Class Reader

g2all/700/psfree.js:338–372

}

class Reader {
  constructor(rstr, rstr_view) {
    this.rstr = rstr;
    this.rstr_view = rstr_view;
    this.m_data = rstr_view.read64(off.strimpl_m_data);
  }

  read8_at(offset) {
    return this.rstr.charCodeAt(offset);
  }

  read32_at(offset) {
    const str = this.rstr;
    return (str.charCodeAt(offset) | (str.charCodeAt(offset + 1) << 8) | (str.charCodeAt(offset + 2) << 16) | (str.charCodeAt(offset + 3) << 24)) >>> 0;
  }

  read64_at(offset) {
    return sread64(this.rstr, offset);
  }

  read64(addr) {
    this.rstr_view.write64(off.strimpl_m_data, addr);
    return sread64(this.rstr, 0);
  }

  set_addr(addr) {
    this.rstr_view.write64(off.strimpl_m_data, addr);
  }

  // remember to use this to fix up the StringImpl before freeing it
  restore() {
    this.rstr_view.write64(off.strimpl_m_data, this.m_data);
    this.rstr_view.write32(off.strimpl_strlen, original_strlen);
  }
}

// we now have a double free on the fastMalloc heap
async function make_rdr(view) {