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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// windows.h needs to be included before delayimp.h.
#include <windows.h>
#include <delayimp.h>
#include <algorithm>
#include <string_view>
#include "base/check.h"
#include "base/compiler_specific.h"
#include "base/containers/fixed_flat_set.h"
#include "base/containers/span.h"
#include "base/debug/alias.h"
#include "base/numerics/safe_conversions.h"
#include "base/strings/string_util.h"
#include "chrome/common/win/delay_load_failure_support.h"
namespace chrome {
namespace {
// Delay load failure hook that generates a crash report. By default a failure
// to delay load will trigger an exception handled by the delay load runtime and
// this won't generate a crash report.
FARPROC WINAPI DelayLoadFailureHook(unsigned reason, DelayLoadInfo* dll_info) {
std::string_view raw_dll_name(dll_info->szDll);
if (raw_dll_name.size() < MAX_PATH) {
// It's not an error if these optional modules fail to be loaded, there are
// custom exception handlers in `device/bluetooth/bluetooth_init_win.cc` and
// `media/base/win/mf_initializer.cc` that will intercept the exception
// triggered by the delay load runtime. Returning 0 will tell the runtime
// that this failure hasn't been handled and it'll cause the exception to be
// raised.
static constexpr auto kOptionalModules =
base::MakeFixedFlatSet<std::string_view>(
{"bthprops.cpl", "mf.dll", "mfplat.dll", "mfreadwrite.dll"});
// Copy and transform the module name into lower case.
char dll_name_buffer[MAX_PATH];
base::span<char> dll_name_buffer_span(dll_name_buffer);
auto out_end =
std::ranges::transform(raw_dll_name, dll_name_buffer_span.begin(),
[](char c) { return base::ToLowerASCII(c); })
.out;
auto len =
base::checked_cast<size_t>(out_end - dll_name_buffer_span.begin());
if (kOptionalModules.contains({&dll_name_buffer_span.front(), len})) {
return 0;
}
}
return HandleDelayLoadFailureCommon(reason, dll_info);
}
} // namespace
} // namespace chrome
// Set the delay load failure hook to the function above.
//
// The |__pfnDliFailureHook2| failure notification hook gets called
// automatically by the delay load runtime in case of failure, see
// https://docs.microsoft.com/en-us/cpp/build/reference/failure-hooks?view=vs-2019
// for more information about this.
extern "C" const PfnDliHook __pfnDliFailureHook2 = chrome::DelayLoadFailureHook;
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