csvorbis.InfoMapping0.free C# (CSharp) Method

        internal void free()
        {
            chmuxlist=null;
            timesubmap=null;
            floorsubmap=null;
            residuesubmap=null;
            psysubmap=null;

            coupling_mag=null;
            coupling_ang=null;
        }

        override public Object unpack(Info vi, csBuffer opb)
        {
            // also responsible for range checking
            InfoMapping0 info = new InfoMapping0();

            // !!!!
            if (opb.read(1) != 0)
            {
                info.submaps = opb.read(4) + 1;
            }
            else
            {
                info.submaps = 1;
            }

            if (opb.read(1) != 0)
            {
                info.coupling_steps = opb.read(8) + 1;

                for (int i = 0; i < info.coupling_steps; i++)
                {
                    int testM = opb.read(ilog(vi.channels));
                    int testA = opb.read(ilog(vi.channels));

                    info.coupling_mag[i] = testM;
                    info.coupling_ang[i] = testA;

                    if (testM < 0 ||
                        testA < 0 ||
                        testM >= vi.channels ||
                        testA >= vi.channels)
                    {
                        //goto err_out;
                        info.free();
                        return(null);
                    }
                }
            }

            if (opb.read(2) > 0)
            { /* 2,3:reserved */
                //goto err_out;
                info.free();
                return(null);
            }

            if (info.submaps > 1)
            {
                for (int i = 0; i < vi.channels; i++)
                {
                    info.chmuxlist[i] = opb.read(4);
                    if (info.chmuxlist[i] >= info.submaps)
                    {
                        //goto err_out;
                        info.free();
                        return(null);
                    }
                }
            }

            for (int i = 0; i < info.submaps; i++)
            {
                info.timesubmap[i] = opb.read(8);
                if (info.timesubmap[i] >= vi.times)
                {
                    //goto err_out;
                    info.free();
                    return(null);
                }
                info.floorsubmap[i] = opb.read(8);
                if (info.floorsubmap[i] >= vi.floors)
                {
                    //goto err_out;
                    info.free();
                    return(null);
                }
                info.residuesubmap[i] = opb.read(8);
                if (info.residuesubmap[i] >= vi.residues)
                {
                    //goto err_out;
                    info.free();
                    return(null);
                }
            }
            return(info);
            //err_out:
            //free_info(info);
            //return(NULL);
        }