Method Read

library/cpp/netliba/v6/block_chain.h:82–106

        {
        }
        void Read(void* dst, int sz) {
            char* dstBuf = (char*)dst;
            while (sz > 0) {
                if (BlockId >= Chain.GetBlockCount()) {
                    // JACKPOT!
                    fprintf(stderr, "reading beyond chain end: BlockId %d, Chain.GetBlockCount() %d, Pos %d, BlockPos %d\n",
                            BlockId, Chain.GetBlockCount(), Pos, BlockPos);
                    Y_ASSERT(0 && "reading beyond chain end");
                    memset(dstBuf, 0, sz);
                    Failed = true;
                    return;
                }
                const TBlockChain::TBlock& blk = Chain.GetBlock(BlockId);
                int copySize = Min(blk.Size - BlockPos, sz);
                memcpy(dstBuf, blk.Data + BlockPos, copySize);
                dstBuf += copySize;
                Pos += copySize;
                BlockPos += copySize;
                sz -= copySize;
                if (BlockPos == blk.Size) {
                    BlockPos = 0;
                    ++BlockId;
                }
            }
        }
        void Seek(int pos) {
            if (pos < 0 || pos > Chain.GetSize()) {
                Y_ASSERT(0);