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// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
@_implementationOnly import CoreFoundation
internal final class _NSKeyedCoderOldStyleArray : NSObject, NSCopying, NSSecureCoding, NSCoding {
private var _addr : UnsafeMutableRawPointer // free if decoding
private var _count : Int
private var _size : Int
private var _type : _NSSimpleObjCType
private var _decoded : Bool = false
static func sizeForObjCType(_ type: _NSSimpleObjCType) -> Int? {
var size : Int = 0
var align : Int = 0
return _NSGetSizeAndAlignment(type, &size, &align) ? size : nil
}
// TODO: Why isn't `addr` passed as a mutable pointer?
init?(objCType type: _NSSimpleObjCType, count: Int, at addr: UnsafeRawPointer) {
self._addr = UnsafeMutableRawPointer(mutating: addr)
self._count = count
guard let size = _NSKeyedCoderOldStyleArray.sizeForObjCType(type) else {
return nil
}
self._size = size
self._type = type
self._decoded = false
}
deinit {
if self._decoded {
// Cannot deinitialize memory without knowing the element type.
self._addr.deallocate()
}
}
init?(coder aDecoder: NSCoder) {
assert(aDecoder.allowsKeyedCoding)
guard let type = _NSSimpleObjCType(UInt8(aDecoder.decodeInteger(forKey: "NS.type"))) else {
return nil
}
self._count = aDecoder.decodeInteger(forKey: "NS.count")
self._size = aDecoder.decodeInteger(forKey: "NS.size")
self._type = type
self._decoded = true
if self._size != _NSKeyedCoderOldStyleArray.sizeForObjCType(type) {
return nil
}
self._addr = UnsafeMutableRawPointer.allocate(byteCount: self._count * self._size, alignment: 1)
super.init()
for idx in 0..<self._count {
var type = Int8(self._type)
withUnsafePointer(to: &type) { typep in
let addr = self._addr.advanced(by: idx * self._size)
aDecoder.decodeValue(ofObjCType: typep, at: addr)
}
}
}
func encode(with aCoder: NSCoder) {
aCoder.encode(self._count, forKey: "NS.count")
aCoder.encode(self._size, forKey: "NS.size")
aCoder.encode(Int(self._type), forKey: "NS.type")
for idx in 0..<self._count {
var type = Int8(self._type)
withUnsafePointer(to: &type) { typep in
aCoder.encodeValue(ofObjCType: typep, at: self._addr + (idx * self._size))
}
}
}
static var supportsSecureCoding: Bool {
return true
}
func fillObjCType(_ type: _NSSimpleObjCType, count: Int, at addr: UnsafeMutableRawPointer) {
if type == self._type && count <= self._count {
addr.copyMemory(from: self._addr, byteCount: count * self._size)
}
}
override func copy() -> Any {
return copy(with: nil)
}
func copy(with zone: NSZone? = nil) -> Any {
return self
}
}
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