kc3-lang/brotli/js/cli.js

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• Hash : 68f1b90a
  Author :
  Date : 2021-08-18T19:15:07
  

  Update (#918)
  
  Prepare to use copybara worklow.

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• js/cli.js

• #!/usr/bin/env node
  
  let defaults =
      {input: 'input.br', output: 'output.txt', test_iters: 0, test_repeat: 100};
  
  /* Parse command line arguments. */
  let argv =
      require('yargs')
          .usage('Usage: $0 -i file -o file')
          .option(
              'input',
              {alias: 'i', default: defaults.input, describe: 'compressed file'})
          .option('output', {
            alias: 'o',
            default: defaults.output,
            describe: 'decompressed file'
          })
          .option('test_iters', {
            default: defaults.test_iters,
            describe: '# of times to run performance test'
          })
          .option('test_repeat', {
            default: defaults.test_repeat,
            describe: '# of times to decompress file in performance test'
          })
          .argv;
  
  /* Read input. */
  const fs = require('fs');
  data = fs.readFileSync(argv.input);
  if (!Buffer.isBuffer(data)) throw 'not a buffer';
  const bytes = new Uint8Array(data);
  
  /* Load and map brotli decoder module. */
  global.window = {};
  require('./decode.js')
  const brotliDecode = window['BrotliDecode'];
  
  /* Load "performance" module. */
  const {PerformanceObserver, performance} = require('perf_hooks');
  
  /* Performance test. */
  for (let i = 0; i < argv.test_iters; ++i) {
    const a = performance.now();
    let result;
    for (let j = 0; j < argv.test_repeat; ++j) {
      result = brotliDecode(bytes);
    }
    const b = performance.now();
    const total_length = argv.test_repeat * result.length / (1024 * 1024);
    const total_time = (b - a) / 1000;
  
    console.log(
        total_length + 'MB / ' + total_time +
        's = ' + (total_length / total_time) + 'MB/s');
  }
  
  /* Decode and write output file. */
  fs.writeFileSync(argv.output, new Buffer(brotliDecode(bytes)));
  

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