44 lines
1.2 KiB
Swift
44 lines
1.2 KiB
Swift
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import Foundation
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enum DeviceInfoError: Error {
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case missingData
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}
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extension Data {
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mutating func decodeUInt16() throws -> UInt16 {
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guard count >= 2 else {
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throw DeviceInfoError.missingData
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}
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let low = removeFirst()
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let high = removeFirst()
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return UInt16(high: high, low: low)
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}
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mutating func decodeTwoByteInteger() throws -> Int {
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try decodeUInt16().integer
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}
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mutating func decodeFourByteInteger() throws -> Int {
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guard count >= 4 else {
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throw DeviceInfoError.missingData
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}
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let byte0 = removeFirst()
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let byte1 = removeFirst()
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let byte2 = removeFirst()
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let byte3 = removeFirst()
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return (Int(byte3) << 24) | (Int(byte2) << 16) | (Int(byte1) << 8) | Int(byte0)
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}
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mutating func decodeSensor() throws -> TemperatureSensor? {
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guard count >= 11 else {
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throw DeviceInfoError.missingData
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}
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let address = Array(self[startIndex..<startIndex+8])
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removeFirst(8)
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let temperatureByte = removeFirst()
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let time = try decodeUInt16()
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return .init(address: address, valueByte: temperatureByte, secondsAgo: time)
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}
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}
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