16-bit

16.js

// echo -en "\x01\x02\x03\x04\x05\x06hello world\x07\x08\x09\x10goodbye world\x11\x12\x13\x14\x15" > data

let fs = require('fs')
let file = process.argv.slice(2)[0]
let buffer = fs.readFileSync(file)

let lines = []

for (let i = 0; i < buffer.length; i += 16) {
  let block = buffer.slice(i, i + 16)
  let hexArray = []
  let chunks = []
  let arr = []

  for (let value of block) {
    let hex = value.toString(16).padStart(2, '0')
    hexArray.push(hex)
  }

  // make chunks of two bytes - [01, 02]
  for (let j = 0; j < hexArray.length; j += 2) {
    chunks.push(hexArray.slice(j, j + 2))
  }

  for (let chunk of chunks) {
    arr.push((parseInt(chunk[0], 16) << 8) | (parseInt(chunk[1], 16) << 0))
  }

  let string = arr.join(' ')
  lines.push(string)
}

let values = lines.join('\n')

console.log(values)

// Output
// 258 772 1286 26725 27756 28448 30575 29292
// 25607 2057 4199 28527 25698 31077 8311 28530
// 27748 4370 4884 5376