5 files changed, 1114 insertions, 0 deletions

diff --git a/g4f/Provider/npm/node_modules/undici/lib/fileapi/encoding.js b/g4f/Provider/npm/node_modules/undici/lib/fileapi/encoding.js
new file mode 100644
index 00000000..1d1d2b65
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/undici/lib/fileapi/encoding.js
@@ -0,0 +1,290 @@
+'use strict'
+
+/**
+ * @see https://encoding.spec.whatwg.org/#concept-encoding-get
+ * @param {string|undefined} label
+ */
+function getEncoding (label) {
+  if (!label) {
+    return 'failure'
+  }
+
+  // 1. Remove any leading and trailing ASCII whitespace from label.
+  // 2. If label is an ASCII case-insensitive match for any of the
+  //    labels listed in the table below, then return the
+  //    corresponding encoding; otherwise return failure.
+  switch (label.trim().toLowerCase()) {
+    case 'unicode-1-1-utf-8':
+    case 'unicode11utf8':
+    case 'unicode20utf8':
+    case 'utf-8':
+    case 'utf8':
+    case 'x-unicode20utf8':
+      return 'UTF-8'
+    case '866':
+    case 'cp866':
+    case 'csibm866':
+    case 'ibm866':
+      return 'IBM866'
+    case 'csisolatin2':
+    case 'iso-8859-2':
+    case 'iso-ir-101':
+    case 'iso8859-2':
+    case 'iso88592':
+    case 'iso_8859-2':
+    case 'iso_8859-2:1987':
+    case 'l2':
+    case 'latin2':
+      return 'ISO-8859-2'
+    case 'csisolatin3':
+    case 'iso-8859-3':
+    case 'iso-ir-109':
+    case 'iso8859-3':
+    case 'iso88593':
+    case 'iso_8859-3':
+    case 'iso_8859-3:1988':
+    case 'l3':
+    case 'latin3':
+      return 'ISO-8859-3'
+    case 'csisolatin4':
+    case 'iso-8859-4':
+    case 'iso-ir-110':
+    case 'iso8859-4':
+    case 'iso88594':
+    case 'iso_8859-4':
+    case 'iso_8859-4:1988':
+    case 'l4':
+    case 'latin4':
+      return 'ISO-8859-4'
+    case 'csisolatincyrillic':
+    case 'cyrillic':
+    case 'iso-8859-5':
+    case 'iso-ir-144':
+    case 'iso8859-5':
+    case 'iso88595':
+    case 'iso_8859-5':
+    case 'iso_8859-5:1988':
+      return 'ISO-8859-5'
+    case 'arabic':
+    case 'asmo-708':
+    case 'csiso88596e':
+    case 'csiso88596i':
+    case 'csisolatinarabic':
+    case 'ecma-114':
+    case 'iso-8859-6':
+    case 'iso-8859-6-e':
+    case 'iso-8859-6-i':
+    case 'iso-ir-127':
+    case 'iso8859-6':
+    case 'iso88596':
+    case 'iso_8859-6':
+    case 'iso_8859-6:1987':
+      return 'ISO-8859-6'
+    case 'csisolatingreek':
+    case 'ecma-118':
+    case 'elot_928':
+    case 'greek':
+    case 'greek8':
+    case 'iso-8859-7':
+    case 'iso-ir-126':
+    case 'iso8859-7':
+    case 'iso88597':
+    case 'iso_8859-7':
+    case 'iso_8859-7:1987':
+    case 'sun_eu_greek':
+      return 'ISO-8859-7'
+    case 'csiso88598e':
+    case 'csisolatinhebrew':
+    case 'hebrew':
+    case 'iso-8859-8':
+    case 'iso-8859-8-e':
+    case 'iso-ir-138':
+    case 'iso8859-8':
+    case 'iso88598':
+    case 'iso_8859-8':
+    case 'iso_8859-8:1988':
+    case 'visual':
+      return 'ISO-8859-8'
+    case 'csiso88598i':
+    case 'iso-8859-8-i':
+    case 'logical':
+      return 'ISO-8859-8-I'
+    case 'csisolatin6':
+    case 'iso-8859-10':
+    case 'iso-ir-157':
+    case 'iso8859-10':
+    case 'iso885910':
+    case 'l6':
+    case 'latin6':
+      return 'ISO-8859-10'
+    case 'iso-8859-13':
+    case 'iso8859-13':
+    case 'iso885913':
+      return 'ISO-8859-13'
+    case 'iso-8859-14':
