asp-smart-ui-plus-test/asp-mp/asp-mp-qrcode/gcanvas/env/tool.js

A Component Library for Vue 3

export function ArrayBufferToBase64 (buffer) {
  var binary = ''
  var bytes = new Uint8ClampedArray(buffer)
  for (var len = bytes.byteLength, i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i])
  }
  return btoa(binary)
}

export function Base64ToUint8ClampedArray (base64String) {
  const padding = '='.repeat((4 - base64String.length % 4) % 4)
  const base64 = (base64String + padding)
    .replace(/[-]/g, '+')
    .replace(/_/g, '/')

  const rawData = atob(base64)
  const outputArray = new Uint8ClampedArray(rawData.length)

  for (let i = 0; i < rawData.length; ++i) {
    outputArray[i] = rawData.charCodeAt(i)
  }
  return outputArray
}