public void GifParser_WithWikipediaExampleGifFile_YieldsExpectedElements()
{
////byte# hexadecimal text or
////(hex) value Meaning
////0: 47 49 46
//// 38 39 61 GIF89a Header
//// Logical Screen Descriptor
////6: 03 00 3 - logical screen width in pixels
////8: 05 00 5 - logical screen height in pixels
////A: F7 - GCT follows for 256 colors with resolution 3 x 8 bits/primary; the lowest 3 bits represent the bit depth minus 1, the highest true bit means that the GCT is present
////B: 00 0 - background color #0
////C: 00 - default pixel aspect ratio
//// R G B Global Color Table
////D: 00 00 00 0 0 0 - color #0 black
////10: 80 00 00 128 0 0 - color #1
//// : :
////85: 00 00 00 0 0 0 - color #40 black
//// : :
////30A: FF FF FF 255 255 255 - color #255 white
////30D: 21 F9 Graphic Control Extension (comment fields precede this in most files)
////30F: 04 4 - 4 bytes of GCE data follow
////310: 01 - there is a transparent background color (bit field; the lowest bit signifies transparency)
////311: 00 00 - delay for animation in hundredths of a second: not used
////313: 10 16 - color #16 is transparent
////314: 00 - end of GCE block
////315: 2C Image Descriptor
////316: 00 00 00 00 (0,0) - NW corner position of image in logical screen
////31A: 03 00 05 00 (3,5) - image width and height in pixels
////31E: 00 - no local color table
////31F: 08 8 Start of image - LZW minimum code size
////320: 0B 11 - 11 bytes of LZW encoded image data follow
////321: 00 51 FC 1B 28 70 A0 C1 83 01 01
////32C: 00 - end of image data
////32D: 3B GIF file terminator
var subject = new byte[]
{
0x47, 0x49, 0x46,
0x38, 0x39, 0x61,
0x03, 0x00,
0x05, 0x00,
0xF7,
0x00,
0x00,
0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF,
0x21, 0xF9,
0x04,
0x01,
0x00, 0x00,
0x10,
0x00,
0x2C,
0x00, 0x00, 0x00, 0x00,
0x03, 0x00, 0x05, 0x00,
0x00,
0x08,
0x0B,
0x00, 0x51, 0xFC, 0x1B, 0x28, 0x70, 0xA0, 0xC1, 0x83, 0x01, 0x01,
0x00,
0x3B,
};
List <GifElement> result;
using (var stream = new MemoryStream(subject))
{
result = GifParser.ReadGif(stream).ToList();
}
Assert.That(result.Count, Is.EqualTo(7));
var header = (Header)result[0];
Assert.That(header.Version, Is.EqualTo("89a"));
var logicalScreenDescriptor = (LogicalScreenDescriptor)result[1];
Assert.That(logicalScreenDescriptor.Width, Is.EqualTo(3));
Assert.That(logicalScreenDescriptor.Height, Is.EqualTo(5));
Assert.That(logicalScreenDescriptor.GlobalColorTableFlag, Is.True);
Assert.That(logicalScreenDescriptor.SizeOfGlobalColorTable, Is.EqualTo(256));
Assert.That(logicalScreenDescriptor.ColorResolution, Is.EqualTo(8));
Assert.That(logicalScreenDescriptor.BackgroundColorIndex, Is.EqualTo(0));
Assert.That(logicalScreenDescriptor.PixelAspectRatio, Is.Null);
var globalColorTable = (GlobalColorTable)result[2];
Assert.That(globalColorTable.Value.Length, Is.EqualTo(256));
Assert.That(globalColorTable.Value, Is.EqualTo(
new[] { Color.Black, Color.FromArgb(128, 0, 0) }.Concat(Enumerable.Repeat(Color.Black, 253)).Concat(new[] { Color.White }).ToArray()).Using(ColorComparer));
var graphicsControlExtension = (GraphicsControlExtension)result[3];
Assert.That(graphicsControlExtension.TransparencyFlag, Is.True);
Assert.That(graphicsControlExtension.UserInputFlag, Is.False);
Assert.That(graphicsControlExtension.DisposalMethod, Is.EqualTo(0));
Assert.That(graphicsControlExtension.DelayTime, Is.EqualTo(0));
Assert.That(graphicsControlExtension.TransparencyIndex, Is.EqualTo(16));
var imageDescriptor = (ImageDescriptor)result[4];
Assert.That(imageDescriptor.Left, Is.EqualTo(0));
Assert.That(imageDescriptor.Top, Is.EqualTo(0));
Assert.That(imageDescriptor.Width, Is.EqualTo(3));
Assert.That(imageDescriptor.Height, Is.EqualTo(5));
Assert.That(imageDescriptor.LocalColorTableFlag, Is.False);
Assert.That(imageDescriptor.SortFlag, Is.False);
Assert.That(imageDescriptor.InterlaceFlag, Is.False);
Assert.That(imageDescriptor.SizeOfLocalColorTable, Is.EqualTo(0));
var raster = (Raster)result[5];
Assert.That(raster.Value.Width, Is.EqualTo(3));
Assert.That(raster.Value.Height, Is.EqualTo(5));
Assert.That(raster.Value.GetPixel(0, 0), Is.EqualTo(Color.Black).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 0), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 0), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 1), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 1), Is.EqualTo(Color.Black).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 1), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 2), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 3), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(0, 4), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(1, 4), Is.EqualTo(Color.White).Using(ColorComparer));
Assert.That(raster.Value.GetPixel(2, 4), Is.EqualTo(Color.White).Using(ColorComparer));
var trailer = (Trailer)result[6];
}
