Add checksums (used as a timestamp) to VFS.

Deprecate mj_makeEmptyFileVFS in favor of mj_addBufferVFS.

PiperOrigin-RevId: 608915388
Change-Id: Id9e9b042799bc1bf547f0795ae6f386447d53cdd

doc/APIreference/functions.rst

@@ -1109,14 +1109,14 @@ mj_addFileVFS
 Add file to VFS. The directory argument is optional and can be NULL or empty. Returns 0 on success, 1 when VFS is full,
 2 on name collision, or -1 when an internal error occurs.
 
-.. _mj_makeEmptyFileVFS:
+.. _mj_addBufferVFS:
 
-mj_makeEmptyFileVFS
-~~~~~~~~~~~~~~~~~~~
+mj_addBufferVFS
+~~~~~~~~~~~~~~~
 
-.. mujoco-include:: mj_makeEmptyFileVFS
+.. mujoco-include:: mj_addBufferVFS
 
-Make empty file in VFS, return 0: success, 1: full, 2: repeated name.
+Add file to VFS from buffer, return 0: success, 1: full, 2: repeated name, -1: failed to load.
 
 .. _mj_findFileVFS:
 
@@ -1145,6 +1145,15 @@ mj_deleteVFS
 
 Delete all files from VFS.
 
+.. _mj_makeEmptyFileVFS:
+
+mj_makeEmptyFileVFS
+~~~~~~~~~~~~~~~~~~~
+
+.. mujoco-include:: mj_makeEmptyFileVFS
+
+deprecated: use mj_copyBufferVFS.
+
 .. _Initialization:
 
 Initialization