end)) {
+    return true;
+  }
+
+  auto normalized = mozilla::MakeUniqueFallible<wchar_t[]>(MAX_PATH);
+  if (!normalized) {
+    return true;
+  }
+  auto flatPath = PromiseFlatString(aFilePath);
+  auto fullPathRV =
+      GetFullPathNameW(flatPath.get(), MAX_PATH - 1, normalized.get(), nullptr);
+  if (fullPathRV == 0 || fullPathRV > MAX_PATH - 1) {
+    return false;
+  }
+
+  nsString normalizedPath(normalized.get());
+  normalizedPath.BeginReading(begin);
+  normalizedPath.EndReading(end);
+  iter = begin;
+  auto kDelimiters = u"\\:"_ns;
+  while (iter != end && FindCharInReadable(L'$', iter, end)) {
+    for (auto str : kSpecialNTFSFilesInRoot) {
+      if (StringBeginsWith(Substring(iter, end), str,
+                           nsCaseInsensitiveStringComparator)) {
+        // If we're enclosed by separators or the beginning/end of the string,
+        // this is one of the special files. Check if we're on a volume root.
+        auto iterCopy = iter;
+        iterCopy.advance(str.Length());
+        // We check for both \ and : here because the filename could be
+        // followd by a colon and a stream name/type, which shouldn't affect
+        // our check:
+        if (iterCopy == end || kDelimiters.Contains(*iterCopy)) {
+          iterCopy = iter;
+          // At the start of this path component, we don't need to care about
+          // colons: we would have caught those in the check for `:$` above.
+          if (iterCopy == begin || *(--iterCopy) == L'\\') {
+            return IsRootPath(Substring(begin, iter));
+          }
+        }
+      }
+    }
+    iter++;
+  }
+
+  return false;
+}
+
+//-----------------------------------------------------------------------------
+// We need the following three definitions to make |OpenFile| convert a file
+// handle to an NSPR file descriptor correctly when |O_APPEND| flag is
+// specified. It is defined in a private header of NSPR (primpl.h) we can't
+// include. As a temporary workaround until we decide how to extend
+// |PR_ImportFile|, we define it here. Currently, |_PR_HAVE_PEEK_BUFFER|
+// and |PR_STRICT_ADDR_LEN| are not defined for the 'w95'-dependent portion
+// of NSPR so that fields of |PRFilePrivate| #ifdef'd by them are not copied.
+// Similarly, |_MDFileDesc| is taken from nsprpub/pr/include/md/_win95.h.
+// In an unlikely case we switch to 'NT'-dependent NSPR AND this temporary
+// workaround last beyond the switch, |PRFilePrivate| and |_MDFileDesc|
+// need to be changed to match the definitions for WinNT.
+//-----------------------------------------------------------------------------
+typedef enum {
+  _PR_TRI_TRUE = 1,
+  _PR_TRI_FALSE = 0,
+  _PR_TRI_UNKNOWN = -1
+} _PRTriStateBool;
+
+struct _MDFileDesc {
+  PROsfd osfd;
+};
+
+struct PRFilePrivate {
+  int32_t state;
+  bool nonblocking;
+  _PRTriStateBool inheritable;
+  PRFileDesc* next;
+  int lockCount; /*   0: not locked
+                  *  -1: a native lockfile call is in progress
+                  * > 0: # times the file is locked */
+  bool appendMode;
+  _MDFileDesc md;
+};
+
+//-----------------------------------------------------------------------------
+// Six static methods defined below (OpenFile,  FileTimeToPRTime, GetFileInfo,
+// OpenDir, CloseDir, ReadDir) should go away once the corresponding
+// UTF-16 APIs are implemented on all the supported platforms (or at least
+// Windows 9x/ME) in NSPR. Currently, they're only implemented on
+// Windows NT4 or later. (bug 330665)
+//-----------------------------------------------------------------------------
+
+// copied from nsprpub/pr/src/{io/prfile.c | md/windows/w95io.c} :
+// PR_Open and _PR_MD_OPEN
+nsresult OpenFile(const nsString& aName, int aOsflags, int aMode,
+                  bool aShareDelete, PRFileDesc** aFd) {
+  int32_t access = 0;
+
+  int32_t shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
+  int32_t disposition = 0;
+  int32_t attributes = 0;
+
+  if (aShareDelete) {
+    shareMode |= FILE_SHARE_DELETE;
+  }
+
+  if (aOsflags & PR_SYNC) {
+    attributes = FILE_FLAG_WRITE_THROUGH;
+  }
+  if (aOsflags & PR_RDONLY || aOsflags & PR_RDWR) {
+    access |= GENERIC_READ;
+  }
+  if (aOsflags & PR_WRONLY || aOsflags & PR_RDWR) {
+    access |= GENERIC_WRITE;
+  }
+
+  if (aOsflags & PR_CREATE_FILE && aOsflags & PR_EXCL) {
+    disposition = CREATE_NEW;
+  } else if (aOsflags & PR_CREATE_FILE) {
+    if (aOsflags & PR_TRUNCATE) {
+      disposition = CREATE_ALWAYS;
+    } else {
+      disposition = OPEN_ALWAYS;
+    }
+  } else {
+    if (aOsflags & PR_TRUNCATE) {
+      disposition = TRUNCATE_EXISTING;
+    } else {
+      disposition = OPEN_EXISTING;
+    }
+  }
+
+  if (aOsflags & nsIFile::DELETE_ON_CLOSE) {
+    attributes |= FILE_FLAG_DELETE_ON_CLOSE;
+  }
+
+  if (aOsflags & nsIFile::OS_READAHEAD) {
+    attributes |= FILE_FLAG_SEQUENTIAL_SCAN;
+  }
+
+  // If no write permissions are requested, and if we are possibly creating
+  // the file, then set the new file as read only.
+  // The flag has no effect if we happen to open the file.
+  if (!(aMode & (PR_IWUSR | PR_IWGRP | PR_IWOTH)) &&
+      disposition != OPEN_EXISTING) {
+    attributes |= FILE_ATTRIBUTE_READONLY;
+  }
+
+  HANDLE file = ::CreateFileW(aName.get(), access, shareMode, nullptr,
+                              disposition, attributes, nullptr);
+
+  if (file == INVALID_HANDLE_VALUE) {
+    *aFd = nullptr;
+    return ConvertWinError(GetLastError());
+  }
+
+  *aFd = PR_ImportFile((PROsfd)file);
+  if (*aFd) {
+    // On Windows, _PR_HAVE_O_APPEND is not defined so that we have to
+    // add it manually. (see |PR_Open| in nsprpub/pr/src/io/prfile.c)
+    (*aFd)->secret->appendMode = (PR_APPEND & aOsflags) ? true : false;
+    return NS_OK;
+  }
+
+  nsresult rv = NS_ErrorAccordingToNSPR();
+
+  CloseHandle(file);
+
+  return rv;
+}
+
+// copied from nsprpub/pr/src/{io/prfile.c | md/windows/w95io.c} :
+// PR_FileTimeToPRTime and _PR_FileTimeToPRTime
+static void FileTimeToPRTime(const FILETIME* aFiletime, PRTime* aPrtm) {
+#ifdef __GNUC__
+  const PRTime _pr_filetime_offset = 116444736000000000LL;
+#else
+  const PRTime _pr_filetime_offset = 116444736000000000i64;
+#endif
+
+  MOZ_ASSERT(sizeof(FILETIME) == sizeof(PRTime));
+  ::CopyMemory(aPrtm, aFiletime, sizeof(PRTime));
+#ifdef __GNUC__
+  *aPrtm = (*aPrtm - _pr_filetime_offset) / 10LL;
+#else
+  *aPrtm = (*aPrtm - _pr_filetime_offset) / 10i64;
+#endif
+}
+
+// copied from nsprpub/pr/src/{io/prfile.c | md/windows/w95io.c} with some
+// changes : PR_GetFileInfo64, _PR_MD_GETFILEINFO64
+static nsresult GetFileInfo(const nsString& aName,
+                            nsLocalFile::FileInfo* aInfo) {
+  if (aName.IsEmpty()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // Checking u"?*" for the file path excluding the kDevicePathSpecifier.
+  // ToDo: Check if checking "?" for the file path is still needed.
+  const int32_t offset = StringBeginsWith(aName, kDevicePathSpecifier)
+                             ? kDevicePathSpecifier.Length()
+                             : 0;
+
+  if (aName.FindCharInSet(u"?*", offset) != kNotFound) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  WIN32_FILE_ATTRIBUTE_DATA fileData;
+  if (!::GetFileAttributesExW(aName.get(), GetFileExInfoStandard, &fileData)) {
+    return ConvertWinError(GetLastError());
+  }
+
+  if (fileData.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
+    aInfo->type = PR_FILE_OTHER;
+  } else if (fileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
+    aInfo->type = PR_FILE_DIRECTORY;
+  } else {
+    aInfo->type = PR_FILE_FILE;
+  }
+
+  aInfo->size = fileData.nFileSizeHigh;
+  aInfo->size = (aInfo->size << 32) + fileData.nFileSizeLow;
+
+  if (0 == fileData.ftCreationTime.dwLowDateTime &&
+      0 == fileData.ftCreationTime.dwHighDateTime) {
+    aInfo->creationTime = aInfo->modifyTime;
+  } else {
+    FileTimeToPRTime(&fileData.ftCreationTime, &aInfo->creationTime);
+  }
+
+  FileTimeToPRTime(&fileData.ftLastAccessTime, &aInfo->accessTime);
+  FileTimeToPRTime(&fileData.ftLastWriteTime, &aInfo->modifyTime);
+
+  return NS_OK;
+}
+
+struct nsDir {
+  HANDLE handle;
+  WIN32_FIND_DATAW data;
+  bool firstEntry;
+};
+
+static nsresult OpenDir(const nsString& aName, nsDir** aDir) {
+  if (NS_WARN_IF(!aDir)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aDir = nullptr;
+
+  nsDir* d = new nsDir();
+  nsAutoString filename(aName);
+
+  // If |aName| ends in a slash or backslash, do not append another backslash.
+  if (filename.Last() == L'/' || filename.Last() == L'\\') {
+    filename.Append('*');
+  } else {
+    filename.AppendLiteral("\\*");
+  }
+
+  filename.ReplaceChar(L'/', L'\\');
+
+  // FindFirstFileW Will have a last error of ERROR_DIRECTORY if
+  // <file_path>\* is passed in.  If <unknown_path>\* is passed in then
+  // ERROR_PATH_NOT_FOUND will be the last error.
+  d->handle = ::FindFirstFileW(filename.get(), &(d->data));
+
+  if (d->handle == INVALID_HANDLE_VALUE) {
+    delete d;
+    return ConvertWinError(GetLastError());
+  }
+  d->firstEntry = true;
+
+  *aDir = d;
+  return NS_OK;
+}
+
+static nsresult ReadDir(nsDir* aDir, PRDirFlags aFlags, nsString& aName) {
+  aName.Truncate();
+  if (NS_WARN_IF(!aDir)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  while (1) {
+    BOOL rv;
+    if (aDir->firstEntry) {
+      aDir->firstEntry = false;
+      rv = 1;
+    } else {
+      rv = ::FindNextFileW(aDir->handle, &(aDir->data));
+    }
+
+    if (rv == 0) {
+      break;
+    }
+
+    const wchar_t* fileName;
+    fileName = (aDir)->data.cFileName;
+
+    if ((aFlags & PR_SKIP_DOT) && (fileName[0] == L'.') &&
+        (fileName[1] == L'\0')) {
+      continue;
+    }
+    if ((aFlags & PR_SKIP_DOT_DOT) && (fileName[0] == L'.') &&
+        (fileName[1] == L'.') && (fileName[2] == L'\0')) {
+      continue;
+    }
+
+    DWORD attrib = aDir->data.dwFileAttributes;
+    if ((aFlags & PR_SKIP_HIDDEN) && (attrib & FILE_ATTRIBUTE_HIDDEN)) {
+      continue;
+    }
+
+    aName = fileName;
+    return NS_OK;
+  }
+
+  DWORD err = GetLastError();
+  return err == ERROR_NO_MORE_FILES ? NS_OK : ConvertWinError(err);
+}
+
+static nsresult CloseDir(nsDir*& aDir) {
+  if (NS_WARN_IF(!aDir)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  BOOL isOk = FindClose(aDir->handle);
+  delete aDir;
+  aDir = nullptr;
+  return isOk ? NS_OK : ConvertWinError(GetLastError());
+}
+
+//-----------------------------------------------------------------------------
+// nsDirEnumerator
+//-----------------------------------------------------------------------------
+
+class nsDirEnumerator final : public nsSimpleEnumerator,
+                              public nsIDirectoryEnumerator {
+ private:
+  ~nsDirEnumerator() { Close(); }
+
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_FORWARD_NSISIMPLEENUMERATORBASE(nsSimpleEnumerator::)
+
+  nsDirEnumerator() : mDir(nullptr) {}
+
+  const nsID& DefaultInterface() override { return NS_GET_IID(nsIFile); }
+
+  nsresult Init(nsIFile* aParent) {
+    nsAutoString filepath;
+    aParent->GetTarget(filepath);
+
+    if (filepath.IsEmpty()) {
+      aParent->GetPath(filepath);
+    }
+
+    if (filepath.IsEmpty()) {
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    // IsDirectory is not needed here because OpenDir will return
+    // NS_ERROR_FILE_NOT_DIRECTORY if the passed in path is a file.
