/*
文件名:Pack_Class.nut
路径:Base/_Tool/Pack_Class.nut
创建日期:2025-06-30	09:24
文件用途:字节包
*/
class Packet {

    //读取指针位置
    Index = 0;

    //内存数据
    Pointer = null;
    //包大小
    Size = 0;


    //加载包
    function Load(P, S) {
        Pointer = P;
        Size = S;
    }

    //读取指针跳转
    function Seek(...) {
        local Pos = vargv[0];
        local Mode = 0;
        if(vargc > 1) Mode = vargv[1];
        if (Mode == 0) {
            Index = Pos;
        } else if (Mode == 1) {
            Index += Pos;
        } else if (Mode == 2) {
            Index -= Pos;
        }
    }

    //读取整形
    function GetInt() {
        local Size_t = 4;
        if (Index + Size_t > Size) {
            print("读取包越界！");
            return;
        }
        local Buf = NativePointer(Pointer).add(Index).readInt();
        Index += Size_t;
        return Buf;
    }

    //读取流
    function GetStream(Size_t) {
        if (Index + Size_t > Size) {
            print("读取包越界！");
            return;
        }
        local Np = NativePointer(Pointer).add(Index);
        Np.Size = Size_t;
        Index += Size_t;
        return Np;
    }
}