Merge pull request #56 from hgy59/gpsversion_only

Gpsversion fixed

Author: oozcitak

ExifLibrary/ExifExtendedProperty.cs

@@ -148,7 +148,7 @@ public override ExifInterOperability Interoperability
 
     /// <summary>
     /// Represents the exif version as a 4 byte ASCII string. (EXIF Specification: UNDEFINED) 
-    /// Used for the ExifVersion, FlashpixVersion, InteroperabilityVersion and GPSVersionID fields.
+    /// Used for the ExifVersion, FlashpixVersion and InteroperabilityVersion fields.
     /// </summary>
     public class ExifVersion : ExifProperty
     {
@@ -189,6 +189,28 @@ public override ExifInterOperability Interoperability
         }
     }
 
+    /// <summary>
+    /// Represents a version as a 4 byte byte array. (Specification: int8u[4]) 
+    /// Used for the GPSVersionID field.
+    /// </summary>
+    public class VersionID : ExifByteArray
+    {
+        public VersionID(ExifTag tag, byte [] value)
+            : base(tag, value)
+        {
+        }
+
+        public override string ToString()
+        {
+            StringBuilder sb = new StringBuilder();
+            foreach (var b in Value)
+            {
+                sb.Append(b).Append('.');
+            }
+            return sb.ToString().TrimEnd('.');
+        }
+    }
+
     /// <summary>
     /// Represents the location and area of the subject (EXIF Specification: 2xSHORT)
     /// The coordinate values, width, and height are expressed in relation to the 

ExifLibrary/ExifPropertyFactory.cs

@@ -134,7 +134,7 @@ public static ExifProperty Get(ushort tag, ushort type, uint count, byte[] value
             else if (ifd == IFD.GPS)
             {
                 if (tag == 0) // GPSVersionID
-                    return new ExifVersion(ExifTag.GPSVersionID, ExifBitConverter.ToString(value));
+                    return new VersionID(ExifTag.GPSVersionID, value);
                 else if (tag == 1) // GPSLatitudeRef
                     return new ExifEnumProperty<GPSLatitudeRef>(ExifTag.GPSLatitudeRef, (GPSLatitudeRef)value[0]);
                 else if (tag == 2) // GPSLatitude