[Mono.Debugging] Improved source checksum logic for UNIX and DOS line endings

Since it is possible that the assemblies being debugged could have
been compiled on a different system (potentially with different line
endings), compute hashes for the source code in 3 formats:

1. The source code file with line endings as-is
2. The source code file with DOS line endings
3. The source code file with UNIX line endings

Note: sometimes source code may have mixed line endings, so it is
important to calculate the source code as-is and not just
canonicalized UNIX and DOS line endings.

Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/642329
Fixes issue #5260

1 files changed, 99 insertions, 0 deletions

diff --git a/UnitTests/Mono.Debugging.Tests/Shared/SourceLocationTests.cs b/UnitTests/Mono.Debugging.Tests/Shared/SourceLocationTests.cs
new file mode 100644
index 0000000..9da44cd
--- /dev/null
+++ b/UnitTests/Mono.Debugging.Tests/Shared/SourceLocationTests.cs
@@ -0,0 +1,99 @@
+//
+// SourceLocationTests.cs
+//
+// Author:
+//       Jeffrey Stedfast <jestedfa@microsoft.com>
+//
+// Copyright (c) 2019 Microsoft Corp.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+using System.IO;
+using System.Text;
+using System.Security.Cryptography;
+
+using Mono.Debugging.Client;
+
+using NUnit.Framework;
+
+namespace Mono.Debugging.Tests
+{
+	[TestFixture]
+	public class SourceLocationTests
+	{
+		static void TestCheckFileHash (string algorithm, string text, string mode)
+		{
+			var buffer = Encoding.ASCII.GetBytes (text);
+
+			using (var hash = HashAlgorithm.Create (algorithm)) {
+				var checksum = hash.ComputeHash (buffer);
+				string tmp;
+
+				tmp = Path.GetTempFileName ();
+				File.WriteAllBytes (tmp, buffer);
+
+				Assert.IsTrue (SourceLocation.CheckFileHash (tmp, checksum), "CheckFileHash {0} ({1})", algorithm, mode);
+
+				if (checksum.Length > 16) {
+					var roslyn = new byte[16];
+
+					roslyn[0] = (byte) checksum.Length;
+					for (int i = 1; i < 16; i++)
+						roslyn[i] = checksum[i - 1];
+
+					Assert.IsTrue (SourceLocation.CheckFileHash (tmp, checksum), "CheckFileHash Roslyn {0} ({1})", algorithm, mode);
+				}
+			}
+		}
+
+		static void TestCheckFileHash (string algorithm)
+		{
+			string text = "This is line 1.\nThis is line 2.\r\nThis is line 3.\r\nThis is line 4.\nThis is line 5.\n";
+
+			TestCheckFileHash (algorithm, text, "MIXED");
+
+			text = text.Replace ("\r\n", "\n");
+
+			TestCheckFileHash (algorithm, text, "UNIX");
+
+			text = text.Replace ("\n", "\r\n");
+
+			TestCheckFileHash (algorithm, text, "DOS");
+		}
+
+		[Test]
+		public void TestCheckFileHashSha1 ()
+		{
+			TestCheckFileHash ("SHA1");
+		}
+
+		[Test]
+		public void TestCheckFileHashSha256 ()
+		{
+			TestCheckFileHash ("SHA256");
+		}
+
+		[Test]
+		public void TestCheckFileHashMd5 ()
+		{
+			TestCheckFileHash ("MD5");
+		}
+	}
+}