mirror of
https://github.com/whscullin/apple2js.git
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124 lines
3.4 KiB
TypeScript
124 lines
3.4 KiB
TypeScript
/* Copyright 2010-2019 Will Scullin <scullin@scullinsteel.com>
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation. No representations are made about the suitability of this
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* software for any purpose. It is provided ' as is' without express or
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* implied warranty.
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*/
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import { byte, memory, word } from './types';
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/*eslint no-console: 0*/
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const hex_digits = '0123456789ABCDEF';
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const bin_digits = '01';
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/** Returns a random byte. */
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export function garbage(): byte {
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return (Math.random() * 0x100) & 0xff;
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}
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export const testables = {
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garbage
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};
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/**
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* Returns an array or Uint8Array of `size` bytes filled as if the computer
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* was just powered on.
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*/
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export function allocMem(size: number) {
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const result = new Uint8Array(size);
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for (let idx = 0; idx < size; idx++) {
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result[idx] = (idx & 0x02) ? 0x00 : 0xff;
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}
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// Borrowed from AppleWin (https://github.com/AppleWin/AppleWin)
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for (let idx = 0; idx < size; idx += 0x200) {
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result[idx + 0x28] = garbage();
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result[idx + 0x29] = garbage();
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result[idx + 0x68] = garbage();
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result[idx + 0x69] = garbage();
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}
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return result;
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}
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/** Returns an array or Uint8Array of 256 * `pages` bytes. */
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export function allocMemPages(pages: number): memory {
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return allocMem(pages << 8);
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}
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/** Returns a new Uint8Array for the input array. */
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export function bytify(ary: number[]): memory {
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return new Uint8Array(ary);
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}
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/** Writes to the console. */
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export function debug(...args: any[]): void {
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console.log.apply(console, args);
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}
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/**
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* Returns a string of hex digits (all caps).
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* @param v the value to encode
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* @param n the number of nibbles. If `n` is missing, it is guessed from the value
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* of `v`. If `v` < 256, it is assumed to be 2 nibbles, otherwise 4.
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*/
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export function toHex(v: byte | word | number, n?: number) {
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if (!n) {
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n = v < 256 ? 2 : 4;
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}
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let result = '';
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for (let idx = 0; idx < n; idx++) {
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result = hex_digits[v & 0x0f] + result;
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v >>= 4;
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}
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return result;
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}
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/**
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* Returns a string of 8 binary digits.
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* @param v the value to encode
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*/
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export function toBinary(v: byte) {
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let result = '';
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for (let idx = 0; idx < 8; idx++) {
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result = bin_digits[v & 0x01] + result;
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v >>= 1;
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}
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return result;
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}
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/**
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* Returns the value of a query parameter or the empty string if it does not
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* exist.
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* @param name the parameter name. Note that `name` must not have any RegExp
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* meta-characters except '[' and ']' or it will fail.
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*/
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export function gup(name: string) {
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const params = new URLSearchParams(window.location.search);
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return params.get(name);
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}
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/** Returns the URL fragment. */
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export function hup() {
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const regex = new RegExp('#(.*)');
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const results = regex.exec(window.location.hash);
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if (!results)
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return '';
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else
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return results[1];
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}
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/** Packs a 32-bit integer into a string in little-endian order. */
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export function numToString(num: number) {
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let result = '';
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for (let idx = 0; idx < 4; idx++) {
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result += String.fromCharCode(num & 0xff);
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num >>= 8;
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}
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return result;
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}
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