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//
// Zip.swift
// Zip
//
// Created by Roy Marmelstein on 13/12/2015.
// Copyright © 2015 Roy Marmelstein. All rights reserved.
//
import Foundation
import minizip
/// Zip error type
public enum ZipError: Error {
/// File not found
case fileNotFound
/// Unzip fail
case unzipFail
/// Zip fail
case zipFail
/// User readable description
public var description: String {
switch self {
case .fileNotFound: return NSLocalizedString("File not found.", comment: "")
case .unzipFail: return NSLocalizedString("Failed to unzip file.", comment: "")
case .zipFail: return NSLocalizedString("Failed to zip file.", comment: "")
}
}
}
public enum ZipCompression: Int {
case NoCompression
case BestSpeed
case DefaultCompression
case BestCompression
internal var minizipCompression: Int32 {
switch self {
case .NoCompression:
return Z_NO_COMPRESSION
case .BestSpeed:
return Z_BEST_SPEED
case .DefaultCompression:
return Z_DEFAULT_COMPRESSION
case .BestCompression:
return Z_BEST_COMPRESSION
}
}
}
/// Zip class
public class Zip {
/**
Set of vaild file extensions
*/
internal static var customFileExtensions: Set<String> = []
// MARK: Lifecycle
/**
Init
- returns: Zip object
*/
public init () {
}
// MARK: Unzip
/**
Unzip file
- parameter zipFilePath: Local file path of zipped file. NSURL.
- parameter destination: Local file path to unzip to. NSURL.
- parameter overwrite: Overwrite bool.
- parameter password: Optional password if file is protected.
- parameter progress: A progress closure called after unzipping each file in the archive. Double value betweem 0 and 1.
- throws: Error if unzipping fails or if fail is not found. Can be printed with a description variable.
- notes: Supports implicit progress composition
*/
public class func unzipFile(_ zipFilePath: URL, destination: URL, overwrite: Bool, password: String?, progress: ((_ progress: Double) -> ())?) throws {
// File manager
let fileManager = FileManager.default
// Check whether a zip file exists at path.
let path = zipFilePath.path
if fileManager.fileExists(atPath: path) == false || fileExtensionIsInvalid(zipFilePath.pathExtension) {
throw ZipError.fileNotFound
}
// Unzip set up
var ret: Int32 = 0
var crc_ret: Int32 = 0
let bufferSize: UInt32 = 4096
var buffer = Array<CUnsignedChar>(repeating: 0, count: Int(bufferSize))
// Progress handler set up
var totalSize: Double = 0.0
var currentPosition: Double = 0.0
let fileAttributes = try fileManager.attributesOfItem(atPath: path)
if let attributeFileSize = fileAttributes[FileAttributeKey.size] as? Double {
totalSize += attributeFileSize
}
let progressTracker = Progress(totalUnitCount: Int64(totalSize))
progressTracker.isCancellable = false
progressTracker.isPausable = false
progressTracker.kind = ProgressKind.file
// Begin unzipping
let zip = unzOpen64(path)
defer {
unzClose(zip)
}
if unzGoToFirstFile(zip) != UNZ_OK {
throw ZipError.unzipFail
}
repeat {
if let cPassword = password?.cString(using: String.Encoding.ascii) {
ret = unzOpenCurrentFilePassword(zip, cPassword)
}
else {
ret = unzOpenCurrentFile(zip);
}
if ret != UNZ_OK {
throw ZipError.unzipFail
}
var fileInfo = unz_file_info64()
memset(&fileInfo, 0, MemoryLayout<unz_file_info>.size)
ret = unzGetCurrentFileInfo64(zip, &fileInfo, nil, 0, nil, 0, nil, 0)
