/*

* Support for Windows via the WM_INPUT message.

*

*

* This file written by Ryan C. Gordon.

*/

#include "manymouse.h"

/* WinUser.h won't include rawinput stuff without this... */

#if (_WIN32_WINNT < 0x0501)

#undef _WIN32_WINNT

#define _WIN32_WINNT 0x0501

#endif

#include <malloc.h> /* needed for alloca(). */

/* Cygwin's headers don't have WM_INPUT right now... */

#ifndef WM_INPUT

#define WM_INPUT 0x00FF

#endif

/* that should be enough, knock on wood. */

#define MAX_MICE 32

/*

* Just trying to avoid malloc() here...we statically allocate a buffer

* for events and treat it as a ring buffer.

*/

/* !!! FIXME: tweak this? */

#define MAX_EVENTS 1024

static ManyMouseEvent input_events[MAX_EVENTS];

static volatile int input_events_read = 0;

static volatile int input_events_write = 0;

static int available_mice = 0;

static int did_api_lookup = 0;

static HWND raw_hwnd = NULL;

static const char *class_name = "ManyMouseRawInputCatcher";

static const char *win_name = "ManyMouseRawInputMsgWindow";

static ATOM class_atom = 0;

typedef struct

{

HANDLE handle;

char name[256];

} MouseStruct;

static MouseStruct mice[MAX_MICE];

/*

* The RawInput APIs only exist in Windows XP and later, so you want this

* to fail gracefully on earlier systems instead of refusing to start the

* process due to missing symbols. To this end, we do a symbol lookup on

* User32.dll, etc to get the entry points.

*

* A lot of these are available all the way back to the start of win32 in

* Windows 95 and WinNT 3.1, but just so you don't have to track down any

* import libraries, I've added those here, too. That fits well with the

* idea of just adding the sources to your build and going forward.

static UINT (WINAPI *pGetRawInputDeviceInfoA)(HANDLE,UINT,LPVOID,PUINT);

static BOOL (WINAPI *pRegisterRawInputDevices)(PCRAWINPUTDEVICE,UINT,UINT);

static LRESULT (WINAPI *pDefRawInputProc)(PRAWINPUT *,INT,UINT);

static UINT (WINAPI *pGetRawInputBuffer)(PRAWINPUT,PUINT,UINT);

static UINT (WINAPI *pGetRawInputData)(HRAWINPUT,UINT,LPVOID,PUINT,UINT);

static HWND (WINAPI *pCreateWindowExA)(DWORD,LPCTSTR,LPCTSTR,DWORD,int,int,int,int,HWND,HMENU,HINSTANCE,LPVOID);

static ATOM (WINAPI *pRegisterClassExA)(CONST WNDCLASSEX *);

static LRESULT (WINAPI *pDefWindowProcA)(HWND,UINT,WPARAM,LPARAM);

static BOOL (WINAPI *pUnregisterClassA)(LPCTSTR,HINSTANCE);

static HMODULE (WINAPI *pGetModuleHandleA)(LPCTSTR);

static BOOL (WINAPI *pPeekMessageA)(LPMSG,HWND,UINT,UINT,UINT);

static BOOL (WINAPI *pTranslateMessage)(const MSG *);

static LRESULT (WINAPI *pDispatchMessageA)(const MSG *);

static BOOL (WINAPI *pDestroyWindow)(HWND);

static void (WINAPI *pInitializeCriticalSection)(LPCRITICAL_SECTION);

static void (WINAPI *pEnterCriticalSection)(LPCRITICAL_SECTION);

static void (WINAPI *pLeaveCriticalSection)(LPCRITICAL_SECTION);

static void (WINAPI *pDeleteCriticalSection)(LPCRITICAL_SECTION);

static BOOL (WINAPI *pSetupDiGetDeviceInstanceIdA)(HDEVINFO, PSP_DEVINFO_DATA, PTSTR, DWORD, PDWORD);

static BOOL (WINAPI *pSetupDiGetDeviceRegistryPropertyA)(HDEVINFO, PSP_DEVINFO_DATA, DWORD, PDWORD, PBYTE, DWORD, PDWORD);

static int symlookup(HMODULE dll, void **addr, const char *sym)

