Add getters and contructor for nsec rdata

Author: Litr0

src/message/rdata/nsec_rdata.rs

@@ -0,0 +1,49 @@
+use crate::message::resource_record::{FromBytes, ToBytes};
+use crate::domain_name::DomainName;
+use crate::message::type_rtype::Rtype;
+
+#[derive(Clone, Debug, PartialEq)]
+/// Struct for NSEC Rdata
+/// [RFC 4034](https://tools.ietf.org/html/rfc4034#section-4.1)
+///                        1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
+///  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+/// /                      Next Domain Name                         /
+/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+/// /                       Type Bit Maps                           /
+/// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+pub struct NsecRdata {
+    pub next_domain_name: DomainName,
+    pub type_bit_maps: Vec<Rtype>,
+}
+
+impl NsecRdata{
+    /// Creates a new `NsecRdata` with next_domain_name and type_bit_maps
+    pub fn new(next_domain_name: DomainName, type_bit_maps: Vec<Rtype>) -> Self {
+        NsecRdata {
+            next_domain_name,
+            type_bit_maps,
+        }
+    }
+
+    /// Returns the next_domain_name of the `NsecRdata`.
+    /// # Example
+    /// ```
+    /// let nsec_rdata = NsecRdata::new(String::from("www.example.com"), vec![Rtype::A, Rtype::NS]);
+    /// assert_eq!(nsec_rdata.get_next_domain_name().get_name(), String::from("www.example.com"));
+    /// ```
+    pub fn get_next_domain_name(&self) -> DomainName {
+        self.next_domain_name.clone()
+    }
+
+    /// Returns the type_bit_maps of the `NsecRdata`.
+    /// # Example
+    /// ```
+    /// let nsec_rdata = NsecRdata::new(String::from("www.example.com"), vec![Rtype::A, Rtype::NS]);
+    /// assert_eq!(nsec_rdata.get_type_bit_maps(), vec![Rtype::A, Rtype::NS]);
+    /// ```
+    pub fn get_type_bit_maps(&self) -> Vec<Rtype> {
+        self.type_bit_maps.clone()
+    }
+}