mirror of
https://github.com/tsolomko/SWCompression.git
synced 2026-06-23 14:56:41 +00:00
Timofey Solomko
112fa8bbb0
The only reason for it to be was to propagate optionality of UInt64 argument. Instead we can if-let ntfs timestamp and call this initializer with non-optional argument. We also now force-unwrap ntfsReferenceDate, since it is likely to be a system problem if we cannot create definetely correct date from its components.
60 lines
1.5 KiB
Swift
60 lines
1.5 KiB
Swift
// Copyright (c) 2018 Timofey Solomko
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// Licensed under MIT License
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//
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// See LICENSE for license information
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import Foundation
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extension UnsignedInteger {
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@inline(__always)
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func toInt() -> Int {
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return Int(truncatingIfNeeded: self)
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}
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}
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extension Int {
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@inline(__always)
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func toUInt8() -> UInt8 {
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return UInt8(truncatingIfNeeded: UInt(self))
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}
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@inline(__always)
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func roundTo512() -> Int {
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if self >= Int.max - 510 {
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return Int.max
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} else {
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return (self + 511) & (~511)
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}
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}
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/// Returns an integer with reversed order of bits.
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func reversed(bits count: Int) -> Int {
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var a = 1 << 0
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var b = 1 << (count - 1)
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var z = 0
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for i in Swift.stride(from: count - 1, to: -1, by: -2) {
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z |= (self >> i) & a
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z |= (self << i) & b
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a <<= 1
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b >>= 1
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}
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return z
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}
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}
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extension Date {
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private static let ntfsReferenceDate = DateComponents(calendar: Calendar(identifier: .iso8601),
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timeZone: TimeZone(abbreviation: "UTC"),
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year: 1601, month: 1, day: 1,
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hour: 0, minute: 0, second: 0).date!
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init(_ ntfsTime: UInt64) {
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self.init(timeInterval: TimeInterval(ntfsTime) / 10_000_000, since: .ntfsReferenceDate)
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}
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}
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