refactored int codecs to DRY and easy support signed/unsigned values

src/commonTest/kotlin/bintools/SmartintTest.kt

@@ -1,16 +1,18 @@
 package bintools
 
 import com.icodici.ubdata.Smartint
+import com.icodici.ubdata.Varint
+import net.sergeych.bintools.decode
+import net.sergeych.bintools.encode
 import net.sergeych.bintools.encodeToHex
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
 class SmartintTest {
 
-    fun testValue(x: Long) {
-        assertEquals(x.toULong(), Smartint.decode(Smartint.encode(x.toULong())))
-        assertEquals(x, Smartint.decodeSigned(Smartint.encodeSigned(x)))
-        println("+ ${x}: ${Smartint.encode(x.toULong()).encodeToHex()}")
+    inline fun <reified T:Number>testValue(x: T) {
+        assertEquals(x, Smartint.decode(Smartint.encode(x)))
+        println("+ ${x}: ${Smartint.encode(x).encodeToHex()}")
     }
 
     fun testAround(bits: Int) {
@@ -19,10 +21,12 @@ class SmartintTest {
         var median: Long = (1.toULong() shl bits).toLong()
         for( x in (median-2)..(median+2)) {
             testValue(x)
+            testValue(-x)
         }
         median = median * 3 / 2
         for( x in (median-5)..(median+5)) {
             testValue(x)
+            testValue(-x)
         }
     }
 
@@ -39,6 +43,13 @@ class SmartintTest {
     }
 
     @Test
-    fun decode() {
+    fun compareTest() {
+        for( x in listOf<ULong>(0uL, 1uL, 66uL, 129uL, 219uL, 0x1122uL, 0xFFEEuL, 0xAAbbCCdduL,
+            0x1111222233334444uL, (1UL shl 63))) {
+            //                     1--12--23--34--4
+            println("--- $x / 0x${x.encodeToHex(8)}")
+            println("V: ${Varint.encode(x).encodeToHex()}")
+            println("S: ${Smartint.encode(x).encodeToHex()}")
+        }
     }
 }