@shockpkg/dir-projector/lib/util.mjs

Package for creating Shockwave Director projectors

import zlib from 'zlib';
import { launchers } from "./launchers.mjs";
/**
 * Create return value once.
 *
 * @param create Create function.
 * @returns Returned value.
 */

export function once(create) {
  let called = false;
  let value;
  return () => {
    if (!called) {
      value = create();
      called = true;
    }

    return value;
  };
}
/**
 * Trim dot flash from head of path.
 *
 * @param path Path string.
 * @returns Trimmed path.
 */

export function trimDotSlash(path) {
  return path.replace(/^(\.\/)+/, '');
}
/**
 * Find path relative from base, if base matches.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns path, or null.
 */

export function pathRelativeBase(path, start, nocase = false) {
  const p = trimDotSlash(nocase ? path.toLowerCase() : path);
  const s = trimDotSlash(nocase ? start.toLowerCase() : start);

  if (p === s) {
    return '';
  }

  if (p.startsWith(`${s}/`)) {
    return path.substr(s.length + 1);
  }

  return null;
}
/**
 * Same as pathRelativeBase, but retuns true on a match, else false.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns true on match, else false.
 */

export function pathRelativeBaseMatch(path, start, nocase = false) {
  return pathRelativeBase(path, start, nocase) !== null;
}
/**
 * Trim a file extenion.
 *
 * @param path File path.
 * @param ext File extension.
 * @param nocase Match case-insensitive.
 * @returns Path without file extension.
 */

export function trimExtension(path, ext, nocase = false) {
  const p = nocase ? path.toLowerCase() : path;
  const e = nocase ? ext.toLowerCase() : ext;
  return p.endsWith(e) ? path.substr(0, p.length - e.length) : path;
}
/**
 * Get ArrayBuffer from Buffer.
 *
 * @param buffer Buffer instance.
 * @returns ArrayBuffer copy.
 */

export function bufferToArrayBuffer(buffer) {
  const {
    byteOffset,
    byteLength
  } = buffer;
  return buffer.buffer.slice(byteOffset, byteOffset + byteLength);
}
/**
 * Get launcher data for an ID.
 *
 * @param id Laucher ID.
 * @returns Launcher data.
 */

export async function launcher(id) {
  const b64 = launchers()[id];

  if (typeof b64 !== 'string') {
    throw new Error(`Invalid launcher id: ${id}`);
  }

  return new Promise((resolve, reject) => {
    zlib.inflateRaw(Buffer.from(b64, 'base64'), (err, data) => {
      if (err) {
        reject(err);
        return;
      }

      resolve(data);
    });
  });
}
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