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The `Blob` object is an immutable data buffer. This is a first step towards alignment with the `Blob` Web API. Signed-off-by: James M Snell <jasnell@gmail.com> PR-URL: #36811 Backport-PR-URL: #39704 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,240 @@ | ||
| 'use strict'; | ||
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|
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| const { | ||
| ArrayFrom, | ||
| ObjectSetPrototypeOf, | ||
| Promise, | ||
| PromiseResolve, | ||
| RegExpPrototypeTest, | ||
| StringPrototypeToLowerCase, | ||
| Symbol, | ||
| SymbolIterator, | ||
| Uint8Array, | ||
| } = primordials; | ||
|
|
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| const { | ||
| createBlob, | ||
| FixedSizeBlobCopyJob, | ||
| } = internalBinding('buffer'); | ||
|
|
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| const { TextDecoder } = require('internal/encoding'); | ||
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| const { | ||
| JSTransferable, | ||
| kClone, | ||
| kDeserialize, | ||
| } = require('internal/worker/js_transferable'); | ||
|
|
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| const { | ||
| isAnyArrayBuffer, | ||
| isArrayBufferView, | ||
| } = require('internal/util/types'); | ||
|
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| const { | ||
| customInspectSymbol: kInspect, | ||
| emitExperimentalWarning, | ||
| } = require('internal/util'); | ||
| const { inspect } = require('internal/util/inspect'); | ||
|
|
||
| const { | ||
| AbortError, | ||
| codes: { | ||
| ERR_INVALID_ARG_TYPE, | ||
| ERR_BUFFER_TOO_LARGE, | ||
| ERR_OUT_OF_RANGE, | ||
| } | ||
| } = require('internal/errors'); | ||
|
|
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| const { | ||
| validateObject, | ||
| validateString, | ||
| validateUint32, | ||
| isUint32, | ||
| } = require('internal/validators'); | ||
|
|
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| const kHandle = Symbol('kHandle'); | ||
| const kType = Symbol('kType'); | ||
| const kLength = Symbol('kLength'); | ||
|
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| let Buffer; | ||
|
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| function deferred() { | ||
| let res, rej; | ||
| const promise = new Promise((resolve, reject) => { | ||
| res = resolve; | ||
| rej = reject; | ||
| }); | ||
| return { promise, resolve: res, reject: rej }; | ||
| } | ||
|
|
||
| function lazyBuffer() { | ||
| if (Buffer === undefined) | ||
| Buffer = require('buffer').Buffer; | ||
| return Buffer; | ||
| } | ||
|
|
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| function isBlob(object) { | ||
| return object?.[kHandle] !== undefined; | ||
| } | ||
|
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| function getSource(source, encoding) { | ||
| if (isBlob(source)) | ||
| return [source.size, source[kHandle]]; | ||
|
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| if (typeof source === 'string') { | ||
| source = lazyBuffer().from(source, encoding); | ||
| } else if (isAnyArrayBuffer(source)) { | ||
| source = new Uint8Array(source); | ||
| } else if (!isArrayBufferView(source)) { | ||
| throw new ERR_INVALID_ARG_TYPE( | ||
| 'source', | ||
| [ | ||
| 'string', | ||
| 'ArrayBuffer', | ||
| 'SharedArrayBuffer', | ||
| 'Buffer', | ||
| 'TypedArray', | ||
| 'DataView' | ||
| ], | ||
| source); | ||
| } | ||
|
|
||
| // We copy into a new Uint8Array because the underlying | ||
| // BackingStores are going to be detached and owned by | ||
| // the Blob. We also don't want to have to worry about | ||
| // byte offsets. | ||
| source = new Uint8Array(source); | ||
| return [source.byteLength, source]; | ||
| } | ||
|
|
||
| class InternalBlob extends JSTransferable { | ||
| constructor(handle, length, type = '') { | ||
| super(); | ||
| this[kHandle] = handle; | ||
| this[kType] = type; | ||
| this[kLength] = length; | ||