+    nsresult rv = OpenDir(filepath, &mDir);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    mParent = aParent;
+    return NS_OK;
+  }
+
+  NS_IMETHOD HasMoreElements(bool* aResult) override {
+    nsresult rv;
+    if (!mNext && mDir) {
+      nsString name;
+      rv = ReadDir(mDir, PR_SKIP_BOTH, name);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+      if (name.IsEmpty()) {
+        // end of dir entries
+        rv = CloseDir(mDir);
+        if (NS_FAILED(rv)) {
+          return rv;
+        }
+
+        *aResult = false;
+        return NS_OK;
+      }
+
+      nsCOMPtr<nsIFile> file;
+      rv = mParent->Clone(getter_AddRefs(file));
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      rv = file->Append(name);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      mNext = file.forget();
+    }
+    *aResult = mNext != nullptr;
+    if (!*aResult) {
+      Close();
+    }
+    return NS_OK;
+  }
+
+  NS_IMETHOD GetNext(nsISupports** aResult) override {
+    nsresult rv;
+    bool hasMore;
+    rv = HasMoreElements(&hasMore);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    if (!hasMore) {
+      return NS_ERROR_FAILURE;
+    }
+
+    mNext.forget(aResult);
+    return NS_OK;
+  }
+
+  NS_IMETHOD GetNextFile(nsIFile** aResult) override {
+    *aResult = nullptr;
+    bool hasMore = false;
+    nsresult rv = HasMoreElements(&hasMore);
+    if (NS_FAILED(rv) || !hasMore) {
+      return rv;
+    }
+    mNext.forget(aResult);
+    return NS_OK;
+  }
+
+  NS_IMETHOD Close() override {
+    if (mDir) {
+      nsresult rv = CloseDir(mDir);
+      NS_ASSERTION(NS_SUCCEEDED(rv), "close failed");
+      if (NS_FAILED(rv)) {
+        return NS_ERROR_FAILURE;
+      }
+    }
+    return NS_OK;
+  }
+
+ protected:
+  nsDir* mDir;
+  nsCOMPtr<nsIFile> mParent;
+  nsCOMPtr<nsIFile> mNext;
+};
+
+NS_IMPL_ISUPPORTS_INHERITED(nsDirEnumerator, nsSimpleEnumerator,
+                            nsIDirectoryEnumerator)
+
+//-----------------------------------------------------------------------------
+// nsLocalFile <public>
+//-----------------------------------------------------------------------------
+
+nsLocalFile::nsLocalFile()
+    : mDirty(true), mResolveDirty(true), mUseDOSDevicePathSyntax(false) {}
+
+nsLocalFile::nsLocalFile(const nsAString& aFilePath)
+    : mUseDOSDevicePathSyntax(false) {
+  InitWithPath(aFilePath);
+}
+
+nsresult nsLocalFile::nsLocalFileConstructor(const nsIID& aIID,
+                                             void** aInstancePtr) {
+  if (NS_WARN_IF(!aInstancePtr)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsLocalFile* inst = new nsLocalFile();
+  nsresult rv = inst->QueryInterface(aIID, aInstancePtr);
+  if (NS_FAILED(rv)) {
+    delete inst;
+    return rv;
+  }
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsLocalFile::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(nsLocalFile, nsIFile, nsILocalFileWin)
+
+//-----------------------------------------------------------------------------
+// nsLocalFile <private>
+//-----------------------------------------------------------------------------
+
+nsLocalFile::nsLocalFile(const nsLocalFile& aOther)
+    : mDirty(true),
+      mResolveDirty(true),
+      mUseDOSDevicePathSyntax(aOther.mUseDOSDevicePathSyntax),
+      mWorkingPath(aOther.mWorkingPath) {}
+
+nsresult nsLocalFile::ResolveSymlink() {
+  std::wstring workingPath(mWorkingPath.Data());
+  if (!widget::WinUtils::ResolveJunctionPointsAndSymLinks(workingPath)) {
+    return NS_ERROR_FAILURE;
+  }
+  mResolvedPath.Assign(workingPath.c_str(), workingPath.length());
+  return NS_OK;
+}
+
+// Resolve any shortcuts and stat the resolved path. After a successful return
+// the path is guaranteed valid and the members of mFileInfo can be used.
+nsresult nsLocalFile::ResolveAndStat() {
+  // if we aren't dirty then we are already done
+  if (!mDirty) {
+    return NS_OK;
+  }
+
+  AUTO_PROFILER_LABEL("nsLocalFile::ResolveAndStat", OTHER);
+  // we can't resolve/stat anything that isn't a valid NSPR addressable path
+  if (mWorkingPath.IsEmpty()) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  // this is usually correct
+  mResolvedPath.Assign(mWorkingPath);
+
+  // Make sure root paths have a trailing slash.
+  nsAutoString nsprPath(mWorkingPath);
+  if (mWorkingPath.Length() == 2 && mWorkingPath.CharAt(1) == u':') {
+    nsprPath.Append('\\');
+  }
+
+  // first we will see if the working path exists. If it doesn't then
+  // there is nothing more that can be done
+  nsresult rv = GetFileInfo(nsprPath, &mFileInfo);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (mFileInfo.type != PR_FILE_OTHER) {
+    mResolveDirty = false;
+    mDirty = false;
+    return NS_OK;
+  }
+
+  // OTHER from GetFileInfo currently means a symlink
+  rv = ResolveSymlink();
+  // Even if it fails we need to have the resolved path equal to working path
+  // for those functions that always use the resolved path.
+  if (NS_FAILED(rv)) {
+    mResolvedPath.Assign(mWorkingPath);
+    return rv;
+  }
+
+  mResolveDirty = false;
+  // get the details of the resolved path
+  rv = GetFileInfo(mResolvedPath, &mFileInfo);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  mDirty = false;
+  return NS_OK;
+}
+
+/**
+ * Fills the mResolvedPath member variable with the file or symlink target
+ * if follow symlinks is on.  This is a copy of the Resolve parts from
+ * ResolveAndStat. ResolveAndStat is much slower though because of the stat.
+ *
+ * @return NS_OK on success.
+ */
+nsresult nsLocalFile::Resolve() {
+  // if we aren't dirty then we are already done
+  if (!mResolveDirty) {
+    return NS_OK;
+  }
+
+  // we can't resolve/stat anything that isn't a valid NSPR addressable path
+  if (mWorkingPath.IsEmpty()) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  // this is usually correct
+  mResolvedPath.Assign(mWorkingPath);
+
+  // TODO: Implement symlink support
+
+  mResolveDirty = false;
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// nsLocalFile::nsIFile
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsLocalFile::Clone(nsIFile** aFile) {
+  // Just copy-construct ourselves
+  RefPtr<nsLocalFile> file = new nsLocalFile(*this);
+  file.forget(aFile);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::InitWithFile(nsIFile* aFile) {
+  if (NS_WARN_IF(!aFile)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsAutoString path;
+  aFile->GetPath(path);
+  if (path.IsEmpty()) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  return InitWithPath(path);
+}
+
+NS_IMETHODIMP
+nsLocalFile::InitWithPath(const nsAString& aFilePath) {
+  MakeDirty();
+
+  nsAString::const_iterator begin, end;
+  aFilePath.BeginReading(begin);
+  aFilePath.EndReading(end);
+
+  // input string must not be empty
+  if (begin == end) {
+    return NS_ERROR_FAILURE;
+  }
+
+  char16_t firstChar = *begin;
+  char16_t secondChar = *(++begin);
+
+  // just do a sanity check.  if it has any forward slashes, it is not a Native
+  // path on windows.  Also, it must have a colon at after the first char.
+  if (FindCharInReadable(L'/', begin, end)) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  if (FilePreferences::IsBlockedUNCPath(aFilePath)) {
+    return NS_ERROR_FILE_ACCESS_DENIED;
+  }
+
+  if (secondChar != L':' && (secondChar != L'\\' || firstChar != L'\\')) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  if (secondChar == L':') {
+    // Make sure we have a valid drive, later code assumes the drive letter
+    // is a single char a-z or A-Z.
+    if (MozPathGetDriveNumber<wchar_t>(aFilePath.Data()) == -1) {
+      return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+    }
+  }
+
+  if (IsSpecialNTFSPath(aFilePath)) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  mWorkingPath = aFilePath;
+  // kill any trailing '\'
+  if (mWorkingPath.Last() == L'\\') {
+    mWorkingPath.Truncate(mWorkingPath.Length() - 1);
+  }
+
+  // Bug 1626514: make sure that we don't end up with multiple prefixes.
+
+  // Prepend the "\\?\" prefix if the useDOSDevicePathSyntax is set and the path
+  // starts with a disk designator and backslash.
+  if (mUseDOSDevicePathSyntax &&
+      FilePreferences::StartsWithDiskDesignatorAndBackslash(mWorkingPath)) {
+    mWorkingPath = kDevicePathSpecifier + mWorkingPath;
+  }
+
+  return NS_OK;
+}
+
+// Strip a handler command string of its quotes and parameters.
+static void CleanupHandlerPath(nsString& aPath) {
+  // Example command strings passed into this routine:
+
+  // 1) C:\Program Files\Company\some.exe -foo -bar
+  // 2) C:\Program Files\Company\some.dll
+  // 3) C:\Windows\some.dll,-foo -bar
+  // 4) C:\Windows\some.cpl,-foo -bar
+
+  int32_t lastCommaPos = aPath.RFindChar(',');
+  if (lastCommaPos != kNotFound) aPath.Truncate(lastCommaPos);
+
+  aPath.Append(' ');
+
+  // case insensitive
+  int32_t index = aPath.LowerCaseFindASCII(".exe ");
+  if (index == kNotFound) index = aPath.LowerCaseFindASCII(".dll ");
+  if (index == kNotFound) index = aPath.LowerCaseFindASCII(".cpl ");
+
+  if (index != kNotFound) aPath.Truncate(index + 4);
+  aPath.Trim(" ", true, true);
+}
+
+// Strip the windows host process bootstrap executable rundll32.exe
+// from a handler's command string if it exists.
+static void StripRundll32(nsString& aCommandString) {
+  // Example rundll formats:
+  // C:\Windows\System32\rundll32.exe "path to dll"
+  // rundll32.exe "path to dll"
+  // C:\Windows\System32\rundll32.exe "path to dll", var var
+  // rundll32.exe "path to dll", var var
+
+  constexpr auto rundllSegment = "rundll32.exe "_ns;
+  constexpr auto rundllSegmentShort = "rundll32 "_ns;
+
+  // case insensitive
+  int32_t strLen = rundllSegment.Length();
+  int32_t index = aCommandString.LowerCaseFindASCII(rundllSegment);
+  if (index == kNotFound) {
+    strLen = rundllSegmentShort.Length();
+    index = aCommandString.LowerCaseFindASCII(rundllSegmentShort);
+  }
+
+  if (index != kNotFound) {
+    uint32_t rundllSegmentLength = index + strLen;
+    aCommandString.Cut(0, rundllSegmentLength);
+  }
+}
+
+// Returns the fully qualified path to an application handler based on
+// a parameterized command string. Note this routine should not be used
+// to launch the associated application as it strips parameters and
+// rundll.exe from the string. Designed for retrieving display information
+// on a particular handler.
+/* static */
+bool nsLocalFile::CleanupCmdHandlerPath(nsAString& aCommandHandler) {
+  nsAutoString handlerCommand(aCommandHandler);
+
+  // Straight command path:
+  //
+  // %SystemRoot%\system32\NOTEPAD.EXE var
+  // "C:\Program Files\iTunes\iTunes.exe" var var
+  // C:\Program Files\iTunes\iTunes.exe var var
+  //
+  // Example rundll handlers:
+  //
+  // rundll32.exe "%ProgramFiles%\Win...ery\PhotoViewer.dll", var var
+  // rundll32.exe "%ProgramFiles%\Windows Photo Gallery\PhotoViewer.dll"
+  // C:\Windows\System32\rundll32.exe "path to dll", var var
+  // %SystemRoot%\System32\rundll32.exe "%ProgramFiles%\Win...ery\Photo
+  //    Viewer.dll", var var
+
+  // Expand environment variables so we have full path strings.
