smart poster implementation

NFCNDEFParse.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'NFCNDEFParse'
-  s.version          = '0.1.2'
+  s.version          = '0.2.0'
   s.summary          = 'NFC Forum Well Known Type Data Parser for iOS11 and Core NFC'
 
 # This description is used to generate tags and improve search results.
@@ -22,7 +22,7 @@ NFC Forum Well Known Type Data Parser for iOS11 and Core NFC.
 Supports parsing of types:
 Text - NFCForum-TS-RTD_Text_1.0 2006-07-24
 Uri - NFCForum-TS-RTD_URI_1.0 2006-07-24
-Smart Poster - NFCForum-SmartPoster_RTD_1.0 2006-07-24
+Smart Poster - NFCForum-SmartPoster_RTD_1.0 2006-07-24 (with some limitations)
 DESC
 
   s.homepage         = 'https://github.com/jvk75/NFCNDEFParse'

NFCNDEFParse/NDEFMessageWithWellKnownTypeUri.swift

@@ -19,7 +19,11 @@ public class NFCForumWellKnownTypeUri: NFCForumWellKnownTypeUriProtocol {
 
     public var url: URL?
     public var string: String?
-
+
+    public var description: String {
+        return "- \(self.type): \n\tstring: \(string ?? "%EMPTY%") \n\turl: \(url?.absoluteString ?? "%EMPTY%")"
+    }
+
     public init?(payload: Data) {
         let bytes = [UInt8](payload)
         let uriIdentifierByte = bytes[0]

NFCNDEFParse/NDEFMessageWithWellKnownTypes.swift

@@ -16,6 +16,9 @@ public enum NFCForumWellKnownType: String {
     case text = "T"
     case uri = "U"
     case smartPoster = "Sp"
+    case action = "act" // smart poster sub type
+    case size = "s" // smart poster sub type
+    case type = "t" // smart poster sub type
     case unknown
 
     init(data: Data) {
@@ -44,6 +47,8 @@ public class NDEFMessageWithWellKnownTypes {
                 return NFCForumWellKnownTypeText(payload: record.payload)
             case .uri:
                 return NFCForumWellKnownTypeUri(payload: record.payload)
+            case .smartPoster:
+                return NFCForumWellKnownTypeSmartPoster(payload: record.payload)
             default:
                 return nil
             }

NFCNDEFParse/NFCForumWellKnownTypeProtocols.swift

@@ -9,8 +9,11 @@ import Foundation
 import CoreNFC
 
 /// - type : NFCForumWellKnownType
+/// - description : String
+///   - record description (values)
 public protocol NFCForumWellKnownTypeProtocol {
     var type: NFCForumWellKnownType {get}
+    var description: String {get}
 }
 
 /// - string : String
@@ -26,3 +29,10 @@ public protocol NFCForumWellKnownTypeUriProtocol: NFCForumWellKnownTypeProtocol
     var url: URL? {get}
     var string: String? {get}
 }
+
+
+/// - records: [NFCForumWellKnownTypeProtocol]
+public protocol NFCForumWellKnownTypeSmartPosterProtocol: NFCForumWellKnownTypeProtocol {
+    var records: [NFCForumWellKnownTypeProtocol] {get}
+}
+

NFCNDEFParse/NFCForumWellKnownTypeSmartPoster.swift

@@ -9,15 +9,52 @@ import Foundation
 import CoreNFC
 
 /// NFCForum-SmartPoster_RTD_1.0 2006-07-24
+/// (only URI and Text records supported, Action and Size records are ignored, Type and Icon records may cause problems)
 /// - records : [NFCForumWellKnownTypeProtocol]
 ///   - collection of the NFCForumWellKnownTypes
-public class NFCForumWellKnownTypeSmartPoster: NFCForumWellKnownTypeProtocol {
+public class NFCForumWellKnownTypeSmartPoster: NFCForumWellKnownTypeSmartPosterProtocol {
 
     public var type: NFCForumWellKnownType = .smartPoster
 
-    public var records: [NFCForumWellKnownTypeProtocol] = []
-
+    public var records: [NFCForumWellKnownTypeProtocol]
+
+    public var description: String {
+        let recordDescriptions = records.map({ $0.description }).joined(separator: "\n")
+        return "- \(self.type): {\n\(recordDescriptions)\n}\n"
+    }
+
+    private var payloadFirstByte: Int = 0
+
     public init?(payload: Data) {
-        //TBA
+        let allBytes = [UInt8](payload)
+        var newRecords: [NFCForumWellKnownTypeProtocol?] = []
+        while payloadFirstByte < allBytes.count {
+            let bytes = Array(allBytes[payloadFirstByte...])
+
+            let typeLength = Int(bytes[1])
+            let type = NFCForumWellKnownType(data: Data(bytes: bytes[3...(2+typeLength)]))
+
+            let payloadLength: Int
+            switch type {
+            case .action:
+                payloadLength = 1
+            case .size:
+                payloadLength = 4
+            default:
+                payloadLength = Int(bytes[2])
+            }
+
+            let payloadLastByte = (2+typeLength) + payloadLength
+
+            let payload = bytes[(2+typeLength + 1)...payloadLastByte]
+            if  type == .uri {
+                newRecords.append(NFCForumWellKnownTypeUri(payload: Data(bytes: payload)))
+            }
+            if  type == .text {
+                newRecords.append(NFCForumWellKnownTypeText(payload: Data(bytes: payload)))
+            }
+            payloadFirstByte += payloadLastByte + 1
+        }
+        self.records = newRecords.flatMap({ $0 })
     }
 }

NFCNDEFParse/NFCForumWellKnownTypeText.swift

@@ -19,7 +19,11 @@ public class NFCForumWellKnownTypeText: NFCForumWellKnownTypeTextProtocol {
 
     public var string: String?
     public var locale: String?
-
+
+    public var description: String {
+        return "- \(self.type): \n\tstring: \(string ?? "%EMPTY%") \n\tlocale: \(locale ?? "%EMPTY%")"
+    }
+
     private var localeLength: Int = 0
     private var encoding: String.Encoding = .utf8
 

README.md

@@ -8,7 +8,7 @@ Text - NFCForum-TS-RTD_Text_1.0 2006-07-24
 
 Uri - NFCForum-TS-RTD_URI_1.0 2006-07-24
 
-Smart Poster - NFCForum-SmartPoster_RTD_1.0 2006-07-24 (TBA)
+Smart Poster - NFCForum-SmartPoster_RTD_1.0 2006-07-24 (with some limitations)
 
 ## Requirements
 
@@ -48,15 +48,11 @@ func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NF
 Loop through the data array to print out the values.
 
 ```
-data.records.forEach({ record in
-    if record.type == .text, let record = record as? NFCForumWellKnownTypeTextProtocol {
-        print(record.string)
-        print(record.locale)
-    }
-    if record.type == .uri, let record = record as? NFCForumWellKnownTypeUriProtocol {
-        print(record.string)
-        print(record.url)
-    }
+data.forEach({ message in
+    print("message: ")
+    message.records.forEach({ record in
+        print(record.description)
+    })
 })
 
 ```