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/param.h>
39#include <sys/systm.h>
40#include <sys/malloc.h>
41
42#include <rpc/types.h>
43#include <rpc/xdr.h>
44
45/* ARGSUSED */
46static bool_t
47x_putlong(XDR *xdrs, const long *longp)
48{
49
50	xdrs->x_handy += BYTES_PER_XDR_UNIT;
51	return (TRUE);
52}
53
54/* ARGSUSED */
55static bool_t
56x_putbytes(XDR *xdrs, const char *bp, u_int len)
57{
58
59	xdrs->x_handy += len;
60	return (TRUE);
61}
62
63static u_int
64x_getpostn(XDR *xdrs)
65{
66
67	return (xdrs->x_handy);
68}
69
70/* ARGSUSED */
71static bool_t
72x_setpostn(XDR *xdrs, u_int pos)
73{
74
75	/* This is not allowed */
76	return (FALSE);
77}
78
79static int32_t *
80x_inline(XDR *xdrs, u_int len)
81{
82
83	if (len == 0) {
84		return (NULL);
85	}
86	if (xdrs->x_op != XDR_ENCODE) {
87		return (NULL);
88	}
89	if (len < (u_int)(uintptr_t)xdrs->x_base) {
90		/* x_private was already allocated */
91		xdrs->x_handy += len;
92		return ((int32_t *) xdrs->x_private);
93	} else {
94		/* Free the earlier space and allocate new area */
95		if (xdrs->x_private)
96			free(xdrs->x_private, M_RPC);
97		if ((xdrs->x_private = (caddr_t) malloc(len, M_RPC, M_WAITOK)) == NULL) {
98			xdrs->x_base = 0;
99			return (NULL);
100		}
101		xdrs->x_base = (caddr_t)(uintptr_t) len;
102		xdrs->x_handy += len;
103		return ((int32_t *) xdrs->x_private);
104	}
105}
106
107static int
108harmless(void)
109{
110
111	/* Always return FALSE/NULL, as the case may be */
112	return (0);
113}
114
115static void
116x_destroy(XDR *xdrs)
117{
118
119	xdrs->x_handy = 0;
120	xdrs->x_base = 0;
121	if (xdrs->x_private) {
122		free(xdrs->x_private, M_RPC);
123		xdrs->x_private = NULL;
124	}
125	return;
126}
127
128unsigned long
129xdr_sizeof(xdrproc_t func, void *data)
130{
131	XDR x;
132	struct xdr_ops ops;
133	bool_t stat;
134	/* to stop ANSI-C compiler from complaining */
135	typedef  bool_t (* dummyfunc1)(XDR *, long *);
136	typedef  bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
137
138	ops.x_putlong = x_putlong;
139	ops.x_putbytes = x_putbytes;
140	ops.x_inline = x_inline;
141	ops.x_getpostn = x_getpostn;
142	ops.x_setpostn = x_setpostn;
143	ops.x_destroy = x_destroy;
144
145	/* the other harmless ones */
146	ops.x_getlong =  (dummyfunc1) harmless;
147	ops.x_getbytes = (dummyfunc2) harmless;
148
149	x.x_op = XDR_ENCODE;
150	x.x_ops = &ops;
151	x.x_handy = 0;
152	x.x_private = (caddr_t) NULL;
153	x.x_base = (caddr_t) 0;
154
155	stat = func(&x, data);
156	if (x.x_private)
157		free(x.x_private, M_RPC);
158	return (stat == TRUE ? (unsigned) x.x_handy: 0);
159}
160