xdr_mem.rar_memory

#if !defined(lint) && defined(SCCSIDS) static char sccsid[] = "@(#)xdr_mem.c 1.1 92/07/30 Copyr 1984 Sun Micro"; #endif /* * xdr_mem.h, XDR implementation using memory buffers. * * Copyright (C) 1984, Sun Microsystems, Inc. * * If you have some data to be interpreted as external data representation * or to be converted to external data representation in a memory buffer, * then this is the package for you. * */ #ifdef KERNEL #include <sys/param.h> #endif #include <rpc/types.h> #include <rpc/xdr.h> #include <netinet/in.h> static struct xdr_ops *xdrmem_ops(); /* * The procedure xdrmem_create initializes a stream descriptor for a * memory buffer. */ void xdrmem_create(xdrs, addr, size, op) register XDR *xdrs; caddr_t addr; u_int size; enum xdr_op op; { xdrs->x_op = op; xdrs->x_ops = xdrmem_ops(); xdrs->x_private = xdrs->x_base = addr; xdrs->x_handy = size; } static void xdrmem_destroy(/*xdrs*/) /* XDR *xdrs; */ { } static bool_t xdrmem_getlong(xdrs, lp) register XDR *xdrs; long *lp; { if ((xdrs->x_handy -= sizeof (long)) < 0) return (FALSE); *lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private)))); xdrs->x_private += sizeof (long); return (TRUE); } static bool_t xdrmem_putlong(xdrs, lp) register XDR *xdrs; long *lp; { if ((xdrs->x_handy -= sizeof (long)) < 0) return (FALSE); *(long *)xdrs->x_private = (long)htonl((u_long)(*lp)); xdrs->x_private += sizeof (long); return (TRUE); } static bool_t xdrmem_getbytes(xdrs, addr, len) register XDR *xdrs; caddr_t addr; register u_int len; { if ((xdrs->x_handy -= len) < 0) return (FALSE); bcopy(xdrs->x_private, addr, len); xdrs->x_private += len; return (TRUE); } static bool_t xdrmem_putbytes(xdrs, addr, len) register XDR *xdrs; caddr_t addr; register u_int len; { if ((xdrs->x_handy -= len) < 0) return (FALSE); bcopy(addr, xdrs->x_private, len); xdrs->x_private += len; return (TRUE); } static u_int xdrmem_getpos(xdrs) register XDR *xdrs; { return ((u_int)xdrs->x_private - (u_int)xdrs->x_base); } static bool_t xdrmem_setpos(xdrs, pos) register XDR *xdrs; u_int pos; { register caddr_t newaddr = xdrs->x_base + pos; register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; if ((long)newaddr > (long)lastaddr) return (FALSE); xdrs->x_private = newaddr; xdrs->x_handy = (int)lastaddr - (int)newaddr; return (TRUE); } static long * xdrmem_inline(xdrs, len) register XDR *xdrs; int len; { long *buf = 0; if (xdrs->x_handy >= len) { xdrs->x_handy -= len; buf = (long *) xdrs->x_private; xdrs->x_private += len; } return (buf); } static struct xdr_ops * xdrmem_ops() { static struct xdr_ops ops; if (ops.x_getlong == NULL) { ops.x_getlong = xdrmem_getlong; ops.x_putlong = xdrmem_putlong; ops.x_getbytes = xdrmem_getbytes; ops.x_putbytes = xdrmem_putbytes; ops.x_getpostn = xdrmem_getpos; ops.x_setpostn = xdrmem_setpos; ops.x_inline = xdrmem_inline; ops.x_destroy = xdrmem_destroy; } return (&ops); }