+    case 'iso8859-14':
+    case 'iso885914':
+      return 'ISO-8859-14'
+    case 'csisolatin9':
+    case 'iso-8859-15':
+    case 'iso8859-15':
+    case 'iso885915':
+    case 'iso_8859-15':
+    case 'l9':
+      return 'ISO-8859-15'
+    case 'iso-8859-16':
+      return 'ISO-8859-16'
+    case 'cskoi8r':
+    case 'koi':
+    case 'koi8':
+    case 'koi8-r':
+    case 'koi8_r':
+      return 'KOI8-R'
+    case 'koi8-ru':
+    case 'koi8-u':
+      return 'KOI8-U'
+    case 'csmacintosh':
+    case 'mac':
+    case 'macintosh':
+    case 'x-mac-roman':
+      return 'macintosh'
+    case 'iso-8859-11':
+    case 'iso8859-11':
+    case 'iso885911':
+    case 'tis-620':
+    case 'windows-874':
+      return 'windows-874'
+    case 'cp1250':
+    case 'windows-1250':
+    case 'x-cp1250':
+      return 'windows-1250'
+    case 'cp1251':
+    case 'windows-1251':
+    case 'x-cp1251':
+      return 'windows-1251'
+    case 'ansi_x3.4-1968':
+    case 'ascii':
+    case 'cp1252':
+    case 'cp819':
+    case 'csisolatin1':
+    case 'ibm819':
+    case 'iso-8859-1':
+    case 'iso-ir-100':
+    case 'iso8859-1':
+    case 'iso88591':
+    case 'iso_8859-1':
+    case 'iso_8859-1:1987':
+    case 'l1':
+    case 'latin1':
+    case 'us-ascii':
+    case 'windows-1252':
+    case 'x-cp1252':
+      return 'windows-1252'
+    case 'cp1253':
+    case 'windows-1253':
+    case 'x-cp1253':
+      return 'windows-1253'
+    case 'cp1254':
+    case 'csisolatin5':
+    case 'iso-8859-9':
+    case 'iso-ir-148':
+    case 'iso8859-9':
+    case 'iso88599':
+    case 'iso_8859-9':
+    case 'iso_8859-9:1989':
+    case 'l5':
+    case 'latin5':
+    case 'windows-1254':
+    case 'x-cp1254':
+      return 'windows-1254'
+    case 'cp1255':
+    case 'windows-1255':
+    case 'x-cp1255':
+      return 'windows-1255'
+    case 'cp1256':
+    case 'windows-1256':
+    case 'x-cp1256':
+      return 'windows-1256'
+    case 'cp1257':
+    case 'windows-1257':
+    case 'x-cp1257':
+      return 'windows-1257'
+    case 'cp1258':
+    case 'windows-1258':
+    case 'x-cp1258':
+      return 'windows-1258'
+    case 'x-mac-cyrillic':
+    case 'x-mac-ukrainian':
+      return 'x-mac-cyrillic'
+    case 'chinese':
+    case 'csgb2312':
+    case 'csiso58gb231280':
+    case 'gb2312':
+    case 'gb_2312':
+    case 'gb_2312-80':
+    case 'gbk':
+    case 'iso-ir-58':
+    case 'x-gbk':
+      return 'GBK'
+    case 'gb18030':
+      return 'gb18030'
+    case 'big5':
+    case 'big5-hkscs':
+    case 'cn-big5':
+    case 'csbig5':
+    case 'x-x-big5':
+      return 'Big5'
+    case 'cseucpkdfmtjapanese':
+    case 'euc-jp':
+    case 'x-euc-jp':
+      return 'EUC-JP'
+    case 'csiso2022jp':
+    case 'iso-2022-jp':
+      return 'ISO-2022-JP'
+    case 'csshiftjis':
+    case 'ms932':
+    case 'ms_kanji':
+    case 'shift-jis':
+    case 'shift_jis':
+    case 'sjis':
+    case 'windows-31j':
+    case 'x-sjis':
+      return 'Shift_JIS'
+    case 'cseuckr':
+    case 'csksc56011987':
+    case 'euc-kr':
+    case 'iso-ir-149':
+    case 'korean':
+    case 'ks_c_5601-1987':
+    case 'ks_c_5601-1989':
+    case 'ksc5601':
+    case 'ksc_5601':
+    case 'windows-949':
+      return 'EUC-KR'
+    case 'csiso2022kr':
+    case 'hz-gb-2312':
+    case 'iso-2022-cn':
+    case 'iso-2022-cn-ext':
+    case 'iso-2022-kr':
+    case 'replacement':
+      return 'replacement'
