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    @_exported import Data
0026    
0027    public struct Base64
Base64.swift:136
extension Base64 {
 {
0028        public static func decode(string: String) throws -> Data {
0029            let ascii: [Byte] = [
0030                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0031                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0032                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 62, 64, 63,
0033                52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
0034                64, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14,
0035                15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 63,
0036                64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
0037                41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,
0038                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0039                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0040                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0041                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0042                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0043                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0044                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0045                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0046                64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
0047            ]
0048    
0049            var decoded = Data()
0050            var unreadBytes = 0
0051    
0052            for character in string.utf8 {
0053                if ascii[Int(character)] > 63 {
0054                    break
0055                }
0056    
0057                unreadBytes += 1
0058            }
0059    
0060            func byte(index: Int) -> Int {
0061                return Int(Array(string.utf8)[index])
0062            }
0063    
0064            // let encodedBytes = string.utf8.map { Int($0) }
0065            var index = 0
0066    
0067            while unreadBytes > 4 {
0068                decoded.appendByte(ascii[byte(index + 0)] << 2 | ascii[byte(index + 1)] >> 4)
0069                decoded.appendByte(ascii[byte(index + 1)] << 4 | ascii[byte(index + 2)] >> 2)
0070                decoded.appendByte(ascii[byte(index + 2)] << 6 | ascii[byte(index + 3)])
0071                index += 4
0072                unreadBytes -= 4
0073            }
0074    
0075            if unreadBytes > 1 {
0076                decoded.appendByte(ascii[byte(index + 0)] << 2 | ascii[byte(index + 1)] >> 4)
0077            }
0078    
0079            if unreadBytes > 2 {
0080                decoded.appendByte(ascii[byte(index + 1)] << 4 | ascii[byte(index + 2)] >> 2)
0081            }
0082    
0083            if unreadBytes > 3 {
0084                decoded.appendByte(ascii[byte(index + 2)] << 6 | ascii[byte(index + 3)])
0085            }
0086    
0087            return decoded
0088        }
0089    
0090    	public static func encode(data: Data, specialChars: String = "+/", paddingChar: Character? = "=") throws -> String {
0091            let base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" + specialChars
0092            var encoded: String = ""
0093    
0094            func appendCharacterFromBase(character: Int) {
0095                encoded.append(base64[base64.startIndex.advancedBy(character)])
0096            }
0097    
0098            func byte(index: Int) -> Int {
0099                return Int(data[index])
0100            }
0101    
0102            let decodedBytes = data.map { Int($0) }
0103    
0104            var i = 0
0105    
0106            while i < decodedBytes.count - 2 {
0107                appendCharacterFromBase(( byte(i) >> 2) & 0x3F)
0108                appendCharacterFromBase(((byte(i)       & 0x3) << 4) | ((byte(i + 1) & 0xF0) >> 4))
0109                appendCharacterFromBase(((byte(i + 1)   & 0xF) << 2) | ((byte(i + 2) & 0xC0) >> 6))
0110                appendCharacterFromBase(  byte(i + 2)   & 0x3F)
0111                i += 3
0112            }
0113    
0114            if i < decodedBytes.count {
0115                appendCharacterFromBase((byte(i) >> 2) & 0x3F)
0116    
0117                if i == decodedBytes.count - 1 {
0118                    appendCharacterFromBase(((byte(i) & 0x3) << 4))
0119    				if let paddingChar = paddingChar {
0120    					encoded.append(paddingChar)
0121    				}
0122                } else {
0123                    appendCharacterFromBase(((byte(i)     & 0x3) << 4) | ((byte(i + 1) & 0xF0) >> 4))
0124                    appendCharacterFromBase(((byte(i + 1) & 0xF) << 2))
0125                }
0126    
0127    			if let paddingChar = paddingChar {
0128    				encoded.append(paddingChar)
0129    			}
0130            }
0131    
0132            return encoded
0133        }
0134    }
0135    
0136    extension Base64 {
0137        public static func encode
Base64.swift:90
	public static func encode(data: Data, specialChars: String = "+/", paddingChar: Character? = "=") throws -> String {
(convertible: DataConvertible) throws -> String {
0138            return try encode(convertible.data)
0139        }
0140    }