mirror of
git://jb55.com/damus
synced 2024-10-01 17:30:44 +00:00
52 lines
1.3 KiB
Swift
52 lines
1.3 KiB
Swift
|
/*
|
||
|
* Copyright 2023 Google Inc. All rights reserved.
|
||
|
*
|
||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
* you may not use this file except in compliance with the License.
|
||
|
* You may obtain a copy of the License at
|
||
|
*
|
||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
*
|
||
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
* See the License for the specific language governing permissions and
|
||
|
* limitations under the License.
|
||
|
*/
|
||
|
|
||
|
#if !os(WASI)
|
||
|
import Foundation
|
||
|
#else
|
||
|
import SwiftOverlayShims
|
||
|
#endif
|
||
|
|
||
|
extension Int {
|
||
|
|
||
|
/// Moves the current int into the nearest power of two
|
||
|
///
|
||
|
/// This is used since the UnsafeMutableRawPointer will face issues when writing/reading
|
||
|
/// if the buffer alignment exceeds that actual size of the buffer
|
||
|
var convertToPowerofTwo: Int {
|
||
|
guard self > 0 else { return 1 }
|
||
|
var n = UOffset(self)
|
||
|
|
||
|
#if arch(arm) || arch(i386)
|
||
|
let max = UInt32(Int.max)
|
||
|
#else
|
||
|
let max = UInt32.max
|
||
|
#endif
|
||
|
|
||
|
n -= 1
|
||
|
n |= n >> 1
|
||
|
n |= n >> 2
|
||
|
n |= n >> 4
|
||
|
n |= n >> 8
|
||
|
n |= n >> 16
|
||
|
if n != max {
|
||
|
n += 1
|
||
|
}
|
||
|
|
||
|
return Int(n)
|
||
|
}
|
||
|
}
|