+    case 'unicodefffe':
+    case 'utf-16be':
+      return 'UTF-16BE'
+    case 'csunicode':
+    case 'iso-10646-ucs-2':
+    case 'ucs-2':
+    case 'unicode':
+    case 'unicodefeff':
+    case 'utf-16':
+    case 'utf-16le':
+      return 'UTF-16LE'
+    case 'x-user-defined':
+      return 'x-user-defined'
+    default: return 'failure'
+  }
+}
+
+module.exports = {
+  getEncoding
+}
diff --git a/g4f/Provider/npm/node_modules/undici/lib/fileapi/filereader.js b/g4f/Provider/npm/node_modules/undici/lib/fileapi/filereader.js
new file mode 100644
index 00000000..cd36a22f
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/undici/lib/fileapi/filereader.js
@@ -0,0 +1,344 @@
+'use strict'
+
+const {
+  staticPropertyDescriptors,
+  readOperation,
+  fireAProgressEvent
+} = require('./util')
+const {
+  kState,
+  kError,
+  kResult,
+  kEvents,
+  kAborted
+} = require('./symbols')
+const { webidl } = require('../fetch/webidl')
+const { kEnumerableProperty } = require('../core/util')
+
+class FileReader extends EventTarget {
+  constructor () {
+    super()
+
+    this[kState] = 'empty'
+    this[kResult] = null
+    this[kError] = null
+    this[kEvents] = {
+      loadend: null,
+      error: null,
+      abort: null,
+      load: null,
+      progress: null,
+      loadstart: null
+    }
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dfn-readAsArrayBuffer
+   * @param {import('buffer').Blob} blob
+   */
+  readAsArrayBuffer (blob) {
+    webidl.brandCheck(this, FileReader)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsArrayBuffer' })
+
+    blob = webidl.converters.Blob(blob, { strict: false })
+
+    // The readAsArrayBuffer(blob) method, when invoked,
+    // must initiate a read operation for blob with ArrayBuffer.
+    readOperation(this, blob, 'ArrayBuffer')
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#readAsBinaryString
+   * @param {import('buffer').Blob} blob
+   */
+  readAsBinaryString (blob) {
+    webidl.brandCheck(this, FileReader)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsBinaryString' })
+
+    blob = webidl.converters.Blob(blob, { strict: false })
+
+    // The readAsBinaryString(blob) method, when invoked,
+    // must initiate a read operation for blob with BinaryString.
+    readOperation(this, blob, 'BinaryString')
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#readAsDataText
+   * @param {import('buffer').Blob} blob
+   * @param {string?} encoding
+   */
+  readAsText (blob, encoding = undefined) {
+    webidl.brandCheck(this, FileReader)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsText' })
+
+    blob = webidl.converters.Blob(blob, { strict: false })
+
+    if (encoding !== undefined) {
+      encoding = webidl.converters.DOMString(encoding)
+    }
+
+    // The readAsText(blob, encoding) method, when invoked,
+    // must initiate a read operation for blob with Text and encoding.
+    readOperation(this, blob, 'Text', encoding)
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dfn-readAsDataURL
+   * @param {import('buffer').Blob} blob
+   */
+  readAsDataURL (blob) {
+    webidl.brandCheck(this, FileReader)
+
+    webidl.argumentLengthCheck(arguments, 1, { header: 'FileReader.readAsDataURL' })
+
+    blob = webidl.converters.Blob(blob, { strict: false })
+
+    // The readAsDataURL(blob) method, when invoked, must
+    // initiate a read operation for blob with DataURL.
