Initial commit

Pods/SwiftyBeaver/Sources/Base64.swift

@@ -0,0 +1,165 @@
+//
+//  Base64.swift
+//  SwiftyBeaver (macOS)
+//
+//  Copyright © 2017 Sebastian Kreutzberger. All rights reserved.
+//
+#if os(Linux)
+import Foundation
+
+struct InvalidBase64: Error {}
+
+struct Base64 {
+    static func decode(_ string: String) throws -> [UInt8] {
+        return try decode([UInt8](string.utf8))
+    }
+
+    /// Decodes a Base64 encoded String into Data
+    ///
+    /// - throws: If the string isn't base64 encoded
+    static func decode(_ string: [UInt8]) throws -> [UInt8] {
+        let lookupTable: [UInt8] = [
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 62, 64, 63,
+            52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
+            64, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14,
+            15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 63,
+            64, 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, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
+            64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
+            ]
+
+        let remainder = string.count % 4
+        let length = (string.count - remainder) / 4
+
+        var decoded = [UInt8]()
+        decoded.reserveCapacity(length)
+
+        var index = 0
+        var i0: UInt8 = 0
+        var i1: UInt8 = 0
+        var i2: UInt8 = 0
+        var i3: UInt8 = 0
+
+        while index &+ 4 < string.count {
+            i0 = lookupTable[numericCast(string[index])]
+            i1 = lookupTable[numericCast(string[index &+ 1])]
+            i2 = lookupTable[numericCast(string[index &+ 2])]
+            i3 = lookupTable[numericCast(string[index &+ 3])]
+
+            if i0 > 63 || i1 > 63 || i2 > 63 || i3 > 63 {
+                throw InvalidBase64()
+            }
+
+            decoded.append(i0 << 2 | i1 >> 4)
+            decoded.append(i1 << 4 | i2 >> 2)
+            decoded.append(i2 << 6 | i3)
+            index += 4
+        }
+
+        if string.count &- index > 1 {
+            i0 = lookupTable[numericCast(string[index])]
+            i1 = lookupTable[numericCast(string[index &+ 1])]
+
+            if i1 > 63 {
+                guard string[index] == 61 else {
+                    throw InvalidBase64()
+                }
+
+                return decoded
+            }
+
+            if i2 > 63 {
+                guard string[index &+ 2] == 61 else {
+                    throw InvalidBase64()
+                }
+
+                return decoded
+            }
+
+            decoded.append(i0 << 2 | i1 >> 4)
+
+            if string.count &- index > 2 {
+                i2 = lookupTable[numericCast(string[index &+ 2])]
+
+                if i2 > 63 {
+                    guard string[index &+ 2] == 61 else {
+                        throw InvalidBase64()
+                    }
+
+                    return decoded
+                }
+
+                decoded.append(i1 << 4 | i2 >> 2)
+
+                if string.count &- index > 3 {
+                    i3 = lookupTable[numericCast(string[index &+ 3])]
+
+                    if i3 > 63 {
+                        guard string[index &+ 3] == 61 else {
+                            throw InvalidBase64()
+                        }
+
+                        return decoded
+                    }
+
+                    decoded.append(i2 << 6 | i3)
+                }
+            }
+        }
+
+        return decoded
+    }
+
+    static func encode(_ data: [UInt8]) -> String {
+        let base64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+        var encoded: String = ""
+
+        func appendCharacterFromBase(_ character: Int) {
+            encoded.append(base64[base64.index(base64.startIndex, offsetBy: character)])
+        }
+
+        func byte(_ index: Int) -> Int {
+            return Int(data[index])
+        }
+
+        let decodedBytes = data.map { Int($0) }
+
+        var i = 0
+
+        while i < decodedBytes.count - 2 {
+            appendCharacterFromBase((byte(i) >> 2) & 0x3F)
+            appendCharacterFromBase(((byte(i) & 0x3) << 4) | ((byte(i + 1) & 0xF0) >> 4))
+            appendCharacterFromBase(((byte(i + 1) & 0xF) << 2) | ((byte(i + 2) & 0xC0) >> 6))
+            appendCharacterFromBase(byte(i + 2) & 0x3F)
+            i += 3
+        }
+
+        if i < decodedBytes.count {
+            appendCharacterFromBase((byte(i) >> 2) & 0x3F)
+
+            if i == decodedBytes.count - 1 {
+                appendCharacterFromBase(((byte(i) & 0x3) << 4))
+                encoded.append("=")
+            } else {
+                appendCharacterFromBase(((byte(i) & 0x3) << 4) | ((byte(i + 1) & 0xF0) >> 4))
+                appendCharacterFromBase(((byte(i + 1) & 0xF) << 2))
+            }
+
+            encoded.append("=")
+        }
+
+        return encoded
+    }
+}
+
+#endif