diff --git a/src/rust_ffi/src/codec/common_code.rs b/src/rust_ffi/src/codec/common_code.rs
index 73beac1..2571384 100644
--- a/src/rust_ffi/src/codec/common_code.rs
+++ b/src/rust_ffi/src/codec/common_code.rs
@@ -1,3 +1,5 @@
+use std::fmt;
+use super::ShortCode;
 use super::ffi as codec_ffi;
 
 #[derive(Debug)]
@@ -5,12 +7,64 @@ pub struct CommonCode {
     code: u64
 }
 
-impl CommonCode {
+impl Eq for CommonCode {}
+
+impl PartialEq for CommonCode {
+    fn eq(&self, other: &Self) -> bool {
+        self.code == other.code
+    }
+}
 
+impl fmt::Display for CommonCode {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        // TODO: using hex output of CommonCode
+        write!(f, "{}", self.code)
+    }
+}
+
+impl CommonCode {
     pub(crate) fn new(common_code: u64) -> CommonCode {
         CommonCode {
             code: common_code
         }
     }
 
+    pub fn from(common_code: u64) -> Result<CommonCode, &'static str> {
+        match codec_ffi::common_code_check(common_code) {
+            true => Ok(CommonCode {
+                code: common_code
+            }),
+            _ => Err("invalid common code"),
+        }
+    }
+
+    pub fn from_str(common_code: &str) -> Result<CommonCode, &'static str> {
+        Ok(CommonCode {
+            code: codec_ffi::common_code_from_string(common_code)?
+        })
+    }
+
+    // TODO: from RawCode (u64 / RawCode)
+    // TODO: from ShortCode (u32 / String / CommonCode)
+
+    pub fn to_string(&self, shorten: bool) -> String {
+        match shorten {
+            true => codec_ffi::common_code_to_string_unsafe(self.code),
+            false => codec_ffi::common_code_to_string_shorten_unsafe(self.code),
+        }
+    }
+
+    // TODO: to_string_shorten
+
+    pub fn to_short_code(&self) -> ShortCode {
+        ShortCode::new(
+            codec_ffi::common_code_to_short_code_unsafe(self.code)
+        )
+    }
+
+    // TODO: to RawCode
+
+    pub fn unwrap(&self) -> u64 {
+        self.code
+    }
 }
diff --git a/src/rust_ffi/src/codec/mod.rs b/src/rust_ffi/src/codec/mod.rs
index 90613b4..a308c1d 100644
--- a/src/rust_ffi/src/codec/mod.rs
+++ b/src/rust_ffi/src/codec/mod.rs
@@ -2,20 +2,38 @@ mod ffi;
 mod short_code;
 mod common_code;
 
-use short_code::ShortCode;
-use common_code::CommonCode;
+pub use short_code::ShortCode;
+pub use common_code::CommonCode;
 
 pub fn demo() {
-    let s = ShortCode::from(12345678).unwrap();
+    let s = ShortCode::from(4091296).unwrap();
+    println!("{}", s.unwrap());
     println!("{:?}", s);
     println!("{}", s);
-    println!("{}", s.to_string());
 
-    let s = ShortCode::from_str("CSSBF").unwrap();
-    println!("{}", s.unwrap());
+    let s = ShortCode::from_str("4WVE1").unwrap();
+    println!("{}", s);
 
     println!("ShortCode warm up");
     ShortCode::warm_up();
     println!("ShortCode warm up fast");
     ShortCode::warm_up_fast();
+
+    println!("{}", s.to_string());
+    println!("{:?}", s.to_common_code());
+
+    let c = CommonCode::from(0x1A9BF0C00).unwrap();
+    println!("{}", c.unwrap());
+    println!("{:?}", c);
+    println!("{}", c);
+
+    let c = CommonCode::from_str("1A9BF0C00").unwrap();
+    println!("{}", c);
+    let c = CommonCode::from_str("1A9BF0C").unwrap();
+    println!("{}", c);
+
+    println!("{}", c.to_string(false));
+    println!("{}", c.to_string(true));
+    println!("{}", c.to_short_code());
+
 }
diff --git a/src/rust_ffi/src/codec/short_code.rs b/src/rust_ffi/src/codec/short_code.rs
index a827fc6..647040c 100644
--- a/src/rust_ffi/src/codec/short_code.rs
+++ b/src/rust_ffi/src/codec/short_code.rs
@@ -22,6 +22,12 @@ impl fmt::Display for ShortCode {
 }
 
 impl ShortCode {
+    pub(crate) fn new(short_code: u32) -> ShortCode {
+        ShortCode {
+            code: short_code
+        }
+    }
+
     pub fn from(short_code: u32) -> Result<ShortCode, &'static str> {
         match codec_ffi::short_code_check(short_code) {
             true => Ok(ShortCode {
@@ -37,12 +43,15 @@ impl ShortCode {
         })
     }
 
-    // TODO: from CommonCode (u32 / String / CommonCode)
+    // TODO: from RawCode (u64 / RawCode)
+    // TODO: from CommonCode (u64 / String / CommonCode)
 
     pub fn to_string(&self) -> String {
         codec_ffi::short_code_to_string_unsafe(self.code)
     }
 
+    // TODO: to RawCode
+
     pub fn to_common_code(&self) -> CommonCode {
         CommonCode::new(
             codec_ffi::short_code_to_common_code_unsafe(self.code)