// Copyright (c) 2009-2018 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 <checkpoints.h>

#include <chain.h>

#include <chainparams.h>

#include <reverse_iterator.h>

#include <validation.h>

#include <stdint.h>

namespace Checkpoints {

CBlockIndex* GetLastCheckpoint(const CCheckpointData& data)

{

const MapCheckpoints& checkpoints = data.mapCheckpoints;

for (const MapCheckpoints::value_type& i : reverse_iterate(checkpoints))

{

const uint256& hash = i.second;

CBlockIndex* pindex = LookupBlockIndex(hash);

if (pindex) {

return pindex;

}

}

return nullptr;

}

// FXTC BEGIN

bool IsExpectedCheckpoint(const CCheckpointData& data, int nHeight, const uint256& hash)

{

const MapCheckpoints& checkpoints = data.mapCheckpoints;

for (const MapCheckpoints::value_type& i : reverse_iterate(checkpoints))

{

// valid if block itself is checkpoint

if (i.first == nHeight)

return (i.second == hash);

// valid if block is above checkpoint

if (i.first < nHeight)

return (mapBlockIndex.find(i.second) != mapBlockIndex.end());

}

// valid if there are no checkpoints

return true;

}

// FXTC END

} // namespace Checkpoints