feat: pointers

.gitignore

@@ -0,0 +1 @@
+/.vscode

types/pointer/pointer.ts

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+import { AlignedType } from "../types.ts";
+import { endianess } from "../../utils.ts";
+
+export class Pointer<T> implements AlignedType<T> {
+  byteLength = 8;
+  byteAlign = 8;
+  type;
+  endian;
+
+  constructor(type: AlignedType<T>, endian = endianess) {
+    this.type = type;
+    this.endian = endian;
+  }
+
+  read(dataView: DataView, byteOffset = 0): T {
+    const ptr = dataView.getBigUint64(byteOffset, this.endian);
+    const view = new Deno.UnsafePointerView(Deno.UnsafePointer.create(ptr)!);
+    const bufview = new DataView(view.getArrayBuffer(this.type.byteLength));
+    return this.type.read(bufview);
+  }
+
+  write(value: T, dataView: DataView, byteOffset = 0) {
+    const buffer = new ArrayBuffer(this.type.byteLength);
+    this.type.write(value, new DataView(buffer))
+    const ptr = Deno.UnsafePointer.value(Deno.UnsafePointer.of(buffer));
+    dataView.setBigUint64(byteOffset, BigInt(ptr), this.endian);
+    return dataView.buffer;
+  }
+}
+
+export const pointer = <T>(type: AlignedType<T>) => new Pointer(type);