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hid.c
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/*******************************************************
HIDAPI - Multi-Platform library for
communication with HID devices.
Alan Ott
Signal 11 Software
libusb/hidapi Team
Copyright 2022, All Rights Reserved.
At the discretion of the user of this library,
this software may be licensed under the terms of the
GNU General Public License v3, a BSD-Style license, or the
original HIDAPI license as outlined in the LICENSE.txt,
LICENSE-gpl3.txt, LICENSE-bsd.txt, and LICENSE-orig.txt
files located at the root of the source distribution.
These files may also be found in the public source
code repository located at:
https://github.com/libusb/hidapi .
********************************************************/
#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
/* Do not warn about wcsncpy usage.
https://docs.microsoft.com/cpp/c-runtime-library/security-features-in-the-crt */
#define _CRT_SECURE_NO_WARNINGS
#endif
#ifdef __cplusplus
extern "C" {
#endif
#include "hidapi_winapi.h"
#include <windows.h>
#ifndef _NTDEF_
typedef LONG NTSTATUS;
#endif
#ifdef __MINGW32__
#include <ntdef.h>
#include <winbase.h>
#define WC_ERR_INVALID_CHARS 0x00000080
#endif
#ifdef __CYGWIN__
#include <ntdef.h>
#include <wctype.h>
#define _wcsdup wcsdup
#endif
/*#define HIDAPI_USE_DDK*/
#include "hidapi_cfgmgr32.h"
#include "hidapi_hidclass.h"
#include "hidapi_hidsdi.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef MIN
#undef MIN
#endif
#define MIN(x,y) ((x) < (y)? (x): (y))
/* MAXIMUM_USB_STRING_LENGTH from usbspec.h is 255 */
/* BLUETOOTH_DEVICE_NAME_SIZE from bluetoothapis.h is 256 */
#define MAX_STRING_WCHARS 256
/* For certain USB devices, using a buffer larger or equal to 127 wchars results
in successful completion of HID API functions, but a broken string is stored
in the output buffer. This behaviour persists even if HID API is bypassed and
HID IOCTLs are passed to the HID driver directly. Therefore, for USB devices,
the buffer MUST NOT exceed 126 WCHARs.
*/
#define MAX_STRING_WCHARS_USB 126
static struct hid_api_version api_version = {
.major = HID_API_VERSION_MAJOR,
.minor = HID_API_VERSION_MINOR,
.patch = HID_API_VERSION_PATCH
};
#ifndef HIDAPI_USE_DDK
/* Since we're not building with the DDK, and the HID header
files aren't part of the Windows SDK, we define what we need ourselves.
In lookup_functions(), the function pointers
defined below are set. */
static HidD_GetHidGuid_ HidD_GetHidGuid;
static HidD_GetAttributes_ HidD_GetAttributes;
static HidD_GetSerialNumberString_ HidD_GetSerialNumberString;
static HidD_GetManufacturerString_ HidD_GetManufacturerString;
static HidD_GetProductString_ HidD_GetProductString;
static HidD_SetFeature_ HidD_SetFeature;
static HidD_GetFeature_ HidD_GetFeature;
static HidD_SetOutputReport_ HidD_SetOutputReport;
static HidD_GetInputReport_ HidD_GetInputReport;
static HidD_GetIndexedString_ HidD_GetIndexedString;
static HidD_GetPreparsedData_ HidD_GetPreparsedData;
static HidD_FreePreparsedData_ HidD_FreePreparsedData;
static HidP_GetCaps_ HidP_GetCaps;
static HidD_SetNumInputBuffers_ HidD_SetNumInputBuffers;
static CM_Locate_DevNodeW_ CM_Locate_DevNodeW = NULL;
static CM_Get_Parent_ CM_Get_Parent = NULL;
static CM_Get_DevNode_PropertyW_ CM_Get_DevNode_PropertyW = NULL;
static CM_Get_Device_Interface_PropertyW_ CM_Get_Device_Interface_PropertyW = NULL;
static CM_Get_Device_Interface_List_SizeW_ CM_Get_Device_Interface_List_SizeW = NULL;
static CM_Get_Device_Interface_ListW_ CM_Get_Device_Interface_ListW = NULL;
