iahu

import FFT from "fft.js";

const getColumns = (d: number[][], cs: number[]) => {
  const res: number[] = [];
  for (let i = 0; i < d.length; ++i) {
    const r = d[i];
    res.push(...cs.map((x) => r[x]));
  }
  return res;
};

iahu

# Taken from https://github.com/OAI/OpenAPI-Specification/blob/main/examples/v3.0/petstore.yaml

    openapi: "3.0.0"
    info:
      version: 1.0.0
      title: Swagger Petstore
      license:
        name: MIT
    servers:
      - url: https://petstore.swagger.io/v1

iahu

export const getImageData = (image: HTMLImageElement) => {
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
  const width = image.width;
  const height = image.height;

  if (width === 0 || height === 0) throw new Error('image dimensions cannot be zero');

  canvas.width = width;
  canvas.height = height;

iahu

/**
 * Returns SHA-256 hash from supplied message.
 *
 * @param   {String} message.
 * @returns {String} hash as hex string.
 *
 * @example
 *   sha256('abc').then(hash => console.log(hash));
 *   const hash = await sha256('abc');
 */

iahu

import fs from 'fs'
import glob from 'glob'
import cliProgress from 'cli-progress'
import getThemeColor from './main'
import ProHub from './prohub'

const [path] = process.argv.slice(2)
const bar = new cliProgress.SingleBar({}, cliProgress.Presets.shades_classic)

glob(path, function (err, matches) {

iahu

描述	扩展名	Magic Number
Adobe Illustrator	.ai	25 50 44 46 [%PDF]
Bitmap graphic	.bmp	42 4D [BM]
Class File	.class	CA FE BA BE
JPEG graphic file	.jpg	FF D8
JPEG 2000 graphic file	.jp2	0000000C6A5020200D0A [....jP..]

iahu

描述	扩展名	Magic Number
Adobe Illustrator	.ai	25 50 44 46 [%PDF]
Bitmap graphic	.bmp	42 4D [BM]
Class File	.class	CA FE BA BE
JPEG graphic file	.jpg	FF D8
JPEG 2000 graphic file	.jp2	0

iahu

type Job<T> = () => Promise<T>
export const promiseThrottle = async <T>(
  jobs: Job<T>[],
  parallelCount: number,
  onParallelDone?: (results: T[], index: number) => void
): Promise<T[]> => {
  if (!(jobs && Array.isArray(jobs))) {
    return Promise.reject('jobs must be Array')
  }

iahu

import * as crypto from 'crypto'

const HMAC_ALGORITHM = 'HmacSHA1'
const ekey = Buffer.from('9527')
const ikey = Buffer.from('2840')

const mergeBytes = (...args: Uint8Array[]) => {
  return Buffer.concat(args)
}

iahu

Installing CYGWIN with SSH
  1) Download cygwin setup.exe from http://www.cygwin.com
    - Execute setup.exe
    - Install from internet
    - Root directory: `c:\cygwin` + all users
    - Local package directory: use default value
   - Select a mirror to download files from
   - Select these packages:
     - editors > xemacs 21.4.22-1
     - net > openssh 6.1-p