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UInt32(littleEndian32Bits:) and UInt32.littleEndianData
This will be used for extracting intermediate key expiration from the new signature format.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,30 @@ | ||
| // | ||
| // Copyright RevenueCat Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the MIT License (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://opensource.org/licenses/MIT | ||
| // | ||
| // Integer+Extensions.swift | ||
| // | ||
| // Created by Nacho Soto on 6/26/23. | ||
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| import Foundation | ||
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| extension UInt32 { | ||
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| /// Converts 32 bits of little-endian `Data` into a `UInt32`. | ||
| init(littleEndian32Bits data: Data) { | ||
| assert(data.count == 4, "Data needs to be 32bits: \(data)") | ||
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| self.init(littleEndian: data.withUnsafeBytes { $0.load(as: UInt32.self) }) | ||
| } | ||
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| /// - Returns: the `Data` representation as little-endian 32 bits. | ||
| var littleEndianData: Data { | ||
| return Data(withUnsafeBytes(of: self.littleEndian, Array.init)) | ||
| } | ||
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| } |
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Tests/UnitTests/FoundationExtensions/IntegerExtensionsTests.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| // | ||
| // Copyright RevenueCat Inc. All Rights Reserved. | ||
| // | ||
| // Licensed under the MIT License (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://opensource.org/licenses/MIT | ||
| // | ||
| // IntegerExtensionsTests.swift | ||
| // | ||
| // Created by Nacho Soto on 6/26/23. | ||
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| import Nimble | ||
| import XCTest | ||
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| @testable import RevenueCat | ||
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| class IntegerExtensionsTests: TestCase { | ||
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| func testParseUInt32Data() { | ||
| expect(UInt32(littleEndian32Bits: Data([0x00, 0x00, 0x00, 0x00]))) == 0 | ||
| expect(UInt32(littleEndian32Bits: Data([0x01, 0x00, 0x00, 0x00]))) == 1 | ||
| expect(UInt32(littleEndian32Bits: Data([0xff, 0x00, 0x00, 0x00]))) == 255 | ||
| expect(UInt32(littleEndian32Bits: Data([0xff, 0xff, 0xff, 0xff]))) == UInt32(2 ^^ 32 - 1) | ||
| } | ||
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| func testUInt32ToData() { | ||
| expect(UInt32(0).littleEndianData) == Data([0x00, 0x00, 0x00, 0x00]) | ||
| expect(UInt32(1).littleEndianData) == Data([0x01, 0x00, 0x00, 0x00]) | ||
| expect(UInt32(255).littleEndianData) == Data([0xff, 0x00, 0x00, 0x00]) | ||
| expect(UInt32(2 ^^ 32 - 1).littleEndianData) == Data([0xff, 0xff, 0xff, 0xff]) | ||
| } | ||
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| func testUInt32BidirectionalConversion() { | ||
| expect(UInt32(0).encodeAndDecode()) == 0 | ||
| expect(UInt32(1).encodeAndDecode()) == 1 | ||
| expect(UInt32(255).encodeAndDecode()) == 255 | ||
| expect(UInt32(2 ^^ 32 - 1).encodeAndDecode()) == UInt32(2 ^^ 32 - 1) | ||
| } | ||
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| } | ||
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| private extension UInt32 { | ||
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| func encodeAndDecode() -> Self { | ||
| return UInt32(littleEndian32Bits: self.littleEndianData) | ||
| } | ||
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| } | ||
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| // MARK: - | ||
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| precedencegroup PowerPrecedence { higherThan: MultiplicationPrecedence } | ||
| infix operator ^^ : PowerPrecedence | ||
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| /// Returns `radis` raised to `power`. | ||
| private func ^^ (radix: Int, power: Int) -> Int { | ||
| return Int(pow(Double(radix), Double(power))) | ||
| } |