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Added the CRC of the joystick name to the GUID

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This will make it possible to have mappings for different controllers
that have the same VID/PID. This happens frequently with some generic
controller boards that have been reused in many products.

Fixes https://github.com/libsdl-org/SDL/issues/6004
This commit is contained in:
Sam Lantinga
2022-08-22 16:46:55 -07:00
parent 20715fa014
commit c1e0873940
21 changed files with 179 additions and 117 deletions
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10
src/joystick/android/SDL_sysjoystick.c
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@@ -360,7 +360,7 @@ Android_AddJoystick(int device_id, const char *name, const char *desc, int vendo
/* 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(SDL_HARDWARE_BUS_BLUETOOTH);
*guid16++ = 0;
*guid16++ = SDL_SwapLE16(SDL_crc16(0, desc, SDL_strlen(desc)));
if (vendor_id && product_id) {
*guid16++ = SDL_SwapLE16(vendor_id);
@@ -368,12 +368,8 @@ Android_AddJoystick(int device_id, const char *name, const char *desc, int vendo
*guid16++ = SDL_SwapLE16(product_id);
*guid16++ = 0;
} else {
Uint32 crc = 0;
SDL_crc32(crc, desc, SDL_strlen(desc));
SDL_memcpy(guid16, desc, SDL_min(2*sizeof(*guid16), SDL_strlen(desc)));
guid16 += 2;
*(Uint32 *)guid16 = SDL_SwapLE32(crc);
guid16 += 2;
SDL_strlcpy((char*)guid16, name, 4*sizeof(Uint16));
guid16 += 4;
}
*guid16++ = SDL_SwapLE16(button_mask);