diff --git a/Sources/CDRCodable/Encoder/CDREncoder.swift b/Sources/CDRCodable/Encoder/CDREncoder.swift
index 4c02fc8..964513e 100644
--- a/Sources/CDRCodable/Encoder/CDREncoder.swift
+++ b/Sources/CDRCodable/Encoder/CDREncoder.swift
@@ -31,6 +31,7 @@ final public class CDREncoder {
         }
         
         encoder = nil       // call deinit and finalize dataBlock changes.
+        // Final data aligment
         let aligment = dataBlock.data.count % 4
         if aligment != 0 {
             for _ in 0..<4-aligment {
@@ -45,6 +46,8 @@ final public class CDREncoder {
 
 protocol _CDREncodingContainer {
     var dataStore: _CDREncoder.DataStore { get }
+    var codingPath: [CodingKey] { get set }
+    func write(count: Int) throws
 }
 
 final class _CDREncoder {
@@ -119,3 +122,13 @@ extension _CDREncoder.DataStore {
         self.data.append(contentsOf: value.bytes)
     }
 }
+
+extension _CDREncodingContainer {
+    func write(count: Int) throws {
+        guard let uint32 = UInt32(exactly: count) else {
+            let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode data of length \(count).")
+            throw EncodingError.invalidValue(count, context)
+        }
+        dataStore.write(value: uint32)
+    }
+}
diff --git a/Sources/CDRCodable/Encoder/KeyedEncodingContainer.swift b/Sources/CDRCodable/Encoder/KeyedEncodingContainer.swift
index b173313..bb5be5f 100644
--- a/Sources/CDRCodable/Encoder/KeyedEncodingContainer.swift
+++ b/Sources/CDRCodable/Encoder/KeyedEncodingContainer.swift
@@ -21,11 +21,7 @@ extension _CDREncoder {
 extension _CDREncoder.KeyedContainer: KeyedEncodingContainerProtocol {
     @inline(__always)
     private func encodeNumericArray(count: Int, size: Int, pointer: UnsafeRawBufferPointer) throws {
-        guard let uint32 = UInt32(exactly: count) else {
-            let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode data of length \(count).")
-            throw EncodingError.invalidValue(count, context)
-        }
-        dataStore.write(value: uint32)
+        try write(count: count)
         self.dataStore.data.append(pointer.baseAddress!.assumingMemoryBound(to: UInt8.self), count: count * size)
     }
 
@@ -48,12 +44,7 @@ extension _CDREncoder.KeyedContainer: KeyedEncodingContainerProtocol {
         }
         let length = data.count + 1
 
-        if let uint32 = UInt32(exactly: length) {
-            dataStore.write(value: uint32)
-        } else {
-            let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode string with length \(length).")
-            throw EncodingError.invalidValue(value, context)
-        }
+        try write(count: length)
         dataStore.write(data: data)
         dataStore.writeByte(0)
     }
@@ -85,11 +76,7 @@ extension _CDREncoder.KeyedContainer: KeyedEncodingContainerProtocol {
         case let value as [Float]: try encodeNumericArray(count: value.count, size: MemoryLayout<Float>.size, pointer: value.withUnsafeBytes{ $0 })
         case let value as [Double]: try encodeNumericArray(count: value.count, size: MemoryLayout<Double>.size, pointer: value.withUnsafeBytes{ $0 })
         case let value as Data:
-            guard let uint32 = UInt32(exactly: value.count) else {
-                let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode data of length \(value.count).")
-                throw EncodingError.invalidValue(value.count, context)
-            }
-            dataStore.write(value: uint32)
+            try write(count: value.count)
             dataStore.write(data: value)
         default:
             let encoder = _CDREncoder(data: self.dataStore)
diff --git a/Sources/CDRCodable/Encoder/SingleValueEncodingContainer.swift b/Sources/CDRCodable/Encoder/SingleValueEncodingContainer.swift
index ec56701..b5edab2 100644
--- a/Sources/CDRCodable/Encoder/SingleValueEncodingContainer.swift
+++ b/Sources/CDRCodable/Encoder/SingleValueEncodingContainer.swift
@@ -1,7 +1,7 @@
 import Foundation
 
 extension _CDREncoder {
-    final class SingleValueContainer {
+    final class SingleValueContainer: _CDREncodingContainer {
         var codingPath: [CodingKey]
         var userInfo: [CodingUserInfoKey: Any]
         var dataStore: DataStore
@@ -34,12 +34,7 @@ extension _CDREncoder.SingleValueContainer: SingleValueEncodingContainer {
         }
         let length = data.count + 1
 
-        if let uint32 = UInt32(exactly: length) {
-            dataStore.write(value: uint32)
-        } else {
-            let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode string with length \(length).")
-            throw EncodingError.invalidValue(value, context)
-        }
+        try write(count: length)
         dataStore.write(data: data)
         dataStore.writeByte(0)
     }
@@ -57,14 +52,8 @@ extension _CDREncoder.SingleValueContainer: SingleValueEncodingContainer {
     }
 
     func encode(_ value: Data) throws {
-        let length = value.count
-        if let uint32 = UInt32(exactly: length) {
-            dataStore.write(value: uint32)
-            dataStore.write(data: value)
-        } else {
-            let context = EncodingError.Context(codingPath: self.codingPath, debugDescription: "Cannot encode data of length \(value.count).")
-            throw EncodingError.invalidValue(value, context)
-        }
+        try write(count: value.count)
+        dataStore.write(data: value)
     }
     
     func encode<T>(_ value: T) throws where T : Encodable {
@@ -77,5 +66,3 @@ extension _CDREncoder.SingleValueContainer: SingleValueEncodingContainer {
         }
     }
 }
-
-extension _CDREncoder.SingleValueContainer: _CDREncodingContainer {}
diff --git a/Sources/CDRCodable/Encoder/UnkeyedEncodingContainer.swift b/Sources/CDRCodable/Encoder/UnkeyedEncodingContainer.swift
index 5c47e08..f8d6bc6 100644
--- a/Sources/CDRCodable/Encoder/UnkeyedEncodingContainer.swift
+++ b/Sources/CDRCodable/Encoder/UnkeyedEncodingContainer.swift
@@ -1,7 +1,7 @@
 import Foundation
 
 extension _CDREncoder {
-    final class UnkeyedContainer {
+    final class UnkeyedContainer: _CDREncodingContainer {
         var count: Int = 0
         private var index: Data.Index
         var codingPath: [CodingKey]
@@ -53,5 +53,3 @@ extension _CDREncoder.UnkeyedContainer: UnkeyedEncodingContainer {
         fatalError("Unimplemented")
     }
 }
-
-extension _CDREncoder.UnkeyedContainer: _CDREncodingContainer {}