BIO_FLAGS_MEM_RDONLY
bio->flags |= BIO_FLAGS_MEM_RDONLY;
if (bio->flags & BIO_FLAGS_MEM_RDONLY)
if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
if (!(bio->flags & BIO_FLAGS_MEM_RDONLY)) {
BIO_set_flags(mbio, BIO_FLAGS_MEM_RDONLY);
BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
BIO_set_flags(mem, BIO_FLAGS_MEM_RDONLY);