wechat-web-devtools-linux/tools/wxvpkg_pack.js

#!/usr/bin/env node

// https://gist.github.com/chemzqm/9f2334ca201dc2fbc363fdd757aa2ed4
const path = require('path')
const fs = require('fs')

const args = process.argv.slice(2);
const from = args[0]
const to = args[1]

let file = to
console.log(file)
if (fs.existsSync(file)) {
  try{
    fs.rmSync(file)
  }
  catch{}
}

let fd = fs.openSync(file, 'w')
let dest = from

function writeSync(buf, start) {
  fs.writeSync(fd, buf, 0, buf.length, start)
}

function writeInt32(number, start) {
  let buf = Buffer.alloc(4)
  buf.writeInt32BE(number, 0)
  writeSync(buf, start)
}

// 加入子文件夹的文件
const files = fs.readdirSync(dest, { recursive: true }).filter(e => fs.statSync(path.join(dest, e)).isFile())
// console.log(JSON.stringify(files, null, 4))

// 文件数
let totalCount = files.length

let buf = Buffer.alloc(4)
buf.writeInt32BE(totalCount, 0)
writeSync(buf, 14)

let start = 18
// 12 + /name.length
let dataOffset = start
for (let file of files) {
  let name = `/${file}`
  let buf = Buffer.from(name, 'utf8')
  dataOffset = dataOffset + 12 + buf.length
}

for (let file of files) {
  let nb = Buffer.from(`/${file}`, 'utf8')
  // write filename byte length
  writeInt32(nb.length, start)
  start += 4
  // write filename
  writeSync(nb, start)
  start += nb.length
  // write offset
  writeInt32(dataOffset, start)
  start += 4
  // write length
  // console.info('dest:', dest, 'file:', file)
  let contentBuf = fs.readFileSync(path.join(dest, file))
  writeInt32(contentBuf.length, start)
  start += 4
  // write content
  writeSync(contentBuf, dataOffset)
  dataOffset += contentBuf.length
}

fs.closeSync(fd)