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-rw-r--r--xpcom/io/FileUtilsWin.cpp127
1 files changed, 127 insertions, 0 deletions
diff --git a/xpcom/io/FileUtilsWin.cpp b/xpcom/io/FileUtilsWin.cpp
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+++ b/xpcom/io/FileUtilsWin.cpp
@@ -0,0 +1,127 @@
+/* -*- 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 "FileUtilsWin.h"
+
+#include <windows.h>
+#include <psapi.h>
+
+#include "base/process_util.h"
+#include "mozilla/ProfilerLabels.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Unused.h"
+#include "nsWindowsHelpers.h"
+
+namespace mozilla {
+
+bool HandleToFilename(HANDLE aHandle, const LARGE_INTEGER& aOffset,
+ nsAString& aFilename) {
+ AUTO_PROFILER_LABEL("HandletoFilename", OTHER);
+
+ aFilename.Truncate();
+ // This implementation is nice because it uses fully documented APIs that
+ // are available on all Windows versions that we support.
+ nsAutoHandle fileMapping(
+ CreateFileMapping(aHandle, nullptr, PAGE_READONLY, 0, 1, nullptr));
+ if (!fileMapping) {
+ return false;
+ }
+ const auto view = MapViewOfFile(fileMapping, FILE_MAP_READ, aOffset.HighPart,
+ aOffset.LowPart, 1);
+ if (!view) {
+ return false;
+ }
+ const auto cleanup =
+ MakeScopeExit([&]() { mozilla::Unused << UnmapViewOfFile(view); });
+
+ nsAutoString mappedFilename;
+ DWORD len = 0;
+ SetLastError(ERROR_SUCCESS);
+ do {
+ mappedFilename.SetLength(mappedFilename.Length() + MAX_PATH);
+ len = GetMappedFileNameW(GetCurrentProcess(), view, mappedFilename.get(),
+ mappedFilename.Length());
+ } while (!len && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
+ if (!len) {
+ return false;
+ }
+ mappedFilename.Truncate(len);
+ return NtPathToDosPath(mappedFilename, aFilename);
+}
+
+template <class T>
+struct RVAMap {
+ RVAMap(HANDLE map, DWORD offset) {
+ SYSTEM_INFO info;
+ GetSystemInfo(&info);
+
+ DWORD alignedOffset =
+ (offset / info.dwAllocationGranularity) * info.dwAllocationGranularity;
+
+ MOZ_ASSERT(offset - alignedOffset < info.dwAllocationGranularity, "Wtf");
+
+ mRealView = ::MapViewOfFile(map, FILE_MAP_READ, 0, alignedOffset,
+ sizeof(T) + (offset - alignedOffset));
+
+ mMappedView =
+ mRealView
+ ? reinterpret_cast<T*>((char*)mRealView + (offset - alignedOffset))
+ : nullptr;
+ }
+ ~RVAMap() {
+ if (mRealView) {
+ ::UnmapViewOfFile(mRealView);
+ }
+ }
+ operator const T*() const { return mMappedView; }
+ const T* operator->() const { return mMappedView; }
+
+ private:
+ const T* mMappedView;
+ void* mRealView;
+};
+
+uint32_t GetExecutableArchitecture(const wchar_t* aPath) {
+ nsAutoHandle file(::CreateFileW(aPath, GENERIC_READ, FILE_SHARE_READ, nullptr,
+ OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
+ nullptr));
+ if (!file) {
+ return base::PROCESS_ARCH_INVALID;
+ }
+
+ nsAutoHandle map(
+ ::CreateFileMappingW(file, nullptr, PAGE_READONLY, 0, 0, nullptr));
+ if (!map) {
+ return base::PROCESS_ARCH_INVALID;
+ }
+
+ RVAMap<IMAGE_DOS_HEADER> peHeader(map, 0);
+ if (!peHeader) {
+ return base::PROCESS_ARCH_INVALID;
+ }
+
+ RVAMap<IMAGE_NT_HEADERS> ntHeader(map, peHeader->e_lfanew);
+ if (!ntHeader) {
+ return base::PROCESS_ARCH_INVALID;
+ }
+
+ switch (ntHeader->FileHeader.Machine) {
+ case IMAGE_FILE_MACHINE_I386:
+ return base::PROCESS_ARCH_I386;
+ case IMAGE_FILE_MACHINE_AMD64:
+ return base::PROCESS_ARCH_X86_64;
+ case IMAGE_FILE_MACHINE_ARM64:
+ return base::PROCESS_ARCH_ARM_64;
+ case IMAGE_FILE_MACHINE_ARM:
+ case IMAGE_FILE_MACHINE_ARMNT:
+ case IMAGE_FILE_MACHINE_THUMB:
+ return base::PROCESS_ARCH_ARM;
+ default:
+ return base::PROCESS_ARCH_INVALID;
+ }
+}
+
+} // namespace mozilla