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Merge pull request #1932 from GoogleChrome/bg-sync-array-buffer
Bg sync array buffer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| Copyright 2018 Google LLC | ||
| Use of this source code is governed by an MIT-style | ||
| license that can be found in the LICENSE file or at | ||
| https://opensource.org/licenses/MIT. | ||
| */ | ||
|
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| const Blob = require('./Blob'); | ||
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| // https://developers.google.com/web/updates/2012/06/How-to-convert-ArrayBuffer-to-and-from-String | ||
| // Note, the original post uses Uint16Array and allocates 2 bytes per character | ||
| // but native implementations of methods that convert strings to ArrayBuffers | ||
| // don't do that for ASCII strings, so we'll stick to str.length and only use | ||
| // ASCII in tests until we switch our test infrastructure to run in real | ||
| // browsers. | ||
| function ab2str(buf) { | ||
| return String.fromCharCode.apply(null, new Uint8Array(buf)); | ||
| } | ||
|
|
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| function str2ab(str) { | ||
| const buf = new ArrayBuffer(str.length); | ||
| const bufView = new Uint8Array(buf); | ||
| for (let i = 0, strLen = str.length; i < strLen; i++) { | ||
| bufView[i] = str.charCodeAt(i); | ||
| } | ||
| return buf; | ||
| } | ||
|
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| // https://fetch.spec.whatwg.org/#body | ||
| class Body { | ||
| async arrayBuffer() { | ||
| if (this.bodyUsed) { | ||
| throw new TypeError('Already read'); | ||
| } else { | ||
| this.bodyUsed = true; | ||
|
|
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| if (typeof this._body === 'undefined') { | ||
| return new ArrayBuffer(); | ||
| } | ||
| if (typeof this._body === 'string') { | ||
| return str2ab(this._body); | ||
| } | ||
| if (this._body instanceof ArrayBuffer) { | ||
| return this._body; | ||
| } | ||
| if (this._body instanceof Blob) { | ||
| // `_text` is non-standard, but easier for the mocks. | ||
| return str2ab(this._body._text); | ||
| } | ||
| } | ||
| } | ||
|
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| async blob() { | ||
| if (this.bodyUsed) { | ||
| throw new TypeError('Already read'); | ||
| } else { | ||
| this.bodyUsed = true; | ||
|
|
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| if (typeof this._body === 'undefined') { | ||
| return new Blob(); | ||
| } | ||
| if (typeof this._body === 'string') { | ||
| return new Blob([this._body]); | ||
| } | ||
| if (this._body instanceof ArrayBuffer) { | ||
| // `_text` is non-standard, but easier for the mocks. | ||
| return new Blob([ab2str(this._body)]); | ||
| } | ||
| if (this._body instanceof Blob) { | ||
| return this._body; | ||
| } | ||
| } | ||
| } | ||
|
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| async text() { | ||
| if (this.bodyUsed) { | ||
| throw new TypeError('Already read'); | ||
| } else { | ||
| this.bodyUsed = true; | ||
|
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| if (typeof this._body === 'undefined') { | ||
| return new ''; | ||
| } | ||
| if (typeof this._body === 'string') { | ||
| return this._body; | ||
| } | ||
| if (this._body instanceof ArrayBuffer) { | ||
| return ab2str(this._body); | ||
| } | ||
| if (this._body instanceof Blob) { | ||
| // `_text` is non-standard, but easier for the mocks. | ||
| return this._body._text; | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
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| module.exports = Body; |
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