/*******************************************************

HIDAPI - Multi-Platform library for

communication with HID devices.

Alan Ott

Signal 11 Software

8/22/2009

Copyright 2009, 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 .

********************************************************/

#include "../../SDL_internal.h"

#ifdef SDL_JOYSTICK_HIDAPI

#include <windows.h>

#if 0 /* can cause redefinition errors on some toolchains */

#ifdef __MINGW32__

#include <ntdef.h>

#include <winbase.h>

#endif

#ifdef __CYGWIN__

#include <ntdef.h>

#define _wcsdup wcsdup

#endif

#endif /* */

#ifndef _NTDEF_

typedef LONG NTSTATUS;

#endif

/* SDL C runtime functions */

#include "SDL_stdinc.h"

#define calloc SDL_calloc

#define free SDL_free

#define malloc SDL_malloc

#define memcpy SDL_memcpy

#define memset SDL_memset

#define strcmp SDL_strcmp

#define strlen SDL_strlen

#define strncpy SDL_strlcpy

#define strstr SDL_strstr

#define strtol SDL_strtol

#define wcscmp SDL_wcscmp

#define _wcsdup SDL_wcsdup

/* The maximum number of characters that can be passed into the

HidD_Get*String() functions without it failing.*/

#define MAX_STRING_WCHARS 0xFFF

/*#define HIDAPI_USE_DDK*/

#ifdef __cplusplus

extern "C" {

#endif

#include <setupapi.h>

#include <winioctl.h>

#ifdef HIDAPI_USE_DDK

#include <hidsdi.h>

#endif

/* Copied from inc/ddk/hidclass.h, part of the Windows DDK. */

#define HID_OUT_CTL_CODE(id) \

CTL_CODE(FILE_DEVICE_KEYBOARD, (id), METHOD_OUT_DIRECT, FILE_ANY_ACCESS)

#define IOCTL_HID_GET_FEATURE HID_OUT_CTL_CODE(100)

#ifdef __cplusplus

} /* extern "C" */

#endif

#include <stdio.h>

#include <stdlib.h>

#include "../hidapi/hidapi.h"

#undef MIN

#define MIN(x,y) ((x) < (y)? (x): (y))

#ifdef _MSC_VER

/* Thanks Microsoft, but I know how to use strncpy(). */

#pragma warning(disable:4996)

#endif

#ifdef __cplusplus

extern "C" {

#endif

#ifndef HIDAPI_USE_DDK

/* Since we're not building with the DDK, and the HID header

files aren't part of the SDK, we have to define all this

stuff here. In lookup_functions(), the function pointers

defined below are set. */

typedef struct _HIDD_ATTRIBUTES{

} HIDD_ATTRIBUTES, *PHIDD_ATTRIBUTES;

typedef USHORT USAGE;

typedef struct _HIDP_CAPS {

} HIDP_CAPS, *PHIDP_CAPS;

typedef void* PHIDP_PREPARSED_DATA;

#define HIDP_STATUS_SUCCESS 0x110000

typedef BOOLEAN (__stdcall *HidD_GetAttributes_)(HANDLE device, PHIDD_ATTRIBUTES attrib);

typedef BOOLEAN (__stdcall *HidD_GetSerialNumberString_)(HANDLE device, PVOID buffer, ULONG buffer_len);

typedef BOOLEAN (__stdcall *HidD_GetManufacturerString_)(HANDLE handle, PVOID buffer, ULONG buffer_len);

typedef BOOLEAN (__stdcall *HidD_GetProductString_)(HANDLE handle, PVOID buffer, ULONG buffer_len);

typedef BOOLEAN (__stdcall *HidD_SetFeature_)(HANDLE handle, PVOID data, ULONG length);

typedef BOOLEAN (__stdcall *HidD_GetFeature_)(HANDLE handle, PVOID data, ULONG length);

typedef BOOLEAN (__stdcall *HidD_GetIndexedString_)(HANDLE handle, ULONG string_index, PVOID buffer, ULONG buffer_len);

typedef BOOLEAN (__stdcall *HidD_GetPreparsedData_)(HANDLE handle, PHIDP_PREPARSED_DATA *preparsed_data);

typedef BOOLEAN (__stdcall *HidD_FreePreparsedData_)(PHIDP_PREPARSED_DATA preparsed_data);

typedef NTSTATUS (__stdcall *HidP_GetCaps_)(PHIDP_PREPARSED_DATA preparsed_data, HIDP_CAPS *caps);

typedef BOOLEAN (__stdcall *HidD_SetNumInputBuffers_)(HANDLE handle, ULONG number_buffers);

typedef BOOLEAN(__stdcall *HidD_SetOutputReport_ )(HANDLE handle, PVOID buffer, ULONG buffer_len);

