Calculating CRC32 with offsets and fast

CUETools/CUETools.TestCodecs/Crc32Test.cs

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+using CUETools.Codecs;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+namespace CUETools.TestCodecs
+{
+    
+    
+    /// <summary>
+    ///This is a test class for Crc32Test and is intended
+    ///to contain all Crc32Test Unit Tests
+    ///</summary>
+	[TestClass()]
+	public class Crc32Test
+	{
+
+		private byte[] testBytes = new byte[] { 0, 0, 1, 0, 254, 255, 253, 255, 255, 127, 254, 127, 3, 128, 4, 128 };
+
+		private TestContext testContextInstance;
+
+		/// <summary>
+		///Gets or sets the test context which provides
+		///information about and functionality for the current test run.
+		///</summary>
+		public TestContext TestContext
+		{
+			get
+			{
+				return testContextInstance;
+			}
+			set
+			{
+				testContextInstance = value;
+			}
+		}
+
+		#region Additional test attributes
+		// 
+		//You can use the following additional attributes as you write your tests:
+		//
+		//Use ClassInitialize to run code before running the first test in the class
+		//[ClassInitialize()]
+		//public static void MyClassInitialize(TestContext testContext)
+		//{
+		//}
+		//
+		//Use ClassCleanup to run code after all tests in a class have run
+		//[ClassCleanup()]
+		//public static void MyClassCleanup()
+		//{
+		//}
+		//
+		//Use TestInitialize to run code before running each test
+		//[TestInitialize()]
+		//public void MyTestInitialize()
+		//{
+		//}
+		//
+		//Use TestCleanup to run code after each test has run
+		//[TestCleanup()]
+		//public void MyTestCleanup()
+		//{
+		//}
+		//
+		#endregion
+
+
+		/// <summary>
+		///A test for Combine
+		///</summary>
+		[TestMethod()]
+		public void CombineTest()
+		{
+			Crc32 crc32 = new Crc32();
+			int lenAB = testBytes.Length;
+			int lenA = 7;
+			int lenB = lenAB - lenA;
+			uint crcAB = crc32.ComputeChecksum(0, testBytes, 0, lenAB);
+			uint crcA = crc32.ComputeChecksum(0, testBytes, 0, lenA);
+			uint crcB = crc32.ComputeChecksum(0, testBytes, lenA, lenB);
+			Assert.AreEqual<uint>(crcAB, crc32.Combine(crcA, crcB, lenB), "CRC32 was not combined correctly.");
+			Assert.AreEqual<uint>(crcB, crc32.Combine(crcA, crcAB, lenB), "CRC32 was not substracted correctly.");
+		}
+
+		/// <summary>
+		///A test for ComputeChecksum
+		///</summary>
+		[TestMethod()]
+		public void ComputeChecksumTest()
+		{
+			Crc32 crc32 = new Crc32();
+			uint actual = crc32.ComputeChecksum(0xffffffff, testBytes, 0, testBytes.Length) ^ 0xffffffff;
+			Assert.AreEqual<uint>(2028688632, actual, "CRC32 was not combined correctly.");
+		}
+	}
+}