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Viewing file:     index.js (1.33 KB)      -rw-r--r--

'use strict'

module.exports = function encodeUtf8 (input) {
  var result = []
  var size = input.length

  for (var index = 0; index < size; index++) {
    var point = input.charCodeAt(index)

    if (point >= 0xD800 && point <= 0xDBFF && size > index + 1) {
      var second = input.charCodeAt(index + 1)

      if (second >= 0xDC00 && second <= 0xDFFF) {
        // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
        point = (point - 0xD800) * 0x400 + second - 0xDC00 + 0x10000
        index += 1
      }
    }

    // US-ASCII
    if (point < 0x80) {
      result.push(point)
      continue
    }

    // 2-byte UTF-8
    if (point < 0x800) {
      result.push((point >> 6) | 192)
      result.push((point & 63) | 128)
      continue
    }

    // 3-byte UTF-8
    if (point < 0xD800 || (point >= 0xE000 && point < 0x10000)) {
      result.push((point >> 12) | 224)
      result.push(((point >> 6) & 63) | 128)
      result.push((point & 63) | 128)
      continue
    }

    // 4-byte UTF-8
    if (point >= 0x10000 && point <= 0x10FFFF) {
      result.push((point >> 18) | 240)
      result.push(((point >> 12) & 63) | 128)
      result.push(((point >> 6) & 63) | 128)
      result.push((point & 63) | 128)
      continue
    }

    // Invalid character
    result.push(0xEF, 0xBF, 0xBD)
  }

  return new Uint8Array(result).buffer
}