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#!/usr/bin/env node
// https://gist.github.com/chemzqm/9f2334ca201dc2fbc363fdd757aa2ed4
const path = require('path')
const fs = require('fs')
const { execSync } = require('child_process')
const args = process.argv.slice(2);
const from = args[0]
const to = args[1]
let file = to
console.log(file)
if (fs.existsSync(file)) {
execSync(`rm -rf ${file}`)
}
let fd = fs.openSync(file, 'w')
let dest = from
function writeSync(buf, start) {
fs.writeSync(fd, buf, 0, buf.length, start)
}
function writeInt32(number, start) {
let buf = Buffer.alloc(4)
buf.writeInt32BE(number, 0)
writeSync(buf, start)
}
let files = fs.readdirSync(dest)
let totalCount = files.length
let buf = Buffer.alloc(4)
buf.writeInt32BE(totalCount, 0)
writeSync(buf, 14)
let start = 18
// 12 + /name.length
let dataOffset = start
for (let file of files) {
let name = `/${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
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)
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