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Rename NetSocket.CircularBuffer to CircularByteBuffer.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| import Foundation | ||
|
|
||
| final class CircularByteBuffer: CustomDebugStringConvertible { | ||
| var bytes: UnsafePointer<UInt8>? { | ||
| data.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) -> UnsafePointer<UInt8>? in | ||
| bytes.baseAddress?.assumingMemoryBound(to: UInt8.self).advanced(by: head) | ||
| } | ||
| } | ||
| var maxLength: Int { | ||
| min(count, capacity - head) | ||
| } | ||
| var debugDescription: String { | ||
| Mirror(reflecting: self).debugDescription | ||
| } | ||
| private var count: Int { | ||
| let value = tail - head | ||
| return value < 0 ? value + capacity : value | ||
| } | ||
| private var data: Data | ||
| private(set) var capacity: Int = 0 { | ||
| didSet { | ||
| logger.info("extends a buffer size from ", oldValue, " to ", capacity) | ||
| } | ||
| } | ||
| private var head: Int = 0 | ||
| private var tail: Int = 0 | ||
| private var locked: UnsafeMutablePointer<UInt32>? | ||
| private var lockedTail: Int = -1 | ||
| private let baseCapacity: Int | ||
|
|
||
| init(capacity: Int) { | ||
| self.capacity = capacity | ||
| baseCapacity = capacity | ||
| data = .init(repeating: 0, count: capacity) | ||
| } | ||
|
|
||
| @discardableResult | ||
| func append(_ data: Data, locked: UnsafeMutablePointer<UInt32>? = nil) -> Bool { | ||
| guard data.count + count < capacity else { | ||
| return resize(data) | ||
| } | ||
| let count = data.count | ||
| if self.locked == nil { | ||
| self.locked = locked | ||
| } | ||
| let length = min(count, capacity - tail) | ||
| return self.data.withUnsafeMutableBytes { (bytes: UnsafeMutableRawBufferPointer) -> Bool in | ||
| guard let pointer = bytes.baseAddress?.assumingMemoryBound(to: UInt8.self) else { | ||
| return false | ||
| } | ||
| data.copyBytes(to: pointer.advanced(by: tail), count: length) | ||
| if length < count { | ||
| tail = count - length | ||
| data.advanced(by: length).copyBytes(to: pointer, count: tail) | ||
| } else { | ||
| tail += count | ||
| } | ||
| if capacity == tail { | ||
| tail = 0 | ||
| } | ||
| if locked != nil { | ||
| lockedTail = tail | ||
| } | ||
| return true | ||
| } | ||
| } | ||
|
|
||
| func skip(_ count: Int) { | ||
| let length = min(count, capacity - head) | ||
| if length < count { | ||
| head = count - length | ||
| } else { | ||
| head += count | ||
| } | ||
| if capacity == head { | ||
| head = 0 | ||
| } | ||
| if let locked = locked, -1 < lockedTail && lockedTail <= head { | ||
| OSAtomicAnd32Barrier(0, locked) | ||
| lockedTail = -1 | ||
| } | ||
| } | ||
|
|
||
| func clear() { | ||
| head = 0 | ||
| tail = 0 | ||
| locked = nil | ||
| lockedTail = 0 | ||
| } | ||
|
|
||
| private func resize(_ data: Data) -> Bool { | ||
| if 0 < head { | ||
| let subdata = self.data.subdata(in: 0..<tail) | ||
| self.data.replaceSubrange(0..<capacity - head, with: self.data.advanced(by: head)) | ||
| self.data.replaceSubrange(capacity - head..<capacity - head + subdata.count, with: subdata) | ||
| tail = capacity - head + subdata.count | ||
| } | ||
| self.data.append(.init(count: baseCapacity)) | ||
| head = 0 | ||
| capacity = self.data.count | ||
| return append(data) | ||
| } | ||
| } |