mirror of
https://github.com/mozilla/pdf.js.git
synced 2025-04-19 06:38:07 +02:00
ac03d7054d
This commit removes the final callbacks in this code by switching to a promises-based interface, overall simplifying the code. Moreover, we document why we write to files on disk and modernize the code using e.g. template strings.
71 lines
2 KiB
JavaScript
71 lines
2 KiB
JavaScript
/*
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* Copyright 2014 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 fs from "fs";
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import os from "os";
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import path from "path";
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import { spawn } from "child_process";
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let ttxTaskId = Date.now();
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function runTtx(fontPath) {
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return new Promise((resolve, reject) => {
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const ttx = spawn("ttx", [fontPath], { stdio: "ignore" });
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ttx.on("error", () => {
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reject(
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new Error(
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"Unable to execute `ttx`; make sure the `fonttools` dependency is installed"
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)
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);
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});
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ttx.on("close", () => {
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resolve();
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});
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});
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}
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async function translateFont(content) {
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const buffer = Buffer.from(content, "base64");
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const taskId = (ttxTaskId++).toString();
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const fontPath = path.join(os.tmpdir(), `pdfjs-font-test-${taskId}.otf`);
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const resultPath = path.join(os.tmpdir(), `pdfjs-font-test-${taskId}.ttx`);
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// Write the font data to a temporary file on disk (because TTX only accepts
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// files as input).
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fs.writeFileSync(fontPath, buffer);
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// Run TTX on the temporary font file.
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let ttxError;
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try {
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await runTtx(fontPath);
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} catch (error) {
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ttxError = error;
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}
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// Remove the temporary font/result files and report on the outcome.
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fs.unlinkSync(fontPath);
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if (ttxError) {
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throw ttxError;
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}
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if (!fs.existsSync(resultPath)) {
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throw new Error("TTX did not generate output");
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}
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const xml = fs.readFileSync(resultPath);
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fs.unlinkSync(resultPath);
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return xml;
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}
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export { translateFont };
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