1 /* $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $ */
2
3 /*
4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 * unrestricted use provided that this legend is included on all tape
6 * media and as a part of the software program in whole or part. Users
7 * may copy or modify Sun RPC without charge, but are not authorized
8 * to license or distribute it to anyone else except as part of a product or
9 * program developed by the user.
10 *
11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 *
15 * Sun RPC is provided with no support and without any obligation on the
16 * part of Sun Microsystems, Inc. to assist in its use, correction,
17 * modification or enhancement.
18 *
19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 * OR ANY PART THEREOF.
22 *
23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 * or profits or other special, indirect and consequential damages, even if
25 * Sun has been advised of the possibility of such damages.
26 *
27 * Sun Microsystems, Inc.
28 * 2550 Garcia Avenue
29 * Mountain View, California 94043
30 */
31
32 #include <sys/cdefs.h>
33 /*
34 * xdr_mem.h, XDR implementation using memory buffers.
35 *
36 * Copyright (C) 1984, Sun Microsystems, Inc.
37 *
38 * If you have some data to be interpreted as external data representation
39 * or to be converted to external data representation in a memory buffer,
40 * then this is the package for you.
41 *
42 */
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/malloc.h>
47 #include <sys/mbuf.h>
48
49 #include <rpc/types.h>
50 #include <rpc/xdr.h>
51
52 static void xdrmem_destroy(XDR *);
53 static bool_t xdrmem_getlong_aligned(XDR *, long *);
54 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
55 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
56 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
57 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
58 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
59 static bool_t xdrmem_putmbuf(XDR *, struct mbuf *);
60 /* XXX: w/64-bit pointers, u_int not enough! */
61 static u_int xdrmem_getpos(XDR *);
62 static bool_t xdrmem_setpos(XDR *, u_int);
63 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
64 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
65 static bool_t xdrmem_control(XDR *xdrs, int request, void *info);
66
67 static const struct xdr_ops xdrmem_ops_aligned = {
68 .x_getlong = xdrmem_getlong_aligned,
69 .x_putlong = xdrmem_putlong_aligned,
70 .x_getbytes = xdrmem_getbytes,
71 .x_putbytes = xdrmem_putbytes,
72 .x_putmbuf = xdrmem_putmbuf,
73 .x_getpostn = xdrmem_getpos,
74 .x_setpostn = xdrmem_setpos,
75 .x_inline = xdrmem_inline_aligned,
76 .x_destroy = xdrmem_destroy,
77 .x_control = xdrmem_control,
78 };
79
80 static const struct xdr_ops xdrmem_ops_unaligned = {
81 .x_getlong = xdrmem_getlong_unaligned,
82 .x_putlong = xdrmem_putlong_unaligned,
83 .x_getbytes = xdrmem_getbytes,
84 .x_putbytes = xdrmem_putbytes,
85 .x_putmbuf = xdrmem_putmbuf,
86 .x_getpostn = xdrmem_getpos,
87 .x_setpostn = xdrmem_setpos,
88 .x_inline = xdrmem_inline_unaligned,
89 .x_destroy = xdrmem_destroy,
90 .x_control = xdrmem_control
91 };
92
93 /*
94 * The procedure xdrmem_create initializes a stream descriptor for a
95 * memory buffer.
