ArrayRef-ize MD5 and clean up a few variable names.

Add a stringize method to make dumping a bit easier, and add a testcase
exercising a few different paths.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182692 91177308-0d34-0410-b5e6-96231b3b80d8

unittests/Support/MD5Test.cpp

@@ -0,0 +1,42 @@
+//===- llvm/unittest/Support/MD5Test.cpp - MD5 tests ----------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements unit tests for the MD5 functions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/MD5.h"
+#include "gtest/gtest.h"
+
+using namespace llvm;
+
+namespace {
+void TestMD5Sum(ArrayRef<unsigned char> Input, StringRef Final) {
+  MD5 Hash;
+  Hash.update(Input);
+  MD5::MD5Result MD5Res;
+  Hash.final(MD5Res);
+  SmallString<32> Res;
+  MD5::stringifyResult(MD5Res, Res);
+  EXPECT_EQ(Res, Final);
+}
+
+TEST(MD5Test, MD5) {
+  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"", (size_t) 0),
+             "d41d8cd98f00b204e9800998ecf8427e");
+  TestMD5Sum(ArrayRef<unsigned char>((const unsigned char *)"a", (size_t) 1),
+             "0cc175b9c0f1b6a831c399e269772661");
+  TestMD5Sum(ArrayRef<unsigned char>(
+                 (const unsigned char *)"abcdefghijklmnopqrstuvwxyz",
+                 (size_t) 26),
+             "c3fcd3d76192e4007dfb496cca67e13b");
+}
+}