diff options
Diffstat (limited to 'node_modules/undici/lib/fileapi')
| -rw-r--r-- | node_modules/undici/lib/fileapi/encoding.js | 290 | ||||
| -rw-r--r-- | node_modules/undici/lib/fileapi/filereader.js | 344 | ||||
| -rw-r--r-- | node_modules/undici/lib/fileapi/progressevent.js | 78 | ||||
| -rw-r--r-- | node_modules/undici/lib/fileapi/symbols.js | 10 | ||||
| -rw-r--r-- | node_modules/undici/lib/fileapi/util.js | 392 |
5 files changed, 1114 insertions, 0 deletions
diff --git a/node_modules/undici/lib/fileapi/encoding.js b/node_modules/undici/lib/fileapi/encoding.js new file mode 100644 index 0000000..1d1d2b6 --- /dev/null +++ b/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/node_modules/undici/lib/fileapi/filereader.js b/node_modules/undici/lib/fileapi/filereader.js new file mode 100644 index 0000000..cd36a22 --- /dev/null +++ b/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/node_modules/undici/lib/fileapi/progressevent.js b/node_modules/undici/lib/fileapi/progressevent.js new file mode 100644 index 0000000..778cf22 --- /dev/null +++ b/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/node_modules/undici/lib/fileapi/symbols.js b/node_modules/undici/lib/fileapi/symbols.js new file mode 100644 index 0000000..dd11746 --- /dev/null +++ b/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/node_modules/undici/lib/fileapi/util.js b/node_modules/undici/lib/fileapi/util.js new file mode 100644 index 0000000..1d10899 --- /dev/null +++ b/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 +} |