How to use RunLengthStream method in wpt

Best JavaScript code snippet using wpt

run_length_stream.js

Source:run_length_stream.js

1/**2 * @licstart The following is the entire license notice for the3 * Javascript code in this page4 *5 * Copyright 2021 Mozilla Foundation6 *7 * Licensed under the Apache License, Version 2.0 (the "License");8 * you may not use this file except in compliance with the License.9 * You may obtain a copy of the License at10 *11 *     http://www.apache.org/licenses/LICENSE-2.012 *13 * Unless required by applicable law or agreed to in writing, software14 * distributed under the License is distributed on an "AS IS" BASIS,15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.16 * See the License for the specific language governing permissions and17 * limitations under the License.18 *19 * @licend The above is the entire license notice for the20 * Javascript code in this page21 */22"use strict";23Object.defineProperty(exports, "__esModule", {24  value: true25});26exports.RunLengthStream = void 0;27var _decode_stream = require("./decode_stream.js");28class RunLengthStream extends _decode_stream.DecodeStream {29  constructor(str, maybeLength) {30    super(maybeLength);31    this.str = str;32    this.dict = str.dict;33  }34  readBlock() {35    const repeatHeader = this.str.getBytes(2);36    if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] === 128) {37      this.eof = true;38      return;39    }40    let buffer;41    let bufferLength = this.bufferLength;42    let n = repeatHeader[0];43    if (n < 128) {44      buffer = this.ensureBuffer(bufferLength + n + 1);45      buffer[bufferLength++] = repeatHeader[1];46      if (n > 0) {47        const source = this.str.getBytes(n);48        buffer.set(source, bufferLength);49        bufferLength += n;50      }51    } else {52      n = 257 - n;53      const b = repeatHeader[1];54      buffer = this.ensureBuffer(bufferLength + n + 1);55      for (let i = 0; i < n; i++) {56        buffer[bufferLength++] = b;57      }58    }59    this.bufferLength = bufferLength;60  }61}...

RunLengthStream.ts

Source:RunLengthStream.ts

1/*2 * Copyright 2012 Mozilla Foundation3 *4 * The RunLengthStream class contained in this file is a TypeScript port of the5 * JavaScript RunLengthStream class in Mozilla's pdf.js project, made available6 * under the Apache 2.0 open source license.7 */8import DecodeStream from 'src/core/streams/DecodeStream';9import { StreamType } from 'src/core/streams/Stream';10class RunLengthStream extends DecodeStream {11  private stream: StreamType;12  constructor(stream: StreamType, maybeLength?: number) {13    super(maybeLength);14    this.stream = stream;15  }16  protected readBlock() {17    // The repeatHeader has following format. The first byte defines type of run18    // and amount of bytes to repeat/copy: n = 0 through 127 - copy next n bytes19    // (in addition to the second byte from the header), n = 129 through 255 -20    // duplicate the second byte from the header (257 - n) times, n = 128 - end.21    const repeatHeader = this.stream.getBytes(2);22    if (!repeatHeader || repeatHeader.length < 2 || repeatHeader[0] === 128) {23      this.eof = true;24      return;25    }26    let buffer;27    let bufferLength = this.bufferLength;28    let n = repeatHeader[0];29    if (n < 128) {30      // copy n bytes31      buffer = this.ensureBuffer(bufferLength + n + 1);32      buffer[bufferLength++] = repeatHeader[1];33      if (n > 0) {34        const source = this.stream.getBytes(n);35        buffer.set(source, bufferLength);36        bufferLength += n;37      }38    } else {39      n = 257 - n;40      const b = repeatHeader[1];41      buffer = this.ensureBuffer(bufferLength + n + 1);42      for (let i = 0; i < n; i++) {43        buffer[bufferLength++] = b;44      }45    }46    this.bufferLength = bufferLength;47  }48}...

RunLengthStream.spec.ts

Source:RunLengthStream.spec.ts

...7  FILES.forEach((file) => {8    it(`can decode run length encoded data (${file})`, () => {9      const encoded = new Uint8Array(fs.readFileSync(`${DIR}/${file}.encoded`));10      const decoded = new Uint8Array(fs.readFileSync(`${DIR}/${file}.decoded`));11      const stream = new RunLengthStream(new Stream(encoded));12      expect(stream.decode()).toEqual(decoded);13    });14  });...

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