63 lines
2.2 KiB
Swift
Executable File
63 lines
2.2 KiB
Swift
Executable File
// MIT License
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//
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// Copyright (c) 2017 Milen Dzhumerov
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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import Foundation
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extension String {
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func clangLowercasedBytes() throws -> Data {
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guard let charBytes = data(using: BinaryHeaderMap.StringEncoding) else {
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throw HeaderMapError.unencodableString
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}
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let lowercasedBytes = charBytes.map { $0.asciiLowercased() }
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return Data(bytes: lowercasedBytes)
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}
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func clangLowercased() throws -> String? {
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return try String(data: clangLowercasedBytes(), encoding: BinaryHeaderMap.StringEncoding)
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}
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var headerMapHash: UInt32? {
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guard
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let characterBytes = try? clangLowercasedBytes()
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else { return nil }
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return characterBytes.withUnsafeBytes {
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(charBlockPointer: UnsafePointer<UInt8>) -> UInt32 in
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var result = UInt32(0)
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for i in 0 ..< characterBytes.count {
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let charPointer = charBlockPointer.advanced(by: i)
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result += UInt32(charPointer.pointee) * 13
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}
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return result
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}
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}
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}
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fileprivate extension UInt8 {
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func asciiLowercased() -> UInt8 {
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let isUppercase = (65 <= self && self <= 90)
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return self + (isUppercase ? 32 : 0)
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}
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}
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