0001    // Base64.swift
0002    //
0003    // The MIT License (MIT)
0004    //
0005    // Copyright (c) 2015 Zewo
0006    //
0007    // Permission is hereby granted, free of charge, to any person obtaining a copy
0008    // of this software and associated documentation files (the "Software"), to deal
0009    // in the Software without restriction, including without limitation the rights
0010    // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
0011    // copies of the Software, and to permit persons to whom the Software is
0012    // furnished to do so, subject to the following conditions:
0013    //
0014    // The above copyright notice and this permission notice shall be included in all
0015    // copies or substantial portions of the Software.
0016    //
0017    // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0018    // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0019    // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
0020    // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0021    // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
0022    // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
0023    // SOFTWARE.
0024    
0025    private class Base64Encoder
Base64.swift:54
		guard value <= 64 else { return Base64Encoder.paddingChar }
Base64.swift:81
					output.append(Base64Encoder.newlineChar)
Base64.swift:101
			output.append(Base64Encoder.paddingChar)
Base64.swift:102
			output.append(Base64Encoder.paddingChar)
Base64.swift:105
			output.append(Base64Encoder.paddingChar)
Base64.swift:108
			output.append(Base64Encoder.newlineChar)
Base64.swift:175
		let encoder = Base64Encoder(bytes: data.uBytes, charsPerLine: charsPerLine, specialChars: specialChars)
 {
0026    
0027    	enum Step
Base64.swift:34
	var step: Step = .A
 { case A
Base64.swift:34
	var step: Step = .A
Base64.swift:63
		case .A:
Base64.swift:85
			step = .A
Base64.swift:97
		case .A:
, B
Base64.swift:67
			step = .B
Base64.swift:68
		case .B:
Base64.swift:99
		case .B:
, C
Base64.swift:72
			step = .C
Base64.swift:73
		case .C:
Base64.swift:103
		case .C:
 }
0028    
0029    	static let paddingChar
Base64.swift:54
		guard value <= 64 else { return Base64Encoder.paddingChar }
Base64.swift:101
			output.append(Base64Encoder.paddingChar)
Base64.swift:102
			output.append(Base64Encoder.paddingChar)
Base64.swift:105
			output.append(Base64Encoder.paddingChar)
: UInt8 = 0x3D // =
0030    	static let newlineChar
Base64.swift:81
					output.append(Base64Encoder.newlineChar)
Base64.swift:108
			output.append(Base64Encoder.newlineChar)
: UInt8 = 0x0A // \n
0031    
0032    	let chars
Base64.swift:48
		self.chars = Array("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".unicodeScalars) + Array((specialChars ?? "+/").unicodeScalars)
Base64.swift:55
		return UInt8(chars[Int(value)].value)
: [UnicodeScalar]
0033    
0034    	var step
Base64.swift:62
		switch step {
Base64.swift:67
			step = .B
Base64.swift:72
			step = .C
Base64.swift:85
			step = .A
Base64.swift:96
		switch step {
: Step = .A
0035    	var result
Base64.swift:64
			result = (fragment & 0x0fc) >> 2
Base64.swift:65
			output.append(encodeValue(result))
Base64.swift:66
			result = (fragment & 0x003) << 4
Base64.swift:69
			result |= (fragment & 0x0f0) >> 4
Base64.swift:70
			output.append(encodeValue(result))
Base64.swift:71
			result = (fragment & 0x00f) << 2
Base64.swift:74
			result |= (fragment & 0x0c0) >> 6
Base64.swift:75
			output.append(encodeValue(result))
Base64.swift:76
			result  = (fragment & 0x03f) >> 0
Base64.swift:77
			output.append(encodeValue(result))
Base64.swift:100
			output.append(encodeValue(result))
Base64.swift:104
			output.append(encodeValue(result))
: UInt8 = 0
0036    
0037    	var charsPerLine
Base64.swift:46
		self.charsPerLine = charsPerLine
Base64.swift:78
			if let charsPerLine = self.charsPerLine {
Base64.swift:107
		if let _ = self.charsPerLine {
: Int?