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_GetIndexedString_ HidD_GetIndexedString;

static HidD_GetPreparsedData_ HidD_GetPreparsedData;

static HidD_FreePreparsedData_ HidD_FreePreparsedData;

static HidP_GetCaps_ HidP_GetCaps;

static HidD_SetNumInputBuffers_ HidD_SetNumInputBuffers;

static HidD_SetOutputReport_ HidD_SetOutputReport;

static HMODULE lib_handle = NULL;

static BOOLEAN initialized = FALSE;

#endif /* HIDAPI_USE_DDK */

struct hid_device_ {

};

static hid_device *new_hid_device()

{

hid_device *dev = (hid_device*) calloc(1, sizeof(hid_device));

dev->device_handle = INVALID_HANDLE_VALUE;

dev->blocking = TRUE;

dev->output_report_length = 0;

dev->input_report_length = 0;

dev->last_error_str = NULL;

dev->last_error_num = 0;

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);

return dev;

}

static void free_hid_device(hid_device *dev)

{

CloseHandle(dev->ol.hEvent);

CloseHandle(dev->device_handle);

LocalFree(dev->last_error_str);

free(dev->read_buf);

free(dev);

}

static void register_error(hid_device *device, const char *op)

{

WCHAR *ptr, *msg;

DWORD count = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |

FORMAT_MESSAGE_FROM_SYSTEM |

FORMAT_MESSAGE_IGNORE_INSERTS,

NULL,

GetLastError(),

MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),

(LPWSTR)&msg, 0/*sz*/,

NULL);

if (!count)

return;

/* Get rid of the CR and LF that FormatMessage() sticks at the

end of the message. Thanks Microsoft! */

ptr = msg;

while (*ptr) {

if (*ptr == '\r') {

*ptr = 0x0000;

break;

}

ptr++;

}

/* Store the message off in the Device entry so that

the hid_error() function can pick it up. */

LocalFree(device->last_error_str);

device->last_error_str = msg;

}

#ifndef HIDAPI_USE_DDK

static int lookup_functions()

{

lib_handle = LoadLibraryA("hid.dll");

if (lib_handle) {

#define RESOLVE(x) x = (x##_)GetProcAddress(lib_handle, #x); if (!x) return -1;

RESOLVE(HidD_GetAttributes);

RESOLVE(HidD_GetSerialNumberString);

RESOLVE(HidD_GetManufacturerString);

RESOLVE(HidD_GetProductString);

RESOLVE(HidD_SetFeature);

RESOLVE(HidD_GetFeature);

RESOLVE(HidD_GetIndexedString);

RESOLVE(HidD_GetPreparsedData);

RESOLVE(HidD_FreePreparsedData);

RESOLVE(HidP_GetCaps);

RESOLVE(HidD_SetNumInputBuffers);

RESOLVE(HidD_SetOutputReport);

#undef RESOLVE

}

else

return -1;

return 0;

}

#endif

static HANDLE open_device(const char *path, BOOL enumerate, BOOL bExclusive )

{

HANDLE handle;

// Opening with access 0 causes keyboards to stop responding in some system configurations

// http://steamcommunity.com/discussions/forum/1/1843493219428923893

// Thanks to co-wie (Ka-wei Low <kawei@mac.com>) for help narrowing down the problem on his system

//DWORD desired_access = (enumerate)? 0: (GENERIC_WRITE | GENERIC_READ);

DWORD desired_access = ( GENERIC_WRITE | GENERIC_READ );

DWORD share_mode = bExclusive ? 0 : ( FILE_SHARE_READ | FILE_SHARE_WRITE );

handle = CreateFileA(path,

desired_access,

share_mode,

NULL,

OPEN_EXISTING,

FILE_FLAG_OVERLAPPED,/*FILE_ATTRIBUTE_NORMAL,*/

0);

return handle;

