read-floats.js

const fs = require("fs")
const buf = fs.readFileSync("/dev/stdin")

if (buf.length !== 20) {
  console.log(`${+new Date()};error;error;error`)
  process.exit()
}

const offset = 8
const dataByteSize = 12
const dataSize = dataByteSize / 4
const arbuf = new ArrayBuffer(dataByteSize)
const intView = new Int32Array(arbuf)
const floatView = new Float32Array(arbuf)

for (let i = 0; i < dataSize; ++i) {
  intView[i] =
    buf[offset + i * 4 + 0] << 24 |
    buf[offset + i * 4 + 1] << 16 |
    buf[offset + i * 4 + 2] << 8 |
    buf[offset + i * 4 + 3] << 0
}
let result = ""
result += +new Date()
for (let i = 0; i < dataSize; ++i) {
  result += `;${floatView[i]}`
}
console.log(result)