GuilhermeRossato

function getMimeTypeFromExtension(extension = "txt") {
    if (extension[0] === ".") {
        extension = extension.substr(1);
    }
    return {
        "aac": "audio/aac",
        "abw": "application/x-abiword",
        "arc": "application/x-freearc",
        "avi": "video/x-msvideo",
        "azw": "application/vnd.amazon.ebook",

GuilhermeRossato

/**
 * Returns a UTC-3 datetime string from a given date object
 * @param {Date} date The date to retrieve the string from (default current date)
 * @returns {'2021-07-29 23:37:25' | string} A string in the format  "yyyy/mm/dd hh:mm:ss"
 */
function getBrazilianDateTimeString(date = new Date()) {
    date.setTime(date.getTime() - 3 * 60 * 60 * 1000);
    return date.toISOString().replace("T", " ").split(".")[0];
}

GuilhermeRossato

<?php

function getBrazilStateFromZipCode($cep = '') {
	$cepNum = intval(preg_replace("/[^0-9]/", "", $cep));
	if ($cepNum >= 69900000 && $cepNum <= 69999999) {
		return "AC";
	} else if ($cepNum >= 57000000 && $cepNum <= 57999999) {
		return "AL";
	} else if ($cepNum >= 69000000 && $cepNum <= 69299999) {
		return "AM";

GuilhermeRossato

export function generateJSDocsFromObj(obj) {
	if (typeof obj !== "object") {
		return typeof obj;
	}
	if (obj instanceof Array) {
		if (obj.length <= 0) {
			return "any[]";
		} else {
			return generateJSDocsFromObj(obj[0]);
		}

GuilhermeRossato

// adapted from c++ on stackoverflow: https://stackoverflow.com/a/57210516/5974331

// opens a new console windows for the current process
// returns 1 on success
int CreateConsole() {
    if (!AllocConsole()) {
        return 0;
    }
    FILE *fDummy;
    freopen_s(&fDummy, "CONIN$", "r", stdin);

GuilhermeRossato

// Warning: undefined behaviour if the network interface does not have an IP (might fail or might return the next interface ip)

function getNetworkAdapterIp(adapter_name = "Adaptador de Rede sem Fio Wi-Fi", ip_version = 4, cp = require("child_process")) {
	process.stdout.setEncoding('utf-8');
	/** @type {Buffer} */
	const ipconfig_output = cp.spawnSync("C:\\Windows\\System32\\ipconfig.exe", ["/all"]).output[1];
	const adapter_config = ipconfig_output.toString("utf-8").split(adapter_name + ":")[1];
	if (!adapter_config) {
		return "ERROR - could not find adapter on output:\n" + (JSON.stringify(ipconfig_output.toString("utf-8")));
	} else {

GuilhermeRossato

const b = (i, j, k) => i + (j - i) * k;
const ib = (i, j, k) => (k - i) / (j - i);
// clamped (limit return to be between i and j parameters)
const _b = (i, j, k) => k < 0 ? i : (k > 1 ? j : i + (j - i) * k); 
const _ib = (i, j, k) => k < i ? 0 : (k > 1 ? j : (k - i) / (j - i));

/*
b(0, 1, 0) === 0
b(0, 1, 1) === 1
b(5, 10, 0.5) === 7.5

GuilhermeRossato

#include <stdio.h> // snprintf
#include <windows.h> // wchar

// Convert a WIDE CHAR ARRAY (wchar *) into a CHAR ARRAY (char *) in a memory safe way.
// Handles unicode characters by writing \uXXXX exactly like C compilers and JSON parsers.
int convert_wchar_array_to_char_array(const WCHAR * input, char * output, size_t output_buffer_size) {
    if (input == NULL || output == NULL || sizeof(WCHAR) != 2) {
        return 0;
    }
    if (output_buffer_size <= 0) {

GuilhermeRossato

2D Uint8 Tensor in C

A simple structure to hold 2d uint8 arrays in C that can be easily adjusted to hold other things in other dimensions.

Usage is as follows:

struct uint8_tensor * t = create_tensor(2, 2);
t->set(t, 0, 0, 0);
t->set(t, 0, 1, 1);

GuilhermeRossato

var sigmoid_lookup_size = 128;
var sigmoid_lookup = (new Float32Array(sigmoid_lookup_size+1)).map((a,i) => 1/(1+Math.exp(-(i-(sigmoid_lookup_size/2))/(sigmoid_lookup_size/32))));

function real_sigmoid(x) {
	return 1 / (1 + Math.exp(-x));
}

function cached_sigmoid(x) {
	if (x < -16) {