+    readOperation(this, blob, 'DataURL')
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dfn-abort
+   */
+  abort () {
+    // 1. If this's state is "empty" or if this's state is
+    //    "done" set this's result to null and terminate
+    //    this algorithm.
+    if (this[kState] === 'empty' || this[kState] === 'done') {
+      this[kResult] = null
+      return
+    }
+
+    // 2. If this's state is "loading" set this's state to
+    //    "done" and set this's result to null.
+    if (this[kState] === 'loading') {
+      this[kState] = 'done'
+      this[kResult] = null
+    }
+
+    // 3. If there are any tasks from this on the file reading
+    //    task source in an affiliated task queue, then remove
+    //    those tasks from that task queue.
+    this[kAborted] = true
+
+    // 4. Terminate the algorithm for the read method being processed.
+    // TODO
+
+    // 5. Fire a progress event called abort at this.
+    fireAProgressEvent('abort', this)
+
+    // 6. If this's state is not "loading", fire a progress
+    //    event called loadend at this.
+    if (this[kState] !== 'loading') {
+      fireAProgressEvent('loadend', this)
+    }
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dom-filereader-readystate
+   */
+  get readyState () {
+    webidl.brandCheck(this, FileReader)
+
+    switch (this[kState]) {
+      case 'empty': return this.EMPTY
+      case 'loading': return this.LOADING
+      case 'done': return this.DONE
+    }
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dom-filereader-result
+   */
+  get result () {
+    webidl.brandCheck(this, FileReader)
+
+    // The result attribute’s getter, when invoked, must return
+    // this's result.
+    return this[kResult]
+  }
+
+  /**
+   * @see https://w3c.github.io/FileAPI/#dom-filereader-error
+   */
+  get error () {
+    webidl.brandCheck(this, FileReader)
+
+    // The error attribute’s getter, when invoked, must return
+    // this's error.
+    return this[kError]
+  }
+
+  get onloadend () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].loadend
+  }
+
+  set onloadend (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].loadend) {
+      this.removeEventListener('loadend', this[kEvents].loadend)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].loadend = fn
+      this.addEventListener('loadend', fn)
+    } else {
+      this[kEvents].loadend = null
+    }
+  }
+
+  get onerror () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].error
+  }
+
+  set onerror (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].error) {
+      this.removeEventListener('error', this[kEvents].error)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].error = fn
+      this.addEventListener('error', fn)
+    } else {
+      this[kEvents].error = null
+    }
+  }
+
+  get onloadstart () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].loadstart
+  }
+
+  set onloadstart (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].loadstart) {
+      this.removeEventListener('loadstart', this[kEvents].loadstart)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].loadstart = fn
+      this.addEventListener('loadstart', fn)
+    } else {
+      this[kEvents].loadstart = null
+    }
+  }
+
+  get onprogress () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].progress
+  }
+
+  set onprogress (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].progress) {
+      this.removeEventListener('progress', this[kEvents].progress)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].progress = fn
+      this.addEventListener('progress', fn)
+    } else {
+      this[kEvents].progress = null
+    }
+  }
+
+  get onload () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].load
+  }
+
+  set onload (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].load) {
+      this.removeEventListener('load', this[kEvents].load)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].load = fn
+      this.addEventListener('load', fn)
+    } else {
+      this[kEvents].load = null
+    }
+  }
+
+  get onabort () {
+    webidl.brandCheck(this, FileReader)
+
+    return this[kEvents].abort
+  }
+
+  set onabort (fn) {
+    webidl.brandCheck(this, FileReader)
+
+    if (this[kEvents].abort) {
+      this.removeEventListener('abort', this[kEvents].abort)
+    }
+
+    if (typeof fn === 'function') {
+      this[kEvents].abort = fn
+      this.addEventListener('abort', fn)
+    } else {
+      this[kEvents].abort = null
+    }
+  }
+}
+
+// https://w3c.github.io/FileAPI/#dom-filereader-empty
+FileReader.EMPTY = FileReader.prototype.EMPTY = 0
+// https://w3c.github.io/FileAPI/#dom-filereader-loading
+FileReader.LOADING = FileReader.prototype.LOADING = 1
+// https://w3c.github.io/FileAPI/#dom-filereader-done
