Re-added the CRC to the joystick guid

This is now used as a crc field in the mapping rather than directly in mapping guids, for better mapping compatibility between versions of SDL.

Added SDL_GetJoystickGUIDInfo() to get device information encoded in a joystick GUID, so that mapping programs can clear the CRC from the GUID when generating mappings.

sort_controllers.py has been updated to extract the CRC from mappings created by older mapping programs and convert it into the new crc field. It will also take the CRC into account when checking for duplicate mappings.

Also regenerated the GUIDs for the PS2/PSP/Vita controller mappings, fixing https://github.com/libsdl-org/SDL/issues/6151

WhatsNew.txt

@@ -1,6 +1,14 @@
 
 This is a list of major changes in SDL's version history.
 
+---------------------------------------------------------------------------
+2.26.0:
+---------------------------------------------------------------------------
+
+General:
+* Added SDL_GetJoystickGUIDInfo() to get device information encoded in a joystick GUID
+
+
 ---------------------------------------------------------------------------
 2.24.0:
 ---------------------------------------------------------------------------

include/SDL_joystick.h

@@ -647,6 +647,21 @@ extern DECLSPEC void SDLCALL SDL_JoystickGetGUIDString(SDL_JoystickGUID guid, ch
  */
 extern DECLSPEC SDL_JoystickGUID SDLCALL SDL_JoystickGetGUIDFromString(const char *pchGUID);
 
+/**
+ * Get the device information encoded in a SDL_JoystickGUID structure
+ *
+ * \param guid the SDL_JoystickGUID you wish to get info about
+ * \param vendor A pointer filled in with the device VID, or 0 if not available
+ * \param product A pointer filled in with the device PID, or 0 if not available
+ * \param version A pointer filled in with the device version, or 0 if not available
+ * \param crc A pointer filled in with a CRC used to distinguish different products with the same VID/PID, or 0 if not available
+ *
+ * \since This function is available since SDL 2.26.0.
+ *
+ * \sa SDL_JoystickGetDeviceGUID
+ */
+extern DECLSPEC void SDLCALL SDL_GetJoystickGUIDInfo(SDL_JoystickGUID guid, Uint16 *vendor, Uint16 *product, Uint16 *version, Uint16 *crc16);
+
 /**
  * Get the status of a specified joystick.
  *

src/dynapi/SDL2.exports

@@ -859,3 +859,4 @@
 ++'_SDL_ResetHint'.'SDL2.dll'.'SDL_ResetHint'
 ++'_SDL_crc16'.'SDL2.dll'.'SDL_crc16'
 ++'_SDL_GetWindowSizeInPixels'.'SDL2.dll'.'SDL_GetWindowSizeInPixels'
+++'_SDL_GetJoystickGUIDInfo'.'SDL2.dll'.'SDL_GetJoystickGUIDInfo'

src/dynapi/SDL_dynapi_overrides.h

@@ -885,3 +885,4 @@
 #define SDL_ResetHint SDL_ResetHint_REAL
 #define SDL_crc16 SDL_crc16_REAL
 #define SDL_GetWindowSizeInPixels SDL_GetWindowSizeInPixels_REAL
+#define SDL_GetJoystickGUIDInfo SDL_GetJoystickGUIDInfo_REAL

src/dynapi/SDL_dynapi_procs.h

@@ -968,3 +968,4 @@ SDL_DYNAPI_PROC(int,SDL_GetRectDisplayIndex,(const SDL_Rect *a),(a),return)
 SDL_DYNAPI_PROC(SDL_bool,SDL_ResetHint,(const char *a),(a),return)
 SDL_DYNAPI_PROC(Uint16,SDL_crc16,(Uint16 a, const void *b, size_t c),(a,b,c),return)
 SDL_DYNAPI_PROC(void,SDL_GetWindowSizeInPixels,(SDL_Window *a, int *b, int *c),(a,b,c),)
+SDL_DYNAPI_PROC(void,SDL_GetJoystickGUIDInfo,(SDL_JoystickGUID a, Uint16 *b, Uint16 *c, Uint16 *d, Uint16 *e),(a,b,c,d,e),)

src/joystick/SDL_gamecontroller.c

@@ -664,21 +664,23 @@ static ControllerMapping_t *SDL_CreateMappingForWGIController(SDL_JoystickGUID g
 static ControllerMapping_t *SDL_PrivateGetControllerMappingForGUID(SDL_JoystickGUID guid, SDL_bool exact_match)
 {
     ControllerMapping_t *mapping;
-    SDL_JoystickGUID zero_crc_guid;
+    Uint16 crc;
 