+  uint32_t bufLength =
+      ::ExpandEnvironmentStringsW(handlerCommand.get(), nullptr, 0);
+  if (bufLength == 0)  // Error
+    return false;
+
+  auto destination = mozilla::MakeUniqueFallible<wchar_t[]>(bufLength);
+  if (!destination) return false;
+  if (!::ExpandEnvironmentStringsW(handlerCommand.get(), destination.get(),
+                                   bufLength))
+    return false;
+
+  handlerCommand.Assign(destination.get());
+
+  // Remove quotes around paths
+  handlerCommand.StripChars(u"\"");
+
+  // Strip windows host process bootstrap so we can get to the actual
+  // handler.
+  StripRundll32(handlerCommand);
+
+  // Trim any command parameters so that we have a native path we can
+  // initialize a local file with.
+  CleanupHandlerPath(handlerCommand);
+
+  aCommandHandler.Assign(handlerCommand);
+  return true;
+}
+
+NS_IMETHODIMP
+nsLocalFile::InitWithCommandLine(const nsAString& aCommandLine) {
+  nsAutoString commandLine(aCommandLine);
+  if (!CleanupCmdHandlerPath(commandLine)) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+  return InitWithPath(commandLine);
+}
+
+NS_IMETHODIMP
+nsLocalFile::OpenNSPRFileDesc(int32_t aFlags, int32_t aMode,
+                              PRFileDesc** aResult) {
+  nsresult rv = OpenNSPRFileDescMaybeShareDelete(aFlags, aMode, false, aResult);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::OpenANSIFileDesc(const char* aMode, FILE** aResult) {
+  *aResult = _wfopen(mWorkingPath.get(), NS_ConvertASCIItoUTF16(aMode).get());
+  if (*aResult) {
+    return NS_OK;
+  }
+
+  return NS_ERROR_FAILURE;
+}
+
+static nsresult do_create(nsIFile* aFile, const nsString& aPath,
+                          uint32_t aAttributes) {
+  PRFileDesc* file;
+  nsresult rv =
+      OpenFile(aPath, PR_RDONLY | PR_CREATE_FILE | PR_APPEND | PR_EXCL,
+               aAttributes, false, &file);
+  if (file) {
+    PR_Close(file);
+  }
+
+  if (rv == NS_ERROR_FILE_ACCESS_DENIED) {
+    // need to return already-exists for directories (bug 452217)
+    bool isdir;
+    if (NS_SUCCEEDED(aFile->IsDirectory(&isdir)) && isdir) {
+      rv = NS_ERROR_FILE_ALREADY_EXISTS;
+    }
+  }
+  return rv;
+}
+
+static nsresult do_mkdir(nsIFile*, const nsString& aPath, uint32_t) {
+  if (!::CreateDirectoryW(aPath.get(), nullptr)) {
+    return ConvertWinError(GetLastError());
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Create(uint32_t aType, uint32_t aAttributes, bool aSkipAncestors) {
+  if (aType != NORMAL_FILE_TYPE && aType != DIRECTORY_TYPE) {
+    return NS_ERROR_FILE_UNKNOWN_TYPE;
+  }
+
+  auto* createFunc = (aType == NORMAL_FILE_TYPE ? do_create : do_mkdir);
+
+  nsresult rv = createFunc(this, mWorkingPath, aAttributes);
+
+  if (NS_SUCCEEDED(rv) || NS_ERROR_FILE_ALREADY_EXISTS == rv ||
+      aSkipAncestors) {
+    return rv;
+  }
+
+  // create directories to target
+  //
+  // A given local file can be either one of these forms:
+  //
+  //   - normal:    X:\some\path\on\this\drive
+  //                       ^--- start here
+  //
+  //   - UNC path:  \\machine\volume\some\path\on\this\drive
+  //                                     ^--- start here
+  //
+  // Skip the first 'X:\' for the first form, and skip the first full
+  // '\\machine\volume\' segment for the second form.
+
+  wchar_t* path = char16ptr_t(mWorkingPath.BeginWriting());
+
+  if (path[0] == L'\\' && path[1] == L'\\') {
+    // dealing with a UNC path here; skip past '\\machine\'
+    path = wcschr(path + 2, L'\\');
+    if (!path) {
+      return NS_ERROR_FILE_INVALID_PATH;
+    }
+    ++path;
+  }
+
+  // search for first slash after the drive (or volume) name
+  wchar_t* slash = wcschr(path, L'\\');
+
+  nsresult directoryCreateError = NS_OK;
+  if (slash) {
+    // skip the first '\\'
+    ++slash;
+    slash = wcschr(slash, L'\\');
+
+    while (slash) {
+      *slash = L'\0';
+
+      if (!::CreateDirectoryW(mWorkingPath.get(), nullptr)) {
+        rv = ConvertWinError(GetLastError());
+        if (NS_ERROR_FILE_NOT_FOUND == rv &&
+            NS_ERROR_FILE_ACCESS_DENIED == directoryCreateError) {
+          // If a previous CreateDirectory failed due to access, return that.
+          return NS_ERROR_FILE_ACCESS_DENIED;
+        }
+        // perhaps the base path already exists, or perhaps we don't have
+        // permissions to create the directory.  NOTE: access denied could
+        // occur on a parent directory even though it exists.
+        else if (rv != NS_ERROR_FILE_ALREADY_EXISTS &&
+                 rv != NS_ERROR_FILE_ACCESS_DENIED) {
+          return rv;
+        }
+
+        directoryCreateError = rv;
+      }
+      *slash = L'\\';
+      ++slash;
+      slash = wcschr(slash, L'\\');
+    }
+  }
+
+  // If our last CreateDirectory failed due to access, return that.
+  if (NS_ERROR_FILE_ACCESS_DENIED == directoryCreateError) {
+    return directoryCreateError;
+  }
+
+  return createFunc(this, mWorkingPath, aAttributes);
+}
+
+NS_IMETHODIMP
+nsLocalFile::Append(const nsAString& aNode) {
+  // append this path, multiple components are not permitted
+  return AppendInternal(PromiseFlatString(aNode), false);
+}
+
+NS_IMETHODIMP
+nsLocalFile::AppendRelativePath(const nsAString& aNode) {
+  // append this path, multiple components are permitted
+  return AppendInternal(PromiseFlatString(aNode), true);
+}
+
+nsresult nsLocalFile::AppendInternal(const nsString& aNode,
+                                     bool aMultipleComponents) {
+  if (aNode.IsEmpty()) {
+    return NS_OK;
+  }
+
+  // check the relative path for validity
+  if (aNode.First() == L'\\' ||   // can't start with an '\'
+      aNode.Contains(L'/') ||     // can't contain /
+      aNode.EqualsASCII("..")) {  // can't be ..
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  if (aMultipleComponents) {
+    // can't contain .. as a path component. Ensure that the valid components
+    // "foo..foo", "..foo", and "foo.." are not falsely detected,
+    // but the invalid paths "..\", "foo\..", "foo\..\foo",
+    // "..\foo", etc are.
+    constexpr auto doubleDot = u"\\.."_ns;
+    nsAString::const_iterator start, end, offset;
+    aNode.BeginReading(start);
+    aNode.EndReading(end);
+    offset = end;
+    while (FindInReadable(doubleDot, start, offset)) {
+      if (offset == end || *offset == L'\\') {
+        return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+      }
+      start = offset;
+      offset = end;
+    }
+
+    // catches the remaining cases of prefixes
+    if (StringBeginsWith(aNode, u"..\\"_ns)) {
+      return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+    }
+  }
+  // single components can't contain '\'
+  else if (aNode.Contains(L'\\')) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  MakeDirty();
+
+  mWorkingPath.Append('\\');
+  mWorkingPath.Append(aNode);
+
+  if (IsSpecialNTFSPath(mWorkingPath)) {
+    // Revert changes to mWorkingPath:
+    mWorkingPath.SetLength(mWorkingPath.Length() - aNode.Length() - 1);
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  return NS_OK;
+}
+
+nsresult nsLocalFile::OpenNSPRFileDescMaybeShareDelete(int32_t aFlags,
+                                                       int32_t aMode,
+                                                       bool aShareDelete,
+                                                       PRFileDesc** aResult) {
+  return OpenFile(mWorkingPath, aFlags, aMode, aShareDelete, aResult);
+}
+
+#define TOUPPER(u) (((u) >= L'a' && (u) <= L'z') ? (u) - (L'a' - L'A') : (u))
+
+NS_IMETHODIMP
+nsLocalFile::Normalize() {
+  // XXX See bug 187957 comment 18 for possible problems with this
+  // implementation.
+
+  if (mWorkingPath.IsEmpty()) {
+    return NS_OK;
+  }
+
+  nsAutoString path(mWorkingPath);
+
+  // find the index of the root backslash for the path. Everything before
+  // this is considered fully normalized and cannot be ascended beyond
+  // using ".."  For a local drive this is the first slash (e.g. "c:\").
+  // For a UNC path it is the slash following the share name
+  // (e.g. "\\server\share\").
+  int32_t rootIdx = 2;                  // default to local drive
+  if (path.First() == L'\\') {          // if a share then calculate the rootIdx
+    rootIdx = path.FindChar(L'\\', 2);  // skip \\ in front of the server
+    if (rootIdx == kNotFound) {
+      return NS_OK;  // already normalized
+    }
+    rootIdx = path.FindChar(L'\\', rootIdx + 1);
+    if (rootIdx == kNotFound) {
+      return NS_OK;  // already normalized
+    }
+  } else if (path.CharAt(rootIdx) != L'\\') {
+    // The path has been specified relative to the current working directory
+    // for that drive. To normalize it, the current working directory for
+    // that drive needs to be inserted before the supplied relative path
+    // which will provide an absolute path (and the rootIdx will still be 2).
+    WCHAR cwd[MAX_PATH];
+    WCHAR* pcwd = cwd;
+    int drive = TOUPPER(path.First()) - 'A' + 1;
+    /* We need to worry about IPH, for details read bug 419326.
+     * _getdrives - http://msdn2.microsoft.com/en-us/library/xdhk0xd2.aspx
+     * uses a bitmask, bit 0 is 'a:'
+     * _chdrive - http://msdn2.microsoft.com/en-us/library/0d1409hb.aspx
+     * _getdcwd - http://msdn2.microsoft.com/en-us/library/7t2zk3s4.aspx
+     * take an int, 1 is 'a:'.
+     *
+     * Because of this, we need to do some math. Subtract 1 to convert from
+     * _chdrive/_getdcwd format to _getdrives drive numbering.
+     * Shift left x bits to convert from integer indexing to bitfield indexing.
+     * And of course, we need to find out if the drive is in the bitmask.
+     *
+     * If we're really unlucky, we can still lose, but only if the user
+     * manages to eject the drive between our call to _getdrives() and
+     * our *calls* to _wgetdcwd.
+     */
+    if (!((1 << (drive - 1)) & _getdrives())) {
+      return NS_ERROR_FILE_INVALID_PATH;
+    }
+    if (!_wgetdcwd(drive, pcwd, MAX_PATH)) {
+      pcwd = _wgetdcwd(drive, 0, 0);
+    }
+    if (!pcwd) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+    nsAutoString currentDir(pcwd);
+    if (pcwd != cwd) {
+      free(pcwd);
+    }
+
+    if (currentDir.Last() == '\\') {
+      path.Replace(0, 2, currentDir);
+    } else {
+      path.Replace(0, 2, currentDir + u"\\"_ns);
+    }
+  }
+
+  MOZ_ASSERT(0 < rootIdx && rootIdx < (int32_t)path.Length(),
+             "rootIdx is invalid");
+  MOZ_ASSERT(path.CharAt(rootIdx) == '\\', "rootIdx is invalid");
+
+  // if there is nothing following the root path then it is already normalized
+  if (rootIdx + 1 == (int32_t)path.Length()) {
+    return NS_OK;
+  }
+
+  // assign the root
+  const char16_t* pathBuffer = path.get();  // simplify access to the buffer
+  mWorkingPath.SetCapacity(path.Length());  // it won't ever grow longer
+  mWorkingPath.Assign(pathBuffer, rootIdx);
+
+  // Normalize the path components. The actions taken are:
+  //
+  //  "\\"    condense to single backslash
+  //  "."     remove from path
+  //  ".."    up a directory
+  //  "..."   remove from path (any number of dots > 2)
+  //
+  // The last form is something that Windows 95 and 98 supported and
+  // is a shortcut for changing up multiple directories. Windows XP
+  // and ilk ignore it in a path, as is done here.
