// Copyright (c) 2012-2018 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 <streams.h>
#include <support/allocators/zeroafterfree.h>
#include <test/test_bitcoin.h>

#include <boost/test/unit_test.hpp>

BOOST_FIXTURE_TEST_SUITE(streams_tests, BasicTestingSetup)

BOOST_AUTO_TEST_CASE(streams_vector_writer)
{
    unsigned char a(1);
    unsigned char b(2);
    unsigned char bytes[] = { 3, 4, 5, 6 };
    std::vector<unsigned char> vch;

    // Each test runs twice. Serializing a second time at the same starting
    // point should yield the same results, even if the first test grew the
    // vector.

    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 0, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{1, 2}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 0, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{1, 2}}));
    vch.clear();

    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 1, 2}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 1, 2}}));
    vch.clear();

    vch.resize(5, 0);
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 1, 2, 0}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 1, 2, 0}}));
    vch.clear();

    vch.resize(4, 0);
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 3, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 0, 1, 2}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 3, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 0, 1, 2}}));
    vch.clear();

    vch.resize(4, 0);
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 4, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 0, 0, 1, 2}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 4, a, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{0, 0, 0, 0, 1, 2}}));
    vch.clear();

    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 0, bytes);
    BOOST_CHECK((vch == std::vector<unsigned char>{{3, 4, 5, 6}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 0, bytes);
    BOOST_CHECK((vch == std::vector<unsigned char>{{3, 4, 5, 6}}));
    vch.clear();

    vch.resize(4, 8);
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, bytes, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{8, 8, 1, 3, 4, 5, 6, 2}}));
    CVectorWriter(SER_NETWORK, INIT_PROTO_VERSION, vch, 2, a, bytes, b);
    BOOST_CHECK((vch == std::vector<unsigned char>{{8, 8, 1, 3, 4, 5, 6, 2}}));
    vch.clear();
}

BOOST_AUTO_TEST_CASE(streams_serializedata_xor)
{
    std::vector<char> in;
    std::vector<char> expected_xor;
    std::vector<unsigned char> key;
    CDataStream ds(in, 0, 0);

    // Degenerate case

    key.push_back('\x00');
    key.push_back('\x00');
    ds.Xor(key);
    BOOST_CHECK_EQUAL(
            std::string(expected_xor.begin(), expected_xor.end()),
            std::string(ds.begin(), ds.end()));

    in.push_back('\x0f');
    in.push_back('\xf0');
    expected_xor.push_back('\xf0');
    expected_xor.push_back('\x0f');

    // Single character key

    ds.clear();
    ds.insert(ds.begin(), in.begin(), in.end());
    key.clear();

    key.push_back('\xff');
    ds.Xor(key);
    BOOST_CHECK_EQUAL(
            std::string(expected_xor.begin(), expected_xor.end()),
            std::string(ds.begin(), ds.end()));

    // Multi character key

    in.clear();
    expected_xor.clear();
    in.push_back('\xf0');
    in.push_back('\x0f');
    expected_xor.push_back('\x0f');
    expected_xor.push_back('\x00');

    ds.clear();
    ds.insert(ds.begin(), in.begin(), in.end());

    key.clear();
    key.push_back('\xff');
    key.push_back('\x0f');

    ds.Xor(key);
    BOOST_CHECK_EQUAL(
            std::string(expected_xor.begin(), expected_xor.end()),
            std::string(ds.begin(), ds.end()));
}

BOOST_AUTO_TEST_SUITE_END()
