Desktop/scripts/generate-fixtures.mjs

// Copyright 2022 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
// @ts-check
import fs from 'node:fs/promises';
import path from 'node:path';
import crypto from 'node:crypto';
import { execFileSync } from 'node:child_process';

const FIXTURES = path.join(import.meta.dirname, '..', 'fixtures');
const SIZE = 256 * 1024;

const original = crypto.randomBytes(SIZE);

const originalPath = path.join(FIXTURES, 'diff-original.bin');
await fs.writeFile(originalPath, original);

// Add a few broken bytes to help create useful blockmaps
for (let i = 0; i < 3; i += 1) {
  original[Math.floor(Math.random() * original.length)] = 0;
}

const modifiedPath = path.join(FIXTURES, 'diff-modified.bin');
await fs.writeFile(modifiedPath, original);

const appBuilder = path.join(
  import.meta.dirname,
  '..',
  'node_modules',
  'app-builder-bin',
  'mac',
  'app-builder_amd64'
);

for (const filePath of [originalPath, modifiedPath]) {
  console.log('Adding blockmap to', filePath);

  // Put blockmap into a separate file
  console.log(
    execFileSync(appBuilder, [
      'blockmap',
      '--input',
      filePath,
      '--output',
      `${filePath}.blockmap`,
    ]).toString()
  );
}