-    /* First check for exact match */
+    SDL_GetJoystickGUIDInfo(guid, NULL, NULL, NULL, &crc);
+    if (crc) {
+        /* Clear the CRC from the GUID for matching */
+        SDL_SetJoystickGUIDCRC(&guid, 0);
+    }
     for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
         if (SDL_memcmp(&guid, &mapping->guid, sizeof(guid)) == 0) {
-            return mapping;
+            /* Check to see if the CRC matches */
+            const char *crc_string = SDL_strstr(mapping->mapping, "crc:");
+            if (crc_string) {
+                Uint16 mapping_crc = (Uint16)SDL_strtol(crc_string + 4, NULL, 16); 
+                if (crc != mapping_crc) {
+                    continue;
                 }
             }
-
-    /* Now check for match with no CRC */
-    SDL_memcpy(&zero_crc_guid, &guid, sizeof(guid));
-    zero_crc_guid.data[2] = 0;
-    zero_crc_guid.data[3] = 0;
-    for (mapping = s_pSupportedControllers; mapping; mapping = mapping->next) {
-        if (SDL_memcmp(&zero_crc_guid, &mapping->guid, sizeof(guid)) == 0) {
             return mapping;
         }
     }
@@ -1098,6 +1100,7 @@ SDL_PrivateAddMappingForGUID(SDL_JoystickGUID jGUID, const char *mappingString,
     char *pchName;
     char *pchMapping;
     ControllerMapping_t *pControllerMapping;
+    Uint16 crc;
 
     pchName = SDL_PrivateGetControllerNameFromMappingString(mappingString);
     if (!pchName) {
@@ -1112,6 +1115,38 @@ SDL_PrivateAddMappingForGUID(SDL_JoystickGUID jGUID, const char *mappingString,
         return NULL;
     }
 
+    /* Fix up the GUID and the mapping with the CRC, if needed */
+    SDL_GetJoystickGUIDInfo(jGUID, NULL, NULL, NULL, &crc);
+    if (crc) {
+        /* Make sure the mapping has the CRC */
+        char *new_mapping;
+        char *crc_end = "";
+        char *crc_string = SDL_strstr(pchMapping, "crc:");
+        if (crc_string) {
+            crc_end = SDL_strchr(crc_string, ',');
+            if (crc_end) {
+                ++crc_end;
+            } else {
+                crc_end = "";
+            }
+            *crc_string = '\0';
+        }
+
+        if (SDL_asprintf(&new_mapping, "%scrc:%.4x,%s", pchMapping, crc, crc_end) >= 0) {
+            SDL_free(pchMapping);
+            pchMapping = new_mapping;
+        }
+    } else {
+        /* Make sure the GUID has the CRC, for matching purposes */
+        char *crc_string = SDL_strstr(pchMapping, "crc:");
+        if (crc_string) {
+            crc = (Uint16)SDL_strtol(crc_string + 4, NULL, 16);
+            if (crc) {
+                SDL_SetJoystickGUIDCRC(&jGUID, crc);
+            }
+        }
+    }
+
     pControllerMapping = SDL_PrivateGetControllerMappingForGUID(jGUID, SDL_TRUE);
     if (pControllerMapping) {
         /* Only overwrite the mapping if the priority is the same or higher. */
@@ -1137,6 +1172,10 @@ SDL_PrivateAddMappingForGUID(SDL_JoystickGUID jGUID, const char *mappingString,
             SDL_OutOfMemory();
             return NULL;
         }
+        /* Clear the CRC, we've already added it to the mapping */
+        if (crc) {
+            SDL_SetJoystickGUIDCRC(&jGUID, 0);
+        }
         pControllerMapping->guid = jGUID;
         pControllerMapping->name = pchName;
         pControllerMapping->mapping = pchMapping;

