From bcad0144eff3192cb54f65fa7737be53e03f8b0f Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Thu, 19 Dec 2019 19:26:42 +0000
Subject: tests: Add fuzzing harness for DecodeHexTx(...)

---
 src/test/fuzz/decode_tx.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 src/test/fuzz/decode_tx.cpp

(limited to 'src/test/fuzz/decode_tx.cpp')

diff --git a/src/test/fuzz/decode_tx.cpp b/src/test/fuzz/decode_tx.cpp
new file mode 100644
index 000000000..09c4ff05d
--- /dev/null
+++ b/src/test/fuzz/decode_tx.cpp
@@ -0,0 +1,31 @@
+// 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 <core_io.h>
+#include <primitives/transaction.h>
+#include <test/fuzz/fuzz.h>
+#include <util/strencodings.h>
+
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string tx_hex = HexStr(std::string{buffer.begin(), buffer.end()});
+    CMutableTransaction mtx;
+    const bool result_none = DecodeHexTx(mtx, tx_hex, false, false);
+    const bool result_try_witness = DecodeHexTx(mtx, tx_hex, false, true);
+    const bool result_try_witness_and_maybe_no_witness = DecodeHexTx(mtx, tx_hex, true, true);
+    const bool result_try_no_witness = DecodeHexTx(mtx, tx_hex, true, false);
+    assert(!result_none);
+    if (result_try_witness_and_maybe_no_witness) {
+        assert(result_try_no_witness || result_try_witness);
+    }
+    // if (result_try_no_witness) { // Uncomment when https://github.com/bitcoin/bitcoin/pull/17775 is merged
+    if (result_try_witness) { // Remove stop-gap when https://github.com/bitcoin/bitcoin/pull/17775 is merged
+        assert(result_try_witness_and_maybe_no_witness);
+    }
+}
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