static HMODULE hid_lib_handle = NULL;
static HMODULE cfgmgr32_lib_handle = NULL;
static BOOLEAN hidapi_initialized = FALSE;
static void free_library_handles()
{
if (hid_lib_handle)
FreeLibrary(hid_lib_handle);
hid_lib_handle = NULL;
if (cfgmgr32_lib_handle)
FreeLibrary(cfgmgr32_lib_handle);
cfgmgr32_lib_handle = NULL;
}
static int lookup_functions()
{
hid_lib_handle = LoadLibraryW(L"hid.dll");
if (hid_lib_handle == NULL) {
goto err;
}
cfgmgr32_lib_handle = LoadLibraryW(L"cfgmgr32.dll");
if (cfgmgr32_lib_handle == NULL) {
goto err;
}
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wcast-function-type"
#endif
#define RESOLVE(lib_handle, x) x = (x##_)GetProcAddress(lib_handle, #x); if (!x) goto err;
RESOLVE(hid_lib_handle, HidD_GetHidGuid);
RESOLVE(hid_lib_handle, HidD_GetAttributes);
RESOLVE(hid_lib_handle, HidD_GetSerialNumberString);
RESOLVE(hid_lib_handle, HidD_GetManufacturerString);
RESOLVE(hid_lib_handle, HidD_GetProductString);
RESOLVE(hid_lib_handle, HidD_SetFeature);
RESOLVE(hid_lib_handle, HidD_GetFeature);
RESOLVE(hid_lib_handle, HidD_SetOutputReport);
RESOLVE(hid_lib_handle, HidD_GetInputReport);
RESOLVE(hid_lib_handle, HidD_GetIndexedString);
RESOLVE(hid_lib_handle, HidD_GetPreparsedData);
RESOLVE(hid_lib_handle, HidD_FreePreparsedData);
RESOLVE(hid_lib_handle, HidP_GetCaps);
RESOLVE(hid_lib_handle, HidD_SetNumInputBuffers);
RESOLVE(cfgmgr32_lib_handle, CM_Locate_DevNodeW);
RESOLVE(cfgmgr32_lib_handle, CM_Get_Parent);
RESOLVE(cfgmgr32_lib_handle, CM_Get_DevNode_PropertyW);
RESOLVE(cfgmgr32_lib_handle, CM_Get_Device_Interface_PropertyW);
RESOLVE(cfgmgr32_lib_handle, CM_Get_Device_Interface_List_SizeW);
RESOLVE(cfgmgr32_lib_handle, CM_Get_Device_Interface_ListW);
#undef RESOLVE
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
return 0;
err:
free_library_handles();
return -1;
}
#endif /* HIDAPI_USE_DDK */
struct hid_device_ {
HANDLE device_handle;
BOOL blocking;
USHORT output_report_length;
unsigned char *write_buf;
size_t input_report_length;
USHORT feature_report_length;
unsigned char *feature_buf;
wchar_t *last_error_str;
BOOL read_pending;
char *read_buf;
OVERLAPPED ol;
OVERLAPPED write_ol;
struct hid_device_info* device_info;
DWORD write_timeout_ms;
};
static hid_device *new_hid_device()
{
hid_device *dev = (hid_device*) calloc(1, sizeof(hid_device));
if (dev == NULL) {
return NULL;
}
dev->device_handle = INVALID_HANDLE_VALUE;
dev->blocking = TRUE;
dev->output_report_length = 0;
dev->write_buf = NULL;
dev->input_report_length = 0;
dev->feature_report_length = 0;
dev->feature_buf = NULL;
dev->last_error_str = NULL;
dev->read_pending = FALSE;
dev->read_buf = NULL;
memset(&dev->ol, 0, sizeof(dev->ol));
dev->ol.hEvent = CreateEvent(NULL, FALSE, FALSE /*initial state f=nonsignaled*/, NULL);
memset(&dev->write_ol, 0, sizeof(dev->write_ol));
dev->write_ol.hEvent = CreateEvent(NULL, FALSE, FALSE /*initial state f=nonsignaled*/, NULL);
dev->device_info = NULL;
dev->write_timeout_ms = 1000;
return dev;
}
static void free_hid_device(hid_device *dev)
{
CloseHandle(dev->ol.hEvent);
CloseHandle(dev->write_ol.hEvent);
CloseHandle(dev->device_handle);
free(dev->last_error_str);
dev->last_error_str = NULL;
free(dev->write_buf);
free(dev->feature_buf);
free(dev->read_buf);
hid_free_enumeration(dev->device_info);
free(dev);
}
static void register_winapi_error_to_buffer(wchar_t **error_buffer, const WCHAR *op)
{
free(*error_buffer);
*error_buffer = NULL;
/* Only clear out error messages if NULL is passed into op */
if (!op) {
return;
}
WCHAR system_err_buf[1024];
DWORD error_code = GetLastError();
