51 lines
2.1 KiB
JavaScript
51 lines
2.1 KiB
JavaScript
"use strict";
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/**
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* @license
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* Copyright 2019 Palantir Technologies, Inc.
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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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Object.defineProperty(exports, "__esModule", { value: true });
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exports.tryReadFile = void 0;
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var tslib_1 = require("tslib");
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var fs = require("fs");
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var error_1 = require("../error");
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/** Read a file, but return undefined if it is an MPEG '.ts' file. */
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function tryReadFile(filename, logger) {
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return tslib_1.__awaiter(this, void 0, void 0, function () {
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var buffer, fd;
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return tslib_1.__generator(this, function (_a) {
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if (!fs.existsSync(filename)) {
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throw new error_1.FatalError("Unable to open file: " + filename);
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}
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buffer = Buffer.allocUnsafe(256);
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fd = fs.openSync(filename, "r");
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try {
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fs.readSync(fd, buffer, 0, 256, 0);
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if (buffer.readInt8(0) === 0x47 && buffer.readInt8(188) === 0x47) {
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// MPEG transport streams use the '.ts' file extension. They use 0x47 as the frame
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// separator, repeating every 188 bytes. It is unlikely to find that pattern in
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// TypeScript source, so tslint ignores files with the specific pattern.
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logger.error(filename + ": ignoring MPEG transport stream\n");
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return [2 /*return*/, undefined];
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}
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}
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finally {
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fs.closeSync(fd);
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}
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return [2 /*return*/, fs.readFileSync(filename, "utf8")];
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});
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});
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}
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exports.tryReadFile = tryReadFile;
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