Add code generator for string attribute

src/packet.rs

@@ -2,7 +2,8 @@ use std::convert::TryInto;
 
 use rand::Rng;
 
-use crate::attributes::Attributes;
+use crate::attribute::Attribute;
+use crate::attributes::{AVPType, Attributes};
 use crate::code::Code;
 
 const MAX_PACKET_LENGTH: usize = 4096;
@@ -177,6 +178,22 @@ impl Packet {
             _ => false,
         }
     }
+
+    pub fn add(&mut self, typ: AVPType, attr: &Attribute) {
+        self.attributes.add(typ, attr.clone());
+    }
+
+    pub fn delete(&mut self, typ: AVPType) {
+        self.attributes.del(typ);
+    }
+
+    pub fn lookup(&self, typ: AVPType) -> Option<&Attribute> {
+        self.attributes.lookup(typ)
+    }
+
+    pub fn lookup_all(&self, typ: AVPType) -> Vec<&Attribute> {
+        self.attributes.lookup_all(typ)
+    }
 }
 
 #[cfg(test)]