DWORD system_err_len = FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
error_code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
system_err_buf, ARRAYSIZE(system_err_buf),
NULL);
DWORD op_len = (DWORD)wcslen(op);
DWORD op_prefix_len =
op_len
+ 15 /*: (0x00000000) */
;
DWORD msg_len =
+ op_prefix_len
+ system_err_len
;
*error_buffer = (WCHAR *)calloc(msg_len + 1, sizeof (WCHAR));
WCHAR *msg = *error_buffer;
if (!msg)
return;
int printf_written = swprintf(msg, msg_len + 1, L"%.*ls: (0x%08X) %.*ls", (int)op_len, op, error_code, (int)system_err_len, system_err_buf);
if (printf_written < 0)
{
/* Highly unlikely */
msg[0] = L'\0';
return;
}
/* Get rid of the CR and LF that FormatMessage() sticks at the
end of the message. Thanks Microsoft! */
while(msg[msg_len-1] == L'\r' || msg[msg_len-1] == L'\n' || msg[msg_len-1] == L' ')
{
msg[msg_len-1] = L'\0';
msg_len--;
}
}
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Warray-bounds"
#endif
/* A bug in GCC/mingw gives:
* error: array subscript 0 is outside array bounds of 'wchar_t *[0]' {aka 'short unsigned int *[]'} [-Werror=array-bounds]
* | free(*error_buffer);
* Which doesn't make sense in this context. */
static void register_string_error_to_buffer(wchar_t **error_buffer, const WCHAR *string_error)
{
free(*error_buffer);
*error_buffer = NULL;
if (string_error) {
*error_buffer = _wcsdup(string_error);
}
}
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
static void register_winapi_error(hid_device *dev, const WCHAR *op)
{
register_winapi_error_to_buffer(&dev->last_error_str, op);
}
static void register_string_error(hid_device *dev, const WCHAR *string_error)
{
register_string_error_to_buffer(&dev->last_error_str, string_error);
}
static wchar_t *last_global_error_str = NULL;
static void register_global_winapi_error(const WCHAR *op)
{
register_winapi_error_to_buffer(&last_global_error_str, op);
}
static void register_global_error(const WCHAR *string_error)
{
register_string_error_to_buffer(&last_global_error_str, string_error);
}
static HANDLE open_device(const wchar_t *path, BOOL open_rw)
{
HANDLE handle;
DWORD desired_access = (open_rw)? (GENERIC_WRITE | GENERIC_READ): 0;
DWORD share_mode = FILE_SHARE_READ|FILE_SHARE_WRITE;
handle = CreateFileW(path,
desired_access,
share_mode,
NULL,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,/*FILE_ATTRIBUTE_NORMAL,*/
0);
return handle;
}
HID_API_EXPORT const struct hid_api_version* HID_API_CALL hid_version(void)
{
return &api_version;
}
HID_API_EXPORT const char* HID_API_CALL hid_version_str(void)
{
return HID_API_VERSION_STR;
}
int HID_API_EXPORT hid_init(void)
{
register_global_error(NULL);
#ifndef HIDAPI_USE_DDK
if (!hidapi_initialized) {
if (lookup_functions() < 0) {
register_global_winapi_error(L"resolve DLL functions");
return -1;
}
hidapi_initialized = TRUE;
}
#endif
return 0;
}
int HID_API_EXPORT hid_exit(void)
{
#ifndef HIDAPI_USE_DDK
free_library_handles();
hidapi_initialized = FALSE;
#endif
register_global_error(NULL);
return 0;
}
static void* hid_internal_get_devnode_property(DEVINST dev_node, const DEVPROPKEY* property_key, DEVPROPTYPE expected_property_type)
{
ULONG len = 0;
CONFIGRET cr;
DEVPROPTYPE property_type;
PBYTE property_value = NULL;
cr = CM_Get_DevNode_PropertyW(dev_node, property_key, &property_type, NULL, &len, 0);
if (cr != CR_BUFFER_SMALL || property_type != expected_property_type)
return NULL;
property_value = (PBYTE)calloc(len, sizeof(BYTE));
cr = CM_Get_DevNode_PropertyW(dev_node, property_key, &property_type, property_value, &len, 0);
if (cr != CR_SUCCESS) {
free(property_value);
return NULL;
}