}

int HID_API_EXPORT hid_init(void)

{

#ifndef HIDAPI_USE_DDK

if (!initialized) {

if (lookup_functions() < 0) {

hid_exit();

return -1;

}

initialized = TRUE;

}

#endif

return 0;

}

int HID_API_EXPORT hid_exit(void)

{

#ifndef HIDAPI_USE_DDK

if (lib_handle)

FreeLibrary(lib_handle);

lib_handle = NULL;

initialized = FALSE;

#endif

return 0;

}

int hid_blacklist(unsigned short vendor_id, unsigned short product_id)

{

// Corsair Gaming keyboard - Causes deadlock when asking for device details

if ( vendor_id == 0x1B1C && product_id == 0x1B3D )

{

return 1;

}

// SPEEDLINK COMPETITION PRO - turns into an Android controller when enumerated

if ( vendor_id == 0x0738 && product_id == 0x2217 )

{

return 1;

}

return 0;

}

struct hid_device_info HID_API_EXPORT * HID_API_CALL hid_enumerate(unsigned short vendor_id, unsigned short product_id)

{

BOOL res;

struct hid_device_info *root = NULL; /* return object */

struct hid_device_info *cur_dev = NULL;

/* Windows objects for interacting with the driver. */

GUID InterfaceClassGuid = {0x4d1e55b2, 0xf16f, 0x11cf, {0x88, 0xcb, 0x00, 0x11, 0x11, 0x00, 0x00, 0x30} };

SP_DEVINFO_DATA devinfo_data;

SP_DEVICE_INTERFACE_DATA device_interface_data;

SP_DEVICE_INTERFACE_DETAIL_DATA_A *device_interface_detail_data = NULL;

HDEVINFO device_info_set = INVALID_HANDLE_VALUE;

int device_index = 0;

if (hid_init() < 0)

return NULL;

/* Initialize the Windows objects. */

memset(&devinfo_data, 0x0, sizeof(devinfo_data));

devinfo_data.cbSize = sizeof(SP_DEVINFO_DATA);

device_interface_data.cbSize = sizeof(SP_DEVICE_INTERFACE_DATA);

/* Get information for all the devices belonging to the HID class. */

device_info_set = SetupDiGetClassDevsA(&InterfaceClassGuid, NULL, NULL, DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);

/* Iterate over each device in the HID class, looking for the right one. */

for (;;) {

HANDLE write_handle = INVALID_HANDLE_VALUE;

DWORD required_size = 0;

HIDD_ATTRIBUTES attrib;

res = SetupDiEnumDeviceInterfaces(device_info_set,

NULL,

&InterfaceClassGuid,

device_index,

&device_interface_data);

if (!res) {

/* A return of FALSE from this function means that

there are no more devices. */

break;

}

/* Call with 0-sized detail size, and let the function

tell us how long the detail struct needs to be. The

size is put in &required_size. */

res = SetupDiGetDeviceInterfaceDetailA(device_info_set,

&device_interface_data,

NULL,

0,

&required_size,

NULL);

/* Allocate a long enough structure for device_interface_detail_data. */

device_interface_detail_data = (SP_DEVICE_INTERFACE_DETAIL_DATA_A*) malloc(required_size);

device_interface_detail_data->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA_A);

/* Get the detailed data for this device. The detail data gives us

the device path for this device, which is then passed into

CreateFile() to get a handle to the device. */

res = SetupDiGetDeviceInterfaceDetailA(device_info_set,

&device_interface_data,

device_interface_detail_data,

required_size,

NULL,

NULL);

if (!res) {

/* register_error(dev, "Unable to call SetupDiGetDeviceInterfaceDetail");

Continue to the next device. */

goto cont;

}

/* Make sure this device is of Setup Class "HIDClass" and has a

driver bound to it. */

/* In the main HIDAPI tree this is a loop which will erroneously open

devices that aren't HID class. Please preserve this delta if we ever

update to take new changes */

{

char driver_name[256];

