hid_win.c

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/*
 HIDAPI - Multi-Platform library for communication with HID devices.
 
 Copyright (c) 2009 by Alan Ott, Signal 11 Software (8/22/2009)
 All Rights Reserved.
 
 Changes for use with SX Filter Wheel INDI Driver by CloudMakers - 11/6/2012
 
 This program is free software; you can redistribute it and/or modify it
 under the terms of the GNU General Public License as published by the Free
 Software Foundation; either version 2 of the License, or (at your option)
 any later version.
 
 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 more details.
 
 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59
 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 The full GNU General Public License is included in this distribution in the
 file called LICENSE.
 
 These files may also be found in the public source code repository located:
 http://github.com/signal11/hidapi
*/
 
#include <windows.h>
 
#ifndef _NTDEF_
typedef LONG NTSTATUS;
#endif
 
#ifdef __MINGW32__
#include <ntdef.h>
#include <winbase.h>
#endif
 
#ifdef __CYGWIN__
#include <ntdef.h>
#define _wcsdup wcsdup
#endif
 
//#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 "indi_hidapi.h"
 
#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
{
    ULONG Size;
    USHORT VendorID;
    USHORT ProductID;
    USHORT VersionNumber;
} HIDD_ATTRIBUTES, *PHIDD_ATTRIBUTES;
 
typedef USHORT USAGE;
typedef struct _HIDP_CAPS
{
    USAGE Usage;
    USAGE UsagePage;
    USHORT InputReportByteLength;
    USHORT OutputReportByteLength;
    USHORT FeatureReportByteLength;
    USHORT Reserved[17];
    USHORT fields_not_used_by_hidapi[10];
} 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);
 
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 HMODULE lib_handle  = NULL;
static BOOLEAN initialized = FALSE;
#endif // HIDAPI_USE_DDK
 
struct hid_device_
{
    HANDLE device_handle;
    BOOL blocking;
    USHORT output_report_length;
    size_t input_report_length;
    void *last_error_str;
    DWORD last_error_num;
    BOOL read_pending;
    char *read_buf;
    OVERLAPPED ol;
};
 
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 register_error(hid_device *device, const char *op)
{
    WCHAR *ptr, *msg;
 
    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);
 
    // 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);
#undef RESOLVE
    }
    else
        return -1;
 
    return 0;
}
#endif
 
static HANDLE open_device(const char *path, BOOL enumerate)
{
    HANDLE handle;
    DWORD desired_access = (enumerate) ? 0 : (GENERIC_WRITE | GENERIC_READ);
    DWORD share_mode     = (enumerate) ? FILE_SHARE_READ | FILE_SHARE_WRITE : FILE_SHARE_READ;
 
    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;
}
 
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;
    int i;
 
    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.
        for (i = 0;; i++)
        {
            char driver_name[256];
 
            // Populate devinfo_data. This function will return failure
            // when there are no more interfaces left.
            res = SetupDiEnumDeviceInfo(device_info_set, i, &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)
                    break;
            }
        }
 
        //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);
 
        // 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 && product_id == 0x0) || (attrib.VendorID == vendor_id && attrib.ProductID == product_id))
        {
#define WSTR_LEN 512
            const char *str;
            struct hid_device_info *tmp;
            PHIDP_PREPARSED_DATA pp_data = NULL;
            HIDP_CAPS caps;
            BOOLEAN 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.
            res = HidD_GetPreparsedData(write_handle, &pp_data);
            if (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 */
            res                = HidD_GetSerialNumberString(write_handle, wstr, sizeof(wstr));
            wstr[WSTR_LEN - 1] = 0x0000;
            if (res)
            {
                cur_dev->serial_number = _wcsdup(wstr);
            }
 
            /* Manufacturer String */
            res                = HidD_GetManufacturerString(write_handle, wstr, sizeof(wstr));
            wstr[WSTR_LEN - 1] = 0x0000;
            if (res)
            {
                cur_dev->manufacturer_string = _wcsdup(wstr);
            }
 
            /* Product String */
            res                = HidD_GetProductString(write_handle, wstr, sizeof(wstr));
            wstr[WSTR_LEN - 1] = 0x0000;
            if (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);
    }
 
    hid_free_enumeration(devs);
 
    return handle;
}
 
HID_API_EXPORT hid_device *HID_API_CALL hid_open_path(const char *path)
{
    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);
 
    // Check validity of write_handle.
    if (dev->device_handle == INVALID_HANDLE_VALUE)
    {
        // Unable to open the device.
        register_error(dev, "CreateFile");
        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:
    CloseHandle(dev->device_handle);
    free(dev);
    return NULL;
}
 
int HID_API_EXPORT HID_API_CALL hid_write(hid_device *dev, const unsigned char *data, size_t length)
{
    DWORD bytes_written;
    BOOL res;
 
    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;
    }
 
    res = WriteFile(dev->device_handle, buf, length, NULL, &ol);
 
    if (!res)
    {
        if (GetLastError() != ERROR_IO_PENDING)
        {
            // WriteFile() failed. Return error.
            register_error(dev, "WriteFile");
            bytes_written = -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 = -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;
    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, 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. */
            size_t copy_len;
            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. */
            size_t 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 bytes_read;
}
 
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, length);
    if (!res)
    {
        register_error(dev, "HidD_SetFeature");
        return -1;
    }
 
    return 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, data, 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, length, data, 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;
    }
    return bytes_returned;
#endif
}
 
void HID_API_EXPORT HID_API_CALL hid_close(hid_device *dev)
{
    if (!dev)
        return;
    CancelIo(dev->device_handle);
    CloseHandle(dev->ol.hEvent);
    CloseHandle(dev->device_handle);
    LocalFree(dev->last_error_str);
    free(dev->read_buf);
    free(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, 2 * maxlen);
    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, 2 * maxlen);
    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, 2 * maxlen);
    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, 2 * maxlen);
    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;
}
 
//#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
 
#if 0
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");
 
    // Print out the returned buffer.
    for (int i = 0; i < 4; i++)
        printf("buf[%d]: %d\n", i, buf[i]);
 
    return 0;
}
#endif
 
#ifdef __cplusplus
} // extern "C"
#endif