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Convert UInt to UInt8(byte) Array in swift.
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protocol UIntToBytesConvertable { | |
var toBytes: [UInt8] { get } | |
} | |
extension UIntToBytesConvertable { | |
func toByteArr<T: BinaryInteger>(endian: T, count: Int) -> [UInt8] { | |
var _endian = endian | |
let bytePtr = withUnsafePointer(to: &_endian) { | |
$0.withMemoryRebound(to: UInt8.self, capacity: count) { | |
UnsafeBufferPointer(start: $0, count: count) | |
} | |
} | |
return [UInt8](bytePtr) | |
} | |
} | |
extension UInt16: UIntToBytesConvertable { | |
var toBytes: [UInt8] { | |
if CFByteOrderGetCurrent() == Int(CFByteOrderLittleEndian.rawValue) { | |
return toByteArr(endian: self.littleEndian, | |
count: MemoryLayout<UInt16>.size) | |
} else { | |
return toByteArr(endian: self.bigEndian, | |
count: MemoryLayout<UInt16>.size) | |
} | |
} | |
} | |
extension UInt32: UIntToBytesConvertable { | |
var toBytes: [UInt8] { | |
if CFByteOrderGetCurrent() == Int(CFByteOrderLittleEndian.rawValue) { | |
return toByteArr(endian: self.littleEndian, | |
count: MemoryLayout<UInt32>.size) | |
} else { | |
return toByteArr(endian: self.bigEndian, | |
count: MemoryLayout<UInt32>.size) | |
} | |
} | |
} | |
extension UInt64: UIntToBytesConvertable { | |
var toBytes: [UInt8] { | |
if CFByteOrderGetCurrent() == Int(CFByteOrderLittleEndian.rawValue) { | |
return toByteArr(endian: self.littleEndian, | |
count: MemoryLayout<UInt64>.size) | |
} else { | |
return toByteArr(endian: self.bigEndian, | |
count: MemoryLayout<UInt64>.size) | |
} | |
} | |
} |
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@Planet30
As the image above, we don't need to order of the bytes and just use the bit shift operator.
ex)
let arrayOfBytes = [0x12,0x34]
var uintOf16 = arrayOfBytes[0] << 8 | arrayOfBytes[1]