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Refactor joystick GUID creation

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This commit is contained in:
Sam Lantinga 2022-08-22 19:28:21 -07:00
parent aae566e196
commit 277b033e78
19 changed files with 78 additions and 221 deletions
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40
src/joystick/SDL_joystick.c
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@ -1973,6 +1973,46 @@ SDL_CreateJoystickName(Uint16 vendor, Uint16 product, const char *vendor_name, c
return name;
}
SDL_JoystickGUID
SDL_CreateJoystickGUID(Uint16 bus, Uint16 vendor, Uint16 product, Uint16 version, const char *name, Uint8 driver_signature, Uint8 driver_data)
{
SDL_JoystickGUID guid;
Uint16 *guid16 = (Uint16 *)guid.data;
SDL_zero(guid);
/* We only need 16 bits for each of these; space them out to fill 128. */
/* Byteswap so devices get same GUID on little/big endian platforms. */
*guid16++ = SDL_SwapLE16(bus);
*guid16++ = SDL_SwapLE16(SDL_crc16(0, name, SDL_strlen(name)));
if (vendor && product) {
*guid16++ = SDL_SwapLE16(vendor);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(product);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(version);
guid.data[14] = driver_signature;
guid.data[15] = driver_data;
} else {
size_t available_space = sizeof(guid.data) - 4;
if (driver_signature) {
available_space -= 2;
guid.data[14] = driver_signature;
guid.data[15] = driver_data;
}
SDL_strlcpy((char*)guid16, name, available_space);
}
return guid;
}
SDL_JoystickGUID
SDL_CreateJoystickGUIDForName(const char *name)
{
return SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_UNKNOWN, 0, 0, 0, name, 0, 0);
}
SDL_GameControllerType
SDL_GetJoystickGameControllerTypeFromVIDPID(Uint16 vendor, Uint16 product, const char *name, SDL_bool forUI)
{