split quotedprintable and utf8 converters

app/converter/quotedprintabledecoder.ts

@@ -15,7 +15,7 @@ export class QuotedPrintableDecoder implements Converter {
 
     convert(input:string):string {
         try {
-            return this.nativeLibraryWrapperService.utf8.decode(this.nativeLibraryWrapperService.quotedPrintable.decode(input));
+            return this.nativeLibraryWrapperService.quotedPrintable.decode(input);
         } catch (error) {
             throw new Error("The input can not be interpreted as quoted-printable. May be corrupt?");
         }

app/converter/quotedprintableencoder.ts

@@ -14,6 +14,6 @@ export class QuotedPrintableEncoder implements Converter {
     }
 
     convert(input:string):string {
-        return this.nativeLibraryWrapperService.quotedPrintable.encode(this.nativeLibraryWrapperService.utf8.encode(input));
+        return this.nativeLibraryWrapperService.quotedPrintable.encode(input);
     }
 }

app/converter/utf8decoder.ts

@@ -0,0 +1,23 @@
+import {Converter} from "./converter";
+import {NativeLibraryWrapperService} from "../nativelibrarywrapper.service";
+
+export class UTF8Decoder implements Converter {
+    constructor(private nativeLibraryWrapperService:NativeLibraryWrapperService) {
+    }
+
+    getDisplayname():string {
+        return "Decode UTF-8";
+    }
+
+    getId():string {
+        return "decodeutf8";
+    }
+
+    convert(input:string):string {
+        try {
+            return this.nativeLibraryWrapperService.utf8.decode(input);
+        } catch (error) {
+            throw new Error("The input can not be interpreted a valid UTF-8 encoded string. May be corrupt?");
+        }
+    }
+}

app/converter/utf8encoder.ts

@@ -0,0 +1,23 @@
+import {Converter} from "./converter";
+import {NativeLibraryWrapperService} from "../nativelibrarywrapper.service";
+
+export class UTF8Encoder implements Converter {
+    constructor(private nativeLibraryWrapperService:NativeLibraryWrapperService) {
+    }
+
+    getDisplayname():string {
+        return "Encode UTF-8";
+    }
+
+    getId():string {
+        return "encodeutf8";
+    }
+
+    convert(input:string):string {
+        try {
+            return this.nativeLibraryWrapperService.utf8.encode(input);
+        } catch (error) {
+            throw new Error("The input can not be encoded as UTF-8. May be corrupt?");
+        }
+    }
+}

app/converterregistry.service.ts

@@ -17,6 +17,8 @@ import {QuotedPrintableEncoder} from "./converter/quotedprintableencoder";
 import {NativeLibraryWrapperService} from "./nativelibrarywrapper.service";
 import {PunycodeEncoder} from "./converter/punycodeencoder";
 import {PunycodeDecoder} from "./converter/punycodedecoder";
+import {UTF8Encoder} from "./converter/utf8encoder";
+import {UTF8Decoder} from "./converter/utf8decoder";
 
 @Injectable()
 export class ConverterRegistryService {
@@ -56,6 +58,8 @@ export class ConverterRegistryService {
         this.registerConverter(new BinToDecConverter());
         this.registerConverter(new PunycodeEncoder(this.wrapper));
         this.registerConverter(new PunycodeDecoder(this.wrapper));
+        this.registerConverter(new UTF8Encoder(this.wrapper));
+        this.registerConverter(new UTF8Decoder(this.wrapper));
     }
 
     private registerConverter(converter:Converter):void {