+FileReader.DONE = FileReader.prototype.DONE = 2
+
+Object.defineProperties(FileReader.prototype, {
+  EMPTY: staticPropertyDescriptors,
+  LOADING: staticPropertyDescriptors,
+  DONE: staticPropertyDescriptors,
+  readAsArrayBuffer: kEnumerableProperty,
+  readAsBinaryString: kEnumerableProperty,
+  readAsText: kEnumerableProperty,
+  readAsDataURL: kEnumerableProperty,
+  abort: kEnumerableProperty,
+  readyState: kEnumerableProperty,
+  result: kEnumerableProperty,
+  error: kEnumerableProperty,
+  onloadstart: kEnumerableProperty,
+  onprogress: kEnumerableProperty,
+  onload: kEnumerableProperty,
+  onabort: kEnumerableProperty,
+  onerror: kEnumerableProperty,
+  onloadend: kEnumerableProperty,
+  [Symbol.toStringTag]: {
+    value: 'FileReader',
+    writable: false,
+    enumerable: false,
+    configurable: true
+  }
+})
+
+Object.defineProperties(FileReader, {
+  EMPTY: staticPropertyDescriptors,
+  LOADING: staticPropertyDescriptors,
+  DONE: staticPropertyDescriptors
+})
+
+module.exports = {
+  FileReader
+}
diff --git a/g4f/Provider/npm/node_modules/undici/lib/fileapi/progressevent.js b/g4f/Provider/npm/node_modules/undici/lib/fileapi/progressevent.js
new file mode 100644
index 00000000..778cf224
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/undici/lib/fileapi/progressevent.js
@@ -0,0 +1,78 @@
+'use strict'
+
+const { webidl } = require('../fetch/webidl')
+
+const kState = Symbol('ProgressEvent state')
+
+/**
+ * @see https://xhr.spec.whatwg.org/#progressevent
+ */
+class ProgressEvent extends Event {
+  constructor (type, eventInitDict = {}) {
+    type = webidl.converters.DOMString(type)
+    eventInitDict = webidl.converters.ProgressEventInit(eventInitDict ?? {})
+
+    super(type, eventInitDict)
+
+    this[kState] = {
+      lengthComputable: eventInitDict.lengthComputable,
+      loaded: eventInitDict.loaded,
+      total: eventInitDict.total
+    }
+  }
+
+  get lengthComputable () {
+    webidl.brandCheck(this, ProgressEvent)
+
+    return this[kState].lengthComputable
+  }
+
+  get loaded () {
+    webidl.brandCheck(this, ProgressEvent)
+
+    return this[kState].loaded
+  }
+
+  get total () {
+    webidl.brandCheck(this, ProgressEvent)
+
+    return this[kState].total
+  }
+}
+
+webidl.converters.ProgressEventInit = webidl.dictionaryConverter([
+  {
+    key: 'lengthComputable',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'loaded',
+    converter: webidl.converters['unsigned long long'],
+    defaultValue: 0
+  },
+  {
+    key: 'total',
+    converter: webidl.converters['unsigned long long'],
+    defaultValue: 0
+  },
+  {
+    key: 'bubbles',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'cancelable',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  },
+  {
+    key: 'composed',
+    converter: webidl.converters.boolean,
+    defaultValue: false
+  }
+])
+
+module.exports = {
+  ProgressEvent
+}
diff --git a/g4f/Provider/npm/node_modules/undici/lib/fileapi/symbols.js b/g4f/Provider/npm/node_modules/undici/lib/fileapi/symbols.js
new file mode 100644
index 00000000..dd11746d
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/undici/lib/fileapi/symbols.js
@@ -0,0 +1,10 @@
+'use strict'
+
+module.exports = {
+  kState: Symbol('FileReader state'),
+  kResult: Symbol('FileReader result'),
+  kError: Symbol('FileReader error'),
+  kLastProgressEventFired: Symbol('FileReader last progress event fired timestamp'),
+  kEvents: Symbol('FileReader events'),
+  kAborted: Symbol('FileReader aborted')
+}
diff --git a/g4f/Provider/npm/node_modules/undici/lib/fileapi/util.js b/g4f/Provider/npm/node_modules/undici/lib/fileapi/util.js
new file mode 100644
index 00000000..1d10899c
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/undici/lib/fileapi/util.js
@@ -0,0 +1,392 @@
+'use strict'
+
+const {
+  kState,
+  kError,
+  kResult,
+  kAborted,
+  kLastProgressEventFired
+} = require('./symbols')
+const { ProgressEvent } = require('./progressevent')
+const { getEncoding } = require('./encoding')
+const { DOMException } = require('../fetch/constants')
+const { serializeAMimeType, parseMIMEType } = require('../fetch/dataURL')
+const { types } = require('util')
+const { StringDecoder } = require('string_decoder')
+const { btoa } = require('buffer')
+
+/** @type {PropertyDescriptor} */
+const staticPropertyDescriptors = {
+  enumerable: true,
+  writable: false,
+  configurable: false
+}
+
+/**
+ * @see https://w3c.github.io/FileAPI/#readOperation
+ * @param {import('./filereader').FileReader} fr
+ * @param {import('buffer').Blob} blob
+ * @param {string} type
+ * @param {string?} encodingName
+ */
+function readOperation (fr, blob, type, encodingName) {
+  // 1. If fr’s state is "loading", throw an InvalidStateError
+  //    DOMException.
