1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29/*
30 * xdr_sizeof.c
31 *
32 * Copyright 1990 Sun Microsystems, Inc.
33 *
34 * General purpose routine to see how much space something will use
35 * when serialized using XDR.
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/malloc.h>
44
45#include <rpc/types.h>
46#include <rpc/xdr.h>
47
48/* ARGSUSED */
49static bool_t
50x_putlong(XDR *xdrs, const long *longp)
51{
52
53	xdrs->x_handy += BYTES_PER_XDR_UNIT;
54	return (TRUE);
55}
56
57/* ARGSUSED */
58static bool_t
59x_putbytes(XDR *xdrs, const char *bp, u_int len)
60{
61
62	xdrs->x_handy += len;
63	return (TRUE);
64}
65
66static u_int
67x_getpostn(XDR *xdrs)
68{
69
70	return (xdrs->x_handy);
71}
72
73/* ARGSUSED */
74static bool_t
75x_setpostn(XDR *xdrs, u_int pos)
76{
77
78	/* This is not allowed */
79	return (FALSE);
80}
81
82static int32_t *
83x_inline(XDR *xdrs, u_int len)
84{
85
86	if (len == 0) {
87		return (NULL);
88	}
89	if (xdrs->x_op != XDR_ENCODE) {
90		return (NULL);
91	}
92	if (len < (u_int)(uintptr_t)xdrs->x_base) {
93		/* x_private was already allocated */
94		xdrs->x_handy += len;
95		return ((int32_t *) xdrs->x_private);
96	} else {
97		/* Free the earlier space and allocate new area */
98		if (xdrs->x_private)
99			free(xdrs->x_private, M_RPC);
100		if ((xdrs->x_private = (caddr_t) malloc(len, M_RPC, M_WAITOK)) == NULL) {
101			xdrs->x_base = 0;
102			return (NULL);
103		}
104		xdrs->x_base = (caddr_t)(uintptr_t) len;
105		xdrs->x_handy += len;
106		return ((int32_t *) xdrs->x_private);
107	}
108}
109
110static int
111harmless(void)
112{
113
114	/* Always return FALSE/NULL, as the case may be */
115	return (0);
116}
117
118static void
119x_destroy(XDR *xdrs)
120{
121
122	xdrs->x_handy = 0;
123	xdrs->x_base = 0;
124	if (xdrs->x_private) {
125		free(xdrs->x_private, M_RPC);
126		xdrs->x_private = NULL;
127	}
128	return;
129}
130
131unsigned long
132xdr_sizeof(xdrproc_t func, void *data)
133{
134	XDR x;
135	struct xdr_ops ops;
136	bool_t stat;
137	/* to stop ANSI-C compiler from complaining */
138	typedef  bool_t (* dummyfunc1)(XDR *, long *);
139	typedef  bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
140
141	ops.x_putlong = x_putlong;
142	ops.x_putbytes = x_putbytes;
143	ops.x_inline = x_inline;
144	ops.x_getpostn = x_getpostn;
145	ops.x_setpostn = x_setpostn;
146	ops.x_destroy = x_destroy;
147
148	/* the other harmless ones */
149	ops.x_getlong =  (dummyfunc1) harmless;
150	ops.x_getbytes = (dummyfunc2) harmless;
151
152	x.x_op = XDR_ENCODE;
153	x.x_ops = &ops;
154	x.x_handy = 0;
155	x.x_private = (caddr_t) NULL;
156	x.x_base = (caddr_t) 0;
157
158	stat = func(&x, data);
159	if (x.x_private)
160		free(x.x_private, M_RPC);
161	return (stat == TRUE ? (unsigned) x.x_handy: 0);
162}
163