/* Populate devinfo_data. This function will return failure

when there are no more interfaces left. */

res = SetupDiEnumDeviceInfo(device_info_set, device_index, &devinfo_data);

if (!res)

goto cont;

res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data,

SPDRP_CLASS, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL);

if (!res)

goto cont;

if (strcmp(driver_name, "HIDClass") == 0) {

/* See if there's a driver bound. */

res = SetupDiGetDeviceRegistryPropertyA(device_info_set, &devinfo_data,

SPDRP_DRIVER, NULL, (PBYTE)driver_name, sizeof(driver_name), NULL);

if (!res)

goto cont;

}

else

{

goto cont;

}

}

//wprintf(L"HandleName: %s\n", device_interface_detail_data->DevicePath);

/* Open a handle to the device */

write_handle = open_device(device_interface_detail_data->DevicePath, TRUE, FALSE);

/* Check validity of write_handle. */

if (write_handle == INVALID_HANDLE_VALUE) {

/* Unable to open the device. */

//register_error(dev, "CreateFile");

goto cont_close;

}

/* Get the Vendor ID and Product ID for this device. */

attrib.Size = sizeof(HIDD_ATTRIBUTES);

HidD_GetAttributes(write_handle, &attrib);

//wprintf(L"Product/Vendor: %x %x\n", attrib.ProductID, attrib.VendorID);

/* 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) &&

!hid_blacklist(attrib.VendorID, attrib.ProductID)) {

#define WSTR_LEN 512

const char *str;

struct hid_device_info *tmp;

PHIDP_PREPARSED_DATA pp_data = NULL;

HIDP_CAPS caps;

BOOLEAN hidp_res;

NTSTATUS nt_res;

wchar_t wstr[WSTR_LEN]; /* TODO: Determine Size */

size_t len;

/* VID/PID match. Create the record. */

tmp = (struct hid_device_info*) calloc(1, sizeof(struct hid_device_info));

if (cur_dev) {

cur_dev->next = tmp;

}

else {

root = tmp;

}

cur_dev = tmp;

/* Get the Usage Page and Usage for this device. */

hidp_res = HidD_GetPreparsedData(write_handle, &pp_data);

if (hidp_res) {

nt_res = HidP_GetCaps(pp_data, &caps);

if (nt_res == HIDP_STATUS_SUCCESS) {

cur_dev->usage_page = caps.UsagePage;

cur_dev->usage = caps.Usage;

}

HidD_FreePreparsedData(pp_data);

}

/* Fill out the record */

cur_dev->next = NULL;

str = device_interface_detail_data->DevicePath;

if (str) {

len = strlen(str);

cur_dev->path = (char*) calloc(len+1, sizeof(char));

strncpy(cur_dev->path, str, len+1);

cur_dev->path[len] = '\0';

}

else

cur_dev->path = NULL;

/* Serial Number */

hidp_res = HidD_GetSerialNumberString(write_handle, wstr, sizeof(wstr));

wstr[WSTR_LEN-1] = 0x0000;

if (hidp_res) {

cur_dev->serial_number = _wcsdup(wstr);

}

/* Manufacturer String */

hidp_res = HidD_GetManufacturerString(write_handle, wstr, sizeof(wstr));

wstr[WSTR_LEN-1] = 0x0000;

if (hidp_res) {

cur_dev->manufacturer_string = _wcsdup(wstr);

}

/* Product String */

hidp_res = HidD_GetProductString(write_handle, wstr, sizeof(wstr));

wstr[WSTR_LEN-1] = 0x0000;

if (hidp_res) {

cur_dev->product_string = _wcsdup(wstr);

}

/* VID/PID */

cur_dev->vendor_id = attrib.VendorID;

cur_dev->product_id = attrib.ProductID;

/* Release Number */

cur_dev->release_number = attrib.VersionNumber;

/* Interface Number. It can sometimes be parsed out of the path

on Windows if a device has multiple interfaces. See

http://msdn.microsoft.com/en-us/windows/hardware/gg487473 or

search for "Hardware IDs for HID Devices" at MSDN. If it's not

in the path, it's set to -1. */

cur_dev->interface_number = -1;

if (cur_dev->path) {

char *interface_component = strstr(cur_dev->path, "&mi_");

if (interface_component) {

char *hex_str = interface_component + 4;

char *endptr = NULL;

cur_dev->interface_number = strtol(hex_str, &endptr, 16);

if (endptr == hex_str) {

/* The parsing failed. Set interface_number to -1. */

cur_dev->interface_number = -1;

