support for @Unsigned fields and fox bad error of kotlinjs x is Float glitch: it returns true for integers

src/commonMain/kotlin/net.sergeych.bintools/DataSink.kt

@@ -25,11 +25,7 @@ interface DataSink {
 }
 
 inline fun <reified T:Any>DataSink.writeNumber(value: T) {
-    when(value) {
-        is Float -> writeFloat(value)
-        is Double -> writeDouble(value)
-        else -> Smartint.encode(value, this)
-    }
+    Smartint.encode(value, this)
 }
 
 fun DataSink.writeI32(value: Int) {

src/commonMain/kotlin/net.sergeych.bintools/DataSource.kt

@@ -13,7 +13,7 @@ interface DataSource {
     /**
      * Exception that implementations must throw on end of data
      */
-    class EndOfData() : Exception("no more data available")
+    class EndOfData: Exception("no more data available")
 
     fun readByte(): Byte
 
@@ -51,3 +51,4 @@ inline fun <reified T : Any> DataSource.readNumber(): T = when(typeOf<T>()) {
     typeOf<Float>() -> readFloat() as T
     else -> Smartint.decode(this)
 }
+

src/commonMain/kotlin/net.sergeych.bipack/BipackDecoder.kt

@@ -17,12 +17,14 @@ import net.sergeych.bintools.*
 class BipackDecoder(val input: DataSource, var elementsCount: Int = 0) : AbstractDecoder() {
     private var elementIndex = 0
 
+    private var nextIsUnsigned = false
+
     override val serializersModule: SerializersModule = EmptySerializersModule
     override fun decodeBoolean(): Boolean = input.readByte().toInt() != 0
     override fun decodeByte(): Byte = input.readByte()
-    override fun decodeShort(): Short = input.readNumber()
-    override fun decodeInt(): Int = input.readNumber()
-    override fun decodeLong(): Long = input.readNumber()
+    override fun decodeShort(): Short = if (nextIsUnsigned) input.readNumber<UInt>().toShort() else input.readNumber()
+    override fun decodeInt(): Int = if (nextIsUnsigned) input.readNumber<UInt>().toInt() else input.readNumber()
+    override fun decodeLong(): Long = if (nextIsUnsigned) input.readNumber<ULong>().toLong() else input.readNumber()
     override fun decodeFloat(): Float = input.readFloat()
     override fun decodeDouble(): Double = input.readDouble()
     override fun decodeChar(): Char = Char(input.readNumber<UInt>().toInt())
@@ -37,6 +39,7 @@ class BipackDecoder(val input: DataSource, var elementsCount: Int = 0) : Abstrac
 
     override fun decodeElementIndex(descriptor: SerialDescriptor): Int {
         if (elementIndex >= elementsCount) return CompositeDecoder.DECODE_DONE
+        nextIsUnsigned = descriptor.getElementAnnotations(elementIndex).any { it is Unsigned }
         return elementIndex++
     }
 

src/commonMain/kotlin/net.sergeych.bipack/BipackEncoder.kt

@@ -14,26 +14,49 @@ class BipackEncoder(var output: DataSink) : AbstractEncoder() {
     // used when CRC calculation on the fly
     private var crcSink: CRC32Sink? = null
 
+    private var nextIsUnsigned = false
+
+    override fun encodeElement(descriptor: SerialDescriptor, index: Int): Boolean {
+        return super.encodeElement(descriptor, index).also {
+            println(">> $index: ${descriptor.getElementAnnotations(index)}")
+            nextIsUnsigned = descriptor.getElementAnnotations(index).any { it is Unsigned }
+            println("${descriptor.getElementDescriptor(index)} -> $nextIsUnsigned")
+        }
+    }
+//    fun isUnsigned(): Boolean {
+//
+//        return
+//    }
+
+
     override val serializersModule: SerializersModule = EmptySerializersModule
     override fun encodeBoolean(value: Boolean) = output.writeByte(if (value) 1 else 0)
     override fun encodeByte(value: Byte) = output.writeByte(value.toInt())
-    override fun encodeShort(value: Short) = output.writeNumber(value.toInt())
-    override fun encodeInt(value: Int) = output.writeNumber(value)
+    override fun encodeShort(value: Short) = if( nextIsUnsigned )
+        output.writeNumber(value.toUInt())
+    else
+        output.writeNumber(value.toInt())
+    override fun encodeInt(value: Int) {
+        println("EncodeInt: $value / $nextIsUnsigned")
+        if (nextIsUnsigned)
+            output.writeNumber(value.toUInt())
+        else
+            output.writeNumber(value)
+    }
 
     fun encodeUInt(value: UInt) = output.writeNumber(value)
-    override fun encodeLong(value: Long) = output.writeNumber(value)
-    override fun encodeFloat(value: Float) = output.writeNumber(value)
-    override fun encodeDouble(value: Double) = output.writeI64(value.toRawBits())
+    override fun encodeLong(value: Long) =  if( nextIsUnsigned )
+        output.writeNumber(value.toULong())
+    else
+        output.writeNumber(value)
+    override fun encodeFloat(value: Float) = output.writeFloat(value)
+    override fun encodeDouble(value: Double) = output.writeDouble(value)
     override fun encodeChar(value: Char) = output.writeNumber(value.code.toUInt())
     override fun encodeString(value: String) {
 //        output.writeUTF(value)
         writeBytes(value.encodeToByteArray())
     }
 