return property_value;
}
static void* hid_internal_get_device_interface_property(const wchar_t* interface_path, const DEVPROPKEY* property_key, DEVPROPTYPE expected_property_type)
{
ULONG len = 0;
CONFIGRET cr;
DEVPROPTYPE property_type;
PBYTE property_value = NULL;
cr = CM_Get_Device_Interface_PropertyW(interface_path, property_key, &property_type, NULL, &len, 0);
if (cr != CR_BUFFER_SMALL || property_type != expected_property_type)
return NULL;
property_value = (PBYTE)calloc(len, sizeof(BYTE));
cr = CM_Get_Device_Interface_PropertyW(interface_path, property_key, &property_type, property_value, &len, 0);
if (cr != CR_SUCCESS) {
free(property_value);
return NULL;
}
return property_value;
}
static void hid_internal_towupper(wchar_t* string)
{
for (wchar_t* p = string; *p; ++p) *p = towupper(*p);
}
static int hid_internal_extract_int_token_value(wchar_t* string, const wchar_t* token)
{
int token_value;
wchar_t* startptr, * endptr;
startptr = wcsstr(string, token);
if (!startptr)
return -1;
startptr += wcslen(token);
token_value = wcstol(startptr, &endptr, 16);
if (endptr == startptr)
return -1;
return token_value;
}
static void hid_internal_get_usb_info(struct hid_device_info* dev, DEVINST dev_node)
{
wchar_t *device_id = NULL, *hardware_ids = NULL;
device_id = hid_internal_get_devnode_property(dev_node, &DEVPKEY_Device_InstanceId, DEVPROP_TYPE_STRING);
if (!device_id)
goto end;
/* Normalize to upper case */
hid_internal_towupper(device_id);
/* Check for Xbox Common Controller class (XUSB) device.
https://docs.microsoft.com/windows/win32/xinput/directinput-and-xusb-devices
https://docs.microsoft.com/windows/win32/xinput/xinput-and-directinput
*/
if (hid_internal_extract_int_token_value(device_id, L"IG_") != -1) {
/* Get devnode parent to reach out USB device. */
if (CM_Get_Parent(&dev_node, dev_node, 0) != CR_SUCCESS)
goto end;
}
/* Get the hardware ids from devnode */
hardware_ids = hid_internal_get_devnode_property(dev_node, &DEVPKEY_Device_HardwareIds, DEVPROP_TYPE_STRING_LIST);
if (!hardware_ids)
goto end;
/* Get additional information from USB device's Hardware ID
https://docs.microsoft.com/windows-hardware/drivers/install/standard-usb-identifiers
https://docs.microsoft.com/windows-hardware/drivers/usbcon/enumeration-of-interfaces-not-grouped-in-collections
*/
for (wchar_t* hardware_id = hardware_ids; *hardware_id; hardware_id += wcslen(hardware_id) + 1) {
/* Normalize to upper case */
hid_internal_towupper(hardware_id);
if (dev->release_number == 0) {
/* USB_DEVICE_DESCRIPTOR.bcdDevice value. */
int release_number = hid_internal_extract_int_token_value(hardware_id, L"REV_");
if (release_number != -1) {
dev->release_number = (unsigned short)release_number;
}
}
if (dev->interface_number == -1) {
/* USB_INTERFACE_DESCRIPTOR.bInterfaceNumber value. */
int interface_number = hid_internal_extract_int_token_value(hardware_id, L"MI_");
if (interface_number != -1) {
dev->interface_number = interface_number;
}
}
}
/* Try to get USB device manufacturer string if not provided by HidD_GetManufacturerString. */
if (wcslen(dev->manufacturer_string) == 0) {
wchar_t* manufacturer_string = hid_internal_get_devnode_property(dev_node, &DEVPKEY_Device_Manufacturer, DEVPROP_TYPE_STRING);
if (manufacturer_string) {
free(dev->manufacturer_string);
dev->manufacturer_string = manufacturer_string;
}
}
/* Try to get USB device serial number if not provided by HidD_GetSerialNumberString. */
if (wcslen(dev->serial_number) == 0) {
DEVINST usb_dev_node = dev_node;
if (dev->interface_number != -1) {
/* Get devnode parent to reach out composite parent USB device.
