1 files changed, 64 insertions, 0 deletions
diff --git a/MdePkg/Test/GoogleTest/Library/BaseLib/TestCheckSum.cpp b/MdePkg/Test/GoogleTest/Library/BaseLib/TestCheckSum.cpp
new file mode 100644
index 0000000000..1f4f73a88b
--- /dev/null
+++ b/MdePkg/Test/GoogleTest/Library/BaseLib/TestCheckSum.cpp
@@ -0,0 +1,64 @@
+/** @file
+  Unit tests for BaseLib's checksum capabilities.
+
+  Copyright (c) 2023 Pedro Falcato. All rights reserved<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <gtest/gtest.h>
+extern "C" {
+  #include <Base.h>
+  #include <Library/BaseLib.h>
+}
+
+// Precomputed crc32c and crc16-ansi for "hello" (without the null byte)
+constexpr STATIC UINT32  mHelloCrc32c = 0x9A71BB4C;
+constexpr STATIC UINT16  mHelloCrc16  = 0x34F6;
+
+TEST (Crc32c, BasicCheck) {
+  // Note: The magic numbers below are precomputed checksums
+  // Check for basic operation on even and odd numbers of bytes
+  EXPECT_EQ (CalculateCrc32c ("hello", 5, 0), mHelloCrc32c);
+  EXPECT_EQ (
+    CalculateCrc32c ("longlonglonglonglong", sizeof ("longlonglonglonglong") - 1, 0),
+    0xC50F869D
+    );
+  EXPECT_EQ (CalculateCrc32c ("h", 1, 0), 0xB96298FC);
+
+  // Check if a checksum with no bytes correctly yields 0
+  EXPECT_EQ (CalculateCrc32c ("", 0, 0), 0U);
+}
+
+TEST (Crc32c, MultipartCheck) {
+  // Test multi-part crc32c calculation. So that given a string of bytes
+  // s[N], crc32c(s, N, 0) == crc32c(s[N - 1], 1, crc32c(s, N - 1, 0))
+  // and all other sorts of combinations one might imagine.
+  UINT32  val;
+
+  val = CalculateCrc32c ("hel", 3, 0);
+  EXPECT_EQ (CalculateCrc32c (&"hello"[3], 2, val), mHelloCrc32c);
+}
+
+TEST (Crc16, BasicCheck) {
+  // Note: The magic numbers below are precomputed checksums
+  // Check for basic operation on even and odd numbers of bytes
+  EXPECT_EQ (CalculateCrc16Ansi ("hello", 5, CRC16ANSI_INIT), mHelloCrc16);
+  EXPECT_EQ (
+    CalculateCrc16Ansi ("longlonglonglonglong", sizeof ("longlonglonglonglong") - 1, CRC16ANSI_INIT),
+    0xF723
+    );
+  EXPECT_EQ (CalculateCrc16Ansi ("h", 1, CRC16ANSI_INIT), 0xAEBE);
+
+  // Check if a checksum with no bytes correctly yields CRC16ANSI_INIT
+  EXPECT_EQ (CalculateCrc16Ansi ("", 0, CRC16ANSI_INIT), CRC16ANSI_INIT);
+}
+
+TEST (Crc16, MultipartCheck) {
+  // Test multi-part crc16 calculation. So that given a string of bytes
+  // s[N], crc16(s, N, 0) == crc16(s[N - 1], 1, crc16(s, N - 1, 0))
+  // and all other sorts of combinations one might imagine.
+  UINT16  val;
+
+  val = CalculateCrc16Ansi ("hel", 3, CRC16ANSI_INIT);
+  EXPECT_EQ (CalculateCrc16Ansi (&"hello"[3], 2, val), mHelloCrc16);
+}