Method Pack

library/cpp/containers/comptrie/writeable_node.cpp:57–94

    }

    size_t TWriteableNode::Pack(char* buffer) const {
        const size_t length = Measure();

        char flags = 0;
        if (LeafPos) {
            flags |= MT_FINAL;
        }
        if (ForwardOffset != NPOS) {
            flags |= MT_NEXT;
        }

        const size_t leftOffset = LeftOffset != NPOS ? LeftOffset + length : 0;
        const size_t rightOffset = RightOffset != NPOS ? RightOffset + length : 0;
        const size_t leftOffsetSize = MeasureOffset(leftOffset);
        const size_t rightOffsetSize = MeasureOffset(rightOffset);
        flags |= (leftOffsetSize << MT_LEFTSHIFT);
        flags |= (rightOffsetSize << MT_RIGHTSHIFT);

        buffer[0] = flags;
        buffer[1] = Label;
        size_t usedLen = 2;
        usedLen += PackOffset(buffer + usedLen, leftOffset);
        usedLen += PackOffset(buffer + usedLen, rightOffset);

        if (LeafPos && LeafLength) {
            memcpy(buffer + usedLen, LeafPos, LeafLength);
            usedLen += LeafLength;
        }

        if (ForwardOffset != NPOS && ForwardOffset != 0) {
            const size_t fwdOffset = ForwardOffset + length - usedLen;
            size_t fwdOffsetSize = MeasureOffset(fwdOffset);
            buffer[usedLen++] = (char)(fwdOffsetSize & MT_SIZEMASK);
            usedLen += PackOffset(buffer + usedLen, fwdOffset);
        }
        Y_ASSERT(usedLen == length);
        return usedLen;
    }

}