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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "device/core/device_info_query_win.h"
#include <stddef.h>
#include <string.h>
#include "base/strings/string_util.h"
namespace device {
DeviceInfoQueryWin::DeviceInfoQueryWin()
: device_info_list_(SetupDiCreateDeviceInfoList(nullptr, nullptr)) {
memset(&device_info_data_, 0, sizeof(device_info_data_));
}
DeviceInfoQueryWin::~DeviceInfoQueryWin() {
if (device_info_list_valid()) {
// Release |device_info_data_| only when it is valid.
if (device_info_data_.cbSize != 0)
SetupDiDeleteDeviceInfo(device_info_list_, &device_info_data_);
SetupDiDestroyDeviceInfoList(device_info_list_);
}
}
bool DeviceInfoQueryWin::AddDevice(const char* device_path) {
return SetupDiOpenDeviceInterfaceA(device_info_list_, device_path, 0,
nullptr) != FALSE;
}
bool DeviceInfoQueryWin::GetDeviceInfo() {
DCHECK_EQ(0U, device_info_data_.cbSize);
device_info_data_.cbSize = sizeof(device_info_data_);
if (!SetupDiEnumDeviceInfo(device_info_list_, 0, &device_info_data_)) {
// Clear cbSize to maintain the invariant.
device_info_data_.cbSize = 0;
return false;
}
return true;
}
bool DeviceInfoQueryWin::GetDeviceStringProperty(DWORD property,
std::string* property_buffer) {
DWORD property_reg_data_type;
const size_t property_buffer_length = 512;
if (!SetupDiGetDeviceRegistryPropertyA(
device_info_list_, &device_info_data_, property,
&property_reg_data_type,
reinterpret_cast<PBYTE>(
base::WriteInto(property_buffer, property_buffer_length)),
static_cast<DWORD>(property_buffer_length), nullptr))
return false;
if (property_reg_data_type != REG_SZ)
return false;
// Shrink |property_buffer| down to its correct size.
size_t eos = property_buffer->find('\0');
if (eos != std::string::npos)
property_buffer->resize(eos);
return true;
}
} // namespace device
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