CHUNK_CHECK_LENGTH
if (check_sz > CHUNK_CHECK_LENGTH)
check_sz = CHUNK_CHECK_LENGTH;
if (check_sz > CHUNK_CHECK_LENGTH)
check_sz = CHUNK_CHECK_LENGTH;
if (check_sz > CHUNK_CHECK_LENGTH)
check_sz = CHUNK_CHECK_LENGTH;
if (check_sz > CHUNK_CHECK_LENGTH)
check_sz = CHUNK_CHECK_LENGTH;
if (sz > CHUNK_CHECK_LENGTH)
sz = CHUNK_CHECK_LENGTH;