chuanqi/996box-decompiled/jsc-extract/probe-vm.js

// 直接绕过 bytenode,用 vm.Script 试
const fs = require('fs');
const vm = require('vm');

const target = process.argv[2];
const raw = fs.readFileSync(target);
console.log('size:', raw.length);

// 尝试 1:整段作 cachedData
function try1(label, buf) {
  try {
    const s = new vm.Script('"\u200b"', { cachedData: buf });
    console.log(`[${label}] rejected=`, s.cachedDataRejected);
  } catch (e) {
    console.log(`[${label}] ERR:`, e.code, e.message);
  }
}

try1('full', raw);
try1('skip2', raw.subarray(2));      // 去掉 bytenode 头
try1('skip4', raw.subarray(4));      // 去掉更多

// 试 brotli 解压后作 cachedData
const zlib = require('zlib');
for (let skip of [0, 2, 4, 8]) {
  try {
    const d = zlib.brotliDecompressSync(raw.subarray(skip));
    try1(`brotli-skip${skip}`, d);
  } catch (e) { /* skip */ }
}

// 看几个特殊位置的字节
console.log('\n[byte map]');
for (let i = 0; i < 16; i++) {
  console.log(`  [${i}] = 0x${raw[i].toString(16).padStart(2, '0')} (${raw[i]})`);
}