+  if (fr[kState] === 'loading') {
+    throw new DOMException('Invalid state', 'InvalidStateError')
+  }
+
+  // 2. Set fr’s state to "loading".
+  fr[kState] = 'loading'
+
+  // 3. Set fr’s result to null.
+  fr[kResult] = null
+
+  // 4. Set fr’s error to null.
+  fr[kError] = null
+
+  // 5. Let stream be the result of calling get stream on blob.
+  /** @type {import('stream/web').ReadableStream} */
+  const stream = blob.stream()
+
+  // 6. Let reader be the result of getting a reader from stream.
+  const reader = stream.getReader()
+
+  // 7. Let bytes be an empty byte sequence.
+  /** @type {Uint8Array[]} */
+  const bytes = []
+
+  // 8. Let chunkPromise be the result of reading a chunk from
+  //    stream with reader.
+  let chunkPromise = reader.read()
+
+  // 9. Let isFirstChunk be true.
+  let isFirstChunk = true
+
+  // 10. In parallel, while true:
+  // Note: "In parallel" just means non-blocking
+  // Note 2: readOperation itself cannot be async as double
+  // reading the body would then reject the promise, instead
+  // of throwing an error.
+  ;(async () => {
+    while (!fr[kAborted]) {
+      // 1. Wait for chunkPromise to be fulfilled or rejected.
+      try {
+        const { done, value } = await chunkPromise
+
+        // 2. If chunkPromise is fulfilled, and isFirstChunk is
+        //    true, queue a task to fire a progress event called
+        //    loadstart at fr.
+        if (isFirstChunk && !fr[kAborted]) {
+          queueMicrotask(() => {
+            fireAProgressEvent('loadstart', fr)
+          })
+        }
+
+        // 3. Set isFirstChunk to false.
+        isFirstChunk = false
+
+        // 4. If chunkPromise is fulfilled with an object whose
+        //    done property is false and whose value property is
+        //    a Uint8Array object, run these steps:
+        if (!done && types.isUint8Array(value)) {
+          // 1. Let bs be the byte sequence represented by the
+          //    Uint8Array object.
+
+          // 2. Append bs to bytes.
+          bytes.push(value)
+
+          // 3. If roughly 50ms have passed since these steps
+          //    were last invoked, queue a task to fire a
+          //    progress event called progress at fr.
+          if (
+            (
+              fr[kLastProgressEventFired] === undefined ||
+              Date.now() - fr[kLastProgressEventFired] >= 50
+            ) &&
+            !fr[kAborted]
+          ) {
+            fr[kLastProgressEventFired] = Date.now()
+            queueMicrotask(() => {
+              fireAProgressEvent('progress', fr)
+            })
+          }
+
+          // 4. Set chunkPromise to the result of reading a
+          //    chunk from stream with reader.
+          chunkPromise = reader.read()
+        } else if (done) {
+          // 5. Otherwise, if chunkPromise is fulfilled with an
+          //    object whose done property is true, queue a task
+          //    to run the following steps and abort this algorithm:
+          queueMicrotask(() => {
+            // 1. Set fr’s state to "done".
