Method FindBlockPos

src/node/blockstorage.cpp:627–680

}

bool BlockManager::FindBlockPos(FlatFilePos& pos, unsigned int nAddSize, unsigned int nHeight, CChain& active_chain, uint64_t nTime, bool fKnown)
{
    LOCK(cs_LastBlockFile);

    unsigned int nFile = fKnown ? pos.nFile : m_last_blockfile;
    if (m_blockfile_info.size() <= nFile) {
        m_blockfile_info.resize(nFile + 1);
    }

    bool finalize_undo = false;
    if (!fKnown) {
        while (m_blockfile_info[nFile].nSize + nAddSize >= (gArgs.GetBoolArg("-fastprune", false) ? 0x10000 /* 64kb */ : MAX_BLOCKFILE_SIZE)) {
            // when the undo file is keeping up with the block file, we want to flush it explicitly
            // when it is lagging behind (more blocks arrive than are being connected), we let the
            // undo block write case handle it
            finalize_undo = (m_blockfile_info[nFile].nHeightLast == (unsigned int)active_chain.Tip()->nHeight);
            nFile++;
            if (m_blockfile_info.size() <= nFile) {
                m_blockfile_info.resize(nFile + 1);
            }
        }
        pos.nFile = nFile;
        pos.nPos = m_blockfile_info[nFile].nSize;
    }

    if ((int)nFile != m_last_blockfile) {
        if (!fKnown) {
            LogPrint(BCLog::BLOCKSTORE, "Leaving block file %i: %s\n", m_last_blockfile, m_blockfile_info[m_last_blockfile].ToString());
        }
        FlushBlockFile(!fKnown, finalize_undo);
        m_last_blockfile = nFile;
    }

    m_blockfile_info[nFile].AddBlock(nHeight, nTime);
    if (fKnown) {
        m_blockfile_info[nFile].nSize = std::max(pos.nPos + nAddSize, m_blockfile_info[nFile].nSize);
    } else {
        m_blockfile_info[nFile].nSize += nAddSize;
    }

    if (!fKnown) {
        bool out_of_space;
        size_t bytes_allocated = BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
        if (out_of_space) {
            return AbortNode("Disk space is too low!", _("Disk space is too low!"));
        }
        if (bytes_allocated != 0 && fPruneMode) {
            m_check_for_pruning = true;
        }
    }

    m_dirty_fileinfo.insert(nFile);
    return true;
}

bool BlockManager::FindUndoPos(BlockValidationState& state, int nFile, FlatFilePos& pos, unsigned int nAddSize)
{