Method CheckBlockDataAvailability

src/node/blockstorage.cpp:653–665

}

bool BlockManager::CheckBlockDataAvailability(const CBlockIndex& upper_block, const CBlockIndex& lower_block, BlockStatus block_status)
{
    if (!(upper_block.nStatus & block_status)) return false;
    const auto& first_block = GetFirstBlock(upper_block, block_status, &lower_block);
    // Special case: the genesis block has no undo data
    if (block_status & BLOCK_HAVE_UNDO && lower_block.nHeight == 0 && first_block.nHeight == 1) {
        // This might indicate missing data, or it could simply reflect the expected absence of undo data for the genesis block.
        // To distinguish between the two, check if all required block data *except* undo is available up to the genesis block.
        BlockStatus flags{block_status & ~BLOCK_HAVE_UNDO};
        return first_block.pprev && first_block.pprev->nStatus & flags;
    }
    return &first_block == &lower_block;
}

// If we're using -prune with -reindex, then delete block files that will be ignored by the
// reindex.  Since reindexing works by starting at block file 0 and looping until a blockfile