}

}

}

}

cont_close:

CloseHandle(write_handle);

cont:

/* We no longer need the detail data. It can be freed */

free(device_interface_detail_data);

device_index++;

}

/* Close the device information handle. */

SetupDiDestroyDeviceInfoList(device_info_set);

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;

devs = hid_enumerate(vendor_id, product_id);

cur_dev = devs;

while (cur_dev) {

if (cur_dev->vendor_id == vendor_id &&

cur_dev->product_id == product_id) {

if (serial_number) {

if (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, 0);

}

hid_free_enumeration(devs);

return handle;

}

HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path, int bExclusive)

{

hid_device *dev;

HIDP_CAPS caps;

PHIDP_PREPARSED_DATA pp_data = NULL;

BOOLEAN res;

NTSTATUS nt_res;

if (hid_init() < 0) {

return NULL;

}

dev = new_hid_device();

/* Open a handle to the device */

dev->device_handle = open_device(path, FALSE, bExclusive);

/* Check validity of write_handle. */

if (dev->device_handle == INVALID_HANDLE_VALUE) {

/* Unable to open the device. */

register_error(dev, "CreateFile");

goto err;

}

/* Set the Input Report buffer size to 64 reports. */

res = HidD_SetNumInputBuffers(dev->device_handle, 64);

if (!res) {

register_error(dev, "HidD_SetNumInputBuffers");

goto err;

}

/* Get the Input Report length for the device. */

res = HidD_GetPreparsedData(dev->device_handle, &pp_data);

if (!res) {

register_error(dev, "HidD_GetPreparsedData");

goto err;

}

nt_res = HidP_GetCaps(pp_data, &caps);

if (nt_res != HIDP_STATUS_SUCCESS) {

register_error(dev, "HidP_GetCaps");

goto err_pp_data;

}

dev->output_report_length = caps.OutputReportByteLength;

dev->input_report_length = caps.InputReportByteLength;

HidD_FreePreparsedData(pp_data);

dev->read_buf = (char*) malloc(dev->input_report_length);

return dev;

err_pp_data:

HidD_FreePreparsedData(pp_data);

err:

free_hid_device(dev);

return NULL;

}

int HID_API_EXPORT HID_API_CALL hid_write_output_report(hid_device *dev, const unsigned char *data, size_t length)

{

BOOL res;

res = HidD_SetOutputReport(dev->device_handle, (void *)data, (ULONG)length);

if (res)

return (int)length;

else

return -1;

}

int HID_API_EXPORT HID_API_CALL hid_write(hid_device *dev, const unsigned char *data, size_t length)

{

DWORD bytes_written;

BOOL res;

size_t stashed_length = length;

OVERLAPPED ol;

unsigned char *buf;

memset(&ol, 0, sizeof(ol));

/* Make sure the right number of bytes are passed to WriteFile. Windows

expects the number of bytes which are in the _longest_ report (plus

one for the report number) bytes even if the data is a report

which is shorter than that. Windows gives us this value in

caps.OutputReportByteLength. If a user passes in fewer bytes than this,

create a temporary buffer which is the proper size. */

if (length >= dev->output_report_length) {

/* The user passed the right number of bytes. Use the buffer as-is. */

buf = (unsigned char *) data;

} else {

/* Create a temporary buffer and copy the user's data

into it, padding the rest with zeros. */

buf = (unsigned char *) malloc(dev->output_report_length);

memcpy(buf, data, length);

memset(buf + length, 0, dev->output_report_length - length);

length = dev->output_report_length;

}

if (length > 512)

{

return hid_write_output_report( dev, data, stashed_length );

}

else

{

res = WriteFile( dev->device_handle, buf, ( DWORD ) length, NULL, &ol );

if (!res) {

if (GetLastError() != ERROR_IO_PENDING) {

/* WriteFile() failed. Return error. */

register_error(dev, "WriteFile");

bytes_written = (DWORD) -1;

goto end_of_function;

