add more helpers

src/tests/utils/helpers.test.ts

@@ -0,0 +1,46 @@
+import {
+	areDataViewsEqual,
+	nodeBufferToDataView,
+	dataViewToNodeBuffer,
+	nodeBufferToArrayBuffer,
+	arrayBufferToNodeBuffer
+} from '../../utils/helpers';
+
+test('nodeBufferToDataView() and dataViewToNodeBuffer()', () =>
+{
+	const array = new Uint8Array(
+		[
+			0x01, 0x02, 0x03, 0x04,
+			0x05, 0x06, 0x07, 0x08
+		]
+	);
+
+	const view1 = new DataView(
+		array.buffer,
+		array.byteOffset,
+		array.byteLength
+	);
+
+	const nodeBuffer = dataViewToNodeBuffer(view1);
+	const view2 = nodeBufferToDataView(nodeBuffer);
+
+	expect(areDataViewsEqual(view1, view2)).toBe(true);
+});
+
+test('nodeBufferToArrayBuffer() and arrayBufferToNodeBuffer()', () =>
+{
+	const array = new Uint8Array(
+		[
+			0x01, 0x02, 0x03, 0x04,
+			0x05, 0x06, 0x07, 0x08
+		]
+	);
+
+	const arrayBuffer1 = array.buffer;
+	const nodeBuffer = arrayBufferToNodeBuffer(arrayBuffer1);
+	const arrayBuffer2 = nodeBufferToArrayBuffer(nodeBuffer);
+	const view1 = new DataView(arrayBuffer1);
+	const view2 = new DataView(arrayBuffer2);
+
+	expect(areDataViewsEqual(view1, view2)).toBe(true);
+});

src/utils/helpers.ts

@@ -134,9 +134,23 @@ export function areDataViewsEqual(view1: DataView, view2: DataView)
  * @remarks
  * - Just for Node.js.
  */
-export function nodeBufferToDataView(buffer: Buffer): DataView
+export function nodeBufferToDataView(nodeBuffer: Buffer): DataView
 {
-	return new DataView(buffer.buffer, buffer.byteOffset, buffer.byteLength);
+	return new DataView(
+		nodeBuffer.buffer, nodeBuffer.byteOffset, nodeBuffer.byteLength
+	);
+}
+
+/**
+ * Convert DataView to Node.js Buffer using the same underlying ArrayBuffer.
+ *
+ * @category Utils
+ * @remarks
+ * - Just for Node.js.
+ */
+export function dataViewToNodeBuffer(view: DataView): Buffer
+{
+	return Buffer.from(view.buffer, view.byteOffset, view.byteLength);
 }
 
 /**
@@ -146,9 +160,23 @@ export function nodeBufferToDataView(buffer: Buffer): DataView
  * @remarks
  * - Just for Node.js.
  */
-export function nodeBufferToArrayBuffer(buffer: Buffer): ArrayBuffer
+export function nodeBufferToArrayBuffer(nodeBuffer: Buffer): ArrayBuffer
+{
+	return nodeBuffer.buffer.slice(
+		nodeBuffer.byteOffset, nodeBuffer.byteOffset + nodeBuffer.byteLength
+	);
+}
+
+/**
+ * Convert ArrayBuffer to Node.js Buffer.
+ *
+ * @category Utils
+ * @remarks
+ * - Just for Node.js.
+ */
+export function arrayBufferToNodeBuffer(arrayBuffer: ArrayBuffer): Buffer
 {
-	return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
+	return Buffer.from(arrayBuffer, 0, arrayBuffer.byteLength);
 }
 
 /**
@@ -205,11 +233,11 @@ export function dataViewToString(view: DataView): string
  *
  * @category Utils
  */
-export function arrayBufferToString(buffer: ArrayBuffer): string
+export function arrayBufferToString(arrayBuffer: ArrayBuffer): string
 {
 	const decoder = new TextDecoder();
 
-	return decoder.decode(buffer);
+	return decoder.decode(arrayBuffer);
 }
 
 /**