implement composition

src/commonMain/kotlin/com/infendro/encoding/Base10.kt

@@ -0,0 +1,5 @@
+package com.infendro.encoding
+
+private val alphabet = "0123456789".encodeToByteArray()
+
+object Base10 : Encoding by NumericEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base16.kt

@@ -0,0 +1,5 @@
+package com.infendro.encoding
+
+private val alphabet = "0123456789ABCDEF".encodeToByteArray()
+
+object Base16 : Encoding by StreamEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base2.kt

@@ -0,0 +1,5 @@
+package com.infendro.encoding
+
+private val alphabet = "01".encodeToByteArray()
+
+object Base2 : Encoding by StreamEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base32.kt

@@ -1,6 +1,6 @@
-package com.infendro.encoding.stream
+package com.infendro.encoding
 
 private val alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567".encodeToByteArray()
 private const val padding = '='.code.toByte()
 
-object Base32 : StreamEncoding(alphabet, padding)
+object Base32 : Encoding by StreamEncoding(alphabet, padding)

src/commonMain/kotlin/com/infendro/encoding/Base36.kt

@@ -1,5 +1,5 @@
-package com.infendro.encoding.numeric
+package com.infendro.encoding
 
 private val alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".encodeToByteArray()
 
-object Base36 : NumericEncoding(alphabet)
+object Base36 : Encoding by NumericEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base56.kt

@@ -1,5 +1,5 @@
-package com.infendro.encoding.numeric
+package com.infendro.encoding
 
 private val alphabet = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz".encodeToByteArray()
 
-object Base56 : NumericEncoding(alphabet)
+object Base56 : Encoding by NumericEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base58.kt

@@ -1,5 +1,5 @@
-package com.infendro.encoding.numeric
+package com.infendro.encoding
 
 private val alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz".encodeToByteArray()
 
-object Base58 : NumericEncoding(alphabet)
+object Base58 : Encoding by NumericEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base62.kt

@@ -1,5 +1,5 @@
-package com.infendro.encoding.numeric
+package com.infendro.encoding
 
 private val alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".encodeToByteArray()
 
-object Base62 : NumericEncoding(alphabet)
+object Base62 : Encoding by NumericEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Base64.kt

@@ -1,6 +1,6 @@
-package com.infendro.encoding.stream
+package com.infendro.encoding
 
 private val alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".encodeToByteArray()
 private const val padding = '='.code.toByte()
 
-object Base64 : StreamEncoding(alphabet, padding)
+object Base64 : Encoding by StreamEncoding(alphabet, padding)

src/commonMain/kotlin/com/infendro/encoding/Base8.kt

@@ -0,0 +1,5 @@
+package com.infendro.encoding
+
+private val alphabet = "01234567".encodeToByteArray()
+
+object Base8 : Encoding by StreamEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/Encoding.kt

@@ -1,15 +1,10 @@
 package com.infendro.encoding
 
-abstract class Encoding(
-    val alphabet: ByteArray,
-) {
-    init {
-        require(alphabet.isNotEmpty())
-    }
-
+interface Encoding {
+    val alphabet: ByteArray
     val base: Int
         get() = alphabet.size
 
-    abstract fun encode(bytes: ByteArray): ByteArray
-    abstract fun decode(bytes: ByteArray): ByteArray
+    fun encode(bytes: ByteArray): ByteArray
+    fun decode(bytes: ByteArray): ByteArray
 }

src/commonMain/kotlin/com/infendro/encoding/NumericEncoding.kt

@@ -1,22 +1,21 @@
-package com.infendro.encoding.numeric
+package com.infendro.encoding
 
-import com.infendro.encoding.Encoding
 import com.infendro.encoding.exception.IllegalByteException
 import com.infendro.encoding.util.BigInt
 import com.infendro.encoding.util.log2
 import kotlin.math.ceil
 
-open class NumericEncoding(
-    alphabet: ByteArray,
-) : Encoding(alphabet) {
+class NumericEncoding internal constructor(
+    override val alphabet: ByteArray,
+) : Encoding {
     override fun encode(bytes: ByteArray): ByteArray {
         if (bytes.isEmpty()) return byteArrayOf()
 
         val size = ceil(bytes.size * 8 / log2(base)).toInt()
         val result = ByteArray(size)
 
-        var x = BigInt.from(bytes)
         var i = result.size
+        var x = BigInt.from(bytes)
         while (!x.isZero()) {
             val (quotient, remainder) = x.divRem(base)
             x = quotient

src/commonMain/kotlin/com/infendro/encoding/StreamEncoding.kt

@@ -1,16 +1,15 @@
-package com.infendro.encoding.stream
+package com.infendro.encoding
 
-import com.infendro.encoding.Encoding
 import com.infendro.encoding.exception.IllegalByteException
 import com.infendro.encoding.util.align
 import com.infendro.encoding.util.divCeil
 import com.infendro.encoding.util.lcm
 import com.infendro.encoding.util.log2
 
-open class StreamEncoding(
-    alphabet: ByteArray,
+class StreamEncoding internal constructor(
+    override val alphabet: ByteArray,
     private val padding: Byte? = null,
-) : Encoding(alphabet) {
+) : Encoding {
     init {
         require(base and (base - 1) == 0)
     }
@@ -30,7 +29,6 @@ open class StreamEncoding(
         var r = 0
         var buffer = 0
         var bufferBits = 0
-
         for (i in bytes.indices) {
             buffer = (buffer shl 8) + bytes[i]
             bufferBits += 8
@@ -71,7 +69,6 @@ open class StreamEncoding(
         var r = 0
         var buffer = 0
         var bufferBits = 0
-
         for (i in bytes.indices) {
             val byte = bytes[i]
             if (byte == padding) break

src/commonMain/kotlin/com/infendro/encoding/stream/Base16.kt

@@ -1,5 +0,0 @@
-package com.infendro.encoding.stream
-
-private val alphabet = "0123456789ABCDEF".encodeToByteArray()
-
-object Base16 : StreamEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/stream/Base2.kt

@@ -1,5 +0,0 @@
-package com.infendro.encoding.stream
-
-private val alphabet = "01".encodeToByteArray()
-
-object Base2 : StreamEncoding(alphabet)

src/commonMain/kotlin/com/infendro/encoding/stream/Base8.kt

@@ -1,5 +0,0 @@
-package com.infendro.encoding.stream
-
-private val alphabet = "01234567".encodeToByteArray()
-
-object Base8 : StreamEncoding(alphabet)