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[Foundation] Merge sequence initializer fast paths into one initializer

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This commit is contained in:
Philippe Hausler
2017-07-06 14:54:17 -07:00
parent 0957ca6eab
commit 56f509f059
2 changed files with 27 additions and 29 deletions
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47
stdlib/public/SDK/Foundation/Data.swift
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@@ -1085,35 +1085,26 @@ public struct Data : ReferenceConvertible, Equatable, Hashable, RandomAccessColl
// slightly faster paths for common sequences
public init<S: Sequence>(_ elements: S) where S.Iterator.Element == UInt8 {
let underestimatedCount = elements.underestimatedCount
self.init(count: underestimatedCount)
let (endIterator, _) = UnsafeMutableBufferPointer(start: _backing._bytes?.assumingMemoryBound(to: UInt8.self), count: underestimatedCount).initialize(from: elements)
var iter = endIterator
while let byte = iter.next() { self.append(byte) }
if elements is Array<UInt8> {
self.init(bytes: _identityCast(elements, to: Array<UInt8>.self))
} else if elements is ArraySlice<UInt8> {
self.init(bytes: _identityCast(elements, to: ArraySlice<UInt8>.self))
} else if elements is UnsafeBufferPointer<UInt8> {
self.init(buffer: _identityCast(elements, to: UnsafeBufferPointer<UInt8>.self))
} else if let buffer = elements as? UnsafeMutableBufferPointer<UInt8> {
self.init(buffer: buffer)
} else if let data = elements as? Data {
self.init(backing: data._backing.mutableCopy(data._sliceRange), range: 0..<data.count)
} else {
let underestimatedCount = elements.underestimatedCount
self.init(count: underestimatedCount)
let (endIterator, _) = UnsafeMutableBufferPointer(start: _backing._bytes?.assumingMemoryBound(to: UInt8.self), count: underestimatedCount).initialize(from: elements)
var iter = endIterator
while let byte = iter.next() { self.append(byte) }
}
}
public init(_ bytes: Array<UInt8>) {
self.init(bytes: bytes)
}
public init(_ bytes: ArraySlice<UInt8>) {
self.init(bytes: bytes)
}
public init(_ buffer: UnsafeBufferPointer<UInt8>) {
self.init(buffer: buffer)
}
public init(_ buffer: UnsafeMutableBufferPointer<UInt8>) {
self.init(buffer: buffer)
}
public init(_ data: Data) {
_sliceRange = 0..<data.count
_backing = data._backing.mutableCopy(data._sliceRange)
}
@_versioned
internal init(backing: _DataStorage, range: Range<Index>) {
_backing = backing