{

*addr = GetProcAddress(dll, sym);

if (*addr == NULL)

{

FreeLibrary(dll);

return(0);

} /* if */

return(1);

} /* symlookup */

static int find_api_symbols(void)

{

HMODULE dll;

if (did_api_lookup)

return(1);

dll = LoadLibrary("user32.dll");

if (dll == NULL)

return(0);

LOOKUP(GetRawInputDeviceInfoA);

LOOKUP(RegisterRawInputDevices);

LOOKUP(GetRawInputDeviceList);

LOOKUP(DefRawInputProc);

LOOKUP(GetRawInputBuffer);

LOOKUP(GetRawInputData);

LOOKUP(CreateWindowExA);

LOOKUP(RegisterClassExA);

LOOKUP(UnregisterClassA);

LOOKUP(DefWindowProcA);

LOOKUP(PeekMessageA);

LOOKUP(TranslateMessage);

LOOKUP(DispatchMessageA);

LOOKUP(DestroyWindow);

dll = LoadLibrary("kernel32.dll");

if (dll == NULL)

return(0);

LOOKUP(GetModuleHandleA);

LOOKUP(InitializeCriticalSection);

LOOKUP(EnterCriticalSection);

LOOKUP(LeaveCriticalSection);

LOOKUP(DeleteCriticalSection);

dll = LoadLibrary("setupapi.dll");

if (dll == NULL)

return(0);

LOOKUP(SetupDiGetDeviceInstanceIdA);

LOOKUP(SetupDiGetDeviceRegistryPropertyA);

LOOKUP(SetupDiDestroyDeviceInfoList);

did_api_lookup = 1;

return(1);

} /* find_api_symbols */

/* Some simple functions to avoid C runtime dependency... */

static char make_upper(const char a)

{

return ((a >= 'a') && (a <= 'z')) ? (a - ('a' - 'A')) : a;

} /* make_upper */

static void make_string_upper(char *str)

{

char *ptr;

for (ptr = str; *ptr; ptr++)

*ptr = make_upper(*ptr);

} /* make_string_upper */

static int string_compare(const char *a, const char *b)

{

while (1)

{

const char cha = *(a++);

const char chb = *(b++);

if (cha < chb)

return -1;

else if (cha > chb)

return 1;

else if (cha == '\0')

return 0;

} /* while */

return 0;

} /* string_compare */

static size_t string_length(const char *a)

{

size_t retval;

for (retval = 0; *(a++); retval++) { /* spin. */ }

return retval;

} /* string_length */

static void queue_event(const ManyMouseEvent *event)

{

/* copy the event info. We'll process it in ManyMouse_PollEvent(). */

CopyMemory(&input_events[input_events_write], event, sizeof (ManyMouseEvent));

input_events_write = ((input_events_write + 1) % MAX_EVENTS);

/* Ring buffer full? Lose oldest event. */

if (input_events_write == input_events_read)

{

/* !!! FIXME: we need to not lose mouse buttons here. */

input_events_read = ((input_events_read + 1) % MAX_EVENTS);

} /* if */

} /* queue_event */

static void queue_from_rawinput(const RAWINPUT *raw)

{

int i;

const RAWINPUTHEADER *header = &raw->header;

const RAWMOUSE *mouse = &raw->data.mouse;

ManyMouseEvent event;

if (raw->header.dwType != RIM_TYPEMOUSE)

return;

for (i = 0; i < available_mice; i++) /* find the device for event. */

{

if (mice[i].handle == header->hDevice)

break;

} /* for */

if (i == available_mice)

return; /* not found?! */

/*

* RAWINPUT packs a bunch of events into one, so we split it up into

* a bunch of ManyMouseEvents here and store them in an internal queue.

* Then ManyMouse_PollEvent() just shuffles items off that queue

* without any complicated processing.

