165 lines
4.3 KiB
C
165 lines
4.3 KiB
C
/* @(#)xdr_mem.c 2.1 88/07/29 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* xdr_mem.h, XDR implementation using memory buffers.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* If you have some data to be interpreted as external data representation
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* or to be converted to external data representation in a memory buffer,
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* then this is the package for you.
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*
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*/
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include <string.h>
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#include <limits.h>
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static bool_t xdrmem_getlong (XDR *, long *);
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static bool_t xdrmem_putlong (XDR *, const long *);
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static bool_t xdrmem_getbytes (XDR *, char *, unsigned int);
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static bool_t xdrmem_putbytes (XDR *, const char *, unsigned int);
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static unsigned int xdrmem_getpos (const XDR *);
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static bool_t xdrmem_setpos (XDR *, unsigned int);
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static int32_t *xdrmem_inline (XDR *, unsigned int);
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static void xdrmem_destroy (XDR *);
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static struct xdr_ops xdrmem_ops = {
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xdrmem_getlong,
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xdrmem_putlong,
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xdrmem_getbytes,
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xdrmem_putbytes,
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xdrmem_getpos,
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xdrmem_setpos,
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xdrmem_inline,
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xdrmem_destroy,
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NULL,
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NULL
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};
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/*
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* The procedure xdrmem_create initializes a stream descriptor for a
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* memory buffer.
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*/
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void
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xdrmem_create (XDR *xdrs, const char* addr, unsigned int size, enum xdr_op op)
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{
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xdrs->x_op = op;
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xdrs->x_ops = &xdrmem_ops;
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xdrs->x_private = xdrs->x_base = (char*)addr;
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xdrs->x_handy = size;
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}
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static void
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xdrmem_destroy (XDR *xdrs)
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{
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}
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static bool_t
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xdrmem_getlong (XDR *xdrs, long *lp)
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{
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if (xdrs->x_handy < 4) return FALSE;
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xdrs->x_handy -= 4;
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*lp = (int32_t) ntohl((*((int32_t *) (xdrs->x_private))));
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xdrs->x_private += 4;
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return TRUE;
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}
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static bool_t
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xdrmem_putlong (XDR *xdrs, const long *lp)
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{
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if (xdrs->x_handy < 4) return FALSE;
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xdrs->x_handy -= 4;
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*(int32_t *) xdrs->x_private = htonl(*lp);
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xdrs->x_private += 4;
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return (TRUE);
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}
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static bool_t
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xdrmem_getbytes (XDR *xdrs, char *addr, unsigned int len)
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{
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if (xdrs->x_handy < len) return FALSE;
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xdrs->x_handy -= len;
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memmove(addr, xdrs->x_private, len);
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xdrs->x_private += len;
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return TRUE;
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}
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static bool_t
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xdrmem_putbytes (XDR *xdrs, const char *addr, unsigned int len)
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{
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if (xdrs->x_handy < len) return FALSE;
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xdrs->x_handy -= len;
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memmove(xdrs->x_private, addr, len);
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xdrs->x_private += len;
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return (TRUE);
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}
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static unsigned int xdrmem_getpos (const XDR *xdrs)
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{
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return ((unsigned long) xdrs->x_private - (unsigned long) xdrs->x_base);
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}
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static bool_t xdrmem_setpos(XDR *xdrs, unsigned int pos)
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{
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register char* newaddr = xdrs->x_base + pos;
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register char* lastaddr = xdrs->x_private + xdrs->x_handy;
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if ((long) newaddr > (long) lastaddr
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|| (UINT_MAX < LONG_MAX
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&& (long) UINT_MAX < (long) lastaddr - (long) newaddr))
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return (FALSE);
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xdrs->x_private = newaddr;
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xdrs->x_handy = (long) lastaddr - (long) newaddr;
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return (TRUE);
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}
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static int32_t *
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xdrmem_inline (XDR *xdrs, unsigned int len)
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{
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int32_t *buf = 0;
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if (xdrs->x_handy >= len) {
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xdrs->x_handy -= len;
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buf = (int32_t *) xdrs->x_private;
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xdrs->x_private += len;
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}
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return (buf);
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}
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