unit_tests: add a write_varint/read_varint test

tests/unit_tests/CMakeLists.txt

@@ -50,7 +50,8 @@ set(unit_tests_sources
   test_peerlist.cpp
   test_protocol_pack.cpp
   hardfork.cpp
-  unbound.cpp)
+  unbound.cpp
+  varint.cpp)
 
 set(unit_tests_headers
   unit_tests_utils.h)

tests/unit_tests/varint.cpp

@@ -0,0 +1,66 @@
+// Copyright (c) 2014-2016, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+// 
+// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
+
+#include <cstring>
+#include <cstdint>
+#include <cstdio>
+#include <iostream>
+#include <vector>
+#include <boost/foreach.hpp>
+#include "cryptonote_core/cryptonote_basic.h"
+#include "cryptonote_core/cryptonote_basic_impl.h"
+#include "serialization/serialization.h"
+#include "serialization/binary_archive.h"
+#include "serialization/json_archive.h"
+#include "serialization/debug_archive.h"
+#include "serialization/variant.h"
+#include "serialization/vector.h"
+#include "serialization/binary_utils.h"
+#include "gtest/gtest.h"
+using namespace std;
+
+TEST(varint, equal)
+{
+  for (uint64_t idx = 0; idx < 65537; ++idx)
+  {
+    char buf[12];
+    char *bufptr = buf;
+    tools::write_varint(bufptr, idx);
+    uint64_t bytes = bufptr - buf;
+    ASSERT_TRUE (bytes > 0 && bytes <= sizeof(buf));
+
+    uint64_t idx2;
+    bufptr = buf;
+    std::string s(buf, bytes);
+    int read = tools::read_varint(s.begin(), s.end(), idx2);
+    ASSERT_EQ (read, bytes);
+    ASSERT_TRUE(idx2 == idx);
+  }
+}