bool TxIndex::FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRef& tx) const
{
CDiskTxPos postx;
if (!m_db->ReadTxPos(tx_hash, postx)) {
return false;
}
CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
if (file.IsNull()) {
return error("%s: OpenBlockFile failed", __func__);
}
CBlockHeader header;
try {
file >> header;
if (fseek(file.Get(), postx.nTxOffset, SEEK_CUR)) {
return error("%s: fseek(...) failed", __func__);
}
file >> tx;
} catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
if (tx->GetHash() != tx_hash) {
return error("%s: txid mismatch", __func__);
}
block_hash = header.GetHash();
return true;
}
bool CBlockIndex::EraseBlockFromDisk()
{
// Open history file
CAutoFile fileout = OpenBlockFile(nFile, nBlockPos, "rb+");
if (!fileout)
return false;
// Overwrite with empty null block
CBlock block;
block.SetNull();
fileout << block;
return true;
}
