ex_words
ex->ex_bn = be32toh(dex->ex_words[0]) & 0x00ffffff;
ex->ex_offset = be32toh(dex->ex_words[1]) & 0x00ffffff;
dex->ex_words[0] = htobe32(ex->ex_bn);
dex->ex_words[1] = htobe32(ex->ex_offset);