if ret != UNZ_OK {
unzCloseCurrentFile(zip)
throw ZipError.unzipFail
}
currentPosition += Double(fileInfo.compressed_size)
let fileNameSize = Int(fileInfo.size_filename) + 1
//let fileName = UnsafeMutablePointer<CChar>(allocatingCapacity: fileNameSize)
let fileName = UnsafeMutablePointer<CChar>.allocate(capacity: fileNameSize)
unzGetCurrentFileInfo64(zip, &fileInfo, fileName, UInt(fileNameSize), nil, 0, nil, 0)
fileName[Int(fileInfo.size_filename)] = 0
var pathString = String(cString: fileName)
guard pathString.characters.count > 0 else {
throw ZipError.unzipFail
}
var isDirectory = false
let fileInfoSizeFileName = Int(fileInfo.size_filename-1)
if (fileName[fileInfoSizeFileName] == "/".cString(using: String.Encoding.utf8)?.first || fileName[fileInfoSizeFileName] == "\\".cString(using: String.Encoding.utf8)?.first) {
isDirectory = true;
}
free(fileName)
if pathString.rangeOfCharacter(from: CharacterSet(charactersIn: "/\\")) != nil {
pathString = pathString.replacingOccurrences(of: "\\", with: "/")
}
let fullPath = destination.appendingPathComponent(pathString).path
let creationDate = Date()
let directoryAttributes = [FileAttributeKey.creationDate.rawValue : creationDate,
FileAttributeKey.modificationDate.rawValue : creationDate]
do {
if isDirectory {
try fileManager.createDirectory(atPath: fullPath, withIntermediateDirectories: true, attributes: directoryAttributes)
}
else {
let parentDirectory = (fullPath as NSString).deletingLastPathComponent
try fileManager.createDirectory(atPath: parentDirectory, withIntermediateDirectories: true, attributes: directoryAttributes)
}
} catch {}
if fileManager.fileExists(atPath: fullPath) && !isDirectory && !overwrite {
unzCloseCurrentFile(zip)
ret = unzGoToNextFile(zip)
}
var filePointer: UnsafeMutablePointer<FILE>?
filePointer = fopen(fullPath, "wb")
while filePointer != nil {
let readBytes = unzReadCurrentFile(zip, &buffer, bufferSize)
if readBytes > 0 {
fwrite(buffer, Int(readBytes), 1, filePointer)
}
else {
break
}
}
fclose(filePointer)
crc_ret = unzCloseCurrentFile(zip)
if crc_ret == UNZ_CRCERROR {
throw ZipError.unzipFail
}
ret = unzGoToNextFile(zip)
// Update progress handler
if let progressHandler = progress{
progressHandler((currentPosition/totalSize))
}
progressTracker.completedUnitCount = Int64(currentPosition)
} while (ret == UNZ_OK && ret != UNZ_END_OF_LIST_OF_FILE)
// Completed. Update progress handler.
if let progressHandler = progress{
progressHandler(1.0)
}
progressTracker.completedUnitCount = Int64(totalSize)
}
// MARK: Zip
/**
Zip files.
- parameter paths: Array of NSURL filepaths.
- parameter zipFilePath: Destination NSURL, should lead to a .zip filepath.
- parameter password: Password string. Optional.
- parameter compression: Compression strategy
- parameter progress: A progress closure called after unzipping each file in the archive. Double value betweem 0 and 1.
- throws: Error if zipping fails.
- notes: Supports implicit progress composition
*/
public class func zipFiles(paths: [URL], zipFilePath: URL, password: String?, compression: ZipCompression = .DefaultCompression, progress: ((_ progress: Double) -> ())?) throws {
// File manager
let fileManager = FileManager.default
// Check whether a zip file exists at path.
