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 */
46 static bool_t
x_putlong(XDR * xdrs,const long * longp)47 x_putlong(XDR *xdrs, const long *longp)
48 {
49
50 xdrs->x_handy += BYTES_PER_XDR_UNIT;
51 return (TRUE);
52 }
53
54 /* ARGSUSED */
55 static bool_t
x_putbytes(XDR * xdrs,const char * bp,u_int len)56 x_putbytes(XDR *xdrs, const char *bp, u_int len)
57 {
58
59 xdrs->x_handy += len;
60 return (TRUE);
61 }
62
63 static u_int
x_getpostn(XDR * xdrs)64 x_getpostn(XDR *xdrs)
65 {
66
67 return (xdrs->x_handy);
68 }
69
70 /* ARGSUSED */
71 static bool_t
x_setpostn(XDR * xdrs,u_int pos)72 x_setpostn(XDR *xdrs, u_int pos)
73 {
74
75 /* This is not allowed */
76 return (FALSE);
77 }
78
79 static int32_t *
x_inline(XDR * xdrs,u_int len)80 x_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 xdrs->x_private = malloc(len, M_RPC, M_WAITOK);
98 xdrs->x_base = (caddr_t)(uintptr_t) len;
99 xdrs->x_handy += len;
100 return ((int32_t *) xdrs->x_private);
101 }
102 }
103
104 static int
harmless(void)105 harmless(void)
106 {
107
108 /* Always return FALSE/NULL, as the case may be */
109 return (0);
110 }
111
112 static void
x_destroy(XDR * xdrs)113 x_destroy(XDR *xdrs)
114 {
115
116 xdrs->x_handy = 0;
117 xdrs->x_base = 0;
118 if (xdrs->x_private) {
119 free(xdrs->x_private, M_RPC);
120 xdrs->x_private = NULL;
121 }
122 return;
123 }
124
125 unsigned long
xdr_sizeof(xdrproc_t func,void * data)126 xdr_sizeof(xdrproc_t func, void *data)
127 {
128 XDR x;
129 struct xdr_ops ops;
130 bool_t stat;
131 /* to stop ANSI-C compiler from complaining */
132 typedef bool_t (* dummyfunc1)(XDR *, long *);
133 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int);
134
135 ops.x_putlong = x_putlong;
136 ops.x_putbytes = x_putbytes;
137 ops.x_inline = x_inline;
138 ops.x_getpostn = x_getpostn;
139 ops.x_setpostn = x_setpostn;
140 ops.x_destroy = x_destroy;
141
142 /* the other harmless ones */
143 ops.x_getlong = (dummyfunc1) harmless;
144 ops.x_getbytes = (dummyfunc2) harmless;
145
146 x.x_op = XDR_ENCODE;
147 x.x_ops = &ops;
148 x.x_handy = 0;
149 x.x_private = (caddr_t) NULL;
150 x.x_base = (caddr_t) 0;
151
152 stat = func(&x, data);
153 if (x.x_private)
154 free(x.x_private, M_RPC);
155 return (stat == TRUE ? (unsigned) x.x_handy: 0);
156 }
157