*/

event.device = i;

pEnterCriticalSection(&mutex);

if (mouse->usFlags & MOUSE_MOVE_ABSOLUTE)

{

/* !!! FIXME: How do we get the min and max values for absmotion? */

event.type = MANYMOUSE_EVENT_ABSMOTION;

event.item = 0;

event.value = mouse->lLastX;

queue_event(&event);

event.item = 1;

event.value = mouse->lLastY;

queue_event(&event);

} /* if */

else /*if (mouse->usFlags & MOUSE_MOVE_RELATIVE)*/

{

event.type = MANYMOUSE_EVENT_RELMOTION;

if (mouse->lLastX != 0)

{

event.item = 0;

event.value = mouse->lLastX;

queue_event(&event);

} /* if */

if (mouse->lLastY != 0)

{

event.item = 1;

event.value = mouse->lLastY;

queue_event(&event);

} /* if */

} /* else if */

event.type = MANYMOUSE_EVENT_BUTTON;

#define QUEUE_BUTTON(x) { \

if (mouse->usButtonFlags & RI_MOUSE_BUTTON_##x##_DOWN) { \

event.item = x-1; \

event.value = 1; \

queue_event(&event); \

} \

if (mouse->usButtonFlags & RI_MOUSE_BUTTON_##x##_UP) { \

event.item = x-1; \

event.value = 0; \

queue_event(&event); \

} \

}

QUEUE_BUTTON(1);

QUEUE_BUTTON(2);

QUEUE_BUTTON(3);

QUEUE_BUTTON(4);

QUEUE_BUTTON(5);

#undef QUEUE_BUTTON

if (mouse->usButtonFlags & RI_MOUSE_WHEEL)

{

if (mouse->usButtonData != 0) /* !!! FIXME: can this ever be zero? */

{

event.type = MANYMOUSE_EVENT_SCROLL;

queue_event(&event);

} /* if */

} /* if */

pLeaveCriticalSection(&mutex);

} /* queue_from_rawinput */

static void wminput_handler(WPARAM wParam, LPARAM lParam)

{

UINT dwSize = 0;

LPBYTE lpb;

pGetRawInputData((HRAWINPUT) lParam, RID_INPUT, NULL, &dwSize,

sizeof (RAWINPUTHEADER));

if (dwSize < sizeof (RAWINPUT))

return; /* unexpected packet? */

lpb = (LPBYTE) alloca(dwSize);

if (lpb == NULL)

return;

if (pGetRawInputData((HRAWINPUT) lParam, RID_INPUT, lpb, &dwSize,

sizeof (RAWINPUTHEADER)) != dwSize)

return;

queue_from_rawinput((RAWINPUT *) lpb);

} /* wminput_handler */

static LRESULT CALLBACK RawWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)

{

if (Msg == WM_INPUT)

wminput_handler(wParam, lParam);

else if (Msg == WM_DESTROY)

return(0);

static int init_event_queue(void)

{

WNDCLASSEX wce;

RAWINPUTDEVICE rid;

ZeroMemory(input_events, sizeof (input_events));

input_events_read = input_events_write = 0;

ZeroMemory(&wce, sizeof (wce));

wce.cbSize = sizeof(WNDCLASSEX);

wce.lpfnWndProc = RawWndProc;

wce.lpszClassName = class_name;

wce.hInstance = hInstance;

if (class_atom == 0)

return(0);

CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,

CW_USEDEFAULT, HWND_MESSAGE, NULL, hInstance, NULL);

if (raw_hwnd == NULL)

return(0);

pInitializeCriticalSection(&mutex);

ZeroMemory(&rid, sizeof (rid));

rid.usUsagePage = 1; /* GenericDesktop page */

rid.usUsage = 2; /* GeneralDestop Mouse usage. */

rid.dwFlags = RIDEV_INPUTSINK;

rid.hwndTarget = raw_hwnd;

if (!pRegisterRawInputDevices(&rid, 1, sizeof (rid)))

{

pDeleteCriticalSection(&mutex);

return(1);

} /* init_event_queue */

static void cleanup_window(void)

{

if (raw_hwnd)

{

MSG Msg;

pDestroyWindow(raw_hwnd);

while (pPeekMessageA(&Msg, raw_hwnd, 0, 0, PM_REMOVE))

pTranslateMessage(&Msg);

pDispatchMessageA(&Msg);

} /* while */

raw_hwnd = 0;

} /* if */

if (class_atom)