src/joystick/SDL_gamecontrollerdb.h

@@ -132,7 +132,6 @@ static const char *s_ControllerMappings [] =
     "03000000b80500000610000000000000,Elecom Gamepad,a:b2,b:b3,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b0,y:b1,",
     "03000000852100000201000000000000,FF-GP1,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b0,y:b3,",
     "030000000d0f00002700000000000000,FIGHTING STICK V3,a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,lefttrigger:b6,rightshoulder:b5,righttrigger:b7,start:b9,x:b0,y:b3,",
-    "78696e70757403000000000000000000,Fightstick TES,a:b0,b:b1,back:b6,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b10,leftshoulder:b4,lefttrigger:a2,rightshoulder:b5,righttrigger:a5,start:b7,x:b2,y:b3,",
     "03000000151900004000000000000000,Flydigi Vader 2,a:b11,b:b10,back:b3,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b7,leftstick:b1,lefttrigger:b5,leftx:a0,lefty:a1,rightshoulder:b6,rightstick:b0,righttrigger:b4,rightx:a3,righty:a4,start:b2,x:b9,y:b8,",
     "03000000b40400001124000000000000,Flydigi Vader 2,a:b0,b:b1,back:b10,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b6,leftstick:b12,lefttrigger:b8,leftx:a0,lefty:a1,paddle1:b4,paddle2:b5,paddle4:b17,rightshoulder:b7,rightstick:b13,righttrigger:b9,rightx:a3,righty:a4,start:b11,x:b2,y:b3,",
     "03000000790000000600000000000000,G-Shark GS-GP702,a:b2,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b3,y:b0,",
@@ -213,7 +212,6 @@ static const char *s_ControllerMappings [] =
     "030000002a0600001024000000000000,Matricom,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b12,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a3,righty:a4,start:b9,x:b2,y:b3,",
     "03000000250900000128000000000000,Mayflash Arcade Stick,a:b1,b:b2,back:b8,leftshoulder:b0,lefttrigger:b4,leftx:a0,lefty:a1,rightshoulder:b3,righttrigger:b7,start:b9,x:b5,y:b6,",
     "03000000790000004418000000000000,Mayflash GameCube Controller,a:b1,b:b2,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,lefttrigger:a3,leftx:a0,lefty:a1,rightshoulder:b7,righttrigger:a4,rightx:a5,righty:a2,start:b9,x:b0,y:b3,",
-    "030000008f0e00001330000000000000,Mayflash N64 controller adapter PC043,a:b1,b:b2,start:b9,leftshoulder:b6,rightshoulder:b7,guide:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftx:a0,lefty:a1,rightx:a2,righty:a3,",
     "030000008f0e00001030000000000000,Mayflash USB Adapter for original Sega Saturn controller,a:b0,b:b1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b6,lefttrigger:b5,rightshoulder:b2,righttrigger:b7,start:b9,x:b3,y:b4,",
     "0300000025090000e803000000000000,Mayflash Wii Classic Controller,a:b1,b:b0,back:b8,dpdown:b13,dpleft:b12,dpright:b14,dpup:b11,guide:b10,leftshoulder:b4,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b3,y:b2,",
     "03000000790000000018000000000000,Mayflash WiiU Pro Game Controller Adapter (DInput),a:b1,b:b2,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b0,y:b3,",
@@ -510,7 +508,7 @@ static const char *s_ControllerMappings [] =
     "03000000830500006020000000010000,iBuffalo SNES Controller,a:b1,b:b0,back:b6,dpdown:+a1,dpleft:-a0,dpright:+a0,dpup:-a1,leftshoulder:b4,rightshoulder:b5,start:b7,x:b3,y:b2,hint:!SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
     "03000000830500006020000000000000,iBuffalo USB 2-axis 8-button Gamepad,a:b1,b:b0,back:b6,leftshoulder:b4,leftx:a0,lefty:a1,rightshoulder:b5,start:b7,x:b3,y:b2,",
 #endif
-#ifdef SDL_JOYSTICK_LINUX
+#if SDL_JOYSTICK_LINUX
     "xinput,*,a:b0,b:b1,back:b6,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b8,leftshoulder:b4,leftstick:b9,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b10,righttrigger:a5,rightx:a3,righty:a4,start:b7,x:b2,y:b3,",
     "03000000c82d00000090000011010000,8BitDo FC30 Pro,a:b0,b:b1,back:b10,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b6,leftstick:b13,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b14,righttrigger:a5,rightx:a2,righty:a3,start:b11,x:b3,y:b4,hint:SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
     "03000000c82d00000090000011010000,8BitDo FC30 Pro,a:b1,b:b0,back:b10,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b6,leftstick:b13,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b7,rightstick:b14,righttrigger:a5,rightx:a2,righty:a3,start:b11,x:b4,y:b3,hint:!SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