0038    	var stepcount
Base64.swift:79
				stepcount++
Base64.swift:80
				if stepcount == charsPerLine/4 {
Base64.swift:82
					stepcount = 0
: Int = 0
0039    
0040    	let bytes
Base64.swift:47
		self.bytes = bytes
Base64.swift:59
		let fragment = bytes[offset]
Base64.swift:88
		if offset < bytes.count {
: [UInt8]
0041    
0042    	var offset
Base64.swift:59
		let fragment = bytes[offset]
Base64.swift:60
		offset++
Base64.swift:88
		if offset < bytes.count {
 = 0
0043    	var output
Base64.swift:65
			output.append(encodeValue(result))
Base64.swift:70
			output.append(encodeValue(result))
Base64.swift:75
			output.append(encodeValue(result))
Base64.swift:77
			output.append(encodeValue(result))
Base64.swift:81
					output.append(Base64Encoder.newlineChar)
Base64.swift:100
			output.append(encodeValue(result))
Base64.swift:101
			output.append(Base64Encoder.paddingChar)
Base64.swift:102
			output.append(Base64Encoder.paddingChar)
Base64.swift:104
			output.append(encodeValue(result))
Base64.swift:105
			output.append(Base64Encoder.paddingChar)
Base64.swift:108
			output.append(Base64Encoder.newlineChar)
Base64.swift:176
		return Data(uBytes: encoder.output)
: [UInt8] = []
0044    
0045    	init
Base64.swift:175
		let encoder = Base64Encoder(bytes: data.uBytes, charsPerLine: charsPerLine, specialChars: specialChars)
(bytes: [UInt8], charsPerLine: Int? = nil, specialChars: String? = nil) {
0046    		self.charsPerLine = charsPerLine
0047    		self.bytes = bytes
0048    		self.chars = Array("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789".unicodeScalars) + Array((specialChars ?? "+/").unicodeScalars)
0049    		guard bytes.count > 0 else { return }
0050    		encodeBlock()
0051    	}
0052    
0053    	func encodeValue
Base64.swift:65
			output.append(encodeValue(result))
Base64.swift:70
			output.append(encodeValue(result))
Base64.swift:75
			output.append(encodeValue(result))
Base64.swift:77
			output.append(encodeValue(result))
Base64.swift:100
			output.append(encodeValue(result))
Base64.swift:104
			output.append(encodeValue(result))
(value: UInt8) -> UInt8 {
0054    		guard value <= 64 else { return Base64Encoder.paddingChar }
0055    		return UInt8(chars[Int(value)].value)
0056    	}
0057    
0058    	func encodeBlock
Base64.swift:50
		encodeBlock()
Base64.swift:89
			encodeBlock()
() {
0059    		let fragment = bytes[offset]
0060    		offset++
0061    
0062    		switch step {
0063    		case .A:
0064    			result = (fragment & 0x0fc) >> 2
0065    			output.append(encodeValue(result))
0066    			result = (fragment & 0x003) << 4
0067    			step = .B
0068    		case .B:
0069    			result |= (fragment & 0x0f0) >> 4
0070    			output.append(encodeValue(result))
0071    			result = (fragment & 0x00f) << 2
0072    			step = .C
0073    		case .C:
0074    			result |= (fragment & 0x0c0) >> 6
0075    			output.append(encodeValue(result))
0076    			result  = (fragment & 0x03f) >> 0
0077    			output.append(encodeValue(result))
0078    			if let charsPerLine = self.charsPerLine {
0079    				stepcount++
0080    				if stepcount == charsPerLine/4 {
0081    					output.append(Base64Encoder.newlineChar)
0082    					stepcount = 0
0083    				}
0084    			}
0085    			step = .A
0086    		}
0087    
0088    		if offset < bytes.count {
0089    			encodeBlock()
0090    		} else {
0091    			encodeBlockEnd()
0092    		}
0093    	}
0094    
0095    	func encodeBlockEnd
Base64.swift:91
			encodeBlockEnd()
() {
0096    		switch step {
0097    		case .A:
0098    			break
0099    		case .B:
0100    			output.append(encodeValue(result))
0101    			output.append(Base64Encoder.paddingChar)
0102    			output.append(Base64Encoder.paddingChar)
0103    		case .C:
0104    			output.append(encodeValue(result))
0105    			output.append(Base64Encoder.paddingChar)
0106    		}
0107    		if let _ = self.charsPerLine {
0108    			output.append(Base64Encoder.newlineChar)
0109    		}
0110    	}
0111    
0112    }
0113    
0114    private class Base64Decoder
Base64.swift:122
		guard tmp >= 0 && tmp < Base64Decoder.decoding.count else { return -1 }
Base64.swift:123
		return Base64Decoder.decoding[tmp]
Base64.swift:146
			tmpFragment = Base64Decoder.decodeValue(byte)
Base64.swift:180
		let decoder = Base64Decoder(bytes: data.uBytes)
 {
0115    