}

}

/* Wait here until the write is done. This makes

hid_write() synchronous. */

res = GetOverlappedResult(dev->device_handle, &ol, &bytes_written, TRUE/*wait*/);

if (!res) {

/* The Write operation failed. */

register_error(dev, "WriteFile");

bytes_written = (DWORD) -1;

goto end_of_function;

}

}

end_of_function:

if (buf != data)

free(buf);

return bytes_written;

}

int HID_API_EXPORT HID_API_CALL hid_read_timeout(hid_device *dev, unsigned char *data, size_t length, int milliseconds)

{

DWORD bytes_read = 0;

size_t copy_len = 0;

BOOL res;

/* Copy the handle for convenience. */

HANDLE ev = dev->ol.hEvent;

if (!dev->read_pending) {

/* Start an Overlapped I/O read. */

dev->read_pending = TRUE;

memset(dev->read_buf, 0, dev->input_report_length);

ResetEvent(ev);

res = ReadFile(dev->device_handle, dev->read_buf, (DWORD)dev->input_report_length, &bytes_read, &dev->ol);

if (!res) {

if (GetLastError() != ERROR_IO_PENDING) {

/* ReadFile() has failed.

Clean up and return error. */

CancelIo(dev->device_handle);

dev->read_pending = FALSE;

goto end_of_function;

}

}

}

if (milliseconds >= 0) {

/* See if there is any data yet. */

res = WaitForSingleObject(ev, milliseconds);

if (res != WAIT_OBJECT_0) {

/* There was no data this time. Return zero bytes available,

but leave the Overlapped I/O running. */

return 0;

}

}

/* Either WaitForSingleObject() told us that ReadFile has completed, or

we are in non-blocking mode. Get the number of bytes read. The actual

data has been copied to the data[] array which was passed to ReadFile(). */

res = GetOverlappedResult(dev->device_handle, &dev->ol, &bytes_read, TRUE/*wait*/);

/* Set pending back to false, even if GetOverlappedResult() returned error. */

dev->read_pending = FALSE;

if (res && bytes_read > 0) {

if (dev->read_buf[0] == 0x0) {

/* If report numbers aren't being used, but Windows sticks a report

number (0x0) on the beginning of the report anyway. To make this

work like the other platforms, and to make it work more like the

HID spec, we'll skip over this byte. */

bytes_read--;

copy_len = length > bytes_read ? bytes_read : length;

memcpy(data, dev->read_buf+1, copy_len);

}

else {

/* Copy the whole buffer, report number and all. */

copy_len = length > bytes_read ? bytes_read : length;

memcpy(data, dev->read_buf, copy_len);

}

}

end_of_function:

if (!res) {

register_error(dev, "GetOverlappedResult");

return -1;

}

return (int)copy_len;

}

int HID_API_EXPORT HID_API_CALL hid_read(hid_device *dev, unsigned char *data, size_t length)

{

return hid_read_timeout(dev, data, length, (dev->blocking)? -1: 0);

}

int HID_API_EXPORT HID_API_CALL hid_set_nonblocking(hid_device *dev, int nonblock)

{

dev->blocking = !nonblock;

return 0; /* Success */

}

int HID_API_EXPORT HID_API_CALL hid_send_feature_report(hid_device *dev, const unsigned char *data, size_t length)

{

BOOL res = HidD_SetFeature(dev->device_handle, (PVOID)data, (ULONG)length);

if (!res) {

register_error(dev, "HidD_SetFeature");

return -1;

}

return (int)length;

}

int HID_API_EXPORT HID_API_CALL hid_get_feature_report(hid_device *dev, unsigned char *data, size_t length)

{

BOOL res;

#if 0

res = HidD_GetFeature(dev->device_handle, (PVOID)data, (ULONG)length);

if (!res) {

register_error(dev, "HidD_GetFeature");

return -1;

}

return 0; /* HidD_GetFeature() doesn't give us an actual length, unfortunately */

#else

DWORD bytes_returned;

OVERLAPPED ol;

memset(&ol, 0, sizeof(ol));

res = DeviceIoControl(dev->device_handle,

IOCTL_HID_GET_FEATURE,

data, (DWORD)length,

data, (DWORD)length,

&bytes_returned, &ol);

if (!res) {

if (GetLastError() != ERROR_IO_PENDING) {

/* DeviceIoControl() failed. Return error. */

register_error(dev, "Send Feature Report DeviceIoControl");

return -1;

