import 'dart:collection';
import 'dart:ffi';
import 'dart:io';
import 'dart:typed_data';
import "package:ffi/ffi.dart";

class LengthPointer<T extends NativeType> {
  final Pointer<T> ptr;
  final int length;
  LengthPointer(this.ptr, this.length);
}

Pointer<Uint8> uint8ListToPointer(Uint8List data) {
  final Pointer<Uint8> ptr = malloc<Uint8>(data.length);
  for (int i = 0; i < data.length; ++i) {
    ptr[i] = data[i];
  }
  return ptr;
}

LengthPointer<Uint8> readUint8Ptr(File file) {
  final fileData = file.readAsBytesSync();
  final data = uint8ListToPointer(fileData);
  return LengthPointer<Uint8>(data, fileData.length);
}