+            fr[kState] = 'done'
+
+            // 2. Let result be the result of package data given
+            //    bytes, type, blob’s type, and encodingName.
+            try {
+              const result = packageData(bytes, type, blob.type, encodingName)
+
+              // 4. Else:
+
+              if (fr[kAborted]) {
+                return
+              }
+
+              // 1. Set fr’s result to result.
+              fr[kResult] = result
+
+              // 2. Fire a progress event called load at the fr.
+              fireAProgressEvent('load', fr)
+            } catch (error) {
+              // 3. If package data threw an exception error:
+
+              // 1. Set fr’s error to error.
+              fr[kError] = error
+
+              // 2. Fire a progress event called error at fr.
+              fireAProgressEvent('error', fr)
+            }
+
+            // 5. If fr’s state is not "loading", fire a progress
+            //    event called loadend at the fr.
+            if (fr[kState] !== 'loading') {
+              fireAProgressEvent('loadend', fr)
+            }
+          })
+
+          break
+        }
+      } catch (error) {
+        if (fr[kAborted]) {
+          return
+        }
+
+        // 6. Otherwise, if chunkPromise is rejected with an
+        //    error error, queue a task to run the following
+        //    steps and abort this algorithm:
+        queueMicrotask(() => {
+          // 1. Set fr’s state to "done".
+          fr[kState] = 'done'
+
+          // 2. Set fr’s error to error.
+          fr[kError] = error
+
+          // 3. Fire a progress event called error at fr.
+          fireAProgressEvent('error', fr)
+
+          // 4. If fr’s state is not "loading", fire a progress
+          //    event called loadend at fr.
+          if (fr[kState] !== 'loading') {
+            fireAProgressEvent('loadend', fr)
+          }
+        })
+
+        break
+      }
+    }
+  })()
+}
+
+/**
+ * @see https://w3c.github.io/FileAPI/#fire-a-progress-event
+ * @see https://dom.spec.whatwg.org/#concept-event-fire
+ * @param {string} e The name of the event
+ * @param {import('./filereader').FileReader} reader
+ */
+function fireAProgressEvent (e, reader) {
+  // The progress event e does not bubble. e.bubbles must be false
+  // The progress event e is NOT cancelable. e.cancelable must be false
+  const event = new ProgressEvent(e, {
+    bubbles: false,
+    cancelable: false
+  })
+
+  reader.dispatchEvent(event)
+}
+
+/**
+ * @see https://w3c.github.io/FileAPI/#blob-package-data
+ * @param {Uint8Array[]} bytes
+ * @param {string} type
+ * @param {string?} mimeType
+ * @param {string?} encodingName
+ */
+function packageData (bytes, type, mimeType, encodingName) {
+  // 1. A Blob has an associated package data algorithm, given
+  //    bytes, a type, a optional mimeType, and a optional
+  //    encodingName, which switches on type and runs the
+  //    associated steps:
+
+  switch (type) {
+    case 'DataURL': {
+      // 1. Return bytes as a DataURL [RFC2397] subject to
+      //    the considerations below:
+      //  * Use mimeType as part of the Data URL if it is
+      //    available in keeping with the Data URL
+      //    specification [RFC2397].
+      //  * If mimeType is not available return a Data URL
+      //    without a media-type. [RFC2397].
+
+      // https://datatracker.ietf.org/doc/html/rfc2397#section-3
+      // dataurl    := "data:" [ mediatype ] [ ";base64" ] "," data
+      // mediatype  := [ type "/" subtype ] *( ";" parameter )
+      // data       := *urlchar
+      // parameter  := attribute "=" value
+      let dataURL = 'data:'
+
+      const parsed = parseMIMEType(mimeType || 'application/octet-stream')
+
+      if (parsed !== 'failure') {
+        dataURL += serializeAMimeType(parsed)
+      }
+
+      dataURL += ';base64,'
+
+      const decoder = new StringDecoder('latin1')
+
+      for (const chunk of bytes) {
+        dataURL += btoa(decoder.write(chunk))
+      }
+
+      dataURL += btoa(decoder.end())
+
+      return dataURL
+    }
+    case 'Text': {
+      // 1. Let encoding be failure
+      let encoding = 'failure'
+
+      // 2. If the encodingName is present, set encoding to the
+      //    result of getting an encoding from encodingName.
