sclass ROMIntMemoryFromFile implements IIntMemory, AutoCloseable {
  File file;
  int size;
  RandomAccessFile raf;
  bool bigEndian;
  
  *(File *file) {
    size = toInt_safe(fileSize(file)/4);
    raf = randomAccessFileForReading(file);
  }
  
  public void close {
    dispose raf;
  }
  
  public int get(int idx) ctex {
    rangeCheck(idx, size);
    raf.seek(idx*4L);
    ret bigEndian ? raf.readInt() : raf_readLittleEndianInt(raf);
  }
  
  public void set(int idx, int val) {
    fail("read-only");
  }
  
  public int size() {
    ret size;
  }
}

Began life as a copy of #1029248