Better checksum tests

tests/ImageSharp.Tests/Formats/Png/Adler32Tests.cs

@@ -0,0 +1,41 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the GNU Affero General Public License, Version 3.
+
+using System;
+using SixLabors.ImageSharp.Formats.Png.Zlib;
+using Xunit;
+using SharpAdler32 = ICSharpCode.SharpZipLib.Checksum.Adler32;
+
+namespace SixLabors.ImageSharp.Tests.Formats.Png
+{
+    public class Adler32Tests
+    {
+        [Theory]
+        [InlineData(0)]
+        [InlineData(8)]
+        [InlineData(215)]
+        [InlineData(1024)]
+        [InlineData(1024 + 15)]
+        [InlineData(2034)]
+        [InlineData(4096)]
+        public void MatchesReference(int length)
+        {
+            var data = GetBuffer(length);
+            var adler = new SharpAdler32();
+            adler.Update(data);
+
+            long expected = adler.Value;
+            long actual = Adler32.Calculate(data);
+
+            Assert.Equal(expected, actual);
+        }
+
+        private static byte[] GetBuffer(int length)
+        {
+            var data = new byte[length];
+            new Random(1).NextBytes(data);
+
+            return data;
+        }
+    }
+}

tests/ImageSharp.Tests/Formats/Png/Crc32Tests.cs

@@ -0,0 +1,41 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the GNU Affero General Public License, Version 3.
+
+using System;
+using SixLabors.ImageSharp.Formats.Png.Zlib;
+using Xunit;
+using SharpCrc32 = ICSharpCode.SharpZipLib.Checksum.Crc32;
+
+namespace SixLabors.ImageSharp.Tests.Formats.Png
+{
+    public class Crc32Tests
+    {
+        [Theory]
+        [InlineData(0)]
+        [InlineData(8)]
+        [InlineData(215)]
+        [InlineData(1024)]
+        [InlineData(1024 + 15)]
+        [InlineData(2034)]
+        [InlineData(4096)]
+        public void MatchesReference(int length)
+        {
+            var data = GetBuffer(length);
+            var crc = new SharpCrc32();
+            crc.Update(data);
+
+            long expected = crc.Value;
+            long actual = Crc32.Calculate(data);
+
+            Assert.Equal(expected, actual);
+        }
+
+        private static byte[] GetBuffer(int length)
+        {
+            var data = new byte[length];
+            new Random(1).NextBytes(data);
+
+            return data;
+        }
+    }
+}

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.Chunks.cs

@@ -83,57 +83,6 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             }
         }
 
-        [Fact]
-        public void CalculateCrc_Works_LongerRun()
-        {
-            // Longer run, enough to require moving the point in SIMD implementation with
-            // offset for dropping back to scalar.
-            var data = new byte[]
-            {
-                0, 1, 2, 3, 4, 5, 6, 7, 8,
-                9, 10, 11, 12, 13, 14, 15, 16,
-                17, 18, 19, 20, 21, 22, 23, 24,
-                25, 26, 27, 28, 29, 30, 31, 32,
-                33, 34, 35, 36, 37, 38, 39, 40,
-                41, 42, 43, 44, 45, 46, 47, 48,
-                49, 50, 51, 52, 53, 54, 55, 56,
-                57, 58, 59, 60, 61, 62, 63, 64,
-                65, 66, 67, 68, 69, 70, 71, 72,
-                73, 74, 75, 76, 77, 78, 79, 80,
-                81, 82, 83, 84, 85, 86, 87, 88,
-                89, 90, 91, 92, 93, 94, 95, 96,
-                97, 98, 99, 100, 101, 102, 103, 104,
-                105, 106, 107, 108, 109, 110, 111, 112,
-                113, 114, 115, 116, 117, 118, 119, 120,
-                121, 122, 123, 124, 125, 126, 127, 128,
-                129, 130, 131, 132, 133, 134, 135, 136,
-                137, 138, 139, 140, 141, 142, 143, 144,
-                145, 146, 147, 148, 149, 150, 151, 152,
-                153, 154, 155, 156, 157, 158, 159, 160,
-                161, 162, 163, 164, 165, 166, 167, 168,
-                169, 170, 171, 172, 173, 174, 175, 176,
-                177, 178, 179, 180, 181, 182, 183, 184,
-                185, 186, 187, 188, 189, 190, 191, 192,
-                193, 194, 195, 196, 197, 198, 199, 200,
-                201, 202, 203, 204, 205, 206, 207, 208,
-                209, 210, 211, 212, 213, 214, 215
-            };
-
-            // assert
-            uint crc = Crc32.Calculate(data);
-            Assert.Equal(0xC1125402, crc);
-        }
-
-        [Fact]
-        public void CalculateCrc_Works()
-        {
-            // Short run, less than 64.
-            var data = new byte[] { 0, 1, 2, 3, 4, 5, 6, 7 };
-            uint crc = Crc32.Calculate(data);
-
-            Assert.Equal(0x88AA689F, crc);
-        }
-
         private static string GetChunkTypeName(uint value)
         {
             var data = new byte[4];

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -21,6 +21,7 @@
     <PackageReference Include="Magick.NET-Q16-AnyCPU" />
     <PackageReference Include="Microsoft.DotNet.RemoteExecutor" />
     <PackageReference Include="Moq" />
+    <PackageReference Include="SharpZipLib"  />
     <PackageReference Include="System.Drawing.Common" />
   </ItemGroup>