+      if (encodingName) {
+        encoding = getEncoding(encodingName)
+      }
+
+      // 3. If encoding is failure, and mimeType is present:
+      if (encoding === 'failure' && mimeType) {
+        // 1. Let type be the result of parse a MIME type
+        //    given mimeType.
+        const type = parseMIMEType(mimeType)
+
+        // 2. If type is not failure, set encoding to the result
+        //    of getting an encoding from type’s parameters["charset"].
+        if (type !== 'failure') {
+          encoding = getEncoding(type.parameters.get('charset'))
+        }
+      }
+
+      // 4. If encoding is failure, then set encoding to UTF-8.
+      if (encoding === 'failure') {
+        encoding = 'UTF-8'
+      }
+
+      // 5. Decode bytes using fallback encoding encoding, and
+      //    return the result.
+      return decode(bytes, encoding)
+    }
+    case 'ArrayBuffer': {
+      // Return a new ArrayBuffer whose contents are bytes.
+      const sequence = combineByteSequences(bytes)
+
+      return sequence.buffer
+    }
+    case 'BinaryString': {
+      // Return bytes as a binary string, in which every byte
+      //  is represented by a code unit of equal value [0..255].
+      let binaryString = ''
+
+      const decoder = new StringDecoder('latin1')
+
+      for (const chunk of bytes) {
+        binaryString += decoder.write(chunk)
+      }
+
+      binaryString += decoder.end()
+
+      return binaryString
+    }
+  }
+}
+
+/**
+ * @see https://encoding.spec.whatwg.org/#decode
+ * @param {Uint8Array[]} ioQueue
+ * @param {string} encoding
+ */
+function decode (ioQueue, encoding) {
+  const bytes = combineByteSequences(ioQueue)
+
+  // 1. Let BOMEncoding be the result of BOM sniffing ioQueue.
+  const BOMEncoding = BOMSniffing(bytes)
+
+  let slice = 0
+
+  // 2. If BOMEncoding is non-null:
+  if (BOMEncoding !== null) {
+    // 1. Set encoding to BOMEncoding.
+    encoding = BOMEncoding
+
+    // 2. Read three bytes from ioQueue, if BOMEncoding is
+    //    UTF-8; otherwise read two bytes.
+    //    (Do nothing with those bytes.)
+    slice = BOMEncoding === 'UTF-8' ? 3 : 2
+  }
+
+  // 3. Process a queue with an instance of encoding’s
+  //    decoder, ioQueue, output, and "replacement".
+
+  // 4. Return output.
+
+  const sliced = bytes.slice(slice)
+  return new TextDecoder(encoding).decode(sliced)
+}
+
+/**
+ * @see https://encoding.spec.whatwg.org/#bom-sniff
+ * @param {Uint8Array} ioQueue
+ */
+function BOMSniffing (ioQueue) {
+  // 1. Let BOM be the result of peeking 3 bytes from ioQueue,
+  //    converted to a byte sequence.
+  const [a, b, c] = ioQueue
+
+  // 2. For each of the rows in the table below, starting with
+  //    the first one and going down, if BOM starts with the
+  //    bytes given in the first column, then return the
+  //    encoding given in the cell in the second column of that
+  //    row. Otherwise, return null.
+  if (a === 0xEF && b === 0xBB && c === 0xBF) {
+    return 'UTF-8'
+  } else if (a === 0xFE && b === 0xFF) {
+    return 'UTF-16BE'
+  } else if (a === 0xFF && b === 0xFE) {
+    return 'UTF-16LE'
+  }
+
+  return null
+}
+
+/**
+ * @param {Uint8Array[]} sequences
+ */
+function combineByteSequences (sequences) {
+  const size = sequences.reduce((a, b) => {
+    return a + b.byteLength
+  }, 0)
+
+  let offset = 0
+
+  return sequences.reduce((a, b) => {
+    a.set(b, offset)
+    offset += b.byteLength
+    return a
+  }, new Uint8Array(size))
+}
+
+module.exports = {
+  staticPropertyDescriptors,
+  readOperation,
+  fireAProgressEvent
+}