initial import of Monero base code

tests/difficulty/difficulty.cpp

@@ -0,0 +1,144 @@
+// Copyright (c) 2014-2023, 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 <cstddef>
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <stdexcept>
+
+#include "misc_log_ex.h"
+#include "cryptonote_config.h"
+#include "cryptonote_basic/difficulty.h"
+
+using namespace std;
+
+#define DEFAULT_TEST_DIFFICULTY_TARGET        120
+
+static int test_wide_difficulty(const char *filename)
+{
+    std::vector<uint64_t> timestamps;
+    std::vector<cryptonote::difficulty_type> cumulative_difficulties;
+    fstream data(filename, fstream::in);
+    data.exceptions(fstream::badbit);
+    data.clear(data.rdstate());
+    uint64_t timestamp;
+    cryptonote::difficulty_type difficulty, cumulative_difficulty = 0;
+    size_t n = 0;
+    while (data >> timestamp >> difficulty) {
+        size_t begin, end;
+        if (n < DIFFICULTY_WINDOW + DIFFICULTY_LAG) {
+            begin = 0;
+            end = min(n, (size_t) DIFFICULTY_WINDOW);
+        } else {
+            end = n - DIFFICULTY_LAG;
+            begin = end - DIFFICULTY_WINDOW;
+        }
+        cryptonote::difficulty_type res = cryptonote::next_difficulty(
+            std::vector<uint64_t>(timestamps.begin() + begin, timestamps.begin() + end),
+            std::vector<cryptonote::difficulty_type>(cumulative_difficulties.begin() + begin, cumulative_difficulties.begin() + end), DEFAULT_TEST_DIFFICULTY_TARGET);
+        if (res != difficulty) {
+            cerr << "Wrong wide difficulty for block " << n << endl
+                << "Expected: " << difficulty << endl
+                << "Found: " << res << endl;
+            return 1;
+        }
+        timestamps.push_back(timestamp);
+        cumulative_difficulties.push_back(cumulative_difficulty += difficulty);
+        ++n;
+    }
+    if (!data.eof()) {
+        data.clear(fstream::badbit);
+    }
+    return 0;
+}
+
+int main(int argc, char *argv[]) {
+    TRY_ENTRY();
+
+    if (argc < 2) {
+        cerr << "Wrong arguments" << endl;
+        return 1;
+    }
+    if (argc == 3 && strcmp(argv[1], "--wide") == 0)
+    {
+        return test_wide_difficulty(argv[2]);
+    }
+
+    vector<uint64_t> timestamps, cumulative_difficulties;
+    std::vector<cryptonote::difficulty_type> wide_cumulative_difficulties;
+    fstream data(argv[1], fstream::in);
+    data.exceptions(fstream::badbit);
+    data.clear(data.rdstate());
+    uint64_t timestamp;
+    uint64_t difficulty, cumulative_difficulty = 0;
+    cryptonote::difficulty_type wide_cumulative_difficulty = 0;
+    size_t n = 0;
+    while (data >> timestamp >> difficulty) {
+        size_t begin, end;
+        if (n < DIFFICULTY_WINDOW + DIFFICULTY_LAG) {
+            begin = 0;
+            end = min(n, (size_t) DIFFICULTY_WINDOW);
+        } else {
+            end = n - DIFFICULTY_LAG;
+            begin = end - DIFFICULTY_WINDOW;
+        }
+        uint64_t res = cryptonote::next_difficulty_64(
+            vector<uint64_t>(timestamps.begin() + begin, timestamps.begin() + end),
+            std::vector<uint64_t>(cumulative_difficulties.begin() + begin, cumulative_difficulties.begin() + end), DEFAULT_TEST_DIFFICULTY_TARGET);
+        if (res != difficulty) {
+            cerr << "Wrong difficulty for block " << n << endl
+                << "Expected: " << difficulty << endl
+                << "Found: " << res << endl;
+            return 1;
+        }
+        cryptonote::difficulty_type wide_res = cryptonote::next_difficulty(
+            std::vector<uint64_t>(timestamps.begin() + begin, timestamps.begin() + end),
+            std::vector<cryptonote::difficulty_type>(wide_cumulative_difficulties.begin() + begin, wide_cumulative_difficulties.begin() + end), DEFAULT_TEST_DIFFICULTY_TARGET);
+        if ((wide_res & 0xffffffffffffffff).convert_to<uint64_t>() != res) {
+            cerr << "Wrong wide difficulty for block " << n << endl
+                << "Expected: " << res << endl
+                << "Found: " << wide_res << endl;
+            return 1;
+        }
+        timestamps.push_back(timestamp);
+        cumulative_difficulties.push_back(cumulative_difficulty += difficulty);
+        wide_cumulative_difficulties.push_back(wide_cumulative_difficulty += difficulty);
+        ++n;
+    }
+    if (!data.eof()) {
+        data.clear(fstream::badbit);
+    }
+    return 0;
+
+    CATCH_ENTRY_L0("main", 1);
+}