Swift Move file to Shared App Container reduces file size -


i attempting copy file bundled app shared app container. seems when use .write method drastically reduces file size , corrupts file. doing incorrectly in write method?

let sharedcontainerurl = nsfilemanager.defaultmanager().containerurlforsecurityapplicationgroupidentifier("group.com.sharedbasemap")! let fileurl = sharedcontainerurl.urlbyappendingpathcomponent("locallayer.tpk")     var tpkfile = nsbundle.mainbundle().pathforresource("locallayer", oftype: "tpk")     print(sizeforlocalfilepath(tpkfile!))    // returns 3694906     if !nsfilemanager.defaultmanager().fileexistsatpath(fileurl!.path!) {          {             try tpkfile!.write(fileurl!.path!)             print("file saved: \(fileurl)")      } catch {     print("error saving file")     }     } else {     print("file exists @ \(fileurl)")     }     print(sizeforlocalfilepath(fileurl!.path!))   // returns 102  func sizeforlocalfilepath(filepath:string) -> uint64 {     {         let fileattributes = try nsfilemanager.defaultmanager().attributesofitematpath(filepath)         if let filesize = fileattributes[nsfilesize]  {             return (filesize as! nsnumber).unsignedlonglongvalue         } else {             print("failed size attribute path: \(filepath)")         }     } catch {         print("failed file attributes local path: \(filepath) error: \(error)")     }     return 0 }


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