Created
September 22, 2015 17:23
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Categories on NSURL and NSData to create a zip archive without any external dependencies
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public extension NSURL { | |
/// Creates a zip archive of the file/folder represented by this URL and returns a references to the zipped file | |
/// | |
/// - parameter dest: the destination URL; if nil, the destination will be this URL with ".zip" appended | |
func zip(dest: NSURL? = nil) throws -> NSURL { | |
let destURL = dest ?? self.URLByAppendingPathExtension("zip") | |
let fm = NSFileManager.defaultManager() | |
var isDir: ObjCBool = false | |
let srcDir: NSURL | |
let srcDirIsTemporary: Bool | |
if let path = self.path where self.fileURL && fm.fileExistsAtPath(path, isDirectory: &isDir) && isDir.boolValue == true { | |
// this URL is a directory: just zip it in-place | |
srcDir = self | |
srcDirIsTemporary = false | |
} else { | |
// otherwise we need to copy the simple file to a temporary directory in order for | |
// NSFileCoordinatorReadingOptions.ForUploading to actually zip it up | |
srcDir = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(NSUUID().UUIDString) | |
try fm.createDirectoryAtURL(srcDir, withIntermediateDirectories: true, attributes: nil) | |
let tmpURL = srcDir.URLByAppendingPathComponent(self.lastPathComponent ?? "file") | |
try fm.copyItemAtURL(self, toURL: tmpURL) | |
srcDirIsTemporary = true | |
} | |
let coord = NSFileCoordinator() | |
var error: NSError? | |
// coordinateReadingItemAtURL is invoked synchronously, but the passed in zippedURL is only valid | |
// for the duration of the block, so it needs to be copied out | |
coord.coordinateReadingItemAtURL(srcDir, options: NSFileCoordinatorReadingOptions.ForUploading, error: &error) { (zippedURL: NSURL) -> Void in | |
do { | |
try fm.copyItemAtURL(zippedURL, toURL: destURL) | |
} catch let err { | |
error = err as NSError | |
} | |
} | |
if srcDirIsTemporary { try fm.removeItemAtURL(srcDir) } | |
if let error = error { throw error } | |
return destURL | |
} | |
} | |
public extension NSData { | |
/// Creates a zip archive of this data via a temporary file and returns the zipped contents | |
func zip() throws -> NSData { | |
let tmpURL = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(NSUUID().UUIDString) | |
try self.writeToURL(tmpURL, options: NSDataWritingOptions.DataWritingAtomic) | |
let zipURL = try tmpURL.zip() | |
let fm = NSFileManager.defaultManager() | |
let zippedData = try NSData(contentsOfURL: zipURL, options: NSDataReadingOptions()) | |
try fm.removeItemAtURL(tmpURL) // clean up | |
try fm.removeItemAtURL(zipURL) | |
return zippedData | |
} | |
} | |
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