1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/xpcom/io/FileUtilsWin.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,63 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "FileUtilsWin.h"
1.11 +
1.12 +#include <windows.h>
1.13 +#include <psapi.h>
1.14 +
1.15 +#include "nsWindowsHelpers.h"
1.16 +
1.17 +namespace {
1.18 +
1.19 +// Scoped type used by HandleToFilename
1.20 +struct ScopedMappedViewTraits
1.21 +{
1.22 + typedef void* type;
1.23 + static void* empty() { return nullptr; }
1.24 + static void release(void* ptr) { UnmapViewOfFile(ptr); }
1.25 +};
1.26 +typedef mozilla::Scoped<ScopedMappedViewTraits> ScopedMappedView;
1.27 +
1.28 +} // anonymous namespace
1.29 +
1.30 +namespace mozilla {
1.31 +
1.32 +bool
1.33 +HandleToFilename(HANDLE aHandle, const LARGE_INTEGER& aOffset,
1.34 + nsAString& aFilename)
1.35 +{
1.36 + aFilename.Truncate();
1.37 + // This implementation is nice because it uses fully documented APIs that
1.38 + // are available on all Windows versions that we support.
1.39 + nsAutoHandle fileMapping(CreateFileMapping(aHandle, nullptr, PAGE_READONLY,
1.40 + 0, 1, nullptr));
1.41 + if (!fileMapping) {
1.42 + return false;
1.43 + }
1.44 + ScopedMappedView view(MapViewOfFile(fileMapping, FILE_MAP_READ,
1.45 + aOffset.HighPart, aOffset.LowPart, 1));
1.46 + if (!view) {
1.47 + return false;
1.48 + }
1.49 + nsAutoString mappedFilename;
1.50 + DWORD len = 0;
1.51 + SetLastError(ERROR_SUCCESS);
1.52 + do {
1.53 + mappedFilename.SetLength(mappedFilename.Length() + MAX_PATH);
1.54 + len = GetMappedFileNameW(GetCurrentProcess(), view,
1.55 + wwc(mappedFilename.BeginWriting()),
1.56 + mappedFilename.Length());
1.57 + } while (!len && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
1.58 + if (!len) {
1.59 + return false;
1.60 + }
1.61 + mappedFilename.Truncate(len);
1.62 + return NtPathToDosPath(mappedFilename, aFilename);
1.63 +}
1.64 +
1.65 +} // namespace mozilla
1.66 +
