mirror of
https://github.com/OpenEmu/OpenEmuKit.git
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51 lines
2.2 KiB
Swift
51 lines
2.2 KiB
Swift
// Copyright (c) 2021, OpenEmu Team
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the OpenEmu Team nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY OpenEmu Team ''AS IS'' AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL OpenEmu Team BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import Foundation
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let charA = UInt8(ascii: "a")
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let char0 = UInt8(ascii: "0")
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private func itoh(_ value: UInt8) -> UInt8 {
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assert(value <= 0xF)
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return (value > 9) ? (charA + value - 10) : (char0 + value)
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}
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extension DataProtocol {
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/// Returns a hexidecimal encoding of the receiver.
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var hexString: String {
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let hexLen = self.count * 2
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let ptr = UnsafeMutablePointer<UInt8>.allocate(capacity: hexLen)
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var offset = 0
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for i in self {
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ptr[offset ] = itoh((i >> 4) & 0xF)
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ptr[offset + 1] = itoh(i & 0xF)
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offset += 2
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}
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return String(bytesNoCopy: ptr, length: hexLen, encoding: .utf8, freeWhenDone: true)!
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}
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}
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