Added additional checks for DataTooLongExceptions

Added checks for too huge payloads in case version was set manually/fix.

Author: codebude

QRCoder/Exceptions/DataTooLongException.cs

@@ -7,5 +7,10 @@ public class DataTooLongException : Exception
         public DataTooLongException(string eccLevel, string encodingMode, int maxSizeByte) : base(
             $"The given payload exceeds the maximum size of the QR code standard. The maximum size allowed for the choosen paramters (ECC level={eccLevel}, EncodingMode={encodingMode}) is {maxSizeByte} byte."
         ){}
+
+        public DataTooLongException(string eccLevel, string encodingMode, int version, int maxSizeByte) : base(
+            $"The given payload exceeds the maximum size of the QR code standard. The maximum size allowed for the choosen paramters (ECC level={eccLevel}, EncodingMode={encodingMode}, FixedVersion={version}) is {maxSizeByte} byte."
+        )
+        { }
     }
 }

QRCoder/QRCodeGenerator.cs

@@ -131,6 +131,16 @@ public static QRCodeData GenerateQrCode(string plainText, ECCLevel eccLevel, boo
             {
                 version = GetVersion(dataInputLength+(eciMode != EciMode.Default?2:0), encoding, eccLevel);
             }
+            else
+            {
+                //Version was passed as fixed version via parameter. Thus let's check if chosen version is valid.
+                var minVersion = GetVersion(dataInputLength + (eciMode != EciMode.Default ? 2 : 0), encoding, eccLevel);
+                if (minVersion > version)
+                {
+                    var maxSizeByte = capacityTable[version - 1].Details.First(x => x.ErrorCorrectionLevel == eccLevel).CapacityDict[encoding];
+                    throw new QRCoder.Exceptions.DataTooLongException(eccLevel.ToString(), encoding.ToString(), version, maxSizeByte);
+                }                    
+            }
 
             string modeIndicator = String.Empty;
             if (eciMode != EciMode.Default)