tests: Add fuzzing harness for ISO-8601 related functions

1 files changed, 32 insertions, 0 deletions

diff --git a/src/test/fuzz/parse_iso8601.cpp b/src/test/fuzz/parse_iso8601.cpp
new file mode 100644
index 000000000..c86f8a853
--- /dev/null
+++ b/src/test/fuzz/parse_iso8601.cpp
@@ -0,0 +1,32 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <util/time.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
+
+    const int64_t random_time = fuzzed_data_provider.ConsumeIntegral<int64_t>();
+    const std::string random_string = fuzzed_data_provider.ConsumeRemainingBytesAsString();
+
+    const std::string iso8601_datetime = FormatISO8601DateTime(random_time);
+    const int64_t parsed_time_1 = ParseISO8601DateTime(iso8601_datetime);
+    if (random_time >= 0) {
+        assert(parsed_time_1 >= 0);
+        if (iso8601_datetime.length() == 20) {
+            assert(parsed_time_1 == random_time);
+        }
+    }
+
+    const int64_t parsed_time_2 = ParseISO8601DateTime(random_string);
+    assert(parsed_time_2 >= 0);
+}