intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 74 insertions, 0 deletions

diff --git a/library/cpp/digest/old_crc/crc_ut.cpp b/library/cpp/digest/old_crc/crc_ut.cpp
new file mode 100644
index 0000000000..46e1d5d29b
--- /dev/null
+++ b/library/cpp/digest/old_crc/crc_ut.cpp
@@ -0,0 +1,74 @@
+#include "crc.h"
+
+#include <library/cpp/testing/unittest/registar.h>
+
+#include <util/stream/output.h>
+
+class TCrcTest: public TTestBase {
+    UNIT_TEST_SUITE(TCrcTest);
+    UNIT_TEST(TestCrc16)
+    UNIT_TEST(TestCrc32)
+    UNIT_TEST(TestCrc64)
+    UNIT_TEST_SUITE_END();
+
+private:
+    inline void TestCrc16() {
+        const ui16 expected[] = {
+            41719,
+            57001,
+            53722,
+            3276};
+
+        Run<ui16>(expected);
+    }
+
+    inline void TestCrc32() {
+        const ui32 expected[] = {
+            688229491UL,
+            3543112608UL,
+            4127534015UL,
+            3009909774UL};
+
+        Run<ui32>(expected);
+    }
+
+    inline void TestCrc64() {
+        const ui64 expected[] = {
+            12116107829328640258ULL,
+            18186277744016380552ULL,
+            249923753044811734ULL,
+            7852471725963920356ULL};
+
+        Run<ui64>(expected);
+    }
+
+private:
+    template <class T>
+    inline void Run(const T* expected) {
+        ui8 buf[256];
+
+        for (size_t i = 0; i < 256; ++i) {
+            buf[i] = i;
+        }
+
+        Test<T>(buf, 256, expected[0]);
+        Test<T>(buf, 255, expected[1]);
+        Test<T>(buf, 254, expected[2]);
+        Test<T>(buf, 253, expected[3]);
+    }
+
+    template <class T>
+    inline void Test(const void* data, size_t len, T expected) {
+        const T res = Crc<T>(data, len);
+
+        try {
+            UNIT_ASSERT_EQUAL(res, expected);
+        } catch (...) {
+            Cerr << res << Endl;
+
+            throw;
+        }
+    }
+};
+
+UNIT_TEST_SUITE_REGISTRATION(TCrcTest);