🚧 Add preliminary patch downloader

src/interfaces/ISolidSimple.ts

@@ -0,0 +1,18 @@
+interface ISolidSimpleFile {
+  /** Name of this file, e.g. `assets_swtor_de_de_-1to0.z01`. */
+  name: string;
+  /** Length of this file in bytes. */
+  length: number;
+}
+
+/** Simplified format of the Bencoded metafile.solid file */
+export default interface ISolidSimple {
+  /** Date and time when this patch was created. */
+  created: Date;
+  /** List of files included with this patch (.zip, .z01, etc.) */
+  files: ISolidSimpleFile[];
+  /** Length of one piece in bytes, e.g. 4194304 for 4 MiB. */
+  pieceLength: number;
+  ///** Concatenated hashes of all pieces. */
+  //pieces: string;
+}

src/ssn/getPatch.ts

@@ -0,0 +1,21 @@
+import getUrlContents from '../cdn/getUrlContents';
+import { Product } from '../interfaces/ISettings';
+import extractFile from './extractFile';
+import getSolidpkg from './getSolidpkg';
+import readSsnFile from './readSsnFile';
+
+export default async function getPatch(product: Product, from: number, to: number) {
+  const solidPkg = await getSolidpkg(product, from, to);
+
+  const bufferArray = await Promise.all(solidPkg.files.map((file) => getUrlContents({ host: 'cdn-patch.swtor.com', path: `/patch/${product}/${product}_${from}to${to}/${file.name}` })));
+  const zipFile = bufferArray[bufferArray.length - 1];
+
+  const fileEntries = readSsnFile(zipFile);
+
+  //TODO: verify file entries
+
+  const dvArray = bufferArray.map((buffer) => new DataView(buffer));
+  fileEntries.map((entry) => extractFile(entry, dvArray) );
+
+  return fileEntries;
+}

src/ssn/getSolidpkg.ts

@@ -1,13 +1,14 @@
 import getUrlContents from '../cdn/getUrlContents';
 import { Product } from '../interfaces/ISettings';
 import ISolid from '../interfaces/ISolidFile';
+import ISolidSimple from '../interfaces/ISolidSimple';
 import verifyProductName from '../ssn/verifyProductName';
 import parseBencode from './bencodeParser';
 import extractFile from './extractFile';
 import readSsnFile from './readSsnFile';
 import verifySolidpkg from './verifySolidpkg';
 
-export default async function getSolidpkg(product: Product, from: number, to: number): Promise<any> {
+export default async function getSolidpkg(product: Product, from: number, to: number): Promise<ISolidSimple> {
   //Verify function arguments
   if (!verifyProductName(product)) {
     throw new Error(`"${product}" is not a valid product.`);