@shockpkg/core/esm/package.mjs

shockpkg core

import { createInflateRaw as zlibCreateInflateRaw } from 'node:zlib';
/**
 * Package object.
 */
export class Package {
  /**
   * Package name.
   */

  /**
   * File name.
   */

  /**
   * File size.
   */

  /**
   * SHA256 hash of file.
   */

  /**
   * SHA1 hash of file.
   */

  /**
   * MD5 hash of file.
   */

  /**
   * Source path, URL for root, file path for child packages.
   */

  /**
   * Zipped info if a child package or null if a root package.
   */

  /**
   * Child packages.
   */

  /**
   * The parent package this package is found in.
   */

  /**
   * Package constructor.
   *
   * @param info Package info.
   * @param parent Package parent.
   */
  constructor(info, parent = null) {
    const {
      zipped
    } = info;
    if (parent && !zipped) {
      throw new Error(`Missing zipped info: ${info.name}`);
    } else if (!parent && zipped) {
      throw new Error(`Unexpected zipped info: ${info.name}`);
    }
    this.name = info.name;
    this.file = info.file;
    this.size = info.size;
    this.sha256 = info.sha256;
    this.sha1 = info.sha1;
    this.md5 = info.md5;
    this.source = info.source;
    this.zipped = zipped || null;
    this.parent = parent;
    this.packages = this._createPackages(info.packages);
  }

  /**
   * Get zipped compression method.
   *
   * @returns Compression method.
   */
  getZippedCompression() {
    const {
      zipped
    } = this;
    if (!zipped) {
      throw new Error('Not a child package');
    }
    return +zipped.split('-')[0];
  }

  /**
   * Get zipped data slice.
   *
   * @returns Data start and size.
   */
  getZippedSlice() {
    const {
      zipped
    } = this;
    if (!zipped) {
      throw new Error('Not a child package');
    }
    const parts = zipped.split('-');
    return [+parts[1], +parts[2]];
  }

  /**
   * Get zipped data decompressor.
   *
   * @returns Transform stream or null if entry not compressed.
   */
  getZippedDecompressor() {
    const method = this.getZippedCompression();
    switch (method) {
      case 0:
        {
          return null;
        }
      case 8:
        {
          return zlibCreateInflateRaw();
        }
      default:
        {
          // Do nothing.
        }
    }
    throw new Error(`Unsupported zipped compression: ${method}`);
  }

  /**
   * Create child packages list.
   *
   * @param infos Package infos.
   * @returns Package instance.
   */
  _createPackages(infos = []) {
    return infos.map(info => this._createPackage(info));
  }

  /**
   * Create a child package.
   *
   * @param info Package info.
   * @returns Package instance.
   */
  _createPackage(info) {
    const Constructor = this.constructor;
    return new Constructor(info, this);
  }
}
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