0116    	enum Step
Base64.swift:126
	var step: Step = .A
 { case A
Base64.swift:126
	var step: Step = .A
Base64.swift:151
		case .A:
Base64.swift:164
			step = .A
, B
Base64.swift:153
			step = .B
Base64.swift:154
		case .B:
, C
Base64.swift:157
			step = .C
Base64.swift:158
		case .C:
, D
Base64.swift:161
			step = .D
Base64.swift:162
		case .D:
 }
0117    
0118    	static let decoding
Base64.swift:122
		guard tmp >= 0 && tmp < Base64Decoder.decoding.count else { return -1 }
Base64.swift:123
		return Base64Decoder.decoding[tmp]
: [Int8] = [62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51]
0119    
0120    	static func decodeValue
Base64.swift:146
			tmpFragment = Base64Decoder.decodeValue(byte)
(value: UInt8) -> Int8 {
0121    		let tmp = Int(value) - 43
0122    		guard tmp >= 0 && tmp < Base64Decoder.decoding.count else { return -1 }
0123    		return Base64Decoder.decoding[tmp]
0124    	}
0125    
0126    	var step
Base64.swift:150
		switch step {
Base64.swift:153
			step = .B
Base64.swift:157
			step = .C
Base64.swift:161
			step = .D
Base64.swift:164
			step = .A
: Step = .A
0127    
0128    	let bytes
Base64.swift:135
		self.bytes = bytes
Base64.swift:144
			guard offset < bytes.count else { return }
Base64.swift:145
			let byte = bytes[offset++]
: [UInt8]
0129    	var offset
Base64.swift:144
			guard offset < bytes.count else { return }
Base64.swift:145
			let byte = bytes[offset++]
 = 0
0130    
0131    	var output
Base64.swift:136
		self.output = [UInt8](count: bytes.count, repeatedValue: 0)
Base64.swift:152
			output[outputOffset]	 = (fragment & 0x03f) << 2
Base64.swift:155
			output[outputOffset++]	|= (fragment & 0x030) >> 4
Base64.swift:156
			output[outputOffset]	 = (fragment & 0x00f) << 4
Base64.swift:159
			output[outputOffset++]	|= (fragment & 0x03c) >> 2
Base64.swift:160
			output[outputOffset]	 = (fragment & 0x003) << 6
Base64.swift:163
			output[outputOffset++]	|= (fragment & 0x03f)
Base64.swift:181
		return Data(uBytes: decoder.output)
: [UInt8]
0132    	var outputOffset
Base64.swift:152
			output[outputOffset]	 = (fragment & 0x03f) << 2
Base64.swift:155
			output[outputOffset++]	|= (fragment & 0x030) >> 4
Base64.swift:156
			output[outputOffset]	 = (fragment & 0x00f) << 4
Base64.swift:159
			output[outputOffset++]	|= (fragment & 0x03c) >> 2
Base64.swift:160
			output[outputOffset]	 = (fragment & 0x003) << 6
Base64.swift:163
			output[outputOffset++]	|= (fragment & 0x03f)
 = 0
0133    
0134    	init
Base64.swift:180
		let decoder = Base64Decoder(bytes: data.uBytes)
(bytes: [UInt8]) {
0135    		self.bytes = bytes
0136    		self.output = [UInt8](count: bytes.count, repeatedValue: 0)
0137    		guard bytes.count > 0 else { return }
0138    		decodeBlock()
0139    	}
0140    
0141    	func decodeBlock
Base64.swift:138
		decodeBlock()
Base64.swift:167
		decodeBlock()
() {
0142    		var tmpFragment: Int8
0143    		repeat {
0144    			guard offset < bytes.count else { return }
0145    			let byte = bytes[offset++]
0146    			tmpFragment = Base64Decoder.decodeValue(byte)
0147    		} while (tmpFragment < 0)
0148    		let fragment = UInt8(bitPattern: tmpFragment)
0149    
0150    		switch step {
0151    		case .A:
0152    			output[outputOffset]	 = (fragment & 0x03f) << 2
0153    			step = .B
0154    		case .B:
0155    			output[outputOffset++]	|= (fragment & 0x030) >> 4
0156    			output[outputOffset]	 = (fragment & 0x00f) << 4
0157    			step = .C
0158    		case .C:
0159    			output[outputOffset++]	|= (fragment & 0x03c) >> 2
0160    			output[outputOffset]	 = (fragment & 0x003) << 6
0161    			step = .D
0162    		case .D:
0163    			output[outputOffset++]	|= (fragment & 0x03f)
0164    			step = .A
0165    		}
0166    
0167    		decodeBlock()
0168    	}
0169    
0170    }
0171    
0172    public final class Base64 {
0173    
0174    	public static func encode(data: Data, charsPerLine: Int? = nil, specialChars: String? = nil) -> Data {
0175    		let encoder = Base64Encoder(bytes: data.uBytes, charsPerLine: charsPerLine, specialChars: specialChars)
0176    		return Data(uBytes: encoder.output)
0177    	}
0178    
0179    	public static func decode(data: Data) -> Data {
0180    		let decoder = Base64Decoder(bytes: data.uBytes)
0181    		return Data(uBytes: decoder.output)
0182    	}
0183    
0184    }
0185