Initial open sourcing of MuJoCo.

PiperOrigin-RevId: 450374687
Change-Id: Ie3225a46ce095fc28ae8e63c326a640261f562bb

src/engine/engine_vfs.h

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+// Copyright 2021 DeepMind Technologies Limited
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef MUJOCO_SRC_ENGINE_ENGINE_VFS_H_
+#define MUJOCO_SRC_ENGINE_ENGINE_VFS_H_
+
+#include <mujoco/mjexport.h>
+#include <mujoco/mjmodel.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// initialize to empty (no deallocation)
+MJAPI void mj_defaultVFS(mjVFS* vfs);
+
+// add file to VFS, return 0: success, 1: full, 2: repeated name, -1: not found on disk
+MJAPI int mj_addFileVFS(mjVFS* vfs, const char* directory, const char* filename);
+
+// make empty file in VFS, return 0: success, 1: full, 2: repeated name
+MJAPI int mj_makeEmptyFileVFS(mjVFS* vfs, const char* filename, int filesize);
+
+// return file index in VFS, or -1 if not found in VFS
+MJAPI int mj_findFileVFS(const mjVFS* vfs, const char* filename);
+
+// delete file from VFS, return 0: success, -1: not found in VFS
+MJAPI int mj_deleteFileVFS(mjVFS* vfs, const char* filename);
+
+// delete all files from VFS
+MJAPI void mj_deleteVFS(mjVFS* vfs);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // MUJOCO_SRC_ENGINE_ENGINE_VFS_H_