| } | ||
| } | ||
|
|
||
| class Blob extends JSTransferable { | ||
| constructor(sources = [], options) { | ||
| emitExperimentalWarning('buffer.Blob'); | ||
| if (sources === null || | ||
| typeof sources[SymbolIterator] !== 'function' || | ||
| typeof sources === 'string') { | ||
| throw new ERR_INVALID_ARG_TYPE('sources', 'Iterable', sources); | ||
| } | ||
| if (options !== undefined) | ||
| validateObject(options, 'options'); | ||
| const { | ||
| encoding = 'utf8', | ||
| type = '', | ||
| } = { ...options }; | ||
|
|
||
| let length = 0; | ||
| const sources_ = ArrayFrom(sources, (source) => { | ||
| const { 0: len, 1: src } = getSource(source, encoding); | ||
| length += len; | ||
| return src; | ||
| }); | ||
|
|
||
| // This is a MIME media type but we're not actively checking the syntax. | ||
| // But, to be fair, neither does Chrome. | ||
| validateString(type, 'options.type'); | ||
|
|
||
| if (!isUint32(length)) | ||
| throw new ERR_BUFFER_TOO_LARGE(0xFFFFFFFF); | ||
|
|
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| super(); | ||
| this[kHandle] = createBlob(sources_, length); | ||
| this[kLength] = length; | ||
| this[kType] = RegExpPrototypeTest(/[^\u{0020}-\u{007E}]/u, type) ? | ||
| '' : StringPrototypeToLowerCase(type); | ||
| } | ||
|
|
||
| [kInspect](depth, options) { | ||
| if (depth < 0) | ||
| return this; | ||
|
|
||
| const opts = { | ||
| ...options, | ||
| depth: options.depth == null ? null : options.depth - 1 | ||
| }; | ||
|
|
||
| return `Blob ${inspect({ | ||
| size: this.size, | ||
| type: this.type, | ||
| }, opts)}`; | ||
| } | ||
|
|
||
| [kClone]() { | ||
| const handle = this[kHandle]; | ||
| const type = this[kType]; | ||
| const length = this[kLength]; | ||
| return { | ||
| data: { handle, type, length }, | ||
| deserializeInfo: 'internal/blob:InternalBlob' | ||
| }; | ||
| } | ||
|
|
||
| [kDeserialize]({ handle, type, length }) { | ||
| this[kHandle] = handle; | ||
| this[kType] = type; | ||
| this[kLength] = length; | ||
| } | ||
|
|
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| get type() { return this[kType]; } | ||
|
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| get size() { return this[kLength]; } | ||
|
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| slice(start = 0, end = (this[kLength]), type = this[kType]) { | ||
| validateUint32(start, 'start'); | ||
| if (end < 0) end = this[kLength] + end; | ||
| validateUint32(end, 'end'); | ||
| validateString(type, 'type'); | ||
| if (end < start) | ||
| throw new ERR_OUT_OF_RANGE('end', 'greater than start', end); | ||
| if (end > this[kLength]) | ||
| throw new ERR_OUT_OF_RANGE('end', 'less than or equal to length', end); | ||
| return new InternalBlob( | ||
| this[kHandle].slice(start, end), | ||
| end - start, type); | ||
| } | ||
|
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| async arrayBuffer() { | ||
| const job = new FixedSizeBlobCopyJob(this[kHandle]); | ||
|
|
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| const ret = job.run(); | ||
| if (ret !== undefined) | ||
| return PromiseResolve(ret); | ||
|
|
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| const { | ||
| promise, | ||
| resolve, | ||
| reject | ||
| } = deferred(); | ||
| job.ondone = (err, ab) => { | ||
| if (err !== undefined) | ||
| return reject(new AbortError()); | ||
| resolve(ab); | ||
| }; | ||
|
|
||
| return promise; | ||
| } | ||
|
|
||
| async text() { | ||
| const dec = new TextDecoder(); | ||
| return dec.decode(await this.arrayBuffer()); | ||
| } | ||
| } | ||
|
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| InternalBlob.prototype.constructor = Blob; | ||
| ObjectSetPrototypeOf( | ||
| InternalBlob.prototype, | ||
| Blob.prototype); | ||
|
|
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| module.exports = { | ||
| Blob, | ||
| InternalBlob, | ||
| isBlob, | ||
| }; |
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