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262aeef3fa
The `BaseCMapReaderFactory`, `BaseStandardFontDataFactory`, and `BaseWasmFactory` classes are all very similar, and the only difference is really in their respective `fetch` methods. By have the worker-thread "compute" the complete `filename` it's possible to simplify the `BaseCMapReaderFactory.prototype.fetch` method, which will allow future improvements to all of these classes. A couple of things to note: - This code is unused, and it's not even bundled, in the Firefox PDF Viewer. - In browsers it's unused by default, and worker-thread fetching will always be used when possible since that's more efficient. *Please note:* For users that provide a custom `CMapReaderFactory` instance when calling `getDocument` this could be a breaking change, however it's unlikely that any such users exist. (The *internal* format of this data was changed previously in PR 18951, and there hasn't been a single question/complaint about it in well over a year.)
64 lines
1.8 KiB
JavaScript
64 lines
1.8 KiB
JavaScript
/* Copyright 2015 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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import { stringToBytes, unreachable } from "../shared/util.js";
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import { fetchData } from "./display_utils.js";
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class BaseCMapReaderFactory {
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constructor({ baseUrl = null }) {
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if (
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(typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) &&
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this.constructor === BaseCMapReaderFactory
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) {
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unreachable("Cannot initialize BaseCMapReaderFactory.");
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}
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this.baseUrl = baseUrl;
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}
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async fetch({ filename }) {
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if (!this.baseUrl) {
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throw new Error("Ensure that the `cMapUrl` API parameter is provided.");
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}
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const url = `${this.baseUrl}${filename}`;
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return this._fetch(url).catch(reason => {
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throw new Error(`Unable to load CMap data at: ${url}`);
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});
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}
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/**
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* @ignore
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* @returns {Promise<Uint8Array>}
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*/
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async _fetch(url) {
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unreachable("Abstract method `_fetch` called.");
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}
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}
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class DOMCMapReaderFactory extends BaseCMapReaderFactory {
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/**
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* @ignore
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*/
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async _fetch(url) {
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const data = await fetchData(
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url,
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/* type = */ url.endsWith(".bcmap") ? "bytes" : "text"
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);
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return data instanceof Uint8Array ? data : stringToBytes(data);
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}
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}
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export { BaseCMapReaderFactory, DOMCMapReaderFactory };
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