forked from mirrors/gecko-dev
423ce68542
Any more specific work that is happening in these methods will have its own specific category labeling in that specific code. The instances touched in this patch are more on the outside and don't really know what kind of code is going to be running inside. MozReview-Commit-ID: 47NO1DZzkdH --HG-- extra : rebase_source : 344c380ddaaf42a1fd820a26b762c61ee9e2d524
75 lines
2 KiB
C++
75 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "FileUtilsWin.h"
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#include <windows.h>
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#include <psapi.h>
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#include "mozilla/Unused.h"
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#include "nsWindowsHelpers.h"
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#include "GeckoProfiler.h"
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namespace {
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// Scoped type used by HandleToFilename
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struct ScopedMappedViewTraits
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{
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typedef void* type;
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static void* empty()
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{
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return nullptr;
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}
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static void release(void* aPtr)
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{
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if (aPtr) {
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mozilla::Unused << UnmapViewOfFile(aPtr);
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}
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}
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};
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typedef mozilla::Scoped<ScopedMappedViewTraits> ScopedMappedView;
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} // namespace
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namespace mozilla {
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bool
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HandleToFilename(HANDLE aHandle, const LARGE_INTEGER& aOffset,
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nsAString& aFilename)
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{
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AUTO_PROFILER_LABEL("HandletoFilename", OTHER);
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aFilename.Truncate();
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// This implementation is nice because it uses fully documented APIs that
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// are available on all Windows versions that we support.
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nsAutoHandle fileMapping(CreateFileMapping(aHandle, nullptr, PAGE_READONLY,
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0, 1, nullptr));
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if (!fileMapping) {
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return false;
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}
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ScopedMappedView view(MapViewOfFile(fileMapping, FILE_MAP_READ,
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aOffset.HighPart, aOffset.LowPart, 1));
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if (!view) {
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return false;
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}
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nsAutoString mappedFilename;
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DWORD len = 0;
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SetLastError(ERROR_SUCCESS);
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do {
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mappedFilename.SetLength(mappedFilename.Length() + MAX_PATH);
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len = GetMappedFileNameW(GetCurrentProcess(), view,
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mappedFilename.get(),
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mappedFilename.Length());
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} while (!len && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
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if (!len) {
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return false;
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}
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mappedFilename.Truncate(len);
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return NtPathToDosPath(mappedFilename, aFilename);
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}
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} // namespace mozilla
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