✨ Add extract file feature

src/interfaces/ISsnFileEntry.ts

@@ -28,6 +28,10 @@ interface ISsnFileEntry {
   comprSize: number;
   /** Decryption keys needed to decrypt the file */
   decryptionKeys: [number, number, number] | undefined;
+  /** Number of the disk where the file is stored (0=.z01, 1=.z02 etc.) */
+  diskNumberStart: number;
+  /** Offset */
+  offset: number;
 }
 
 export default ISsnFileEntry;