e09e34aa61
Co-authored-by: Hugh Nimmo-Smith <hughns@users.noreply.github.com> Co-authored-by: Hugh Nimmo-Smith <hughns@element.io>
43 lines
1.3 KiB
Swift
43 lines
1.3 KiB
Swift
//
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// Copyright 2024 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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extension Data {
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init?(hexString: String) {
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self.init()
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var hex = hexString
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// If the hex string has an odd length, prepend a zero
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if hex.count % 2 != 0 {
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hex = "0" + hex
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}
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for i in stride(from: 0, to: hex.count, by: 2) {
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let startIndex = hex.index(hex.startIndex, offsetBy: i)
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let endIndex = hex.index(hex.startIndex, offsetBy: i + 2)
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let byteString = String(hex[startIndex..<endIndex])
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if let byte = UInt8(byteString, radix: 16) {
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append(byte)
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} else {
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return nil
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}
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}
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}
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}
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