https://docs.microsoft.com/windows-hardware/drivers/usbcon/enumeration-of-the-composite-parent-device
*/
if (CM_Get_Parent(&usb_dev_node, dev_node, 0) != CR_SUCCESS)
goto end;
}
/* Get the device id of the USB device. */
free(device_id);
device_id = hid_internal_get_devnode_property(usb_dev_node, &DEVPKEY_Device_InstanceId, DEVPROP_TYPE_STRING);
if (!device_id)
goto end;
/* Extract substring after last '\\' of Instance ID.
For USB devices it may contain device's serial number.
https://docs.microsoft.com/windows-hardware/drivers/install/instance-ids
*/
for (wchar_t *ptr = device_id + wcslen(device_id); ptr > device_id; --ptr) {
/* Instance ID is unique only within the scope of the bus.
For USB devices it means that serial number is not available. Skip. */
if (*ptr == L'&')
break;
if (*ptr == L'\\') {
free(dev->serial_number);
dev->serial_number = _wcsdup(ptr + 1);
break;
}
}
}
/* If we can't get the interface number, it means that there is only one interface. */
if (dev->interface_number == -1)
dev->interface_number = 0;
end:
free(device_id);
free(hardware_ids);
}
/* HidD_GetProductString/HidD_GetManufacturerString/HidD_GetSerialNumberString is not working for BLE HID devices
Request this info via dev node properties instead.
https://docs.microsoft.com/answers/questions/401236/hidd-getproductstring-with-ble-hid-device.html
*/
static void hid_internal_get_ble_info(struct hid_device_info* dev, DEVINST dev_node)
{
if (wcslen(dev->manufacturer_string) == 0) {
/* Manufacturer Name String (UUID: 0x2A29) */
wchar_t* manufacturer_string = hid_internal_get_devnode_property(dev_node, (const DEVPROPKEY*)&PKEY_DeviceInterface_Bluetooth_Manufacturer, DEVPROP_TYPE_STRING);
if (manufacturer_string) {
free(dev->manufacturer_string);
dev->manufacturer_string = manufacturer_string;
}
}
if (wcslen(dev->serial_number) == 0) {
/* Serial Number String (UUID: 0x2A25) */
wchar_t* serial_number = hid_internal_get_devnode_property(dev_node, (const DEVPROPKEY*)&PKEY_DeviceInterface_Bluetooth_DeviceAddress, DEVPROP_TYPE_STRING);
if (serial_number) {
free(dev->serial_number);
dev->serial_number = serial_number;
}
}
if (wcslen(dev->product_string) == 0) {
/* Model Number String (UUID: 0x2A24) */
wchar_t* product_string = hid_internal_get_devnode_property(dev_node, (const DEVPROPKEY*)&PKEY_DeviceInterface_Bluetooth_ModelNumber, DEVPROP_TYPE_STRING);
if (!product_string) {
DEVINST parent_dev_node = 0;
/* Fallback: Get devnode grandparent to reach out Bluetooth LE device node */
if (CM_Get_Parent(&parent_dev_node, dev_node, 0) == CR_SUCCESS) {
/* Device Name (UUID: 0x2A00) */
product_string = hid_internal_get_devnode_property(parent_dev_node, &DEVPKEY_NAME, DEVPROP_TYPE_STRING);
}
}
if (product_string) {
free(dev->product_string);
dev->product_string = product_string;
}
}
}
/* Unfortunately, HID_API_BUS_xxx constants alone aren't enough to distinguish between BLUETOOTH and BLE */
#define HID_API_BUS_FLAG_BLE 0x01
typedef struct hid_internal_detect_bus_type_result_ {
DEVINST dev_node;
hid_bus_type bus_type;
unsigned int bus_flags;
} hid_internal_detect_bus_type_result;
static hid_internal_detect_bus_type_result hid_internal_detect_bus_type(const wchar_t* interface_path)
{
wchar_t *device_id = NULL, *compatible_ids = NULL;
CONFIGRET cr;
DEVINST dev_node;
hid_internal_detect_bus_type_result result = { 0 };
/* Get the device id from interface path */