-    override fun encodeElement(descriptor: SerialDescriptor, index: Int): Boolean {
-        return super.encodeElement(descriptor, index)
-    }
-
     fun writeBytes(value: ByteArray) {
         output.writeNumber(value.size.toUInt())
         output.writeBytes(value)
@@ -59,8 +82,7 @@ class BipackEncoder(var output: DataSink) : AbstractEncoder() {
                 output.writeU32(
                     CRC.crc32(descriptor.serialName.encodeToByteArray())
                 )
-            }
-            else if( a is ExtendableFormat) {
+            } else if (a is ExtendableFormat) {
                 encodeUInt(descriptor.elementsCount.toUInt())
             }
         }

src/commonMain/kotlin/net.sergeych.bipack/annotations.kt

@@ -26,9 +26,27 @@ annotation class ExtendableFormat
 @SerialInfo
 annotation class Framed
 
+/**
+ * Allow to CRC-protect structures (we suppose to use it with classes only). After the
+ * data block its CRC32 will be written and checked. It is memory-wise: it calculates CRC
+ * on the fly without buffering the data. If used with [Framed] and [ExtendableFormat] the extra
+ * data is protected too.
+ *
+ * __Common pitfalls__. When unpacking corrupted data protected this way, the not only [InvalidFrameCRCException]
+ * can be thrown. Actually, most often you will see [DataSource.EndOfData] exception
+ */
 @SerialInfo
 annotation class CrcProtected
 
+/**
+ * Allow marking data fields as being serialized as usnsigned (applyable also to signed fields lite Int, Long and
+ * Short, if you are shure they will not be negative). As unsigned types are not cully supported by kotlinx.serialization
+ * it is the conly way to tell the serialized to use more compact unsigned variable length encoding.
+ */
+@SerialInfo
+@Target(AnnotationTarget.FIELD,AnnotationTarget.PROPERTY)
+annotation class Unsigned
+
 open class InvalidFrameException(reason: String) : Exception(reason)
 class InvalidFrameHeaderException(reason: String = "Frame header does not match") : InvalidFrameException(reason)
 class InvalidFrameCRCException : InvalidFrameException("Checksum CRC32 failed")

src/commonTest/kotlin/bintools/SmartintTest.kt

@@ -64,4 +64,5 @@ class SmartintTest {
 //        }
         }
     }
+
 }

src/commonTest/kotlin/bipack/BipackEncoderTest.kt

@@ -40,6 +40,17 @@ data class FoobarFP1(val bar: Int, val foo: Int,val other: Int = -1)
 
 class BipackEncoderTest {
 
+    @Serializable
+    data class FoobarSize(val i: Int)
+
+    @Test
+    fun testSize() {
+        println(BipackEncoder.encode(17).toDump())
+        assertEquals(1, BipackEncoder.encode(17).size)
+//        assertEquals(1, BipackEncoder.encode(FoobarSize(17)).size)
+    }
+
+
     @Test
     fun encodeSimple() {
         val a = Foobar1(42)//, "bum")
@@ -87,13 +98,34 @@ class BipackEncoderTest {
     }
 
     @Serializable
-    data class FBU(val u: UInt, val i: Int)
+    data class FBU(
+        @Unsigned
+        val u: UInt,
+        @Unsigned
+        val i: Int,
+        val k: UInt = 3u)
     @Test
     fun testByteArray() {
+//        val z = Foobar1(42)//, "bum")
+//        println(BipackEncoder.encode(z).toDump())
+
         val x = byteArrayOf(1,2,3)
-        println(BipackEncoder.encode(x).toDump())
-        println(BipackEncoder.encode("123").toDump())
-        println(BipackEncoder.encode(FBU(3u, 3)).toDump())
-//        println(BipackEncoder.encode(1U).toDump())
+        var d = BipackEncoder.encode(x)
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+
+        d = BipackEncoder.encode("123")
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+
+        val f = FBU(3u, 3)
+        d = BipackEncoder.encode(f)
+        println(d.toDump())
+        assertEquals(0x0c, d[0])
+        assertEquals(0x0c, d[1])
+        // Signed encoding despite UInt type:
+        assertEquals(0x18, d[2])
+
+        assertEquals(f, BipackDecoder.decode(d))
     }
 }