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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
extension NSData : DataProtocol {
@nonobjc
public var startIndex: Int { return 0 }
@nonobjc
public var endIndex: Int { return length }
@nonobjc
public func lastRange<D, R>(of data: D, in r: R) -> Range<Int>? where D : DataProtocol, R : RangeExpression, NSData.Index == R.Bound {
return Range<Int>(range(of: Data(data), options: .backwards, in: NSRange(r)))
}
@nonobjc
public func firstRange<D, R>(of data: D, in r: R) -> Range<Int>? where D : DataProtocol, R : RangeExpression, NSData.Index == R.Bound {
return Range<Int>(range(of: Data(data), in: NSRange(r)))
}
@nonobjc
public var regions: [Data] {
var datas = [Data]()
enumerateBytes { (ptr, range, stop) in
datas.append(Data(bytesNoCopy: UnsafeMutableRawPointer(mutating: ptr), count: range.length, deallocator: .custom({ (ptr: UnsafeMutableRawPointer, count: Int) -> Void in
withExtendedLifetime(self) { }
})))
}
return datas
}
@nonobjc
public subscript(position: Int) -> UInt8 {
var byte = UInt8(0)
var offset = position
enumerateBytes { (ptr, range, stop) in
offset -= range.lowerBound
if range.contains(position) {
byte = ptr.load(fromByteOffset: offset, as: UInt8.self)
stop.pointee = true
}
}
return byte
}
}
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