+  int32_t len, begin, end = rootIdx;
+  while (end < (int32_t)path.Length()) {
+    // find the current segment (text between the backslashes) to
+    // be examined, this will set the following variables:
+    //  begin == index of first char in segment
+    //  end   == index 1 char after last char in segment
+    //  len   == length of segment
+    begin = end + 1;
+    end = path.FindChar('\\', begin);
+    if (end == kNotFound) {
+      end = path.Length();
+    }
+    len = end - begin;
+
+    // ignore double backslashes
+    if (len == 0) {
+      continue;
+    }
+
+    // len != 0, and interesting paths always begin with a dot
+    if (pathBuffer[begin] == '.') {
+      // ignore single dots
+      if (len == 1) {
+        continue;
+      }
+
+      // handle multiple dots
+      if (len >= 2 && pathBuffer[begin + 1] == L'.') {
+        // back up a path component on double dot
+        if (len == 2) {
+          int32_t prev = mWorkingPath.RFindChar('\\');
+          if (prev >= rootIdx) {
+            mWorkingPath.Truncate(prev);
+          }
+          continue;
+        }
+
+        // length is > 2 and the first two characters are dots.
+        // if the rest of the string is dots, then ignore it.
+        int idx = len - 1;
+        for (; idx >= 2; --idx) {
+          if (pathBuffer[begin + idx] != L'.') {
+            break;
+          }
+        }
+
+        // this is true if the loop above didn't break
+        // and all characters in this segment are dots.
+        if (idx < 2) {
+          continue;
+        }
+      }
+    }
+
+    // add the current component to the path, including the preceding backslash
+    mWorkingPath.Append(pathBuffer + begin - 1, len + 1);
+  }
+
+  // kill trailing dots and spaces.
+  int32_t filePathLen = mWorkingPath.Length() - 1;
+  while (filePathLen > 0 && (mWorkingPath[filePathLen] == L' ' ||
+                             mWorkingPath[filePathLen] == L'.')) {
+    mWorkingPath.Truncate(filePathLen--);
+  }
+
+  MakeDirty();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetLeafName(nsAString& aLeafName) {
+  aLeafName.Truncate();
+
+  if (mWorkingPath.IsEmpty()) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  int32_t offset = mWorkingPath.RFindChar(L'\\');
+
+  // if the working path is just a node without any lashes.
+  if (offset == kNotFound) {
+    aLeafName = mWorkingPath;
+  } else {
+    aLeafName = Substring(mWorkingPath, offset + 1);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetLeafName(const nsAString& aLeafName) {
+  MakeDirty();
+
+  if (mWorkingPath.IsEmpty()) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  // cannot use nsCString::RFindChar() due to 0x5c problem
+  int32_t offset = mWorkingPath.RFindChar(L'\\');
+  nsString newDir;
+  if (offset) {
+    newDir = Substring(mWorkingPath, 0, offset + 1) + aLeafName;
+  } else {
+    newDir = mWorkingPath + aLeafName;
+  }
+  if (IsSpecialNTFSPath(newDir)) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  mWorkingPath.Assign(newDir);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetDisplayName(nsAString& aLeafName) {
+  aLeafName.Truncate();
+
+  if (mWorkingPath.IsEmpty()) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+  SHFILEINFOW sfi = {};
+  DWORD_PTR result = ::SHGetFileInfoW(mWorkingPath.get(), 0, &sfi, sizeof(sfi),
+                                      SHGFI_DISPLAYNAME);
+  // If we found a display name, return that:
+  if (result) {
+    aLeafName.Assign(sfi.szDisplayName);
+    return NS_OK;
+  }
+  // Nope - fall back to the regular leaf name.
+  return GetLeafName(aLeafName);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetPath(nsAString& aResult) {
+  MOZ_ASSERT_IF(
+      mUseDOSDevicePathSyntax,
+      !FilePreferences::StartsWithDiskDesignatorAndBackslash(mWorkingPath));
+  aResult = mWorkingPath;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetCanonicalPath(nsAString& aResult) {
+  EnsureShortPath();
+  aResult.Assign(mShortWorkingPath);
+  return NS_OK;
+}
+
+typedef struct {
+  WORD wLanguage;
+  WORD wCodePage;
+} LANGANDCODEPAGE;
+
+NS_IMETHODIMP
+nsLocalFile::GetVersionInfoField(const char* aField, nsAString& aResult) {
+  nsresult rv = NS_ERROR_FAILURE;
+
+  const WCHAR* path = mWorkingPath.get();
+
+  DWORD dummy;
+  DWORD size = ::GetFileVersionInfoSizeW(path, &dummy);
+  if (!size) {
+    return rv;
+  }
+
+  void* ver = moz_xcalloc(size, 1);
+  if (::GetFileVersionInfoW(path, 0, size, ver)) {
+    LANGANDCODEPAGE* translate = nullptr;
+    UINT pageCount;
+    BOOL queryResult = ::VerQueryValueW(ver, L"\\VarFileInfo\\Translation",
+                                        (void**)&translate, &pageCount);
+    if (queryResult && translate) {
+      for (int32_t i = 0; i < 2; ++i) {
+        wchar_t subBlock[MAX_PATH];
+        _snwprintf(subBlock, MAX_PATH, L"\\StringFileInfo\\%04x%04x\\%S",
+                   (i == 0 ? translate[0].wLanguage : ::GetUserDefaultLangID()),
+                   translate[0].wCodePage, aField);
+        subBlock[MAX_PATH - 1] = 0;
+        LPVOID value = nullptr;
+        UINT size;
+        queryResult = ::VerQueryValueW(ver, subBlock, &value, &size);
+        if (queryResult && value) {
+          aResult.Assign(static_cast<char16_t*>(value));
+          if (!aResult.IsEmpty()) {
+            rv = NS_OK;
+            break;
+          }
+        }
+      }
+    }
+  }
+  free(ver);
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::OpenNSPRFileDescShareDelete(int32_t aFlags, int32_t aMode,
+                                         PRFileDesc** aResult) {
+  nsresult rv = OpenNSPRFileDescMaybeShareDelete(aFlags, aMode, true, aResult);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+/**
+ * Determines if the drive type for the specified file is rmeote or local.
+ *
+ * @param path   The path of the file to check
+ * @param remote Out parameter, on function success holds true if the specified
+ *               file path is remote, or false if the file path is local.
+ * @return true  on success. The return value implies absolutely nothing about
+ *               wether the file is local or remote.
+ */
+static bool IsRemoteFilePath(LPCWSTR aPath, bool& aRemote) {
+  // Obtain the parent directory path and make sure it ends with
+  // a trailing backslash.
+  WCHAR dirPath[MAX_PATH + 1] = {0};
+  wcsncpy(dirPath, aPath, MAX_PATH);
+  if (!PathRemoveFileSpecW(dirPath)) {
+    return false;
+  }
+  size_t len = wcslen(dirPath);
+  // In case the dirPath holds exaclty MAX_PATH and remains unchanged, we
+  // recheck the required length here since we need to terminate it with
+  // a backslash.
+  if (len >= MAX_PATH) {
+    return false;
+  }
+
+  dirPath[len] = L'\\';
+  dirPath[len + 1] = L'\0';
+  UINT driveType = GetDriveTypeW(dirPath);
+  aRemote = driveType == DRIVE_REMOTE;
+  return true;
+}
+
+nsresult nsLocalFile::CopySingleFile(nsIFile* aSourceFile, nsIFile* aDestParent,
+                                     const nsAString& aNewName,
+                                     uint32_t aOptions) {
+  nsresult rv = NS_OK;
+  nsAutoString filePath;
+
+  bool move = aOptions & (Move | Rename);
+
+  // get the path that we are going to copy to.
+  // Since windows does not know how to auto
+  // resolve shortcuts, we must work with the
+  // target.
+  nsAutoString destPath;
+  rv = aDestParent->GetTarget(destPath);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  destPath.Append('\\');
+
+  if (aNewName.IsEmpty()) {
+    nsAutoString aFileName;
+    aSourceFile->GetLeafName(aFileName);
+    destPath.Append(aFileName);
+  } else {
+    destPath.Append(aNewName);
+  }
+
+  if (aOptions & FollowSymlinks) {
+    rv = aSourceFile->GetTarget(filePath);
+    if (filePath.IsEmpty()) {
+      rv = aSourceFile->GetPath(filePath);
+    }
+  } else {
+    rv = aSourceFile->GetPath(filePath);
+  }
+
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+#ifdef DEBUG
+  nsCOMPtr<nsILocalFileWin> srcWinFile = do_QueryInterface(aSourceFile);
+  MOZ_ASSERT(srcWinFile);
+
+  bool srcUseDOSDevicePathSyntax;
+  srcWinFile->GetUseDOSDevicePathSyntax(&srcUseDOSDevicePathSyntax);
+
+  nsCOMPtr<nsILocalFileWin> destWinFile = do_QueryInterface(aDestParent);
+  MOZ_ASSERT(destWinFile);
+
+  bool destUseDOSDevicePathSyntax;
+  destWinFile->GetUseDOSDevicePathSyntax(&destUseDOSDevicePathSyntax);
+
+  MOZ_ASSERT(srcUseDOSDevicePathSyntax == destUseDOSDevicePathSyntax,
+             "Copy or Move files with different values for "
+             "useDOSDevicePathSyntax would fail");
+#endif
+
+  if (FilePreferences::IsBlockedUNCPath(destPath)) {
+    return NS_ERROR_FILE_ACCESS_DENIED;
+  }
+
+  int copyOK = 0;
+  if (move) {
+    copyOK = ::MoveFileExW(filePath.get(), destPath.get(),
+                           MOVEFILE_REPLACE_EXISTING);
+  }
+
+  // If we either failed to move the file, or this is a copy, try copying:
+  if (!copyOK && (!move || GetLastError() == ERROR_NOT_SAME_DEVICE)) {
+    // Failed renames here should just return access denied.
+    if (move && (aOptions & Rename)) {
+      return NS_ERROR_FILE_ACCESS_DENIED;
+    }
+
+    // Pass the flag COPY_FILE_NO_BUFFERING to CopyFileEx as we may be copying
+    // to a SMBV2 remote drive. Without this parameter subsequent append mode
+    // file writes can cause the resultant file to become corrupt. We only need
+    // to do this if the major version of Windows is > 5(Only Windows Vista and
+    // above can support SMBV2).  With a 7200RPM hard drive: Copying a 1KB file
+    // with COPY_FILE_NO_BUFFERING takes about 30-60ms. Copying a 1KB file
+    // without COPY_FILE_NO_BUFFERING takes < 1ms. So we only use
+    // COPY_FILE_NO_BUFFERING when we have a remote drive.
+    DWORD dwCopyFlags = COPY_FILE_ALLOW_DECRYPTED_DESTINATION;
+    bool path1Remote, path2Remote;
+    if (!IsRemoteFilePath(filePath.get(), path1Remote) ||
+        !IsRemoteFilePath(destPath.get(), path2Remote) || path1Remote ||
+        path2Remote) {
+      dwCopyFlags |= COPY_FILE_NO_BUFFERING;
+    }
+
+    copyOK = ::CopyFileExW(filePath.get(), destPath.get(), nullptr, nullptr,
+                           nullptr, dwCopyFlags);
+    // On Windows 10, copying without buffering has started failing, so try
+    // with buffering...
+    if (!copyOK && (dwCopyFlags & COPY_FILE_NO_BUFFERING) &&
+        GetLastError() == ERROR_INVALID_PARAMETER) {
+      dwCopyFlags &= ~COPY_FILE_NO_BUFFERING;
+      copyOK = ::CopyFileExW(filePath.get(), destPath.get(), nullptr, nullptr,
+                             nullptr, dwCopyFlags);
+    }
+
+    if (move && copyOK) {
+      DeleteFileW(filePath.get());
+    }
+  }
+
+  if (!copyOK) {  // CopyFileEx and MoveFileEx return zero at failure.
+    rv = ConvertWinError(GetLastError());
+  } else if (move && !(aOptions & SkipNtfsAclReset)) {
+    // Set security permissions to inherit from parent.
+    // Note: propagates to all children: slow for big file trees
+    PACL pOldDACL = nullptr;
+    PSECURITY_DESCRIPTOR pSD = nullptr;
+    ::GetNamedSecurityInfoW((LPWSTR)destPath.get(), SE_FILE_OBJECT,
+                            DACL_SECURITY_INFORMATION, nullptr, nullptr,
+                            &pOldDACL, nullptr, &pSD);
+    UniquePtr<VOID, LocalFreeDeleter> autoFreeSecDesc(pSD);
+    if (pOldDACL) {
+      // Test the current DACL, if we find one that is inherited then we can
+      // skip the reset. This avoids a request for SeTcbPrivilege, which can
+      // cause a lot of audit events if enabled (Bug 1816694).
