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6a02751
FoundationEssentials
adam-fowler 8622a6f
import Dispatch
adam-fowler 632482a
Merge branch 'main' into foundation-essentials
adam-fowler d1f332c
Include notice detailing code from swift-foundation
adam-fowler 254d66c
Use runtime beta 2
adam-fowler f41a5d7
Copyright 2025
adam-fowler c361d97
Merge branch 'main' into foundation-essentials
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the Hummingbird server framework project | ||
| // | ||
| // Copyright (c) 2021-2022 the Hummingbird authors | ||
| // Licensed under Apache License v2.0 | ||
| // | ||
| // See LICENSE.txt for license information | ||
| // See hummingbird/CONTRIBUTORS.txt for the list of Hummingbird authors | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
|
|
||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // This source file is part of the Swift.org open source project | ||
| // | ||
| // Copyright (c) 2023 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 | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
|
|
||
| struct OutputBuffer<T>: ~Copyable // ~Escapable | ||
| { | ||
| let start: UnsafeMutablePointer<T> | ||
| let capacity: Int | ||
| var initialized: Int = 0 | ||
|
|
||
| deinit { | ||
| // `self` always borrows memory, and it shouldn't have gotten here. | ||
| // Failing to use `relinquishBorrowedMemory()` is an error. | ||
| if initialized > 0 { | ||
| fatalError() | ||
| } | ||
| } | ||
|
|
||
| // precondition: pointer points to uninitialized memory for count elements | ||
| init(initializing: UnsafeMutablePointer<T>, capacity: Int) { | ||
| start = initializing | ||
| self.capacity = capacity | ||
| } | ||
| } | ||
|
|
||
| extension OutputBuffer { | ||
| mutating func appendElement(_ value: T) { | ||
| precondition(initialized < capacity, "Output buffer overflow") | ||
| start.advanced(by: initialized).initialize(to: value) | ||
| initialized &+= 1 | ||
| } | ||
|
|
||
| mutating func deinitializeLastElement() -> T? { | ||
| guard initialized > 0 else { return nil } | ||
| initialized &-= 1 | ||
| return start.advanced(by: initialized).move() | ||
| } | ||
| } | ||
|
|
||
| extension OutputBuffer { | ||
| mutating func deinitialize() { | ||
| let b = UnsafeMutableBufferPointer(start: start, count: initialized) | ||
| b.deinitialize() | ||
| initialized = 0 | ||
| } | ||
| } | ||
|
|
||
| extension OutputBuffer { | ||
| mutating func append<S>( | ||
| from elements: S | ||
| ) -> S.Iterator where S: Sequence, S.Element == T { | ||
| var iterator = elements.makeIterator() | ||
| append(from: &iterator) | ||
| return iterator | ||
| } | ||
|
|
||
| mutating func append( | ||
| from elements: inout some IteratorProtocol<T> | ||
| ) { | ||
| while initialized < capacity { | ||
| guard let element = elements.next() else { break } | ||
| start.advanced(by: initialized).initialize(to: element) | ||
| initialized &+= 1 | ||
| } | ||
| } | ||
|
|
||
| mutating func append( | ||
| fromContentsOf source: some Collection<T> | ||
| ) { | ||
| let count = source.withContiguousStorageIfAvailable { | ||
| guard let sourceAddress = $0.baseAddress, !$0.isEmpty else { | ||
| return 0 | ||
| } | ||
| let available = capacity &- initialized | ||
| precondition( | ||
| $0.count <= available, | ||
| "buffer cannot contain every element from source." | ||
| ) | ||
| let tail = start.advanced(by: initialized) | ||
| tail.initialize(from: sourceAddress, count: $0.count) | ||
| return $0.count | ||
| } | ||
| if let count { | ||
| initialized &+= count | ||
| return | ||
| } | ||
|
|
||
| let available = capacity &- initialized | ||
| let tail = start.advanced(by: initialized) | ||
| let suffix = UnsafeMutableBufferPointer(start: tail, count: available) | ||
| var (iterator, copied) = source._copyContents(initializing: suffix) | ||
| precondition( | ||
| iterator.next() == nil, | ||
| "buffer cannot contain every element from source." | ||
| ) | ||
| assert(initialized + copied <= capacity) | ||
| initialized &+= copied | ||
| } | ||
|
|
||
| mutating func moveAppend( | ||
| fromContentsOf source: UnsafeMutableBufferPointer<T> | ||
| ) { | ||
| guard let sourceAddress = source.baseAddress, !source.isEmpty else { | ||
| return | ||
| } | ||
| let available = capacity &- initialized | ||
| precondition( | ||
| source.count <= available, | ||
| "buffer cannot contain every element from source." | ||
| ) | ||
| let tail = start.advanced(by: initialized) | ||
| tail.moveInitialize(from: sourceAddress, count: source.count) | ||
| initialized &+= source.count | ||
| } | ||
|
|
||
| mutating func moveAppend( | ||
| fromContentsOf source: Slice<UnsafeMutableBufferPointer<T>> | ||
| ) { | ||
| moveAppend(fromContentsOf: UnsafeMutableBufferPointer(rebasing: source)) | ||
| } | ||
| } | ||
|
|
||
| extension OutputBuffer<UInt8> /* where T: BitwiseCopyable */ { | ||
|
|
||
| mutating func appendBytes<Value /*: BitwiseCopyable */>( | ||
| of value: borrowing Value, | ||
| as: Value.Type | ||
| ) { | ||
| precondition(_isPOD(Value.self)) | ||
| let (q, r) = MemoryLayout<Value>.stride.quotientAndRemainder( | ||
| dividingBy: MemoryLayout<T>.stride | ||
| ) | ||
| precondition( | ||
| r == 0, | ||
| "Stride of Value must be divisible by stride of Element" | ||
| ) | ||
| precondition( | ||
| (capacity &- initialized) >= q, | ||
| "buffer cannot contain every byte of value." | ||
| ) | ||
| let p = UnsafeMutableRawPointer(start.advanced(by: initialized)) | ||
| p.storeBytes(of: value, as: Value.self) | ||
| initialized &+= q | ||
| } | ||
| } | ||
|
|
||
| extension OutputBuffer { | ||
| consuming func relinquishBorrowedMemory() -> UnsafeMutableBufferPointer<T> { | ||
| let start = self.start | ||
| let initialized = self.initialized | ||
| discard self | ||
| return .init(start: start, count: initialized) | ||
| } | ||
| } | ||
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Licenses out of date