Add unit tests for CRC64.

tests/crc64.cpp

@@ -0,0 +1,81 @@
+//
+// Created by claunia on 5/10/21.
+//
+
+#include <cstdint>
+
+#include "../library.h"
+#include "../crc64.h"
+#include "gtest/gtest.h"
+
+#define EXPECTED_CRC64 0xbf09992cc5ede38e
+
+static const uint8_t* buffer;
+
+class crc64Fixture : public ::testing::Test
+{
+  public:
+    crc64Fixture()
+    {
+        // initialization;
+        // can also be done in SetUp()
+    }
+
+  protected:
+    void SetUp()
+    {
+        FILE* file = fopen("/home/claunia/random", "rb");
+        buffer     = (const uint8_t*)malloc(1048576);
+        fread((void*)buffer, 1, 1048576, file);
+        fclose(file);
+    }
+
+    void TearDown() { free((void*)buffer); }
+
+    ~crc64Fixture()
+    {
+        // resources cleanup, no exceptions allowed
+    }
+
+    // shared user data
+};
+
+TEST_F(crc64Fixture, crc64_auto)
+{
+    crc64_ctx* ctx = crc64_init();
+    uint64_t   crc;
+
+    EXPECT_NE(ctx, nullptr);
+
+    crc64_update(ctx, buffer, 1048576);
+    crc64_final(ctx, &crc);
+
+    EXPECT_EQ(crc, EXPECTED_CRC64);
+}
+
+TEST_F(crc64Fixture, crc64_slicing)
+{
+    uint64_t crc = CRC64_ECMA_SEED;
+
+    crc64_slicing(&crc, buffer, 1048576);
+
+    crc ^= CRC64_ECMA_SEED;
+
+    EXPECT_EQ(crc, EXPECTED_CRC64);
+}
+
+#if defined(__x86_64__) || defined(__amd64) || defined(_M_AMD64) || defined(_M_X64) || defined(__I386__) ||            \
+    defined(__i386__) || defined(__THW_INTEL) || defined(_M_IX86)
+TEST_F(crc64Fixture, crc64_clmul)
+{
+    if(!have_clmul()) return;
+
+    uint64_t crc = CRC64_ECMA_SEED;
+
+    crc = ~crc64_clmul(~crc, buffer, 1048576);
+
+    crc ^= CRC64_ECMA_SEED;
+
+    EXPECT_EQ(crc, EXPECTED_CRC64);
+}
+#endif