0001    //
0002    //  String+BASE64.swift
0003    //  Swifter
0004    //
0005    //  Copyright © 2016 Damian Kołakowski. All rights reserved.
0006    //
0007    
0008    #if os(Linux)
0009        import Glibc
0010    #else
0011        import Foundation
0012    #endif
0013    
0014    
0015    extension String {
0016        
0017        private static let CODES
String+BASE64.swift:28
            result.append(CODES[Int(tmp)])
String+BASE64.swift:32
                result.append(CODES[Int(tmp)]);
String+BASE64.swift:36
                    result.append(CODES[Int(tmp)]);
String+BASE64.swift:38
                    result.append(CODES[Int(tmp)]);
String+BASE64.swift:40
                    result.append(CODES[Int(tmp)]);
String+BASE64.swift:44
                result.append(CODES[Int(tmp)]);
 = [UInt8]("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=".utf8)
0018        
0019        public static func toBase64
HttpHandlers+WebSockets.swift:41
            let secWebSocketAccept = String.toBase64((secWebSocketKey + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").SHA1())
(data: [UInt8]) -> String {
0020            
0021            // Based on: https://en.wikipedia.org/wiki/Base64#Sample_Implementation_in_Java
0022            
0023            var result = [UInt8]()
0024            var tmp: UInt8
0025            for index in 0.stride(to: data.count, by: 3) {
0026                let byte = data[index]
0027                tmp = (byte & 0xFC) >> 2;
0028                result.append(CODES[Int(tmp)])
0029                tmp = (byte & 0x03) << 4;
0030                if index + 1 < data.count {
0031                    tmp |= (data[index + 1] & 0xF0) >> 4;
0032                    result.append(CODES[Int(tmp)]);
0033                    tmp = (data[index + 1] & 0x0F) << 2;
0034                    if (index + 2 < data.count)  {
0035                        tmp |= (data[index + 2] & 0xC0) >> 6;
0036                        result.append(CODES[Int(tmp)]);
0037                        tmp = data[index + 2] & 0x3F;
0038                        result.append(CODES[Int(tmp)]);
0039                    } else  {
0040                        result.append(CODES[Int(tmp)]);
0041                        result.appendContentsOf([UInt8]("=".utf8));
0042                    }
0043                } else {
0044                    result.append(CODES[Int(tmp)]);
0045                    result.appendContentsOf([UInt8]("==".utf8));
0046                }
0047            }
0048            return String.fromUInt8(result)
0049        }
0050    }
0051