// Copyright (c) 2012-2017 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/assign/std/vector.hpp> // for 'operator+=()'
#include <boost/test/unit_test.hpp>

using namespace boost::assign; // bring 'operator+=()' into scope

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

    in += '\x0f';
    in += '\xf0';
    expected_xor += '\xf0';
    expected_xor += '\x0f';
    
    // Single character key

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

    key += '\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 += '\xf0';
    in += '\x0f';
    expected_xor += '\x0f';
    expected_xor += '\x00';
                        
    ds.clear();
    ds.insert(ds.begin(), in.begin(), in.end());

    key.clear();
    key += '\xff';
    key += '\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()