@@ -919,7 +917,7 @@ static const char *s_ControllerMappings [] =
     "0500000083050000602000000ffe0000,iBuffalo SNES Controller,a:b0,b:b1,back:b9,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,leftshoulder:b15,rightshoulder:b16,start:b10,x:b2,y:b3,hint:SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
     "0500000083050000602000000ffe0000,iBuffalo SNES Controller,a:b1,b:b0,back:b9,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,leftshoulder:b15,rightshoulder:b16,start:b10,x:b3,y:b2,hint:!SDL_GAMECONTROLLER_USE_BUTTON_LABELS:=1,",
 #endif
-#if defined(SDL_JOYSTICK_MFI)
+#if SDL_JOYSTICK_MFI
     "05000000ac050000010000004f066d01,*,a:b0,b:b1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b6,leftshoulder:b4,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,righttrigger:a5,rightx:a3,righty:a4,x:b2,y:b3,",
     "05000000ac05000001000000cf076d01,*,a:b0,b:b1,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b8,leftshoulder:b4,leftstick:b6,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b7,righttrigger:a5,rightx:a3,righty:a4,x:b2,y:b3,",
     "05000000ac05000001000000df076d01,*,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b6,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b7,righttrigger:a5,rightx:a3,righty:a4,start:b9,x:b2,y:b3,",
@@ -947,17 +945,17 @@ static const char *s_ControllerMappings [] =
     "050000005e040000e0020000df070000,Xbox Wireless Controller,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,leftshoulder:b4,leftstick:b6,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b7,righttrigger:a5,rightx:a3,righty:a4,start:b9,x:b2,y:b3,",
     "050000005e040000e0020000ff070000,Xbox Wireless Controller,a:b0,b:b1,back:b8,dpdown:h0.4,dpleft:h0.8,dpright:h0.2,dpup:h0.1,guide:b9,leftshoulder:b4,leftstick:b6,lefttrigger:a2,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b7,righttrigger:a5,rightx:a3,righty:a4,start:b10,x:b2,y:b3,",
 #endif
-#if defined(SDL_JOYSTICK_EMSCRIPTEN)
+#if SDL_JOYSTICK_EMSCRIPTEN
     "default,Standard Gamepad,a:b0,b:b1,back:b8,dpdown:b13,dpleft:b14,dpright:b15,dpup:b12,guide:b16,leftshoulder:b4,leftstick:b10,lefttrigger:b6,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b11,righttrigger:b7,rightx:a2,righty:a3,start:b9,x:b2,y:b3,",
 #endif
-#if defined(SDL_JOYSTICK_VITA)
+#if SDL_JOYSTICK_PS2
-    "50535669746120436f6e74726f6c6c65,PSVita Controller,a:b2,b:b1,back:b10,dpdown:b6,dpleft:b7,dpright:b9,dpup:b8,leftshoulder:b4,leftstick:b14,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b15,righttrigger:a5,rightx:a2,righty:a3,start:b11,x:b3,y:b0,",
+    "0000000050533220436f6e74726f6c00,PS2 Controller,crc:87ed,a:b14,b:b13,back:b0,dpdown:b6,dpleft:b7,dpright:b5,dpup:b4,leftshoulder:b10,leftstick:b1,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b11,rightstick:b2,righttrigger:b9,rightx:a2,righty:a3,start:b3,x:b15,y:b12,",
 #endif
-#if defined(SDL_JOYSTICK_PSP)
+#if SDL_JOYSTICK_PSP
-    "505350206275696c74696e206a6f7970,PSP builtin joypad,a:b2,b:b1,back:b10,dpdown:b6,dpleft:b7,dpright:b9,dpup:b8,leftshoulder:b4,leftx:a0,lefty:a1,rightshoulder:b5,rightx:a2,righty:a3,start:b11,x:b3,y:b0,",
+    "00000000505350206275696c74696e00,PSP builtin joypad,crc:86bb,a:b2,b:b1,back:b10,dpdown:b6,dpleft:b7,dpright:b9,dpup:b8,leftshoulder:b4,leftx:a0,lefty:a1,rightshoulder:b5,rightx:a2,righty:a3,start:b11,x:b3,y:b0,",
 #endif
-#if defined(SDL_JOYSTICK_PS2)
+#if SDL_JOYSTICK_VITA
-    "50533220436f6e74726f6c6c65720000,PS2 Controller,a:b14,b:b13,back:b0,dpdown:b6,dpleft:b7,dpright:b5,dpup:b4,leftshoulder:b10,leftstick:b1,lefttrigger:b8,leftx:a0,lefty:a1,rightshoulder:b11,rightstick:b2,righttrigger:b9,rightx:a2,righty:a3,start:b3,x:b15,y:b12,",
+    "0000000050535669746120436f6e7400,PSVita Controller,crc:98d5,a:b2,b:b1,back:b10,dpdown:b6,dpleft:b7,dpright:b9,dpup:b8,leftshoulder:b4,leftstick:b14,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b5,rightstick:b15,righttrigger:a5,rightx:a2,righty:a3,start:b11,x:b3,y:b0,",
 #endif
     "hidapi,*,a:b0,b:b1,back:b4,dpdown:b12,dpleft:b13,dpright:b14,dpup:b11,guide:b5,leftshoulder:b9,leftstick:b7,lefttrigger:a4,leftx:a0,lefty:a1,rightshoulder:b10,rightstick:b8,righttrigger:a5,rightx:a2,righty:a3,start:b6,x:b2,y:b3,",
     NULL

