Function check_dump_file 

pub fn check_dump_file(
    _file: &str,
    _sbuf: &Metadata,
    _name: &str,
    _test_only: bool,
) -> Option<(Vec<u32>, bool)>

Port of check_dump_file(char *file, struct stat *sbuf, char *name, int *ksh, int test_only) from Src/parse.c:3833. Opens + validates a .zwc file, returning its loaded buffer or None.