Add ByteConvertTest.

MetadataExtractor.Tests/MetadataExtractor.Tests.csproj

@@ -68,6 +68,7 @@
     <Compile Include="Formats\Png\PngMetadataReaderTest.cs" />
     <Compile Include="IO\ByteArrayReaderTest.cs" />
     <Compile Include="UseCultureAttribute.cs" />
+    <Compile Include="Util\ByteConvertTest.cs" />
     <Compile Include="Util\ByteTrieTest.cs" />
     <Compile Include="GeoLocationTest.cs" />
     <Compile Include="IO\IndexedSeekingReaderTest.cs" />

MetadataExtractor.Tests/Util/ByteConvertTest.cs

@@ -0,0 +1,48 @@
+#region License
+
+//
+// Copyright 2002-2015 Drew Noakes
+// Ported from Java to C# by Yakov Danilov for Imazen LLC in 2014
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+// More information about this project is available at:
+//
+//    https://github.com/drewnoakes/metadata-extractor-dotnet
+//    https://drewnoakes.com/code/exif/
+//
+
+#endregion
+
+using MetadataExtractor.Util;
+using Xunit;
+
+namespace MetadataExtractor.Tests.Util
+{
+    public class ByteConvertTest
+    {
+        [Fact]
+        public void ToInt32BigEndian()
+        {
+            Assert.Equal(0x01020304, ByteConvert.ToInt32BigEndian(new byte[] { 1, 2, 3, 4 }));
+            Assert.Equal(0x01020304, ByteConvert.ToInt32BigEndian(new byte[] { 1, 2, 3, 4, 5 }));
+        }
+
+        [Fact]
+        public void ToInt32LittleEndian()
+        {
+            Assert.Equal(0x04030201, ByteConvert.ToInt32LittleEndian(new byte[] { 1, 2, 3, 4 }));
+            Assert.Equal(0x04030201, ByteConvert.ToInt32LittleEndian(new byte[] { 1, 2, 3, 4, 5 }));
+        }
+    }
+}

MetadataExtractor/Util/ByteConvert.cs

@@ -2,7 +2,7 @@
 
 namespace MetadataExtractor.Util
 {
-    internal static class ByteConvert
+    public static class ByteConvert
     {
         [Pure]
         public static int ToInt32BigEndian([NotNull] byte[] bytes)