src/joystick/SDL_joystick.c

@@ -1984,11 +1984,7 @@ SDL_CreateJoystickGUID(Uint16 bus, Uint16 vendor, Uint16 product, Uint16 version
     /* 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);
-#if 1
-    *guid16++ = 0;
-#else
     *guid16++ = SDL_SwapLE16(SDL_crc16(0, name, SDL_strlen(name)));
-#endif
 
     if (vendor && product) {
         *guid16++ = SDL_SwapLE16(vendor);
@@ -2017,6 +2013,14 @@ SDL_CreateJoystickGUIDForName(const char *name)
     return SDL_CreateJoystickGUID(SDL_HARDWARE_BUS_UNKNOWN, 0, 0, 0, name, 0, 0);
 }
 
+void
+SDL_SetJoystickGUIDCRC(SDL_JoystickGUID *guid, Uint16 crc)
+{
+    Uint16 *guid16 = (Uint16 *)guid->data;
+
+    guid16[1] = SDL_SwapLE16(crc);
+}
+
 SDL_GameControllerType
 SDL_GetJoystickGameControllerTypeFromVIDPID(Uint16 vendor, Uint16 product, const char *name, SDL_bool forUI)
 {

src/joystick/SDL_joystick_c.h

@@ -54,9 +54,6 @@ extern SDL_bool SDL_GetDriverAndJoystickIndex(int device_index, struct _SDL_Joys
 /* Function to return the device index for a joystick ID, or -1 if not found */
 extern int SDL_JoystickGetDeviceIndexFromInstanceID(SDL_JoystickID instance_id);
 
-/* Function to extract information from an SDL joystick GUID */
-extern void SDL_GetJoystickGUIDInfo(SDL_JoystickGUID guid, Uint16 *vendor, Uint16 *product, Uint16 *version, Uint16 *crc16);
-
 /* Function to standardize the name for a controller
    This should be freed with SDL_free() when no longer needed
  */
@@ -68,6 +65,9 @@ extern SDL_JoystickGUID SDL_CreateJoystickGUID(Uint16 bus, Uint16 vendor, Uint16
 /* Function to create a GUID for a joystick based on the name, with no VID/PID information */
 extern SDL_JoystickGUID SDL_CreateJoystickGUIDForName(const char *name);
 
+/* Function to set the CRC field of a joystick GUID */
+extern void SDL_SetJoystickGUIDCRC(SDL_JoystickGUID *guid, Uint16 crc);
+
 /* Function to return the type of a controller */
 extern SDL_GameControllerType SDL_GetJoystickGameControllerTypeFromVIDPID(Uint16 vendor, Uint16 product, const char *name, SDL_bool forUI);
 extern SDL_GameControllerType SDL_GetJoystickGameControllerTypeFromGUID(SDL_JoystickGUID guid, const char *name);

src/joystick/sort_controllers.py

@@ -13,6 +13,7 @@ controllers = []
 controller_guids = {}
 conditionals = []
 split_pattern = re.compile(r'([^"]*")([^,]*,)([^,]*,)([^"]*)(".*)')
+guid_crc_pattern = re.compile(r'^([0-9a-zA-Z]{4})([0-9a-zA-Z]{4})([0-9a-zA-Z]{24},)$')
 
 def find_element(prefix, bindings):
     i=0
@@ -31,6 +32,19 @@ def save_controller(line):
     if (bindings[0] == ""):
         bindings.pop(0)
 