+      bool inherited = false;
+      for (DWORD i = 0; i < pOldDACL->AceCount; ++i) {
+        VOID* pAce = nullptr;
+        if (::GetAce(pOldDACL, i, &pAce) &&
+            static_cast<PACE_HEADER>(pAce)->AceFlags & INHERITED_ACE) {
+          inherited = true;
+          break;
+        }
+      }
+
+      if (!inherited) {
+        ::SetNamedSecurityInfoW(
+            (LPWSTR)destPath.get(), SE_FILE_OBJECT,
+            DACL_SECURITY_INFORMATION | UNPROTECTED_DACL_SECURITY_INFORMATION,
+            nullptr, nullptr, pOldDACL, nullptr);
+      }
+    }
+  }
+
+  return rv;
+}
+
+nsresult nsLocalFile::CopyMove(nsIFile* aParentDir, const nsAString& aNewName,
+                               uint32_t aOptions) {
+  bool move = aOptions & (Move | Rename);
+  bool followSymlinks = aOptions & FollowSymlinks;
+  // If we're not provided with a new parent, we're copying or moving to
+  // another file in the same directory and can safely skip checking if the
+  // destination directory exists:
+  bool targetInSameDirectory = !aParentDir;
+
+  nsCOMPtr<nsIFile> newParentDir = aParentDir;
+  // check to see if this exists, otherwise return an error.
+  // we will check this by resolving.  If the user wants us
+  // to follow links, then we are talking about the target,
+  // hence we can use the |FollowSymlinks| option.
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (!newParentDir) {
+    // no parent was specified.  We must rename.
+    if (aNewName.IsEmpty()) {
+      return NS_ERROR_INVALID_ARG;
+    }
+
+    rv = GetParent(getter_AddRefs(newParentDir));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  if (!newParentDir) {
+    return NS_ERROR_FILE_DESTINATION_NOT_DIR;
+  }
+
+  if (!targetInSameDirectory) {
+    // make sure it exists and is a directory.  Create it if not there.
+    bool exists = false;
+    rv = newParentDir->Exists(&exists);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    if (!exists) {
+      rv = newParentDir->Create(DIRECTORY_TYPE,
+                                0644);  // TODO, what permissions should we use
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    } else {
+      bool isDir = false;
+      rv = newParentDir->IsDirectory(&isDir);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      if (!isDir) {
+        if (followSymlinks) {
+          bool isLink = false;
+          rv = newParentDir->IsSymlink(&isLink);
+          if (NS_FAILED(rv)) {
+            return rv;
+          }
+
+          if (isLink) {
+            nsAutoString target;
+            rv = newParentDir->GetTarget(target);
+            if (NS_FAILED(rv)) {
+              return rv;
+            }
+
+            nsCOMPtr<nsIFile> realDest = new nsLocalFile();
+            rv = realDest->InitWithPath(target);
+            if (NS_FAILED(rv)) {
+              return rv;
+            }
+
+            return CopyMove(realDest, aNewName, aOptions);
+          }
+        } else {
+          return NS_ERROR_FILE_DESTINATION_NOT_DIR;
+        }
+      }
+    }
+  }
+
+  // Try different ways to move/copy files/directories
+  bool done = false;
+
+  bool isDir = false;
+  rv = IsDirectory(&isDir);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  bool isSymlink = false;
+  rv = IsSymlink(&isSymlink);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // Try to move the file or directory, or try to copy a single file (or
+  // non-followed symlink)
+  if (move || !isDir || (isSymlink && !followSymlinks)) {
+    // Copy/Move single file, or move a directory
+    if (!aParentDir) {
+      aOptions |= SkipNtfsAclReset;
+    }
+    rv = CopySingleFile(this, newParentDir, aNewName, aOptions);
+    done = NS_SUCCEEDED(rv);
+    // If we are moving a directory and that fails, fallback on directory
+    // enumeration.  See bug 231300 for details.
+    if (!done && !(move && isDir)) {
+      return rv;
+    }
+  }
+
+  // Not able to copy or move directly, so enumerate it
+  if (!done) {
+    // create a new target destination in the new parentDir;
+    nsCOMPtr<nsIFile> target;
+    rv = newParentDir->Clone(getter_AddRefs(target));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    nsAutoString allocatedNewName;
+    if (aNewName.IsEmpty()) {
+      bool isLink = false;
+      rv = IsSymlink(&isLink);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      if (isLink) {
+        nsAutoString temp;
+        rv = GetTarget(temp);
+        if (NS_FAILED(rv)) {
+          return rv;
+        }
+
+        int32_t offset = temp.RFindChar(L'\\');
+        if (offset == kNotFound) {
+          allocatedNewName = temp;
+        } else {
+          allocatedNewName = Substring(temp, offset + 1);
+        }
+      } else {
+        GetLeafName(allocatedNewName);  // this should be the leaf name of the
+      }
+    } else {
+      allocatedNewName = aNewName;
+    }
+
+    rv = target->Append(allocatedNewName);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    allocatedNewName.Truncate();
+
+    bool exists = false;
+    // check if the destination directory already exists
+    rv = target->Exists(&exists);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    if (!exists) {
+      // if the destination directory cannot be created, return an error
+      rv = target->Create(DIRECTORY_TYPE,
+                          0644);  // TODO, what permissions should we use
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    } else {
+      // check if the destination directory is writable and empty
+      bool isWritable = false;
+      rv = target->IsWritable(&isWritable);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      if (!isWritable) {
+        return NS_ERROR_FILE_ACCESS_DENIED;
+      }
+
+      nsCOMPtr<nsIDirectoryEnumerator> targetIterator;
+      rv = target->GetDirectoryEntries(getter_AddRefs(targetIterator));
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      bool more;
+      targetIterator->HasMoreElements(&more);
+      // return error if target directory is not empty
+      if (more) {
+        return NS_ERROR_FILE_DIR_NOT_EMPTY;
+      }
+    }
+
+    RefPtr<nsDirEnumerator> dirEnum = new nsDirEnumerator();
+
+    rv = dirEnum->Init(this);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("dirEnum initialization failed");
+      return rv;
+    }
+
+    nsCOMPtr<nsIFile> file;
+    while (NS_SUCCEEDED(dirEnum->GetNextFile(getter_AddRefs(file))) && file) {
+      bool isDir = false;
+      rv = file->IsDirectory(&isDir);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      bool isLink = false;
+      rv = file->IsSymlink(&isLink);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      if (move) {
+        if (followSymlinks) {
+          return NS_ERROR_FAILURE;
+        }
+
+        rv = file->MoveTo(target, u""_ns);
+        if (NS_FAILED(rv)) {
+          return rv;
+        }
+      } else {
+        if (followSymlinks) {
+          rv = file->CopyToFollowingLinks(target, u""_ns);
+        } else {
+          rv = file->CopyTo(target, u""_ns);
+        }
+        if (NS_FAILED(rv)) {
+          return rv;
+        }
+      }
+    }
+    // we've finished moving all the children of this directory
+    // in the new directory.  so now delete the directory
+    // note, we don't need to do a recursive delete.
+    // MoveTo() is recursive.  At this point,
+    // we've already moved the children of the current folder
+    // to the new location.  nothing should be left in the folder.
+    if (move) {
+      rv = Remove(false /* recursive */);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    }
+  }
+
+  // If we moved, we want to adjust this.
+  if (move) {
+    MakeDirty();
+
+    nsAutoString newParentPath;
+    newParentDir->GetPath(newParentPath);
+
+    if (newParentPath.IsEmpty()) {
+      return NS_ERROR_FAILURE;
+    }
+
+    if (aNewName.IsEmpty()) {
+      nsAutoString aFileName;
+      GetLeafName(aFileName);
+
+      InitWithPath(newParentPath);
+      Append(aFileName);
+    } else {
+      InitWithPath(newParentPath);
+      Append(aNewName);
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::CopyTo(nsIFile* aNewParentDir, const nsAString& aNewName) {
+  return CopyMove(aNewParentDir, aNewName, 0);
+}
+
+NS_IMETHODIMP
+nsLocalFile::CopyToFollowingLinks(nsIFile* aNewParentDir,
+                                  const nsAString& aNewName) {
+  return CopyMove(aNewParentDir, aNewName, FollowSymlinks);
+}
+
+NS_IMETHODIMP
+nsLocalFile::MoveTo(nsIFile* aNewParentDir, const nsAString& aNewName) {
+  return CopyMove(aNewParentDir, aNewName, Move);
+}
+
+NS_IMETHODIMP
+nsLocalFile::MoveToFollowingLinks(nsIFile* aNewParentDir,
+                                  const nsAString& aNewName) {
+  return CopyMove(aNewParentDir, aNewName, Move | FollowSymlinks);
+}
+
+NS_IMETHODIMP
+nsLocalFile::RenameTo(nsIFile* aNewParentDir, const nsAString& aNewName) {
+  // If we're not provided with a new parent, we're renaming inside one and
+  // the same directory and can safely skip checking if the destination
+  // directory exists:
+  bool targetInSameDirectory = !aNewParentDir;
+
+  nsCOMPtr<nsIFile> targetParentDir = aNewParentDir;
+  // check to see if this exists, otherwise return an error.
+  // we will check this by resolving.  If the user wants us
+  // to follow links, then we are talking about the target,
+  // hence we can use the |followSymlinks| parameter.
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (!targetParentDir) {
+    // no parent was specified.  We must rename.
+    if (aNewName.IsEmpty()) {
+      return NS_ERROR_INVALID_ARG;
+    }
+    rv = GetParent(getter_AddRefs(targetParentDir));
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  if (!targetParentDir) {
+    return NS_ERROR_FILE_DESTINATION_NOT_DIR;
+  }
+
+  if (!targetInSameDirectory) {
+    // make sure it exists and is a directory.  Create it if not there.
+    bool exists = false;
+    rv = targetParentDir->Exists(&exists);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+
+    if (!exists) {
+      rv = targetParentDir->Create(DIRECTORY_TYPE, 0644);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+    } else {
+      bool isDir = false;
+      rv = targetParentDir->IsDirectory(&isDir);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+      if (!isDir) {
+        return NS_ERROR_FILE_DESTINATION_NOT_DIR;
+      }
+    }
+  }
+
+  uint32_t options = Rename;
+  if (!aNewParentDir) {
+    options |= SkipNtfsAclReset;
+  }
+  // Move single file, or move a directory
+  return CopySingleFile(this, targetParentDir, aNewName, options);
+}
+
+NS_IMETHODIMP
+nsLocalFile::RenameToNative(nsIFile* aNewParentDir,
+                            const nsACString& aNewName) {
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNewName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return RenameTo(aNewParentDir, tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Load(PRLibrary** aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+  nsTraceRefcnt::SetActivityIsLegal(false);
+#endif
+
+  PRLibSpec libSpec;
+  libSpec.value.pathname_u = mWorkingPath.get();
+  libSpec.type = PR_LibSpec_PathnameU;
+  *aResult = PR_LoadLibraryWithFlags(libSpec, 0);
+
+#ifdef NS_BUILD_REFCNT_LOGGING
+  nsTraceRefcnt::SetActivityIsLegal(true);
+#endif
+
+  if (*aResult) {
+    return NS_OK;
+  }
+  return NS_ERROR_NULL_POINTER;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Remove(bool aRecursive, uint32_t* aRemoveCount) {
+  // NOTE:
+  //
+  // if the working path points to a shortcut, then we will only
+  // delete the shortcut itself.  even if the shortcut points to
+  // a directory, we will not recurse into that directory or
+  // delete that directory itself.  likewise, if the shortcut
+  // points to a normal file, we will not delete the real file.
+  // this is done to be consistent with the other platforms that
+  // behave this way.  we do this even if the followLinks attribute
+  // is set to true.  this helps protect against misuse that could
+  // lead to security bugs (e.g., bug 210588).
+  //
+  // Since shortcut files are no longer permitted to be used as unix-like
+  // symlinks interspersed in the path (e.g. "c:/file.lnk/foo/bar.txt")
+  // this processing is a lot simpler. Even if the shortcut file is
+  // pointing to a directory, only the mWorkingPath value is used and so
+  // only the shortcut file will be deleted.
+
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  nsresult rv = NS_OK;
+
+  bool isLink = false;
+  rv = IsSymlink(&isLink);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // only check to see if we have a directory if it isn't a link
+  bool isDir = false;
+  if (!isLink) {
+    rv = IsDirectory(&isDir);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  if (isDir) {
+    if (aRecursive) {
+      // WARNING: neither the `SHFileOperation` nor `IFileOperation` APIs are
+      // appropriate here as neither handle long path names, i.e. paths prefixed
+      // with `\\?\` or longer than 260 characters on Windows 10+ system with
+      // long paths enabled.
