mirror of
https://github.com/apple/swift-nio-extras.git
synced 2025-05-16 01:42:29 +08:00
3d14afbe3f
Motivation: The RSocket protocol uses a 24 bit length field Modifications: - add two new methods readInteger and writeInteger on ByteBuffer that support reading and writing integers of any size. - add a new case (.three) to ByteLength Result: LengthFieldBasedFrameDecoder & LengthFieldPrepender do now support a 24 bit length field Co-authored-by: Johannes Weiss <johannesweiss@apple.com>
68 lines
2.2 KiB
Swift
68 lines
2.2 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the SwiftNIO open source project
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//
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// Copyright (c) 2021 Apple Inc. and the SwiftNIO project authors
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// Licensed under Apache License v2.0
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//
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// See LICENSE.txt for license information
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// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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//===----------------------------------------------------------------------===//
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/// An struct to describe the length of a piece of data in bits
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public struct NIOLengthFieldBitLength {
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internal enum Backing {
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case bits8
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case bits16
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case bits24
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case bits32
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case bits64
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}
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internal let bitLength: Backing
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public static let oneByte = NIOLengthFieldBitLength(bitLength: .bits8)
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public static let twoBytes = NIOLengthFieldBitLength(bitLength: .bits16)
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public static let threeBytes = NIOLengthFieldBitLength(bitLength: .bits24)
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public static let fourBytes = NIOLengthFieldBitLength(bitLength: .bits32)
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public static let eightBytes = NIOLengthFieldBitLength(bitLength: .bits64)
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public static let eightBits = NIOLengthFieldBitLength(bitLength: .bits8)
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public static let sixteenBits = NIOLengthFieldBitLength(bitLength: .bits16)
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public static let twentyFourBits = NIOLengthFieldBitLength(bitLength: .bits24)
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public static let thirtyTwoBits = NIOLengthFieldBitLength(bitLength: .bits32)
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public static let sixtyFourBits = NIOLengthFieldBitLength(bitLength: .bits64)
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internal var length: Int {
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switch bitLength {
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case .bits8:
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return 1
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case .bits16:
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return 2
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case .bits24:
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return 3
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case .bits32:
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return 4
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case .bits64:
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return 8
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}
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}
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internal var max: UInt {
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switch bitLength {
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case .bits8:
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return UInt(UInt8.max)
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case .bits16:
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return UInt(UInt16.max)
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case .bits24:
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return (UInt(UInt16.max) << 8) &+ UInt(UInt8.max)
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case .bits32:
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return UInt(UInt32.max)
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case .bits64:
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return UInt(UInt64.max)
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}
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}
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}
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