{

class_atom = 0;

} /* if */

} /* cleanup_window */

static int get_devinfo_data(HDEVINFO devinfo, const char *devinstance,

SP_DEVINFO_DATA *data)

{

DWORD i = 0;

const DWORD bufsize = string_length(devinstance) + 1;

char *buf = (char *) alloca(bufsize);

if (buf == NULL)

return 0;

while (1)

{

ZeroMemory(data, sizeof (SP_DEVINFO_DATA));

data->cbSize = sizeof (SP_DEVINFO_DATA);

if (!pSetupDiEnumDeviceInfo(devinfo, i++, data))

{

if (pGetLastError() == ERROR_NO_MORE_ITEMS)

break;

else

continue;

} /* if */

if (!pSetupDiGetDeviceInstanceIdA(devinfo, data, buf, bufsize, NULL))

continue;

make_string_upper(buf);

if (string_compare(devinstance, buf) == 0)

return 1; /* found it! */

} /* while */

return 0; /* not found. */

} /* get_devinfo_data */

static void get_dev_name_by_instance(const char *devinstance, char *name,

size_t namesize)

{

if (devinfo == INVALID_HANDLE_VALUE)

return;

if (get_devinfo_data(devinfo, devinstance, &devdata))

{

pSetupDiGetDeviceRegistryPropertyA(devinfo, &devdata, SPDRP_DEVICEDESC,

NULL, (PBYTE) name, namesize, NULL);

} /* if */

pSetupDiDestroyDeviceInfoList(devinfo);

} /* get_dev_name_by_instance */

{

const char default_device_name[] = "Unidentified input device";

*name = '\0'; /* really insane default. */

if (sizeof (default_device_name) >= namesize)

return;

/* in case we can't stumble upon something better... */

CopyMemory(name, default_device_name, sizeof (default_device_name));

/* okay, we're got the device instance. Now find the data for it. */

get_dev_name_by_instance(devname, name, namesize);

} /* get_device_product_name */

static void init_mouse(const RAWINPUTDEVICELIST *dev)

{

MouseStruct *mouse = &mice[available_mice];

char *buf = NULL;

char *ptr = NULL;

UINT ct = 0;

if (dev->dwType != RIM_TYPEMOUSE)

return; /* keyboard or some other fruity thing. */

if (pGetRawInputDeviceInfoA(dev->hDevice, RIDI_DEVICENAME, NULL, &ct) < 0)

return;

/* ct == is chars, not bytes, but we used the ASCII version. */

buf = (char *) alloca(ct+1);

return;

if (pGetRawInputDeviceInfoA(dev->hDevice, RIDI_DEVICENAME, buf, &ct) < 0)

return;

buf[ct] = '\0'; /* make sure it's null-terminated. */

/* XP starts these strings with "\\??\\" ... Vista does "\\\\?\\". :/ */

while ((*buf == '?') || (*buf == '\\'))

{

buf++;

ct--;

} /* while */

/* This string tap dancing gets us the device instance id. */

char ch = *ptr;

if (ch == '#')

else if (ch == '{') /* hit the GUID part of the string. */

{

if (*(ptr-1) == '\\')

ptr--;

} /* for */

*ptr = '\0';

/*

* Apparently there's a fake "RDP" device...I guess this is

* "Remote Desktop Protocol" for controlling the system pointer

* remotely via Windows Remote Desktop, but that's just a guess.

* At any rate, we don't want that device, so skip it if detected.

*

* Idea for this found here:

* http://link.mywwwserver.com/~jstookey/arcade/rawmouse/raw_mouse.c

*/

/* avoiding memcmp here so we don't get a C runtime dependency... */

if (ct >= sizeof (rdp_ident) - 1)

int i;

for (i = 0; i < sizeof (rdp_ident) - 1; i++)

{

if (buf[i] != rdp_ident[i])

break;

} /* for */

if (i == sizeof (rdp_ident) - 1)

return; /* this is an RDP thing. Skip this device. */

/* accept this mouse! */

ZeroMemory(mouse, sizeof (MouseStruct));

get_device_product_name(mouse->name, sizeof (mouse->name), buf);

mouse->handle = dev->hDevice;

available_mice++;

