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#!/usr/bin/env node
// Extract core.wxvpkg of current folder to dest folder
/**
* 使用：
* 两个参数
* uppack.js from to
* from: pkg文件
* to: 目标文件夹
*/
const path = require('path')
const fs = require('fs')
const args = process.argv.slice(2);
const from = args[0]
const to = args[1]
let dest = to
fs.mkdirSync(dest, {recursive: true})
let file = from
let fd = fs.openSync(file, 'r')
// read buffer
function readSync(start, length) {
const n = Buffer.alloc(length);
fs.readSync(fd, n, 0, length, start)
return n
}
const totalCount = readSync(14, 4).readInt32BE(0)
console.log('totalCount', totalCount)
const map = {};
let n = 18;
for (let i = 0; i < totalCount; i++) {
const e = {};
// byte length of filename
const i = readSync(n, 4).readInt32BE(0);
n += 4;
e.name = readSync(n, i).toString();
n += i;
e.offset = readSync(n, 4).readInt32BE(0);
n += 4;
e.length = readSync(n, 4).readInt32BE(0);
n += 4;
map[e.name] = e
}
let created = []
for (let item of Object.values(map)) {
let dir = path.join(dest, path.dirname(item.name))
if (created.indexOf(dir) == -1) {
fs.mkdirSync(dir, {recursive: true})
created.push(dir)
}
let buf = readSync(item.offset, item.length)
let filepath = path.join(dest, item.name)
fs.writeFileSync(filepath, buf.toString('utf8'), 'utf8')
}
fs.closeSync(fd)
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