+
+      RefPtr<nsDirEnumerator> dirEnum = new nsDirEnumerator();
+
+      rv = dirEnum->Init(this);
+      if (NS_FAILED(rv)) {
+        return rv;
+      }
+
+      // XXX: We are ignoring the result of the removal here while
+      // nsLocalFileUnix does not. We should align the behavior. (bug 1779696)
+      nsCOMPtr<nsIFile> file;
+      while (NS_SUCCEEDED(dirEnum->GetNextFile(getter_AddRefs(file))) && file) {
+        file->Remove(aRecursive, aRemoveCount);
+      }
+    }
+    if (RemoveDirectoryW(mWorkingPath.get()) == 0) {
+      return ConvertWinError(GetLastError());
+    }
+  } else {
+    if (DeleteFileW(mWorkingPath.get()) == 0) {
+      return ConvertWinError(GetLastError());
+    }
+  }
+
+  if (aRemoveCount) {
+    *aRemoveCount += 1;
+  }
+
+  MakeDirty();
+  return rv;
+}
+
+nsresult nsLocalFile::GetDateImpl(PRTime* aTime,
+                                  nsLocalFile::TimeField aTimeField,
+                                  bool aFollowLinks) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aTime)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  FileInfo symlinkInfo{};
+  FileInfo* pInfo;
+
+  if (aFollowLinks) {
+    if (nsresult rv = GetFileInfo(mWorkingPath, &symlinkInfo); NS_FAILED(rv)) {
+      return rv;
+    }
+
+    pInfo = &symlinkInfo;
+  } else {
+    if (nsresult rv = ResolveAndStat(); NS_FAILED(rv)) {
+      return rv;
+    }
+
+    pInfo = &mFileInfo;
+  }
+
+  switch (aTimeField) {
+    case TimeField::AccessedTime:
+      *aTime = pInfo->accessTime / PR_USEC_PER_MSEC;
+      break;
+
+    case TimeField::ModifiedTime:
+      *aTime = pInfo->modifyTime / PR_USEC_PER_MSEC;
+      break;
+
+    default:
+      MOZ_CRASH("Unknown time field");
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetLastAccessedTime(PRTime* aLastAccessedTime) {
+  return GetDateImpl(aLastAccessedTime, TimeField::AccessedTime,
+                     /* aFollowSymlinks = */ true);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetLastAccessedTimeOfLink(PRTime* aLastAccessedTime) {
+  return GetDateImpl(aLastAccessedTime, TimeField::AccessedTime,
+                     /* aFollowSymlinks = */ false);
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetLastAccessedTime(PRTime aLastAccessedTime) {
+  return SetDateImpl(aLastAccessedTime, TimeField::AccessedTime);
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetLastAccessedTimeOfLink(PRTime aLastAccessedTime) {
+  return SetLastAccessedTime(aLastAccessedTime);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetLastModifiedTime(PRTime* aLastModifiedTime) {
+  return GetDateImpl(aLastModifiedTime, TimeField::ModifiedTime,
+                     /* aFollowSymlinks = */ true);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetLastModifiedTimeOfLink(PRTime* aLastModifiedTime) {
+  return GetDateImpl(aLastModifiedTime, TimeField::ModifiedTime,
+                     /* aFollowSymlinks = */ false);
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetLastModifiedTime(PRTime aLastModifiedTime) {
+  return SetDateImpl(aLastModifiedTime, TimeField::ModifiedTime);
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetLastModifiedTimeOfLink(PRTime aLastModifiedTime) {
+  return SetLastModifiedTime(aLastModifiedTime);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetCreationTime(PRTime* aCreationTime) {
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aCreationTime)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult rv = ResolveAndStat();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aCreationTime = mFileInfo.creationTime / PR_USEC_PER_MSEC;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetCreationTimeOfLink(PRTime* aCreationTime) {
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aCreationTime)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  FileInfo info;
+  nsresult rv = GetFileInfo(mWorkingPath, &info);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aCreationTime = info.creationTime / PR_USEC_PER_MSEC;
+
+  return NS_OK;
+}
+
+nsresult nsLocalFile::SetDateImpl(PRTime aTime,
+                                  nsLocalFile::TimeField aTimeField) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  // The FILE_FLAG_BACKUP_SEMANTICS is required in order to change the
+  // modification time for directories.
+  HANDLE file =
+      ::CreateFileW(mWorkingPath.get(),  // pointer to name of the file
+                    GENERIC_WRITE,       // access (write) mode
+                    0,                   // share mode
+                    nullptr,             // pointer to security attributes
+                    OPEN_EXISTING,       // how to create
+                    FILE_FLAG_BACKUP_SEMANTICS,  // file attributes
+                    nullptr);
+
+  if (file == INVALID_HANDLE_VALUE) {
+    return ConvertWinError(GetLastError());
+  }
+
+  FILETIME ft;
+  SYSTEMTIME st;
+  PRExplodedTime pret;
+
+  if (aTime == 0) {
+    aTime = PR_Now() / PR_USEC_PER_MSEC;
+  }
+
+  // PR_ExplodeTime expects usecs...
+  PR_ExplodeTime(aTime * PR_USEC_PER_MSEC, PR_GMTParameters, &pret);
+  st.wYear = pret.tm_year;
+  st.wMonth =
+      pret.tm_month + 1;  // Convert start offset -- Win32: Jan=1; NSPR: Jan=0
+  st.wDayOfWeek = pret.tm_wday;
+  st.wDay = pret.tm_mday;
+  st.wHour = pret.tm_hour;
+  st.wMinute = pret.tm_min;
+  st.wSecond = pret.tm_sec;
+  st.wMilliseconds = pret.tm_usec / 1000;
+
+  const FILETIME* accessTime = nullptr;
+  const FILETIME* modifiedTime = nullptr;
+
+  if (aTimeField == TimeField::AccessedTime) {
+    accessTime = &ft;
+  } else {
+    modifiedTime = &ft;
+  }
+
+  nsresult rv = NS_OK;
+
+  // if at least one of these fails...
+  if (!(SystemTimeToFileTime(&st, &ft) != 0 &&
+        SetFileTime(file, nullptr, accessTime, modifiedTime) != 0)) {
+    rv = ConvertWinError(GetLastError());
+  }
+
+  CloseHandle(file);
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetPermissions(uint32_t* aPermissions) {
+  if (NS_WARN_IF(!aPermissions)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // get the permissions of the target as determined by mFollowSymlinks
+  // If true, then this will be for the target of the shortcut file,
+  // otherwise it will be for the shortcut file itself (i.e. the same
+  // results as GetPermissionsOfLink)
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  bool isWritable = false;
+  rv = IsWritable(&isWritable);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  bool isExecutable = false;
+  rv = IsExecutable(&isExecutable);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  *aPermissions = PR_IRUSR | PR_IRGRP | PR_IROTH;  // all read
+  if (isWritable) {
+    *aPermissions |= PR_IWUSR | PR_IWGRP | PR_IWOTH;  // all write
+  }
+  if (isExecutable) {
+    *aPermissions |= PR_IXUSR | PR_IXGRP | PR_IXOTH;  // all execute
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetPermissionsOfLink(uint32_t* aPermissions) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aPermissions)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // The caller is assumed to have already called IsSymlink
+  // and to have found that this file is a link. It is not
+  // possible for a link file to be executable.
+
+  DWORD word = ::GetFileAttributesW(mWorkingPath.get());
+  if (word == INVALID_FILE_ATTRIBUTES) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  bool isWritable = !(word & FILE_ATTRIBUTE_READONLY);
+  *aPermissions = PR_IRUSR | PR_IRGRP | PR_IROTH;  // all read
+  if (isWritable) {
+    *aPermissions |= PR_IWUSR | PR_IWGRP | PR_IWOTH;  // all write
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetPermissions(uint32_t aPermissions) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  // set the permissions of the target as determined by mFollowSymlinks
+  // If true, then this will be for the target of the shortcut file,
+  // otherwise it will be for the shortcut file itself (i.e. the same
+  // results as SetPermissionsOfLink)
+  nsresult rv = Resolve();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  // windows only knows about the following permissions
+  int mode = 0;
+  if (aPermissions & (PR_IRUSR | PR_IRGRP | PR_IROTH)) {  // any read
+    mode |= _S_IREAD;
+  }
+  if (aPermissions & (PR_IWUSR | PR_IWGRP | PR_IWOTH)) {  // any write
+    mode |= _S_IWRITE;
+  }
+
+  if (_wchmod(mResolvedPath.get(), mode) == -1) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetPermissionsOfLink(uint32_t aPermissions) {
+  // The caller is assumed to have already called IsSymlink
+  // and to have found that this file is a link.
+
+  // windows only knows about the following permissions
+  int mode = 0;
+  if (aPermissions & (PR_IRUSR | PR_IRGRP | PR_IROTH)) {  // any read
+    mode |= _S_IREAD;
+  }
+  if (aPermissions & (PR_IWUSR | PR_IWGRP | PR_IWOTH)) {  // any write
+    mode |= _S_IWRITE;
+  }
+
+  if (_wchmod(mWorkingPath.get(), mode) == -1) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetFileSize(int64_t* aFileSize) {
+  if (NS_WARN_IF(!aFileSize)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  *aFileSize = mFileInfo.size;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetFileSizeOfLink(int64_t* aFileSize) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aFileSize)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // The caller is assumed to have already called IsSymlink
+  // and to have found that this file is a link.
+
+  FileInfo info{};
+  if (NS_FAILED(GetFileInfo(mWorkingPath, &info))) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  *aFileSize = info.size;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetFileSize(int64_t aFileSize) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  HANDLE hFile =
+      ::CreateFileW(mWorkingPath.get(),     // pointer to name of the file
+                    GENERIC_WRITE,          // access (write) mode
+                    FILE_SHARE_READ,        // share mode
+                    nullptr,                // pointer to security attributes
+                    OPEN_EXISTING,          // how to create
+                    FILE_ATTRIBUTE_NORMAL,  // file attributes
+                    nullptr);
+  if (hFile == INVALID_HANDLE_VALUE) {
+    return ConvertWinError(GetLastError());
+  }
+
+  // seek the file pointer to the new, desired end of file
+  // and then truncate the file at that position
+  nsresult rv = NS_ERROR_FAILURE;
+  LARGE_INTEGER distance;
+  distance.QuadPart = aFileSize;
+  if (SetFilePointerEx(hFile, distance, nullptr, FILE_BEGIN) &&
+      SetEndOfFile(hFile)) {
+    MakeDirty();
+    rv = NS_OK;
+  }
+
+  CloseHandle(hFile);
+  return rv;
+}
+
+static nsresult GetDiskSpaceAttributes(const nsString& aResolvedPath,
+                                       int64_t* aFreeBytesAvailable,
+                                       int64_t* aTotalBytes) {
+  ULARGE_INTEGER liFreeBytesAvailableToCaller;
+  ULARGE_INTEGER liTotalNumberOfBytes;
+  if (::GetDiskFreeSpaceExW(aResolvedPath.get(), &liFreeBytesAvailableToCaller,
+                            &liTotalNumberOfBytes, nullptr)) {
+    *aFreeBytesAvailable = liFreeBytesAvailableToCaller.QuadPart;
+    *aTotalBytes = liTotalNumberOfBytes.QuadPart;
+
+    return NS_OK;
+  }
+
+  return ConvertWinError(::GetLastError());
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetDiskSpaceAvailable(int64_t* aDiskSpaceAvailable) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aDiskSpaceAvailable)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aDiskSpaceAvailable = 0;
+
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (mFileInfo.type == PR_FILE_FILE) {
+    // Since GetDiskFreeSpaceExW works only on directories, use the parent.
+    nsCOMPtr<nsIFile> parent;
+    if (NS_SUCCEEDED(GetParent(getter_AddRefs(parent))) && parent) {
+      return parent->GetDiskSpaceAvailable(aDiskSpaceAvailable);
+    }
+  }
+
+  int64_t dummy = 0;
+  return GetDiskSpaceAttributes(mResolvedPath, aDiskSpaceAvailable, &dummy);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetDiskCapacity(int64_t* aDiskCapacity) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aDiskCapacity)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  if (mFileInfo.type == PR_FILE_FILE) {
+    // Since GetDiskFreeSpaceExW works only on directories, use the parent.
+    nsCOMPtr<nsIFile> parent;
+    if (NS_SUCCEEDED(GetParent(getter_AddRefs(parent))) && parent) {
+      return parent->GetDiskCapacity(aDiskCapacity);
+    }
+  }
+
+  int64_t dummy = 0;
+  return GetDiskSpaceAttributes(mResolvedPath, &dummy, aDiskCapacity);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetParent(nsIFile** aParent) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aParent)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // A two-character path must be a drive such as C:, so it has no parent
+  if (mWorkingPath.Length() == 2) {
+    *aParent = nullptr;
+    return NS_OK;
+  }
+
+  int32_t offset = mWorkingPath.RFindChar(char16_t('\\'));
+  // adding this offset check that was removed in bug 241708 fixes mail
+  // directories that aren't relative to/underneath the profile dir.
