fs.mitm: experimental support for save redirection to sd.

stratosphere/ams_mitm/source/fs_mitm/fs_shim.c

@@ -225,6 +225,46 @@ Result fsOpenFileSystemWithIdFwd(Service* s, FsFileSystem* out, u64 titleId, FsF
     return rc;
 }
 
+Result fsOpenSaveDataFileSystemFwd(Service *s, FsFileSystem* out, u8 inval, FsSave *save) {
+    IpcCommand c;
+    ipcInitialize(&c);
+
+    struct {
+        u64 magic;
+        u64 cmd_id;
+        u64 inval;//Actually u8.
+        FsSave save;
+    } PACKED *raw;
+
+    raw = serviceIpcPrepareHeader(s, &c, sizeof(*raw));
+
+    raw->magic = SFCI_MAGIC;
+    raw->cmd_id = 51;
+    raw->inval = (u64)inval;
+    memcpy(&raw->save, save, sizeof(FsSave));
+
+    Result rc = serviceIpcDispatch(s);
+
+    if (R_SUCCEEDED(rc)) {
+        IpcParsedCommand r;
+        struct {
+            u64 magic;
+            u64 result;
+        } *resp;
+
+        serviceIpcParse(s, &r, sizeof(*resp));
+        resp = r.Raw;
+
+        rc = resp->result;
+
+        if (R_SUCCEEDED(rc)) {
+            serviceCreateSubservice(&out->s, s, &r, 0);
+        }
+    }
+
+    return rc;
+}
+
 /* Missing FS File commands. */
 Result fsFileOperateRange(FsFile* f, u32 op_id, u64 off, u64 len, FsRangeInfo *out) {
     IpcCommand c;