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64 lines
1.9 KiB
C++
64 lines
1.9 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 "nsWindowsHelpers.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() { return nullptr; }
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static void release(void* ptr) { UnmapViewOfFile(ptr); }
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};
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typedef mozilla::Scoped<ScopedMappedViewTraits> ScopedMappedView;
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} // anonymous 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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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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wwc(mappedFilename.BeginWriting()),
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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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