csvorbis.InfoFloor1.free C# (CSharp) Method

        internal void free()
        {
            partitionclass=null;
            class_dim=null;
            class_subs=null;
            class_book=null;
            class_subbook=null;
            postlist=null;
        }

        override public Object unpack(Info vi, csBuffer opb)
        {
            int        count = 0, maxclass = -1, rangebits;
            InfoFloor1 info = new InfoFloor1();

            /* read partitions */
            info.partitions = opb.read(5);                      /* only 0 to 31 legal */
            for (int j = 0; j < info.partitions; j++)
            {
                info.partitionclass[j] = opb.read(4);               /* only 0 to 15 legal */
                if (maxclass < info.partitionclass[j])
                {
                    maxclass = info.partitionclass[j];
                }
            }

            /* read partition classes */
            for (int j = 0; j < maxclass + 1; j++)
            {
                info.class_dim[j]  = opb.read(3) + 1;            /* 1 to 8 */
                info.class_subs[j] = opb.read(2);                /* 0,1,2,3 bits */
                if (info.class_subs[j] < 0)
                {
                    //goto err_out;
                    info.free();
                    return(null);
                }
                if (info.class_subs[j] != 0)
                {
                    info.class_book[j] = opb.read(8);
                }
                if (info.class_book[j] < 0 || info.class_book[j] >= vi.books)
                {
                    //goto err_out;
                    info.free();
                    return(null);
                }
                for (int k = 0; k < (1 << info.class_subs[j]); k++)
                {
                    info.class_subbook[j][k] = opb.read(8) - 1;
                    if (info.class_subbook[j][k] < -1 || info.class_subbook[j][k] >= vi.books)
                    {
                        //goto err_out;
                        info.free();
                        return(null);
                    }
                }
            }

            /* read the post list */
            info.mult = opb.read(2) + 1;             /* only 1,2,3,4 legal now */
            rangebits = opb.read(4);

            for (int j = 0, k = 0; j < info.partitions; j++)
            {
                count += info.class_dim[info.partitionclass[j]];
                for (; k < count; k++)
                {
                    int t = info.postlist[k + 2] = opb.read(rangebits);
                    if (t < 0 || t >= (1 << rangebits))
                    {
                        //goto err_out;
                        info.free();
                        return(null);
                    }
                }
            }
            info.postlist[0] = 0;
            info.postlist[1] = 1 << rangebits;

            return(info);
            //  err_out:
            //    info.free();
            //    return(null);
        }