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comparison: xpcom/io/FileUtilsWin.cpp
xpcom/io/FileUtilsWin.cpp
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:58ba6d487388 |
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "FileUtilsWin.h" | |
| 8 | |
| 9 #include <windows.h> | |
| 10 #include <psapi.h> | |
| 11 | |
| 12 #include "nsWindowsHelpers.h" | |
| 13 | |
| 14 namespace { | |
| 15 | |
| 16 // Scoped type used by HandleToFilename | |
| 17 struct ScopedMappedViewTraits | |
| 18 { | |
| 19 typedef void* type; | |
| 20 static void* empty() { return nullptr; } | |
| 21 static void release(void* ptr) { UnmapViewOfFile(ptr); } | |
| 22 }; | |
| 23 typedef mozilla::Scoped<ScopedMappedViewTraits> ScopedMappedView; | |
| 24 | |
| 25 } // anonymous namespace | |
| 26 | |
| 27 namespace mozilla { | |
| 28 | |
| 29 bool | |
| 30 HandleToFilename(HANDLE aHandle, const LARGE_INTEGER& aOffset, | |
| 31 nsAString& aFilename) | |
| 32 { | |
| 33 aFilename.Truncate(); | |
| 34 // This implementation is nice because it uses fully documented APIs that | |
| 35 // are available on all Windows versions that we support. | |
| 36 nsAutoHandle fileMapping(CreateFileMapping(aHandle, nullptr, PAGE_READONLY, | |
| 37 0, 1, nullptr)); | |
| 38 if (!fileMapping) { | |
| 39 return false; | |
| 40 } | |
| 41 ScopedMappedView view(MapViewOfFile(fileMapping, FILE_MAP_READ, | |
| 42 aOffset.HighPart, aOffset.LowPart, 1)); | |
| 43 if (!view) { | |
| 44 return false; | |
| 45 } | |
| 46 nsAutoString mappedFilename; | |
| 47 DWORD len = 0; | |
| 48 SetLastError(ERROR_SUCCESS); | |
| 49 do { | |
| 50 mappedFilename.SetLength(mappedFilename.Length() + MAX_PATH); | |
| 51 len = GetMappedFileNameW(GetCurrentProcess(), view, | |
| 52 wwc(mappedFilename.BeginWriting()), | |
| 53 mappedFilename.Length()); | |
| 54 } while (!len && GetLastError() == ERROR_INSUFFICIENT_BUFFER); | |
| 55 if (!len) { | |
| 56 return false; | |
| 57 } | |
| 58 mappedFilename.Truncate(len); | |
| 59 return NtPathToDosPath(mappedFilename, aFilename); | |
| 60 } | |
| 61 | |
| 62 } // namespace mozilla | |
| 63 |
