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- /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */
- /*
- * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
- * unrestricted use provided that this legend is included on all tape
- * media and as a part of the software program in whole or part. Users
- * may copy or modify Sun RPC without charge, but are not authorized
- * to license or distribute it to anyone else except as part of a product or
- * program developed by the user.
- *
- * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
- * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
- *
- * Sun RPC is provided with no support and without any obligation on the
- * part of Sun Microsystems, Inc. to assist in its use, correction,
- * modification or enhancement.
- *
- * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
- * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
- * OR ANY PART THEREOF.
- *
- * In no event will Sun Microsystems, Inc. be liable for any lost revenue
- * or profits or other special, indirect and consequential damages, even if
- * Sun has been advised of the possibility of such damages.
- *
- * Sun Microsystems, Inc.
- * 2550 Garcia Avenue
- * Mountain View, California 94043
- */
- #include <sys/cdefs.h>
- /*
- * 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.
- *
- */
- #include <sys/param.h>
- #include <sys/systm.h>
- #include <sys/malloc.h>
- #include <rpc/types.h>
- #include <rpc/xdr.h>
- static void xdrmem_destroy(XDR *);
- static bool_t xdrmem_getlong_aligned(XDR *, long *);
- static bool_t xdrmem_putlong_aligned(XDR *, const long *);
- static bool_t xdrmem_getlong_unaligned(XDR *, long *);
- static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
- static bool_t xdrmem_getbytes(XDR *, char *, u_int);
- static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
- /* XXX: w/64-bit pointers, u_int not enough! */
- static u_int xdrmem_getpos(XDR *);
- static bool_t xdrmem_setpos(XDR *, u_int);
- static int32_t *xdrmem_inline_aligned(XDR *, u_int);
- static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
- static bool_t xdrmem_control(XDR *xdrs, int request, void *info);
- static const struct xdr_ops xdrmem_ops_aligned = {
- xdrmem_getlong_aligned,
- xdrmem_putlong_aligned,
- xdrmem_getbytes,
- xdrmem_putbytes,
- xdrmem_getpos,
- xdrmem_setpos,
- xdrmem_inline_aligned,
- xdrmem_destroy,
- xdrmem_control
- };
- static const struct xdr_ops xdrmem_ops_unaligned = {
- xdrmem_getlong_unaligned,
- xdrmem_putlong_unaligned,
- xdrmem_getbytes,
- xdrmem_putbytes,
- xdrmem_getpos,
- xdrmem_setpos,
- xdrmem_inline_unaligned,
- xdrmem_destroy,
- xdrmem_control
- };
- /*
- * The procedure xdrmem_create initializes a stream descriptor for a
- * memory buffer.
- */
- void
- xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
- {
- xdrs->x_op = op;
- xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
- ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
- xdrs->x_private = xdrs->x_base = addr;
- xdrs->x_handy = size;
- }
- /*ARGSUSED*/
- static void
- xdrmem_destroy(XDR *xdrs)
- {
- }
- static bool_t
- xdrmem_getlong_aligned(XDR *xdrs, long *lp)
- {
- if (xdrs->x_handy < sizeof(int32_t))
- return (FALSE);
- xdrs->x_handy -= sizeof(int32_t);
- *lp = ntohl(*(uint32_t *)xdrs->x_private);
- xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
- return (TRUE);
- }
- static bool_t
- xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
- {
- if (xdrs->x_handy < sizeof(int32_t))
- return (FALSE);
- xdrs->x_handy -= sizeof(int32_t);
- *(uint32_t *)xdrs->x_private = htonl((uint32_t)*lp);
- xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
- return (TRUE);
- }
- static bool_t
- xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
- {
- uint32_t l;
- if (xdrs->x_handy < sizeof(int32_t))
- return (FALSE);
- xdrs->x_handy -= sizeof(int32_t);
- memmove(&l, xdrs->x_private, sizeof(int32_t));
- *lp = ntohl(l);
- xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
- return (TRUE);
- }
- static bool_t
- xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
- {
- uint32_t l;
- if (xdrs->x_handy < sizeof(int32_t))
- return (FALSE);
- xdrs->x_handy -= sizeof(int32_t);
- l = htonl((uint32_t)*lp);
- memmove(xdrs->x_private, &l, sizeof(int32_t));
- xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
- return (TRUE);
- }
- static bool_t
- xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
- {
- if (xdrs->x_handy < len)
- return (FALSE);
- xdrs->x_handy -= len;
- memmove(addr, xdrs->x_private, len);
- xdrs->x_private = (char *)xdrs->x_private + len;
- return (TRUE);
- }
- static bool_t
- xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
- {
- if (xdrs->x_handy < len)
- return (FALSE);
- xdrs->x_handy -= len;
- memmove(xdrs->x_private, addr, len);
- xdrs->x_private = (char *)xdrs->x_private + len;
- return (TRUE);
- }
- static u_int
- xdrmem_getpos(XDR *xdrs)
- {
- /* XXX w/64-bit pointers, u_int not enough! */
- return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
- }
- static bool_t
- xdrmem_setpos(XDR *xdrs, u_int pos)
- {
- char *newaddr = xdrs->x_base + pos;
- char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
- if (newaddr > lastaddr)
- return (FALSE);
- xdrs->x_private = newaddr;
- xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
- return (TRUE);
- }
- static int32_t *
- xdrmem_inline_aligned(XDR *xdrs, u_int len)
- {
- int32_t *buf = NULL;
- if (xdrs->x_handy >= len) {
- xdrs->x_handy -= len;
- buf = (int32_t *)xdrs->x_private;
- xdrs->x_private = (char *)xdrs->x_private + len;
- }
- return (buf);
- }
- /* ARGSUSED */
- static int32_t *
- xdrmem_inline_unaligned(XDR *xdrs, u_int len)
- {
- return (0);
- }
- static bool_t
- xdrmem_control(XDR *xdrs, int request, void *info)
- {
- xdr_bytesrec *xptr;
- int32_t *l;
- int len;
- switch (request) {
- case XDR_GET_BYTES_AVAIL:
- xptr = (xdr_bytesrec *)info;
- xptr->xc_is_last_record = TRUE;
- xptr->xc_num_avail = xdrs->x_handy;
- return (TRUE);
- case XDR_PEEK:
- /*
- * Return the next 4 byte unit in the XDR stream.
- */
- if (xdrs->x_handy < sizeof (int32_t))
- return (FALSE);
- l = (int32_t *)info;
- *l = (int32_t)ntohl((uint32_t)
- (*((int32_t *)(xdrs->x_private))));
- return (TRUE);
- case XDR_SKIPBYTES:
- /*
- * Skip the next N bytes in the XDR stream.
- */
- l = (int32_t *)info;
- len = RNDUP((int)(*l));
- if (xdrs->x_handy < len)
- return (FALSE);
- xdrs->x_handy -= len;
- xdrs->x_private = (char *)xdrs->x_private + len;
- return (TRUE);
- }
- return (FALSE);
- }
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