device_id = hid_internal_get_device_interface_property(interface_path, &DEVPKEY_Device_InstanceId, DEVPROP_TYPE_STRING);
if (!device_id)
goto end;
/* Open devnode from device id */
cr = CM_Locate_DevNodeW(&dev_node, (DEVINSTID_W)device_id, CM_LOCATE_DEVNODE_NORMAL);
if (cr != CR_SUCCESS)
goto end;
/* Get devnode parent */
cr = CM_Get_Parent(&dev_node, dev_node, 0);
if (cr != CR_SUCCESS)
goto end;
/* Get the compatible ids from parent devnode */
compatible_ids = hid_internal_get_devnode_property(dev_node, &DEVPKEY_Device_CompatibleIds, DEVPROP_TYPE_STRING_LIST);
if (!compatible_ids)
goto end;
/* Now we can parse parent's compatible IDs to find out the device bus type */
for (wchar_t* compatible_id = compatible_ids; *compatible_id; compatible_id += wcslen(compatible_id) + 1) {
/* Normalize to upper case */
hid_internal_towupper(compatible_id);
/* USB devices
https://docs.microsoft.com/windows-hardware/drivers/hid/plug-and-play-support
https://docs.microsoft.com/windows-hardware/drivers/install/standard-usb-identifiers */
if (wcsstr(compatible_id, L"USB") != NULL) {
result.bus_type = HID_API_BUS_USB;
break;
}
/* Bluetooth devices
https://docs.microsoft.com/windows-hardware/drivers/bluetooth/installing-a-bluetooth-device */
if (wcsstr(compatible_id, L"BTHENUM") != NULL) {
result.bus_type = HID_API_BUS_BLUETOOTH;
break;
}
/* Bluetooth LE devices */
if (wcsstr(compatible_id, L"BTHLEDEVICE") != NULL) {
result.bus_type = HID_API_BUS_BLUETOOTH;
result.bus_flags |= HID_API_BUS_FLAG_BLE;
break;
}
/* I2C devices
https://docs.microsoft.com/windows-hardware/drivers/hid/plug-and-play-support-and-power-management */
if (wcsstr(compatible_id, L"PNP0C50") != NULL) {
result.bus_type = HID_API_BUS_I2C;
break;
}
/* SPI devices
https://docs.microsoft.com/windows-hardware/drivers/hid/plug-and-play-for-spi */
if (wcsstr(compatible_id, L"PNP0C51") != NULL) {
result.bus_type = HID_API_BUS_SPI;
break;
}
}
result.dev_node = dev_node;
end:
free(device_id);
free(compatible_ids);
return result;
}
static char *hid_internal_UTF16toUTF8(const wchar_t *src)
{
char *dst = NULL;
int len = WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, src, -1, NULL, 0, NULL, NULL);
if (len) {
dst = (char*)calloc(len, sizeof(char));
if (dst == NULL) {
return NULL;
}
WideCharToMultiByte(CP_UTF8, WC_ERR_INVALID_CHARS, src, -1, dst, len, NULL, NULL);
}
return dst;
}
static wchar_t *hid_internal_UTF8toUTF16(const char *src)
{
wchar_t *dst = NULL;
int len = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, src, -1, NULL, 0);
if (len) {
dst = (wchar_t*)calloc(len, sizeof(wchar_t));
if (dst == NULL) {
return NULL;
}
MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, src, -1, dst, len);
}
return dst;
}
static struct hid_device_info *hid_internal_get_device_info(const wchar_t *path, HANDLE handle)
{
struct hid_device_info *dev = NULL; /* return object */
HIDD_ATTRIBUTES attrib;
PHIDP_PREPARSED_DATA pp_data = NULL;
HIDP_CAPS caps;
wchar_t string[MAX_STRING_WCHARS + 1];
ULONG len;
ULONG size;
hid_internal_detect_bus_type_result detect_bus_type_result;
/* Create the record. */
dev = (struct hid_device_info*)calloc(1, sizeof(struct hid_device_info));
if (dev == NULL) {
return NULL;
}
/* Fill out the record */
dev->next = NULL;
dev->path = hid_internal_UTF16toUTF8(path);
dev->interface_number = -1;
attrib.Size = sizeof(HIDD_ATTRIBUTES);
if (HidD_GetAttributes(handle, &attrib)) {
/* VID/PID */
