feat: initial commit of Railtrack Pro prototype with complete test suite

node_modules/@exodus/bytes/array.js

@@ -0,0 +1,35 @@
+import { assertTypedArray } from './assert.js'
+
+const Buffer = globalThis.Buffer // Buffer is optional
+
+export function typedView(arr, format) {
+  assertTypedArray(arr)
+  switch (format) {
+    case 'uint8':
+      if (arr.constructor === Uint8Array) return arr // fast path
+      return new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength)
+    case 'buffer':
+      if (arr.constructor === Buffer && Buffer.isBuffer(arr)) return arr
+      return Buffer.from(arr.buffer, arr.byteOffset, arr.byteLength)
+  }
+
+  throw new TypeError('Unexpected format')
+}
+
+export function typedCopyBytes(arr, format) {
+  assertTypedArray(arr)
+  if (!(arr instanceof Uint8Array)) {
+    arr = new Uint8Array(arr.buffer, arr.byteOffset, arr.byteLength)
+  }
+
+  switch (format) {
+    case 'uint8':
+      return Uint8Array.from(arr) // never pooled
+    case 'buffer':
+      return Buffer.from(arr)
+    case 'arraybuffer':
+      return Uint8Array.from(arr).buffer
+  }
+
+  throw new TypeError('Unexpected format')
+}