feat(DataView, ConstDataView)

src/ConstDataView.js

@@ -0,0 +1,31 @@
+import { memcpy, Type } from "."
+
+export function ConstDataView(size) {
+  const obj = { _size: size }
+  Object.setPrototypeOf(obj, ConstDataView.prototype)
+  obj.new(ConstDataView, arguments)
+  return obj
+}
+ConstDataView.prototype.serialize = function(dv, src) {
+  if (dv.byteLength < this._size) {
+    throw new Error('too small buffer')
+  }
+  memcpy(dv, src)
+  return
+}
+ConstDataView.prototype.parse = function(dv) {
+  const res_buffer = new ArrayBuffer(this._size)
+  const res_dv = new DataView(res_buffer)
+
+  memcpy(res_dv, dv)
+
+  return res_dv
+}
+ConstDataView.prototype.isHeadless = function() {
+  return false
+}
+ConstDataView.prototype.sizeof = function() {
+  return this._size
+}
+Object.setPrototypeOf(ConstDataView.prototype, Type.prototype)
+Object.freeze(ConstDataView.prototype)