| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| import * as Common from '../../core/common/common.js'; |
| |
| import {ChunkedFileReader, type ChunkedReader} from './FileUtils.js'; |
| |
| export class TempFile { |
| #lastBlob: Blob|null; |
| constructor() { |
| this.#lastBlob = null; |
| } |
| |
| write(pieces: (string|Blob)[]): void { |
| if (this.#lastBlob) { |
| pieces.unshift(this.#lastBlob); |
| } |
| this.#lastBlob = new Blob(pieces, {type: 'text/plain'}); |
| } |
| |
| read(): Promise<string|null> { |
| return this.readRange(); |
| } |
| |
| size(): number { |
| return this.#lastBlob ? this.#lastBlob.size : 0; |
| } |
| |
| async readRange(startOffset?: number, endOffset?: number): Promise<string|null> { |
| if (!this.#lastBlob) { |
| Common.Console.Console.instance().error('Attempt to read a temp file that was never written'); |
| return ''; |
| } |
| const blob = typeof startOffset === 'number' || typeof endOffset === 'number' ? |
| this.#lastBlob.slice((startOffset as number), (endOffset as number)) : |
| this.#lastBlob; |
| |
| const reader = new FileReader(); |
| try { |
| await new Promise((resolve, reject) => { |
| reader.onloadend = resolve; |
| reader.onerror = reject; |
| reader.readAsText(blob); |
| }); |
| } catch (error) { |
| Common.Console.Console.instance().error('Failed to read from temp file: ' + error.message); |
| } |
| |
| return reader.result as string | null; |
| } |
| |
| async copyToOutputStream( |
| outputStream: Common.StringOutputStream.OutputStream, |
| progress?: ((arg0: ChunkedReader) => void)): Promise<DOMError|null> { |
| if (!this.#lastBlob) { |
| void outputStream.close(); |
| return null; |
| } |
| const reader = new ChunkedFileReader((this.#lastBlob as File), 10 * 1000 * 1000, progress); |
| return reader.read(outputStream).then(success => success ? null : reader.error()); |
| } |
| |
| remove(): void { |
| this.#lastBlob = null; |
| } |
| } |