<?php
namespace Vichan\Functions\Mime;


/**
 * @param string $mime Lowercase valid mime type.
 * @return ?string Vichan's preferred extension for the given mime type, if any.
 */
function mime_to_ext(string $mime): ?string {
	static $mime_to_ext = [
		'image/jpeg' => 'jpg',
		'image/png' => 'png',
		'image/gif' => 'gif',
		'image/webp' => 'webp',
		'image/bmp' => 'bmp',
		'image/avif' => 'avif'
	];
	return $mime_to_ext[$mime] ?? null;
}

/**
 * @param string $mime Lowercase extension.
 * @return ?string Vichan's preferred mime type for the given extensions, if any.
 */
function ext_to_mime(string $ext): ?string {
	static $ext_to_mime = [
		'jpg' => 'image/jpeg',
		'jpeg' => 'image/jpeg',
		'png' => 'image/png',
		'gif' => 'image/gif',
		'webp' => 'image/webp',
		'bmp' => 'image/bmp',
		'avif' => 'image/avif',
	];
	return $ext_to_mime[$ext] ?? null;
}