code: public static void writeToMemory(byte[] src, Object target, long targetOffset) {
      Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET, target, targetOffset, src.length);
    }
docs: Writes the content of a byte array into a memory address, identified by an object and an
  offset. The target memory address must already been allocated, and have enough space to
  hold all the bytes in this string.