let destinationPath = zipFilePath.path
// Process zip paths
let processedPaths = ZipUtilities().processZipPaths(paths)
// Zip set up
let chunkSize: Int = 16384
// Progress handler set up
var currentPosition: Double = 0.0
var totalSize: Double = 0.0
// Get totalSize for progress handler
for path in processedPaths {
do {
let filePath = path.filePath()
let fileAttributes = try fileManager.attributesOfItem(atPath: filePath)
let fileSize = fileAttributes[FileAttributeKey.size] as? Double
if let fileSize = fileSize {
totalSize += fileSize
}
}
catch {}
}
let progressTracker = Progress(totalUnitCount: Int64(totalSize))
progressTracker.isCancellable = false
progressTracker.isPausable = false
progressTracker.kind = ProgressKind.file
// Begin Zipping
let zip = zipOpen(destinationPath, APPEND_STATUS_CREATE)
for path in processedPaths {
let filePath = path.filePath()
var isDirectory: ObjCBool = false
fileManager.fileExists(atPath: filePath, isDirectory: &isDirectory)
if !isDirectory.boolValue {
let input = fopen(filePath, "r")
if input == nil {
throw ZipError.zipFail
}
let fileName = path.fileName
var zipInfo: zip_fileinfo = zip_fileinfo(tmz_date: tm_zip(tm_sec: 0, tm_min: 0, tm_hour: 0, tm_mday: 0, tm_mon: 0, tm_year: 0), dosDate: 0, internal_fa: 0, external_fa: 0)
do {
let fileAttributes = try fileManager.attributesOfItem(atPath: filePath)
if let fileDate = fileAttributes[FileAttributeKey.modificationDate] as? Date {
let components = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: fileDate)
zipInfo.tmz_date.tm_sec = UInt32(components.second!)
zipInfo.tmz_date.tm_min = UInt32(components.minute!)
zipInfo.tmz_date.tm_hour = UInt32(components.hour!)
zipInfo.tmz_date.tm_mday = UInt32(components.day!)
zipInfo.tmz_date.tm_mon = UInt32(components.month!) - 1
zipInfo.tmz_date.tm_year = UInt32(components.year!)
}
if let fileSize = fileAttributes[FileAttributeKey.size] as? Double {
currentPosition += fileSize
}
}
catch {}
let buffer = malloc(chunkSize)
if let password = password, let fileName = fileName {
zipOpenNewFileInZip3(zip, fileName, &zipInfo, nil, 0, nil, 0, nil,Z_DEFLATED, compression.minizipCompression, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, password, 0)
}
else if let fileName = fileName {
zipOpenNewFileInZip3(zip, fileName, &zipInfo, nil, 0, nil, 0, nil,Z_DEFLATED, compression.minizipCompression, 0, -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, nil, 0)
}
else {
throw ZipError.zipFail
}
var length: Int = 0
while (feof(input) == 0) {
length = fread(buffer, 1, chunkSize, input)
zipWriteInFileInZip(zip, buffer, UInt32(length))
}
// Update progress handler
if let progressHandler = progress{
progressHandler((currentPosition/totalSize))
}
progressTracker.completedUnitCount = Int64(currentPosition)
zipCloseFileInZip(zip)
free(buffer)
fclose(input)
}
}
zipClose(zip, nil)
// Completed. Update progress handler.
if let progressHandler = progress{
progressHandler(1.0)
}
progressTracker.completedUnitCount = Int64(totalSize)
}
/**
Check if file extension is invalid.
- parameter fileExtension: A file extension.
- returns: false if the extension is a valid file extension, otherwise true.
*/
internal class func fileExtensionIsInvalid(_ fileExtension: String?) -> Bool {
guard let fileExtension = fileExtension else { return true }
return !isValidFileExtension(fileExtension)
}
/**
Add a file extension to the set of custom file extensions
- parameter fileExtension: A file extension.
*/
public class func addCustomFileExtension(_ fileExtension: String) {
customFileExtensions.insert(fileExtension)
}
/**
Remove a file extension from the set of custom file extensions
- parameter fileExtension: A file extension.
*/
public class func removeCustomFileExtension(_ fileExtension: String) {
customFileExtensions.remove(fileExtension)
}
/**
Check if a specific file extension is valid
- parameter fileExtension: A file extension.
- returns: true if the extension valid, otherwise false.
*/
public class func isValidFileExtension(_ fileExtension: String) -> Bool {
let validFileExtensions: Set<String> = customFileExtensions.union(["zip", "cbz"])
return validFileExtensions.contains(fileExtension)
}
}