+    crc = ""
+    pos = find_element("crc:", bindings)
+    if pos >= 0:
+        crc = bindings[pos] + ","
+        bindings.pop(pos)
+
+    # Look for CRC embedded in the GUID and convert to crc element
+    crc_match = guid_crc_pattern.match(entry[1])
+    if crc_match and crc_match.group(2) != '0000':
+        print("Extracting CRC from GUID of " + entry[2])
+        entry[1] = crc_match.group(1) + '0000' + crc_match.group(3)
+        crc = "crc:" + crc_match.group(2) + ","
+
     pos = find_element("sdk", bindings)
     if pos >= 0:
         bindings.append(bindings.pop(pos))
@@ -39,30 +53,33 @@ def save_controller(line):
     if pos >= 0:
         bindings.append(bindings.pop(pos))
 
+    entry.extend(crc)
     entry.extend(",".join(bindings) + ",")
     entry.append(match.group(5))
     controllers.append(entry)
 
+    entry_id = entry[1] + entry[3]
     if ',sdk' in line or ',hint:' in line:
-        conditionals.append(entry[1])
+        conditionals.append(entry_id)
 
 def write_controllers():
     global controllers
     global controller_guids
     # Check for duplicates
     for entry in controllers:
-        if (entry[1] in controller_guids and entry[1] not in conditionals):
+        entry_id = entry[1] + entry[3]
+        if (entry_id in controller_guids and entry_id not in conditionals):
             current_name = entry[2]
-            existing_name = controller_guids[entry[1]][2]
+            existing_name = controller_guids[entry_id][2]
             print("Warning: entry '%s' is duplicate of entry '%s'" % (current_name, existing_name))
 
             if (not current_name.startswith("(DUPE)")):
                 entry[2] = f"(DUPE) {current_name}"
 
             if (not existing_name.startswith("(DUPE)")):
-                controller_guids[entry[1]][2] = f"(DUPE) {existing_name}"
+                controller_guids[entry_id][2] = f"(DUPE) {existing_name}"
 
-        controller_guids[entry[1]] = entry
+        controller_guids[entry_id] = entry
 
     for entry in sorted(controllers, key=lambda entry: f"{entry[2]}-{entry[1]}"):
         line = "".join(entry) + "\n"

test/controllermap.c

@@ -558,6 +558,8 @@ WatchJoystick(SDL_Joystick * joystick)
     }
 
     if (s_bBindingComplete) {
+        SDL_JoystickGUID guid;
+        Uint16 crc;
         char mapping[1024];
         char trimmed_name[128];
         char *spot;
@@ -576,13 +578,28 @@ WatchJoystick(SDL_Joystick * joystick)
         }
 
         /* Initialize mapping with GUID and name */
-        SDL_JoystickGetGUIDString(SDL_JoystickGetGUID(joystick), mapping, SDL_arraysize(mapping));
+        guid = SDL_JoystickGetGUID(joystick);
+        SDL_GetJoystickGUIDInfo(guid, NULL, NULL, NULL, &crc);
+        if (crc) {
+            /* Clear the CRC from the GUID for the mapping */
+            guid.data[2] = 0;
+            guid.data[3] = 0;
+        }
+        SDL_JoystickGetGUIDString(guid, mapping, SDL_arraysize(mapping));
         SDL_strlcat(mapping, ",", SDL_arraysize(mapping));
         SDL_strlcat(mapping, trimmed_name, SDL_arraysize(mapping));
         SDL_strlcat(mapping, ",", SDL_arraysize(mapping));
         SDL_strlcat(mapping, "platform:", SDL_arraysize(mapping));
         SDL_strlcat(mapping, SDL_GetPlatform(), SDL_arraysize(mapping));
         SDL_strlcat(mapping, ",", SDL_arraysize(mapping));
+        if (crc) {
+            char crc_string[5];
+
+            SDL_strlcat(mapping, "crc:", SDL_arraysize(mapping));
+            SDL_snprintf(crc_string, sizeof(crc_string), "%.4x", crc);
+            SDL_strlcat(mapping, crc_string, SDL_arraysize(mapping));
+            SDL_strlcat(mapping, ",", SDL_arraysize(mapping));
+        }
 
         for (iIndex = 0; iIndex < SDL_arraysize(s_arrBindings); ++iIndex) {
             SDL_GameControllerExtendedBind *pBinding = &s_arrBindings[iIndex];