dev->vendor_id = attrib.VendorID;
dev->product_id = attrib.ProductID;
/* Release Number */
dev->release_number = attrib.VersionNumber;
}
/* Get the Usage Page and Usage for this device. */
if (HidD_GetPreparsedData(handle, &pp_data)) {
if (HidP_GetCaps(pp_data, &caps) == HIDP_STATUS_SUCCESS) {
dev->usage_page = caps.UsagePage;
dev->usage = caps.Usage;
}
HidD_FreePreparsedData(pp_data);
}
/* detect bus type before reading string descriptors */
detect_bus_type_result = hid_internal_detect_bus_type(path);
dev->bus_type = detect_bus_type_result.bus_type;
len = dev->bus_type == HID_API_BUS_USB ? MAX_STRING_WCHARS_USB : MAX_STRING_WCHARS;
string[len] = L'\0';
size = len * sizeof(wchar_t);
/* Serial Number */
string[0] = L'\0';
HidD_GetSerialNumberString(handle, string, size);
dev->serial_number = _wcsdup(string);
/* Manufacturer String */
string[0] = L'\0';
HidD_GetManufacturerString(handle, string, size);
dev->manufacturer_string = _wcsdup(string);
/* Product String */
string[0] = L'\0';
HidD_GetProductString(handle, string, size);
dev->product_string = _wcsdup(string);
/* now, the portion that depends on string descriptors */
switch (dev->bus_type) {
case HID_API_BUS_USB:
hid_internal_get_usb_info(dev, detect_bus_type_result.dev_node);
break;
case HID_API_BUS_BLUETOOTH:
if (detect_bus_type_result.bus_flags & HID_API_BUS_FLAG_BLE)
hid_internal_get_ble_info(dev, detect_bus_type_result.dev_node);
break;
case HID_API_BUS_UNKNOWN:
case HID_API_BUS_SPI:
case HID_API_BUS_I2C:
/* shut down -Wswitch */
break;
}
return dev;
}
struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id)
{
struct hid_device_info *root = NULL; /* return object */
struct hid_device_info *cur_dev = NULL;
GUID interface_class_guid;
CONFIGRET cr;
wchar_t* device_interface_list = NULL;
DWORD len;
if (hid_init() < 0) {
/* register_global_error: global error is reset by hid_init */
return NULL;
}
/* Retrieve HID Interface Class GUID
https://docs.microsoft.com/windows-hardware/drivers/install/guid-devinterface-hid */
HidD_GetHidGuid(&interface_class_guid);
/* Get the list of all device interfaces belonging to the HID class. */
/* Retry in case of list was changed between calls to
CM_Get_Device_Interface_List_SizeW and CM_Get_Device_Interface_ListW */
do {
cr = CM_Get_Device_Interface_List_SizeW(&len, &interface_class_guid, NULL, CM_GET_DEVICE_INTERFACE_LIST_PRESENT);
if (cr != CR_SUCCESS) {
register_global_error(L"Failed to get size of HID device interface list");
break;
}
if (device_interface_list != NULL) {
free(device_interface_list);
}
device_interface_list = (wchar_t*)calloc(len, sizeof(wchar_t));
if (device_interface_list == NULL) {
register_global_error(L"Failed to allocate memory for HID device interface list");
return NULL;
}
cr = CM_Get_Device_Interface_ListW(&interface_class_guid, NULL, device_interface_list, len, CM_GET_DEVICE_INTERFACE_LIST_PRESENT);
if (cr != CR_SUCCESS && cr != CR_BUFFER_SMALL) {
register_global_error(L"Failed to get HID device interface list");
}
} while (cr == CR_BUFFER_SMALL);
if (cr != CR_SUCCESS) {
goto end_of_function;
}
/* Iterate over each device interface in the HID class, looking for the right one. */
for (wchar_t* device_interface = device_interface_list; *device_interface; device_interface += wcslen(device_interface) + 1) {
HANDLE device_handle = INVALID_HANDLE_VALUE;
HIDD_ATTRIBUTES attrib;
/* Open read-only handle to the device */