}

}

/* Wait here until the write is done. This makes

hid_get_feature_report() synchronous. */

res = GetOverlappedResult(dev->device_handle, &ol, &bytes_returned, TRUE/*wait*/);

if (!res) {

/* The operation failed. */

register_error(dev, "Send Feature Report GetOverLappedResult");

return -1;

}

/* bytes_returned does not include the first byte which contains the

report ID. The data buffer actually contains one more byte than

bytes_returned. */

bytes_returned++;

return bytes_returned;

#endif

}

void HID_API_EXPORT HID_API_CALL hid_close(hid_device *dev)

{

if (!dev)

return;

CancelIo(dev->device_handle);

free_hid_device(dev);

}

int HID_API_EXPORT_CALL HID_API_CALL hid_get_manufacturer_string(hid_device *dev, wchar_t *string, size_t maxlen)

{

BOOL res;

res = HidD_GetManufacturerString(dev->device_handle, string, (ULONG)(sizeof(wchar_t) * MIN(maxlen, MAX_STRING_WCHARS)));

if (!res) {

register_error(dev, "HidD_GetManufacturerString");

return -1;

}

return 0;

}

int HID_API_EXPORT_CALL HID_API_CALL hid_get_product_string(hid_device *dev, wchar_t *string, size_t maxlen)

{

BOOL res;

res = HidD_GetProductString(dev->device_handle, string, (ULONG)(sizeof(wchar_t) * MIN(maxlen, MAX_STRING_WCHARS)));

if (!res) {

register_error(dev, "HidD_GetProductString");

return -1;

}

return 0;

}

int HID_API_EXPORT_CALL HID_API_CALL hid_get_serial_number_string(hid_device *dev, wchar_t *string, size_t maxlen)

{

BOOL res;

res = HidD_GetSerialNumberString(dev->device_handle, string, (ULONG)(sizeof(wchar_t) * MIN(maxlen, MAX_STRING_WCHARS)));

if (!res) {

register_error(dev, "HidD_GetSerialNumberString");

return -1;

}

return 0;

}

int HID_API_EXPORT_CALL HID_API_CALL hid_get_indexed_string(hid_device *dev, int string_index, wchar_t *string, size_t maxlen)

{

BOOL res;

res = HidD_GetIndexedString(dev->device_handle, string_index, string, (ULONG)(sizeof(wchar_t) * MIN(maxlen, MAX_STRING_WCHARS)));

if (!res) {

register_error(dev, "HidD_GetIndexedString");

return -1;

}

return 0;

}

HID_API_EXPORT const wchar_t * HID_API_CALL hid_error(hid_device *dev)

{

return (wchar_t*)dev->last_error_str;

}

#if 0

/*#define PICPGM*/

/*#define S11*/

#define P32

#ifdef S11

unsigned short VendorID = 0xa0a0;

unsigned short ProductID = 0x0001;

#endif

#ifdef P32

unsigned short VendorID = 0x04d8;

unsigned short ProductID = 0x3f;

#endif

#ifdef PICPGM

unsigned short VendorID = 0x04d8;

unsigned short ProductID = 0x0033;

#endif

int __cdecl main(int argc, char* argv[])

{

int res;

unsigned char buf[65];

UNREFERENCED_PARAMETER(argc);

UNREFERENCED_PARAMETER(argv);

/* Set up the command buffer. */

memset(buf,0x00,sizeof(buf));

buf[0] = 0;

buf[1] = 0x81;

/* Open the device. */

int handle = open(VendorID, ProductID, L"12345");

if (handle < 0)

printf("unable to open device\n");

/* Toggle LED (cmd 0x80) */

buf[1] = 0x80;

res = write(handle, buf, 65);

if (res < 0)

printf("Unable to write()\n");

/* Request state (cmd 0x81) */

buf[1] = 0x81;

write(handle, buf, 65);

if (res < 0)

printf("Unable to write() (2)\n");

/* Read requested state */

read(handle, buf, 65);

if (res < 0)

printf("Unable to read()\n");