A fast, safe, and efficient CBOR serialization library for Swift on any platform.
swiftpackageindex.com/thecoolwinter/CBOR/1.1.1/documentation/cbor
khanwinter.com
atproto
swift
cbor
Experimental Float16 Support
+14
-10
Sources/CBOR/Encoder/Containers/SingleValueCBOREncodingContainer.swift
+14
-10
Sources/CBOR/Encoder/Containers/SingleValueCBOREncodingContainer.swift
···
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// I hate this conditional cast, but Swift forces us to do this because Codable can't implement a specialized
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// function for any type, only the standard library types. This is the same method Foundation uses to detect
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// special encoding cases. It's still lame.
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-
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if let date = value as? Date {
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+
switch value {
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case let value as Date:
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switch options.dateEncodingStrategy {
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case .string:
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-
parent.register(StringDateOptimizer(value: date))
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parent.register(StringDateOptimizer(value: value))
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case .float:
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parent.register(EpochFloatDateOptimizer(value: date))
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parent.register(EpochFloatDateOptimizer(value: value))
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case .double:
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parent.register(EpochDoubleDateOptimizer(value: date))
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parent.register(EpochDoubleDateOptimizer(value: value))
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}
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-
} else if let uuid = value as? UUID {
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-
parent.register(UUIDOptimizer(value: uuid))
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-
} else if let data = value as? Data {
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parent.register(ByteStringOptimizer(value: data))
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-
} else {
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+
case let value as UUID:
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parent.register(UUIDOptimizer(value: value))
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+
case let value as Data:
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parent.register(ByteStringOptimizer(value: value))
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// #if canImport(Float16)
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// case let value as Float16:
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// parent.register(Float16Optimizer(value: value))
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// #endif
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default:
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try value.encode(to: self)
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}
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}
+32
Sources/CBOR/Encoder/Optimizers/Float16Optimizer.swift
+32
Sources/CBOR/Encoder/Optimizers/Float16Optimizer.swift
···
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+
//
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// FloatOptimizer.swift
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// SwiftCBOR
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//
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// Created by Khan Winter on 9/01/25.
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//
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+
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// Would love to enable this, also see SingleValueCBOREncodingContainer for the other half of this
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// but I'm not entirely sure how to make it work in that container and still compile on every machine
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// and platform this library supports...
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+
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// @available(macOS 11, iOS 14, tvOS 14, watchOS 7, *)
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// struct Float16Optimizer: EncodingOptimizer {
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// let value: Float16
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//
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// var type: MajorType { .simple }
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// var argument: UInt8 { 25 }
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// var contentSize: Int { 2 }
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//
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// init(value: Float16) {
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// self.value = value
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// }
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//
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// func writePayload(to data: inout Slice<UnsafeMutableRawBufferPointer>) {
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// assert(data.count >= 2)
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// var bytes = value.bitPattern.bigEndian
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// withUnsafeBytes(of: &bytes) { ptr in
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// UnsafeMutableRawBufferPointer(rebasing: data).copyBytes(from: ptr)
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// }
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// data.removeFirst(2)
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// }
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// }
+18
Tests/CBORTests/EncodableTests.swift
+18
Tests/CBORTests/EncodableTests.swift
···
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let data = try encoder.encode(1999)
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#expect(data == "1907CF".asHexData())
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}
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+
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@Test(
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.disabled("Disabled until we can figure out how to make Float16 compile on all platforms."),
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arguments: [
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("F90000", 0),
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("F93C00", 1.0),
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("F9BE00", -1.5),
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("F97C00", .infinity),
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("F93E32", 1.548828125),
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+
("F9F021", -8456)
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]
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+
)
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+
func halfFloat(expected: String, value: Float16) throws {
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+
let expectedData = expected.asHexData()
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+
let encoder = CBOREncoder()
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+
let data = try encoder.encode(value)
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#expect(data == expectedData)
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+
}
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}