Adding missing files

Former-commit-id: e75715cbed7b9118d9e52905b051d98915db4ef2

src/ImageProcessor/Imaging/Formats/BitmapFormat.cs

@@ -21,11 +21,11 @@ namespace ImageProcessor.Imaging.Formats
         /// <summary>
         /// Gets the file header.
         /// </summary>
-        public override byte[] FileHeader
+        public override byte[][] FileHeaders
         {
             get
             {
-                return Encoding.ASCII.GetBytes("BM");
+                return new[] { Encoding.ASCII.GetBytes("BM") };
             }
         }
 

src/ImageProcessor/Imaging/Formats/GifFormat.cs

@@ -25,11 +25,11 @@ namespace ImageProcessor.Imaging.Formats
         /// <summary>
         /// Gets the file header.
         /// </summary>
-        public override byte[] FileHeader
+        public override byte[][] FileHeaders
         {
             get
             {
-                return Encoding.ASCII.GetBytes("GIF");
+                return new[] { Encoding.ASCII.GetBytes("GIF") };
             }
         }
 

src/ImageProcessor/Imaging/Formats/JpegFormat.cs

@@ -25,11 +25,18 @@ namespace ImageProcessor.Imaging.Formats
         /// <summary>
         /// Gets the file header.
         /// </summary>
-        public override byte[] FileHeader
+        public override byte[][] FileHeaders
         {
             get
             {
-                return new byte[] { 255, 216, 255, 224 };
+                return new[]
+                           {
+                               new byte[] { 255, 216, 255, 232 },
+                               new byte[] { 255, 216, 255, 227 },
+                               new byte[] { 255, 216, 255, 226 },
+                               new byte[] { 255, 216, 255, 224 },
+                               new byte[] { 255, 216, 255, 225 }
+                           };
             }
         }
 

src/ImageProcessor/Imaging/Formats/PngFormat.cs

@@ -22,11 +22,11 @@ namespace ImageProcessor.Imaging.Formats
         /// <summary>
         /// Gets the file header.
         /// </summary>
-        public override byte[] FileHeader
+        public override byte[][] FileHeaders
         {
             get
             {
-                return new byte[] { 137, 80, 78, 71 };
+                return new[] { new byte[] { 137, 80, 78, 71 } };
             }
         }
 

src/ImageProcessor/Imaging/Formats/TiffFormat.cs

@@ -23,11 +23,11 @@ namespace ImageProcessor.Imaging.Formats
         /// <summary>
         /// Gets the file header.
         /// </summary>
-        public override byte[] FileHeader
+        public override byte[][] FileHeaders
         {
             get
             {
-                return new byte[] { 77, 77, 42 };
+                return new[] { new byte[] { 77, 77, 42 } };
             }
         }