device_handle = open_device(device_interface, FALSE);
/* Check validity of device_handle. */
if (device_handle == INVALID_HANDLE_VALUE) {
/* Unable to open the device. */
continue;
}
/* Get the Vendor ID and Product ID for this device. */
attrib.Size = sizeof(HIDD_ATTRIBUTES);
if (!HidD_GetAttributes(device_handle, &attrib)) {
goto cont_close;
}
/* Check the VID/PID to see if we should add this
device to the enumeration list. */
if ((vendor_id == 0x0 || attrib.VendorID == vendor_id) &&
(product_id == 0x0 || attrib.ProductID == product_id)) {
/* VID/PID match. Create the record. */
struct hid_device_info *tmp = hid_internal_get_device_info(device_interface, device_handle);
if (tmp == NULL) {
goto cont_close;
}
if (cur_dev) {
cur_dev->next = tmp;
}
else {
root = tmp;
}
cur_dev = tmp;
}
cont_close:
CloseHandle(device_handle);
}
if (root == NULL) {
if (vendor_id == 0 && product_id == 0) {
register_global_error(L"No HID devices found in the system.");
} else {
register_global_error(L"No HID devices with requested VID/PID found in the system.");
}
}
end_of_function:
free(device_interface_list);
return root;
}
void HID_API_EXPORT HID_API_CALL hid_free_enumeration(struct hid_device_info *devs)
{
/* TODO: Merge this with the Linux version. This function is platform-independent. */
struct hid_device_info *d = devs;
while (d) {
struct hid_device_info *next = d->next;
free(d->path);
free(d->serial_number);
free(d->manufacturer_string);
free(d->product_string);
free(d);
d = next;
}
}
HID_API_EXPORT hid_device * HID_API_CALL hid_open(unsigned short vendor_id, unsigned short product_id, const wchar_t *serial_number)
{
/* TODO: Merge this functions with the Linux version. This function should be platform independent. */
struct hid_device_info *devs, *cur_dev;
const char *path_to_open = NULL;
hid_device *handle = NULL;
/* register_global_error: global error is reset by hid_enumerate/hid_init */
devs = hid_enumerate(vendor_id, product_id);
if (!devs) {
/* register_global_error: global error is already set by hid_enumerate */
return NULL;
}
cur_dev = devs;
while (cur_dev) {
if (cur_dev->vendor_id == vendor_id &&
cur_dev->product_id == product_id) {
if (serial_number) {
if (cur_dev->serial_number && wcscmp(serial_number, cur_dev->serial_number) == 0) {
path_to_open = cur_dev->path;
break;
}
}
else {
path_to_open = cur_dev->path;
break;
}
}
cur_dev = cur_dev->next;
}
if (path_to_open) {
/* Open the device */
handle = hid_open_path(path_to_open);
} else {
register_global_error(L"Device with requested VID/PID/(SerialNumber) not found");
}
hid_free_enumeration(devs);
return handle;
}
HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path)
{
hid_device *dev = NULL;
wchar_t* interface_path = NULL;
HANDLE device_handle = INVALID_HANDLE_VALUE;
PHIDP_PREPARSED_DATA pp_data = NULL;
HIDP_CAPS caps;
if (hid_init() < 0) {
/* register_global_error: global error is reset by hid_init */
goto end_of_function;
}
interface_path = hid_internal_UTF8toUTF16(path);
if (!interface_path) {
register_global_error(L"Path conversion failure");
goto end_of_function;
}
/* Open a handle to the device */
device_handle = open_device(interface_path, TRUE);
/* Check validity of write_handle. */
if (device_handle == INVALID_HANDLE_VALUE) {
/* System devices, such as keyboards and mice, cannot be opened in
read-write mode, because the system takes exclusive control over