36881e3770
In order to eventually get rid of SystemJS and start using native `import`s instead, we'll need to provide "complete" file identifiers since otherwise there'll be MIME type errors when attempting to use `import`.
135 lines
3.4 KiB
JavaScript
135 lines
3.4 KiB
JavaScript
/* Copyright 2019 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* eslint no-var: error */
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import { assert } from "../shared/util.js";
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/** @implements {IPDFStream} */
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class PDFWorkerStream {
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constructor(msgHandler) {
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this._msgHandler = msgHandler;
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this._contentLength = null;
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this._fullRequestReader = null;
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this._rangeRequestReaders = [];
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}
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getFullReader() {
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assert(!this._fullRequestReader);
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this._fullRequestReader = new PDFWorkerStreamReader(this._msgHandler);
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return this._fullRequestReader;
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}
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getRangeReader(begin, end) {
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const reader = new PDFWorkerStreamRangeReader(begin, end, this._msgHandler);
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this._rangeRequestReaders.push(reader);
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return reader;
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}
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cancelAllRequests(reason) {
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if (this._fullRequestReader) {
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this._fullRequestReader.cancel(reason);
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}
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const readers = this._rangeRequestReaders.slice(0);
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readers.forEach(function(reader) {
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reader.cancel(reason);
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});
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}
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}
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/** @implements {IPDFStreamReader} */
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class PDFWorkerStreamReader {
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constructor(msgHandler) {
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this._msgHandler = msgHandler;
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this.onProgress = null;
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this._contentLength = null;
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this._isRangeSupported = false;
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this._isStreamingSupported = false;
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const readableStream = this._msgHandler.sendWithStream("GetReader");
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this._reader = readableStream.getReader();
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this._headersReady = this._msgHandler
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.sendWithPromise("ReaderHeadersReady")
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.then(data => {
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this._isStreamingSupported = data.isStreamingSupported;
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this._isRangeSupported = data.isRangeSupported;
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this._contentLength = data.contentLength;
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});
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}
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get headersReady() {
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return this._headersReady;
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}
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get contentLength() {
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return this._contentLength;
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}
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get isStreamingSupported() {
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return this._isStreamingSupported;
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}
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get isRangeSupported() {
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return this._isRangeSupported;
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}
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async read() {
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const { value, done } = await this._reader.read();
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if (done) {
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return { value: undefined, done: true };
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}
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// `value` is wrapped into Uint8Array, we need to
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// unwrap it to ArrayBuffer for further processing.
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return { value: value.buffer, done: false };
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}
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cancel(reason) {
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this._reader.cancel(reason);
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}
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}
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/** @implements {IPDFStreamRangeReader} */
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class PDFWorkerStreamRangeReader {
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constructor(begin, end, msgHandler) {
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this._msgHandler = msgHandler;
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this.onProgress = null;
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const readableStream = this._msgHandler.sendWithStream("GetRangeReader", {
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begin,
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end,
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});
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this._reader = readableStream.getReader();
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}
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get isStreamingSupported() {
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return false;
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}
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async read() {
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const { value, done } = await this._reader.read();
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if (done) {
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return { value: undefined, done: true };
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}
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return { value: value.buffer, done: false };
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}
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cancel(reason) {
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this._reader.cancel(reason);
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}
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}
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export { PDFWorkerStream };
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