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CBlock::BuildMerkleTree
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CBlock::BuildMerkleTree() | |
{ | |
uint256 BuildMerkleTree() const | |
{ | |
vMerkleTree.clear(); | |
// 각 트랜잭션들의 해시값을 따로 저장하여 vMerkleTree 생성 | |
foreach(const CTransaction& tx, vtx) | |
vMerkleTree.push_back(tx.GetHash()); | |
int j = 0; | |
for (int nSize = vtx.size(); nSize > 1; nSize = (nSize + 1) / 2) | |
{ | |
for (int i = 0; i < nSize; i += 2) | |
{ | |
// 만약 트랜잭션이 짝수개가 아니라면, 마지막 트랜잭션의 해시는 자기 자신과 해시 | |
int i2 = min(i+1, nSize-1); | |
// 트랜잭션의 해시를 2개씩 묶어서 다시 머클트리에 삽입한다. | |
vMerkleTree.push_back(Hash(BEGIN(vMerkleTree[j+i]), END(vMerkleTree[j+i]), | |
BEGIN(vMerkleTree[j+i2]), END(vMerkleTree[j+i2]))); | |
} | |
// j는 각 트리레벨에 맞춰 삽입해야할 첫번째 위치를 가리킨다. | |
j += nSize; | |
} | |
return (vMerkleTree.empty() ? 0 : vMerkleTree.back()); | |
} | |
} |
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