Deprecate readFloat and writeFloat, unify byte order to LE on all the platforms of kmath-memory, add test of Memory class

kmath-memory/src/commonMain/kotlin/space/kscience/kmath/memory/Memory.kt

@@ -57,6 +57,7 @@ public interface MemoryReader {
     /**
      * Reads [Float] at certain [offset].
      */
+    @Deprecated("readFloat and writeFloat functions work unexpectedly on JS platform, since because their results are widened when used. Consider using readDouble and writeDouble.")
     public fun readFloat(offset: Int): Float
 
     /**
@@ -113,6 +114,7 @@ public interface MemoryWriter {
     /**
      * Writes [Float] at certain [offset].
      */
+    @Deprecated("readFloat and writeFloat functions work unexpectedly on JS platform, since because their results are widened when used. Consider using readDouble and writeDouble.")
     public fun writeFloat(offset: Int, value: Float)
 
     /**

kmath-memory/src/commonTest/kotlin/kscience/kmath/memory/MemoryTest.kt

@@ -0,0 +1,88 @@
+package kscience.kmath.memory
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+internal class MemoryTest {
+    @Test
+    fun allocateReturnsMemoryWithValidSize() {
+        val mem = Memory.allocate(64)
+        assertEquals(64, mem.size)
+    }
+
+    @Test
+    fun rwByte() {
+        val mem = Memory.allocate(64)
+        mem.write { writeByte(0, 42.toByte()) }
+        assertEquals(42.toByte(), mem.read { readByte(0) })
+        mem.write { writeByte(1, (-4).toByte()) }
+        assertEquals((-4).toByte(), mem.read { readByte(1) })
+    }
+
+    @Test
+    fun rwShort() {
+        val mem = Memory.allocate(64)
+        mem.write { writeShort(0, 44555.toShort()) }
+        assertEquals(44555.toShort(), mem.read { readShort(0) })
+        mem.write { writeShort(2, (-33333).toShort()) }
+        assertEquals((-33333).toShort(), mem.read { readShort(2) })
+    }
+
+    @Test
+    fun rwInt() {
+        val mem = Memory.allocate(64)
+        mem.write { writeInt(0, 1234444444) }
+        assertEquals(1234444444, mem.read { readInt(0) })
+        mem.write { writeInt(4, -5595959) }
+        assertEquals(-5595959, mem.read { readInt(4) })
+    }
+
+    @Test
+    fun rwLong() {
+        val mem = Memory.allocate(64)
+        mem.write { writeLong(0, 1234444444L) }
+        assertEquals(1234444444L, mem.read { readLong(0) })
+        mem.write { writeLong(4, -5595959L) }
+        assertEquals(-5595959L, mem.read { readLong(4) })
+        mem.write { writeLong(8, 1234444444444149L) }
+        assertEquals(1234444444444149L, mem.read { readLong(8) })
+        mem.write { writeLong(16, -50000333595959L) }
+        assertEquals(-50000333595959L, mem.read { readLong(16) })
+    }
+
+    @Suppress("DEPRECATION")
+    @Test
+    fun rwFloat() {
+        val mem = Memory.allocate(64)
+        mem.write { writeFloat(0, 12.12345f) }
+        println(1)
+        assertEquals(12.12345027923584, mem.read { readFloat(0) }.toDouble())
+        mem.write { writeFloat(4, -313.13f) }
+        println(2)
+        assertEquals(-313.1300048828125, mem.read { readFloat(4) }.toDouble())
+        mem.write { writeFloat(8, Float.NaN) }
+        println(3)
+        assertEquals(Float.NaN, mem.read { readFloat(8) })
+        mem.write { writeFloat(12, Float.POSITIVE_INFINITY) }
+        println(4)
+        assertEquals(Float.POSITIVE_INFINITY, mem.read { readFloat(12) })
+        mem.write { writeFloat(12, Float.NEGATIVE_INFINITY) }
+        println(5)
+        assertEquals(Float.NEGATIVE_INFINITY, mem.read { readFloat(12) })
+    }
+
+    @Test
+    fun rwDouble() {
+        val mem = Memory.allocate(64)
+        mem.write { writeDouble(0, 12.12345) }
+        assertEquals(12.12345, mem.read { readDouble(0) })
+        mem.write { writeDouble(8, -313.13) }
+        assertEquals(-313.13, mem.read { readDouble(8) })
+        mem.write { writeDouble(16, Double.NaN) }
+        assertEquals(Double.NaN, mem.read { readDouble(16) })
+        mem.write { writeDouble(24, Double.POSITIVE_INFINITY) }
+        assertEquals(Double.POSITIVE_INFINITY, mem.read { readDouble(24) })
+        mem.write { writeDouble(32, Double.NEGATIVE_INFINITY) }
+        assertEquals(Double.NEGATIVE_INFINITY, mem.read { readDouble(32) })
+    }
+}

kmath-memory/src/jsMain/kotlin/space/kscience/kmath/memory/DataViewMemory.kt

@@ -28,18 +28,18 @@ private class DataViewMemory(val view: DataView) : Memory {
     private val reader: MemoryReader = object : MemoryReader {
         override val memory: Memory get() = this@DataViewMemory
 