+  // e.g., on a different drive. Before you remove them, please make
+  // sure local mail directories that aren't underneath the profile dir work.
+  if (offset == kNotFound) {
+    return NS_ERROR_FILE_UNRECOGNIZED_PATH;
+  }
+
+  // A path of the form \\NAME is a top-level path and has no parent
+  if (offset == 1 && mWorkingPath[0] == L'\\') {
+    *aParent = nullptr;
+    return NS_OK;
+  }
+
+  nsAutoString parentPath(mWorkingPath);
+
+  if (offset > 0) {
+    parentPath.Truncate(offset);
+  } else {
+    parentPath.AssignLiteral("\\\\.");
+  }
+
+  nsCOMPtr<nsIFile> localFile;
+  nsresult rv = NewLocalFile(parentPath, mUseDOSDevicePathSyntax,
+                             getter_AddRefs(localFile));
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  localFile.forget(aParent);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Exists(bool* aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  *aResult = false;
+
+  MakeDirty();
+  nsresult rv = ResolveAndStat();
+  *aResult = NS_SUCCEEDED(rv) || rv == NS_ERROR_FILE_IS_LOCKED;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsWritable(bool* aIsWritable) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  // The read-only attribute on a FAT directory only means that it can't
+  // be deleted. It is still possible to modify the contents of the directory.
+  nsresult rv = IsDirectory(aIsWritable);
+  if (rv == NS_ERROR_FILE_ACCESS_DENIED) {
+    *aIsWritable = true;
+    return NS_OK;
+  } else if (rv == NS_ERROR_FILE_IS_LOCKED) {
+    // If the file is normally allowed write access
+    // we should still return that the file is writable.
+  } else if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (*aIsWritable) {
+    return NS_OK;
+  }
+
+  // writable if the file doesn't have the readonly attribute
+  rv = HasFileAttribute(FILE_ATTRIBUTE_READONLY, aIsWritable);
+  if (rv == NS_ERROR_FILE_ACCESS_DENIED) {
+    *aIsWritable = false;
+    return NS_OK;
+  } else if (rv == NS_ERROR_FILE_IS_LOCKED) {
+    // If the file is normally allowed write access
+    // we should still return that the file is writable.
+  } else if (NS_FAILED(rv)) {
+    return rv;
+  }
+  *aIsWritable = !*aIsWritable;
+
+  // If the read only attribute is not set, check to make sure
+  // we can open the file with write access.
+  if (*aIsWritable) {
+    PRFileDesc* file;
+    rv = OpenFile(mResolvedPath, PR_WRONLY, 0, false, &file);
+    if (NS_SUCCEEDED(rv)) {
+      PR_Close(file);
+    } else if (rv == NS_ERROR_FILE_ACCESS_DENIED) {
+      *aIsWritable = false;
+    } else if (rv == NS_ERROR_FILE_IS_LOCKED) {
+      // If it is locked and read only we would have
+      // gotten access denied
+      *aIsWritable = true;
+    } else {
+      return rv;
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsReadable(bool* aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  *aResult = false;
+
+  nsresult rv = ResolveAndStat();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  *aResult = true;
+  return NS_OK;
+}
+
+nsresult nsLocalFile::LookupExtensionIn(const char* const* aExtensionsArray,
+                                        size_t aArrayLength, bool* aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  *aResult = false;
+
+  nsresult rv;
+
+  // only files can be executables
+  bool isFile;
+  rv = IsFile(&isFile);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+  if (!isFile) {
+    return NS_OK;
+  }
+
+  // TODO: shouldn't we be checking mFollowSymlinks here?
+  bool symLink = false;
+  rv = IsSymlink(&symLink);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  nsAutoString path;
+  if (symLink) {
+    GetTarget(path);
+  } else {
+    GetPath(path);
+  }
+
+  // kill trailing dots and spaces.
+  int32_t filePathLen = path.Length() - 1;
+  while (filePathLen > 0 &&
+         (path[filePathLen] == L' ' || path[filePathLen] == L'.')) {
+    path.Truncate(filePathLen--);
+  }
+
+  // Get extension.
+  int32_t dotIdx = path.RFindChar(char16_t('.'));
+  if (dotIdx != kNotFound) {
+    // Convert extension to lower case.
+    char16_t* p = path.BeginWriting();
+    for (p += dotIdx + 1; *p; ++p) {
+      *p += (*p >= L'A' && *p <= L'Z') ? 'a' - 'A' : 0;
+    }
+
+    nsDependentSubstring ext = Substring(path, dotIdx);
+    for (size_t i = 0; i < aArrayLength; ++i) {
+      if (ext.EqualsASCII(aExtensionsArray[i])) {
+        // Found a match.  Set result and quit.
+        *aResult = true;
+        break;
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsExecutable(bool* aResult) {
+  return LookupExtensionIn(sExecutableExts, ArrayLength(sExecutableExts),
+                           aResult);
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsDirectory(bool* aResult) {
+  return HasFileAttribute(FILE_ATTRIBUTE_DIRECTORY, aResult);
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsFile(bool* aResult) {
+  nsresult rv = HasFileAttribute(FILE_ATTRIBUTE_DIRECTORY, aResult);
+  if (NS_SUCCEEDED(rv)) {
+    *aResult = !*aResult;
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsHidden(bool* aResult) {
+  return HasFileAttribute(FILE_ATTRIBUTE_HIDDEN, aResult);
+}
+
+nsresult nsLocalFile::HasFileAttribute(DWORD aFileAttrib, bool* aResult) {
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsresult rv = Resolve();
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  DWORD attributes = GetFileAttributesW(mResolvedPath.get());
+  if (INVALID_FILE_ATTRIBUTES == attributes) {
+    return ConvertWinError(GetLastError());
+  }
+
+  *aResult = ((attributes & aFileAttrib) != 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsSymlink(bool* aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  // TODO: Implement symlink support
+  *aResult = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::IsSpecial(bool* aResult) {
+  return HasFileAttribute(FILE_ATTRIBUTE_SYSTEM, aResult);
+}
+
+NS_IMETHODIMP
+nsLocalFile::Equals(nsIFile* aInFile, bool* aResult) {
+  if (NS_WARN_IF(!aInFile)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+  if (NS_WARN_IF(!aResult)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  nsCOMPtr<nsILocalFileWin> lf(do_QueryInterface(aInFile));
+  if (!lf) {
+    *aResult = false;
+    return NS_OK;
+  }
+
+  bool inUseDOSDevicePathSyntax;
+  lf->GetUseDOSDevicePathSyntax(&inUseDOSDevicePathSyntax);
+
+  // If useDOSDevicePathSyntax are different remove the prefix from the one that
+  // might have it. This is added because of Omnijar. It compares files from
+  // different modules with itself.
+  bool removePathPrefix, removeInPathPrefix;
+  if (inUseDOSDevicePathSyntax != mUseDOSDevicePathSyntax) {
+    removeInPathPrefix = inUseDOSDevicePathSyntax;
+    removePathPrefix = mUseDOSDevicePathSyntax;
+  } else {
+    removePathPrefix = removeInPathPrefix = false;
+  }
+
+  nsAutoString inFilePath, workingPath;
+  aInFile->GetPath(inFilePath);
+  workingPath = mWorkingPath;
+
+  constexpr static auto equalPath =
+      [](nsAutoString& workingPath, nsAutoString& inFilePath,
+         bool removePathPrefix, bool removeInPathPrefix) {
+        if (removeInPathPrefix &&
+            StringBeginsWith(inFilePath, kDevicePathSpecifier)) {
+          MOZ_ASSERT(!StringBeginsWith(workingPath, kDevicePathSpecifier));
+
+          inFilePath = Substring(inFilePath, kDevicePathSpecifier.Length());
+        } else if (removePathPrefix &&
+                   StringBeginsWith(workingPath, kDevicePathSpecifier)) {
+          MOZ_ASSERT(!StringBeginsWith(inFilePath, kDevicePathSpecifier));
+
+          workingPath = Substring(workingPath, kDevicePathSpecifier.Length());
+        }
+
+        return _wcsicmp(workingPath.get(), inFilePath.get()) == 0;
+      };
+
+  if (equalPath(workingPath, inFilePath, removePathPrefix,
+                removeInPathPrefix)) {
+    *aResult = true;
+    return NS_OK;
+  }
+
+  EnsureShortPath();
+  lf->GetCanonicalPath(inFilePath);
+  workingPath = mShortWorkingPath;
+  *aResult =
+      equalPath(workingPath, inFilePath, removePathPrefix, removeInPathPrefix);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Contains(nsIFile* aInFile, bool* aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  *aResult = false;
+
+  nsAutoString myFilePath;
+  if (NS_FAILED(GetTarget(myFilePath))) {
+    GetPath(myFilePath);
+  }
+
+  uint32_t myFilePathLen = myFilePath.Length();
+
+  nsAutoString inFilePath;
+  if (NS_FAILED(aInFile->GetTarget(inFilePath))) {
+    aInFile->GetPath(inFilePath);
+  }
+
+  // Make sure that the |aInFile|'s path has a trailing separator.
+  if (inFilePath.Length() > myFilePathLen &&
+      inFilePath[myFilePathLen] == L'\\') {
+    if (_wcsnicmp(myFilePath.get(), inFilePath.get(), myFilePathLen) == 0) {
+      *aResult = true;
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetTarget(nsAString& aResult) {
+  aResult.Truncate();
+  Resolve();
+
+  MOZ_ASSERT_IF(
+      mUseDOSDevicePathSyntax,
+      !FilePreferences::StartsWithDiskDesignatorAndBackslash(mResolvedPath));
+
+  aResult = mResolvedPath;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetDirectoryEntriesImpl(nsIDirectoryEnumerator** aEntries) {
+  nsresult rv;
+
+  *aEntries = nullptr;
+  if (mWorkingPath.EqualsLiteral("\\\\.")) {
+    RefPtr<nsDriveEnumerator> drives =
+        new nsDriveEnumerator(mUseDOSDevicePathSyntax);
+    rv = drives->Init();
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+    drives.forget(aEntries);
+    return NS_OK;
+  }
+
+  RefPtr<nsDirEnumerator> dirEnum = new nsDirEnumerator();
+  rv = dirEnum->Init(this);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  dirEnum.forget(aEntries);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetPersistentDescriptor(nsACString& aPersistentDescriptor) {
+  CopyUTF16toUTF8(mWorkingPath, aPersistentDescriptor);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetPersistentDescriptor(const nsACString& aPersistentDescriptor) {
+  if (IsUtf8(aPersistentDescriptor)) {
+    return InitWithPath(NS_ConvertUTF8toUTF16(aPersistentDescriptor));
+  } else {
+    return InitWithNativePath(aPersistentDescriptor);
+  }
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetReadOnly(bool* aReadOnly) {
+  NS_ENSURE_ARG_POINTER(aReadOnly);
+
+  DWORD dwAttrs = GetFileAttributesW(mWorkingPath.get());
+  if (dwAttrs == INVALID_FILE_ATTRIBUTES) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  *aReadOnly = dwAttrs & FILE_ATTRIBUTE_READONLY;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetReadOnly(bool aReadOnly) {
+  DWORD dwAttrs = GetFileAttributesW(mWorkingPath.get());
+  if (dwAttrs == INVALID_FILE_ATTRIBUTES) {
+    return NS_ERROR_FILE_INVALID_PATH;
+  }
+
+  if (aReadOnly) {
+    dwAttrs |= FILE_ATTRIBUTE_READONLY;
+  } else {
+    dwAttrs &= ~FILE_ATTRIBUTE_READONLY;
+  }
+
+  if (SetFileAttributesW(mWorkingPath.get(), dwAttrs) == 0) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetUseDOSDevicePathSyntax(bool* aUseDOSDevicePathSyntax) {
+  MOZ_ASSERT(aUseDOSDevicePathSyntax);
+
+  *aUseDOSDevicePathSyntax = mUseDOSDevicePathSyntax;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetUseDOSDevicePathSyntax(bool aUseDOSDevicePathSyntax) {
+  if (mUseDOSDevicePathSyntax == aUseDOSDevicePathSyntax) {
+    return NS_OK;
+  }
+
+  if (mUseDOSDevicePathSyntax) {
+    if (StringBeginsWith(mWorkingPath, kDevicePathSpecifier)) {
+      MakeDirty();
+      // Remove the prefix
+      mWorkingPath = Substring(mWorkingPath, kDevicePathSpecifier.Length());
+    }
+  } else {
+    if (FilePreferences::StartsWithDiskDesignatorAndBackslash(mWorkingPath)) {
+      MakeDirty();
+      // Prepend the prefix
+      mWorkingPath = kDevicePathSpecifier + mWorkingPath;
+    }
+  }
+
+  mUseDOSDevicePathSyntax = aUseDOSDevicePathSyntax;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Reveal() {
+  // This API should be main thread only
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // make sure mResolvedPath is set
+  nsresult rv = Resolve();
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_NOT_FOUND) {
+    return rv;
+  }
+
+  nsCOMPtr<nsIRunnable> task =
+      NS_NewRunnableFunction("nsLocalFile::Reveal", [path = mResolvedPath]() {
+        MOZ_ASSERT(!NS_IsMainThread(), "Don't run on the main thread");
+
+        bool doCoUninitialize = SUCCEEDED(CoInitializeEx(
+            nullptr, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE));
+        RevealFile(path);
+        if (doCoUninitialize) {
+          CoUninitialize();
+        }
+      });
+
+  return NS_DispatchBackgroundTask(task,
+                                   nsIEventTarget::DISPATCH_EVENT_MAY_BLOCK);
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetWindowsFileAttributes(uint32_t* aAttrs) {
+  NS_ENSURE_ARG_POINTER(aAttrs);
+
+  DWORD dwAttrs = ::GetFileAttributesW(mWorkingPath.get());
+  if (dwAttrs == INVALID_FILE_ATTRIBUTES) {
+    return ConvertWinError(GetLastError());
+  }
+
+  *aAttrs = dwAttrs;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetWindowsFileAttributes(uint32_t aSetAttrs,
+                                      uint32_t aClearAttrs) {
+  DWORD dwAttrs = ::GetFileAttributesW(mWorkingPath.get());
+  if (dwAttrs == INVALID_FILE_ATTRIBUTES) {
+    return ConvertWinError(GetLastError());
+  }
+
+  dwAttrs = (dwAttrs & ~aClearAttrs) | aSetAttrs;
+
+  if (::SetFileAttributesW(mWorkingPath.get(), dwAttrs) == 0) {
+    return ConvertWinError(GetLastError());
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsLocalFile::Launch() {
+  // This API should be main thread only
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // use the app registry name to launch a shell execute....