} /* init_mouse */

static int windows_wminput_init(void)

{

RAWINPUTDEVICELIST *devlist = NULL;

UINT ct = 0;

UINT i;

available_mice = 0;

if (!find_api_symbols()) /* only supported on WinXP and later. */

return(0);

pGetRawInputDeviceList(NULL, &ct, sizeof (RAWINPUTDEVICELIST));

if (ct == 0) /* no devices. */

return(0);

devlist = (PRAWINPUTDEVICELIST) alloca(sizeof (RAWINPUTDEVICELIST) * ct);

pGetRawInputDeviceList(devlist, &ct, sizeof (RAWINPUTDEVICELIST));

for (i = 0; i < ct; i++)

init_mouse(&devlist[i]);

if (!init_event_queue())

{

cleanup_window();

available_mice = 0;

} /* if */

return(available_mice);

} /* windows_wminput_init */

static void windows_wminput_quit(void)

{

/* unregister WM_INPUT devices... */

RAWINPUTDEVICE rid;

ZeroMemory(&rid, sizeof (rid));

rid.usUsagePage = 1; /* GenericDesktop page */

rid.usUsage = 2; /* GeneralDestop Mouse usage. */

rid.dwFlags |= RIDEV_REMOVE;

pRegisterRawInputDevices(&rid, 1, sizeof (rid));

cleanup_window();

available_mice = 0;

} /* windows_wminput_quit */

static const char *windows_wminput_name(unsigned int index)

{

if (index < available_mice)

return(NULL);

} /* windows_wminput_name */

/*

* Windows doesn't send a WM_INPUT event when you unplug a mouse,

* so we try to do a basic query by device handle here; if the

* query fails, we assume the device has vanished and generate a

* disconnect.

*/

static int check_for_disconnects(ManyMouseEvent *ev)

{

/*

* (i) is static so we iterate through all mice round-robin and check

* one mouse per call to ManyMouse_PollEvent(). This makes this test O(1).

*/

static unsigned int i = 0;

MouseStruct *mouse = NULL;

if (++i >= available_mice) /* check first in case of redetect */

i = 0;

mouse = &mice[i];

if (mouse->handle != NULL) /* not NULL == still plugged in. */

{

UINT size = 0;

UINT rc = pGetRawInputDeviceInfoA(mouse->handle, RIDI_DEVICEINFO,

NULL, &size);

if (rc == (UINT) -1) /* failed...probably unplugged... */

{

mouse->handle = NULL;

ev->type = MANYMOUSE_EVENT_DISCONNECT;

ev->device = i;

return(1);

} /* if */

} /* if */

return(0); /* no disconnect event this time. */

} /* check_for_disconnects */

{

MSG Msg; /* run the queue for WM_INPUT messages, etc ... */

/* ...favor existing events in the queue... */

if (input_events_read != input_events_write) /* no events if equal. */

{

/* pump Windows for new hardware events... */

while (pPeekMessageA(&Msg, raw_hwnd, 0, 0, PM_REMOVE))

{

pTranslateMessage(&Msg);

pDispatchMessageA(&Msg);

} /* while */

/* In case something new came in, give it to the app... */

pEnterCriticalSection(&mutex);

if (input_events_read != input_events_write) /* no events if equal. */

{

CopyMemory(ev, &input_events[input_events_read], sizeof (*ev));

input_events_read = ((input_events_read + 1) % MAX_EVENTS);

found = 1;

} /* if */

pLeaveCriticalSection(&mutex);

} /* if */

/*

* Check for disconnects if queue is totally empty and Windows didn't

* report anything new at this time. This ensures that we don't send a

* disconnect event through ManyMouse and then later give a valid

* event to the app for a device that is now missing.

*/

if (!found)

found = check_for_disconnects(ev);

} /* windows_wminput_poll */

{

windows_wminput_init,

windows_wminput_quit,

windows_wminput_name,

windows_wminput_poll

};

const ManyMouseDriver *ManyMouseDriver_windows = &ManyMouseDriver_interface;

#else

const ManyMouseDriver *ManyMouseDriver_windows = 0;

#endif /* ifdef Windows blocker */