Removed unsigned numbers from RawNumberReader + added test

kotlinx-serialization-smile-core/src/commonMain/kotlin/io/github/vooft/kotlinsmile/decoder/raw/RawNumberReader.kt

@@ -1,28 +1,29 @@
 package io.github.vooft.kotlinsmile.decoder.raw
 
 import io.github.vooft.kotlinsmile.common.ByteArrayIterator
+import kotlin.experimental.and
 import kotlin.experimental.xor
 
 fun ByteArrayIterator.nextRawInt(): Int {
     var result = 0
     var byte = next()
-    while (byte.toUInt() and FIRST_BIT_MASK == 0u) {
+    while (byte and FIRST_BIT_MASK == 0.toByte()) {
         result = (result shl 7) or byte.toInt()
         byte = next()
     }
 
-    return (result shl 6) or (byte xor FIRST_BIT_MASK.toByte()).toInt()
+    return (result shl 6) or (byte xor FIRST_BIT_MASK).toInt()
 }
 
 fun ByteArrayIterator.nextRawLong(): Long {
     var result = 0L
     var byte = next()
-    while (byte.toUInt() and FIRST_BIT_MASK == 0u) {
+    while (byte and FIRST_BIT_MASK == 0.toByte()) {
         result = (result shl 7) or byte.toLong()
         byte = next()
     }
 
-    return (result shl 6) or (byte xor FIRST_BIT_MASK.toByte()).toLong()
+    return (result shl 6) or (byte xor FIRST_BIT_MASK).toLong()
 }
 
-private const val FIRST_BIT_MASK = 0b1000_0000u
+private const val FIRST_BIT_MASK: Byte = 0b1000_0000.toByte()

kotlinx-serialization-smile-core/src/commonTest/kotlin/io/github/vooft/kotlinsmile/decoder/raw/RawNumberReaderTest.kt

@@ -0,0 +1,55 @@
+package io.github.vooft.kotlinsmile.decoder.raw
+
+import io.github.vooft.kotlinsmile.common.ByteArrayIteratorImpl
+import io.kotest.matchers.shouldBe
+import kotlin.test.Test
+
+class RawNumberReaderTest {
+    @Test
+    fun should_read_raw_int() {
+        val expected = 12345
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x01, 0x40, 0xB9.toByte()))
+
+        iterator.nextRawInt() shouldBe expected
+    }
+
+    @Test
+    fun should_read_raw_max_int() {
+        val expected = Int.MAX_VALUE
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x0F, 0x7F, 0x7F, 0x7F, 0xBF.toByte()))
+
+        iterator.nextRawInt() shouldBe expected
+    }
+
+    @Test
+    fun should_read_raw_min_int() {
+        val expected = Int.MIN_VALUE
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x10, 0x00, 0x00, 0x00, 0x80.toByte()))
+
+        iterator.nextRawInt() shouldBe expected
+    }
+
+    @Test
+    fun should_read_raw_long() {
+        val expected = 123456789L
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x75, 0x5E, 0x34, 0x95.toByte()))
+
+        iterator.nextRawLong() shouldBe expected
+    }
+
+    @Test
+    fun should_read_raw_max_long() {
+        val expected = Long.MAX_VALUE
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x01, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0xBF.toByte()))
+
+        iterator.nextRawLong() shouldBe expected
+    }
+
+    @Test
+    fun should_read_raw_min_long() {
+        val expected = Long.MIN_VALUE
+        val iterator = ByteArrayIteratorImpl(byteArrayOf(0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80.toByte()))
+
+        iterator.nextRawLong() shouldBe expected
+    }
+}