-        override fun readDouble(offset: Int): Double = view.getFloat64(offset, false)
+        override fun readDouble(offset: Int): Double = view.getFloat64(offset, true)
 
-        override fun readFloat(offset: Int): Float = view.getFloat32(offset, false)
+        override fun readFloat(offset: Int): Float = view.getFloat32(offset, true)
 
         override fun readByte(offset: Int): Byte = view.getInt8(offset)
 
-        override fun readShort(offset: Int): Short = view.getInt16(offset, false)
+        override fun readShort(offset: Int): Short = view.getInt16(offset, true)
 
-        override fun readInt(offset: Int): Int = view.getInt32(offset, false)
+        override fun readInt(offset: Int): Int = view.getInt32(offset, true)
 
         override fun readLong(offset: Int): Long =
-            view.getInt32(offset, false).toLong() shl 32 or view.getInt32(offset + 4, false).toLong()
+            view.getInt32(offset, true).toLong() shl 32 or view.getInt32(offset + 4, true).toLong()
 
         override fun release() {
             // does nothing on JS
@@ -52,11 +52,11 @@ private class DataViewMemory(val view: DataView) : Memory {
         override val memory: Memory get() = this@DataViewMemory
 
         override fun writeDouble(offset: Int, value: Double) {
-            view.setFloat64(offset, value, false)
+            view.setFloat64(offset, value, true)
         }
 
         override fun writeFloat(offset: Int, value: Float) {
-            view.setFloat32(offset, value, false)
+            view.setFloat32(offset, value, true)
         }
 
         override fun writeByte(offset: Int, value: Byte) {
@@ -64,16 +64,16 @@ private class DataViewMemory(val view: DataView) : Memory {
         }
 
         override fun writeShort(offset: Int, value: Short) {
-            view.setUint16(offset, value, false)
+            view.setUint16(offset, value, true)
         }
 
         override fun writeInt(offset: Int, value: Int) {
-            view.setInt32(offset, value, false)
+            view.setInt32(offset, value, true)
         }
 
         override fun writeLong(offset: Int, value: Long) {
-            view.setInt32(offset, (value shr 32).toInt(), littleEndian = false)
+            view.setInt32(offset, (value shr 32).toInt(), littleEndian = true)
-            view.setInt32(offset + 4, (value and 0xffffffffL).toInt(), littleEndian = false)
+            view.setInt32(offset + 4, (value and 0xffffffffL).toInt(), littleEndian = true)
         }
 
         override fun release() {
@@ -82,7 +82,6 @@ private class DataViewMemory(val view: DataView) : Memory {
     }
 
     override fun writer(): MemoryWriter = writer
-
 }
 
 /**
@@ -98,6 +97,6 @@ public actual fun Memory.Companion.allocate(length: Int): Memory {
  * and could be mutated independently from the resulting [Memory].
  */
 public actual fun Memory.Companion.wrap(array: ByteArray): Memory {
-    @Suppress("CAST_NEVER_SUCCEEDS") val int8Array = array as Int8Array
+    val int8Array = array.unsafeCast<Int8Array>()
     return DataViewMemory(DataView(int8Array.buffer, int8Array.byteOffset, int8Array.length))
 }

kmath-memory/src/jvmMain/kotlin/space/kscience/kmath/memory/ByteBufferMemory.kt

@@ -7,6 +7,7 @@ package space.kscience.kmath.memory
 
 import java.io.IOException
 import java.nio.ByteBuffer
+import java.nio.ByteOrder
 import java.nio.channels.FileChannel
 import java.nio.file.Files
 import java.nio.file.Path
@@ -31,7 +32,7 @@ internal class ByteBufferMemory(
     }
 
     override fun copy(): Memory {
-        val copy = ByteBuffer.allocate(buffer.capacity())
+        val copy = ByteBuffer.allocate(buffer.capacity()).order(ByteOrder.LITTLE_ENDIAN)
         buffer.rewind()
         copy.put(buffer)
         copy.flip()
@@ -99,7 +100,7 @@ internal class ByteBufferMemory(
  * Allocates memory based on a [ByteBuffer].
  */
 public actual fun Memory.Companion.allocate(length: Int): Memory =
-    ByteBufferMemory(checkNotNull(ByteBuffer.allocate(length)))
+    ByteBufferMemory(checkNotNull(ByteBuffer.allocate(length).order(ByteOrder.LITTLE_ENDIAN)))
 
 /**
  * Wraps a [Memory] around existing [ByteArray]. This operation is unsafe since the array is not copied

kmath-memory/src/nativeMain/kotlin/space/kscience/kmath/memory/NativeMemory.kt

@@ -42,7 +42,7 @@ internal class NativeMemory(
         override fun readLong(offset: Int) = array.getLongAt(position(offset))
 
         override fun release() {
-            // does nothing on JVM
+            // does nothing on Native
         }
     }
 
@@ -60,7 +60,7 @@ internal class NativeMemory(
         }
 
         override fun writeByte(offset: Int, value: Byte) {
-            array.set(position(offset), value)
+            array[position(offset)] = value
         }
 
         override fun writeShort(offset: Int, value: Short) {
@@ -76,7 +76,7 @@ internal class NativeMemory(
         }
 
         override fun release() {
-            // does nothing on JVM
+            // does nothing on Native
         }
     }