+  _bstr_t execPath(mWorkingPath.get());
+
+  _variant_t args;
+  // Pass VT_ERROR/DISP_E_PARAMNOTFOUND to omit an optional RPC parameter
+  // to execute a file with the default verb.
+  _variant_t verbDefault(DISP_E_PARAMNOTFOUND, VT_ERROR);
+  _variant_t showCmd(SW_SHOWNORMAL);
+
+  // Use the directory of the file we're launching as the working
+  // directory. That way if we have a self extracting EXE it won't
+  // suggest to extract to the install directory.
+  wchar_t* workingDirectoryPtr = nullptr;
+  WCHAR workingDirectory[MAX_PATH + 1] = {L'\0'};
+  wcsncpy(workingDirectory, mWorkingPath.get(), MAX_PATH);
+  if (PathRemoveFileSpecW(workingDirectory)) {
+    workingDirectoryPtr = workingDirectory;
+  } else {
+    NS_WARNING("Could not set working directory for launched file.");
+  }
+
+  // We have two methods to launch a file: ShellExecuteExW and
+  // ShellExecuteByExplorer.  ShellExecuteExW starts a new process as a child
+  // of the current process, while ShellExecuteByExplorer starts a new process
+  // as a child of explorer.exe.
+  //
+  // We prefer launching a process via ShellExecuteByExplorer because
+  // applications may not support the mitigation policies inherited from our
+  // process.  For example, Skype for Business does not start correctly with
+  // the PreferSystem32Images policy which is one of the policies we use.
+  //
+  // If ShellExecuteByExplorer fails for some reason e.g. a system without
+  // running explorer.exe or VDI environment like Citrix, we fall back to
+  // ShellExecuteExW which still works in those special environments.
+  //
+  // There is an exception where we go straight to ShellExecuteExW without
+  // trying ShellExecuteByExplorer.  When the extension of a downloaded file is
+  // "exe", we prefer security rather than compatibility.
+  //
+  // When a user launches a downloaded executable, the directory containing
+  // the downloaded file may contain a malicious DLL with a common name, which
+  // may have been downloaded before.  If the downloaded executable is launched
+  // without the PreferSystem32Images policy, the process can be tricked into
+  // loading the malicious DLL in the same directory if its name is in the
+  // executable's dependent modules.  Therefore, we always launch ".exe"
+  // executables via ShellExecuteExW so they inherit our process's mitigation
+  // policies including PreferSystem32Images.
+  //
+  // If the extension is not "exe", then we assume that we are launching an
+  // installed application, and therefore the security risk described above
+  // is lessened, as a malicious DLL is less likely to be installed in the
+  // application's directory.  In that case, we attempt to preserve
+  // compatibility and try ShellExecuteByExplorer first.
+
+  static const char* const onlyExeExt[] = {".exe"};
+  bool isExecutable;
+  nsresult rv =
+      LookupExtensionIn(onlyExeExt, ArrayLength(onlyExeExt), &isExecutable);
+  if (NS_FAILED(rv)) {
+    isExecutable = false;
+  }
+
+  // If the file is an executable, go straight to ShellExecuteExW.
+  // Otherwise try ShellExecuteByExplorer first, and if it fails,
+  // run ShellExecuteExW.
+  if (!isExecutable) {
+    mozilla::LauncherVoidResult shellExecuteOk =
+        mozilla::ShellExecuteByExplorer(execPath, args, verbDefault,
+                                        workingDirectoryPtr, showCmd);
+    if (shellExecuteOk.isOk()) {
+      return NS_OK;
+    }
+  }
+
+  SHELLEXECUTEINFOW seinfo = {sizeof(SHELLEXECUTEINFOW)};
+  seinfo.fMask = SEE_MASK_ASYNCOK;
+  seinfo.hwnd = GetMostRecentNavigatorHWND();
+  seinfo.lpVerb = nullptr;
+  seinfo.lpFile = mWorkingPath.get();
+  seinfo.lpParameters = nullptr;
+  seinfo.lpDirectory = workingDirectoryPtr;
+  seinfo.nShow = SW_SHOWNORMAL;
+
+  if (!ShellExecuteExW(&seinfo)) {
+    return NS_ERROR_FILE_EXECUTION_FAILED;
+  }
+
+  return NS_OK;
+}
+
+nsresult NS_NewLocalFile(const nsAString& aPath, bool aFollowLinks,
+                         nsIFile** aResult) {
+  RefPtr<nsLocalFile> file = new nsLocalFile();
+
+  if (!aPath.IsEmpty()) {
+    nsresult rv = file->InitWithPath(aPath);
+    if (NS_FAILED(rv)) {
+      return rv;
+    }
+  }
+
+  file.forget(aResult);
+  return NS_OK;
+}
+
+//-----------------------------------------------------------------------------
+// Native (lossy) interface
+//-----------------------------------------------------------------------------
+
+NS_IMETHODIMP
+nsLocalFile::InitWithNativePath(const nsACString& aFilePath) {
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aFilePath, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return InitWithPath(tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::AppendNative(const nsACString& aNode) {
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNode, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return Append(tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::AppendRelativeNativePath(const nsACString& aNode) {
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNode, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return AppendRelativePath(tmp);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetNativeLeafName(nsACString& aLeafName) {
+  // NS_WARNING("This API is lossy. Use GetLeafName !");
+  nsAutoString tmp;
+  nsresult rv = GetLeafName(tmp);
+  if (NS_SUCCEEDED(rv)) {
+    rv = NS_CopyUnicodeToNative(tmp, aLeafName);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::SetNativeLeafName(const nsACString& aLeafName) {
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aLeafName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return SetLeafName(tmp);
+  }
+
+  return rv;
+}
+
+nsString nsLocalFile::NativePath() { return mWorkingPath; }
+
+nsCString nsIFile::HumanReadablePath() {
+  nsString path;
+  DebugOnly<nsresult> rv = GetPath(path);
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+  return NS_ConvertUTF16toUTF8(path);
+}
+
+NS_IMETHODIMP
+nsLocalFile::CopyToNative(nsIFile* aNewParentDir, const nsACString& aNewName) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (aNewName.IsEmpty()) {
+    return CopyTo(aNewParentDir, u""_ns);
+  }
+
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNewName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return CopyTo(aNewParentDir, tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::CopyToFollowingLinksNative(nsIFile* aNewParentDir,
+                                        const nsACString& aNewName) {
+  if (aNewName.IsEmpty()) {
+    return CopyToFollowingLinks(aNewParentDir, u""_ns);
+  }
+
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNewName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return CopyToFollowingLinks(aNewParentDir, tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::MoveToNative(nsIFile* aNewParentDir, const nsACString& aNewName) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (aNewName.IsEmpty()) {
+    return MoveTo(aNewParentDir, u""_ns);
+  }
+
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNewName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return MoveTo(aNewParentDir, tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::MoveToFollowingLinksNative(nsIFile* aNewParentDir,
+                                        const nsACString& aNewName) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  if (aNewName.IsEmpty()) {
+    return MoveToFollowingLinks(aNewParentDir, u""_ns);
+  }
+
+  nsAutoString tmp;
+  nsresult rv = NS_CopyNativeToUnicode(aNewName, tmp);
+  if (NS_SUCCEEDED(rv)) {
+    return MoveToFollowingLinks(aNewParentDir, tmp);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalFile::GetNativeTarget(nsACString& aResult) {
+  // Check we are correctly initialized.
+  CHECK_mWorkingPath();
+
+  NS_WARNING("This API is lossy. Use GetTarget !");
+  nsAutoString tmp;
+  nsresult rv = GetTarget(tmp);
+  if (NS_SUCCEEDED(rv)) {
+    rv = NS_CopyUnicodeToNative(tmp, aResult);
+  }
+
+  return rv;
+}
+
+nsresult NS_NewNativeLocalFile(const nsACString& aPath, bool aFollowLinks,
+                               nsIFile** aResult) {
+  nsAutoString buf;
+  nsresult rv = NS_CopyNativeToUnicode(aPath, buf);
+  if (NS_FAILED(rv)) {
+    *aResult = nullptr;
+    return rv;
+  }
+  return NS_NewLocalFile(buf, aFollowLinks, aResult);
+}
+
+void nsLocalFile::EnsureShortPath() {
+  if (!mShortWorkingPath.IsEmpty()) {
+    return;
+  }
+
+  WCHAR shortPath[MAX_PATH + 1];
+  DWORD lengthNeeded = ::GetShortPathNameW(mWorkingPath.get(), shortPath,
+                                           ArrayLength(shortPath));
+  // If an error occurred then lengthNeeded is set to 0 or the length of the
+  // needed buffer including null termination.  If it succeeds the number of
+  // wide characters not including null termination is returned.
+  if (lengthNeeded != 0 && lengthNeeded < ArrayLength(shortPath)) {
+    mShortWorkingPath.Assign(shortPath);
+  } else {
+    mShortWorkingPath.Assign(mWorkingPath);
+  }
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(nsDriveEnumerator, nsSimpleEnumerator,
+                            nsIDirectoryEnumerator)
+
+nsDriveEnumerator::nsDriveEnumerator(bool aUseDOSDevicePathSyntax)
+    : mUseDOSDevicePathSyntax(aUseDOSDevicePathSyntax) {}
+
+nsDriveEnumerator::~nsDriveEnumerator() {}
+
+nsresult nsDriveEnumerator::Init() {
+  /* If the length passed to GetLogicalDriveStrings is smaller
+   * than the length of the string it would return, it returns
+   * the length required for the string. */
+  DWORD length = GetLogicalDriveStringsW(0, 0);
+  /* The string is null terminated */
+  if (!mDrives.SetLength(length + 1, fallible)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  if (!GetLogicalDriveStringsW(length, mDrives.get())) {
+    return NS_ERROR_FAILURE;
+  }
+  mDrives.BeginReading(mStartOfCurrentDrive);
+  mDrives.EndReading(mEndOfDrivesString);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDriveEnumerator::HasMoreElements(bool* aHasMore) {
+  *aHasMore = *mStartOfCurrentDrive != L'\0';
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsDriveEnumerator::GetNext(nsISupports** aNext) {
+  /* GetLogicalDrives stored in mDrives is a concatenation
+   * of null terminated strings, followed by a null terminator.
+   * mStartOfCurrentDrive is an iterator pointing at the first
+   * character of the current drive. */
+  if (*mStartOfCurrentDrive == L'\0') {
+    *aNext = nullptr;
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAString::const_iterator driveEnd = mStartOfCurrentDrive;
+  FindCharInReadable(L'\0', driveEnd, mEndOfDrivesString);
+  nsString drive(Substring(mStartOfCurrentDrive, driveEnd));
+  mStartOfCurrentDrive = ++driveEnd;
+
+  nsIFile* file;
+  nsresult rv = NewLocalFile(drive, mUseDOSDevicePathSyntax, &file);
+
+  *aNext = file;
+  return rv;
+}