ObjFW  Check-in [21c872dbb0]

 */
OF_SUBCLASSING_RESTRICTED
@interface OFGameController: OFObject
{
#ifdef OF_LINUX
	OFString *_path;
	int _fd;
	uint16_t _vendorID, _productID;
	OFString *_name;
	OFMutableSet *_buttons, *_pressedButtons;
	bool _hasLeftAnalogStick, _hasRightAnalogStick;
	OFPoint _leftAnalogStickPosition, _rightAnalogStickPosition;
	int32_t _leftAnalogStickMinX, _leftAnalogStickMaxX;
	int32_t _leftAnalogStickMinY, _leftAnalogStickMaxY;
	int32_t _rightAnalogStickMinX, _rightAnalogStickMaxX;

#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"

static const uint16_t vendorIDNintendo = 0x057E;
static const uint16_t productIDN64Controller = 0x2019;

@interface OFGameController ()
- (instancetype)of_initWithPath: (OFString *)path OF_METHOD_FAMILY(init);
- (void)of_processEvents;
@end

static const uint16_t buttons[] = {
	BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TL2,
	BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_THUMBL, BTN_THUMBR,
	BTN_DPAD_UP, BTN_DPAD_DOWN, BTN_DPAD_LEFT, BTN_DPAD_RIGHT
};

static OFString *
buttonToName(uint16_t button, uint16_t vendorID, uint16_t productID)
{
	if (vendorID == vendorIDNintendo &&
	    productID == productIDN64Controller) {
		switch (button) {
		case BTN_TL2:
			return @"Z";
		case BTN_Y:
			return @"C-Stick Left";
		case BTN_C:
			return @"C-Stick Right";
		case BTN_SELECT:
			return @"C-Stick Up";
		case BTN_X:
			return @"C-Stick Down";
		case BTN_MODE:
			return @"Home";
		case BTN_Z:
			return @"Capture";
		case BTN_THUMBL:
		case BTN_THUMBR:
			return nil;
		}
	}

	switch (button) {
	case BTN_A:
		return @"A";
	case BTN_B:
		return @"B";
	case BTN_C:
		return @"C";

		OFStringEncoding encoding = [OFLocale encoding];
		unsigned long evBits[OFRoundUpToPowerOf2(OF_ULONG_BIT,
		    EV_MAX) / OF_ULONG_BIT] = { 0 };
		unsigned long keyBits[OFRoundUpToPowerOf2(OF_ULONG_BIT,
		    KEY_MAX) / OF_ULONG_BIT] = { 0 };
		unsigned long absBits[OFRoundUpToPowerOf2(OF_ULONG_BIT,
		    ABS_MAX) / OF_ULONG_BIT] = { 0 };
		struct input_id inputID;
		char name[128];

		_path = [path copy];

		if ((_fd = open([_path cStringWithEncoding: encoding],
		    O_RDONLY | O_NONBLOCK)) == -1)
			@throw [OFOpenItemFailedException

		if (ioctl(_fd, EVIOCGBIT(EV_KEY, sizeof(keyBits)), keyBits) ==
		    -1)
			@throw [OFInitializationFailedException exception];

		if (!OFBitSetIsSet(keyBits, BTN_GAMEPAD))
			@throw [OFInvalidArgumentException exception];

		if (ioctl(_fd, EVIOCGID, &inputID) == -1)
			@throw [OFInvalidArgumentException exception];

		_vendorID = inputID.vendor;
		_productID = inputID.product;

		if (ioctl(_fd, EVIOCGNAME(sizeof(name)), name) == -1)
			@throw [OFInitializationFailedException exception];

		_name = [[OFString alloc] initWithCString: name
						 encoding: encoding];

		_buttons = [[OFMutableSet alloc] init];
		for (size_t i = 0; i < sizeof(buttons) / sizeof(*buttons);
		    i++) {
			OFString *buttonName =
			    buttonToName(buttons[i], _vendorID, _productID);

			if (buttonName != nil)
				[_buttons addObject: buttonName];
		}

		_pressedButtons = [[OFMutableSet alloc] init];

		if (OFBitSetIsSet(evBits, EV_ABS)) {
			if (ioctl(_fd, EVIOCGBIT(EV_ABS, sizeof(absBits)),
			    absBits) == -1)
				@throw [OFInitializationFailedException

}

- (void)of_processEvents
{
	struct input_event event;

	for (;;) {
		OFString *name;

		errno = 0;

		if (read(_fd, &event, sizeof(event)) < (int)sizeof(event)) {
			if (errno == EWOULDBLOCK)
				return;

			@throw [OFReadFailedException
			    exceptionWithObject: self
				requestedLength: sizeof(event)
					  errNo: errno];
		}

		switch (event.type) {
		case EV_KEY:
			if ((name = buttonToName(event.code, _vendorID,
			    _productID)) != nil) {
				if (event.value)
					[_pressedButtons addObject: name];

				else
					[_pressedButtons removeObject: name];

			}
			break;
		case EV_ABS:
			switch (event.code) {
			case ABS_X:
				_leftAnalogStickPosition.x = scale(event.value,
				    _leftAnalogStickMinX, _leftAnalogStickMaxX);
				break;