96 */
97 void
xdrmem_create(XDR * xdrs,char * addr,u_int size,enum xdr_op op)98 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
99 {
100
101 xdrs->x_op = op;
102 xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
103 ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
104 xdrs->x_private = xdrs->x_base = addr;
105 xdrs->x_handy = size;
106 }
107
108 /*ARGSUSED*/
109 static void
xdrmem_destroy(XDR * xdrs)110 xdrmem_destroy(XDR *xdrs)
111 {
112
113 }
114
115 static bool_t
xdrmem_getlong_aligned(XDR * xdrs,long * lp)116 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
117 {
118
119 if (xdrs->x_handy < sizeof(int32_t))
120 return (FALSE);
121 xdrs->x_handy -= sizeof(int32_t);
122 *lp = ntohl(*(uint32_t *)xdrs->x_private);
123 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
124 return (TRUE);
125 }
126
127 static bool_t
xdrmem_putlong_aligned(XDR * xdrs,const long * lp)128 xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
129 {
130
131 if (xdrs->x_handy < sizeof(int32_t))
132 return (FALSE);
133 xdrs->x_handy -= sizeof(int32_t);
134 *(uint32_t *)xdrs->x_private = htonl((uint32_t)*lp);
135 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
136 return (TRUE);
137 }
138
139 static bool_t
xdrmem_getlong_unaligned(XDR * xdrs,long * lp)140 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
141 {
142 uint32_t l;
143
144 if (xdrs->x_handy < sizeof(int32_t))
145 return (FALSE);
146 xdrs->x_handy -= sizeof(int32_t);
147 memmove(&l, xdrs->x_private, sizeof(int32_t));
148 *lp = ntohl(l);
149 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
150 return (TRUE);
151 }
152
153 static bool_t
xdrmem_putlong_unaligned(XDR * xdrs,const long * lp)154 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
155 {
156 uint32_t l;
157
158 if (xdrs->x_handy < sizeof(int32_t))
159 return (FALSE);
160 xdrs->x_handy -= sizeof(int32_t);
161 l = htonl((uint32_t)*lp);
162 memmove(xdrs->x_private, &l, sizeof(int32_t));
163 xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
164 return (TRUE);
165 }
166
167 static bool_t
xdrmem_getbytes(XDR * xdrs,char * addr,u_int len)168 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
169 {
170
171 if (xdrs->x_handy < len)
172 return (FALSE);
173 xdrs->x_handy -= len;
174 memmove(addr, xdrs->x_private, len);
175 xdrs->x_private = (char *)xdrs->x_private + len;
176 return (TRUE);
177 }
178
179 static bool_t
xdrmem_putbytes(XDR * xdrs,const char * addr,u_int len)180 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
181 {
182
183 if (xdrs->x_handy < len)
184 return (FALSE);
185 xdrs->x_handy -= len;
186 memmove(xdrs->x_private, addr, len);
187 xdrs->x_private = (char *)xdrs->x_private + len;
188 return (TRUE);
189 }
190
191 /*
192 * Append mbuf. May fail if not enough space. Caller owns the mbuf.
193 */
194 static bool_t
xdrmem_putmbuf(XDR * xdrs,struct mbuf * m)195 xdrmem_putmbuf(XDR *xdrs, struct mbuf *m)
196 {
197 u_int len;
198
199 if (__predict_false(m == NULL))
200 return (TRUE);
201
202 len = m_length(m, NULL);
203
204 if (__predict_false(xdrs->x_handy < len))
205 return (FALSE);
206 xdrs->x_handy -= len;
207 m_copydata(m, 0, len, xdrs->x_private);
208 xdrs->x_private = (char *)xdrs->x_private + len;
209 return (TRUE);
210 }
211
212 static u_int
xdrmem_getpos(XDR * xdrs)213 xdrmem_getpos(XDR *xdrs)
214 {
215
216 /* XXX w/64-bit pointers, u_int not enough! */
217 return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
218 }
219
220 static bool_t
xdrmem_setpos(XDR * xdrs,u_int pos)221 xdrmem_setpos(XDR *xdrs, u_int pos)
222 {
223 char *newaddr = xdrs->x_base + pos;
224 char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
225
226 if (newaddr > lastaddr)
227 return (FALSE);
228 xdrs->x_private = newaddr;
229 xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
230 return (TRUE);
231 }
232
233 static int32_t *
xdrmem_inline_aligned(XDR * xdrs,u_int len)234 xdrmem_inline_aligned(XDR *xdrs, u_int len)
235 {
236 int32_t *buf = NULL;
237
238 if (xdrs->x_handy >= len) {
239 xdrs->x_handy -= len;
240 buf = (int32_t *)xdrs->x_private;
241 xdrs->x_private = (char *)xdrs->x_private + len;
242 }
243 return (buf);
244 }
245
246 /* ARGSUSED */
247 static int32_t *
xdrmem_inline_unaligned(XDR * xdrs,u_int len)248 xdrmem_inline_unaligned(XDR *xdrs, u_int len)
249 {
250
251 return (0);
252 }
253
254 static bool_t
xdrmem_control(XDR * xdrs,int request,void * info)255 xdrmem_control(XDR *xdrs, int request, void *info)
256 {
257 xdr_bytesrec *xptr;
258 int32_t *l;
259 int len;
260
261 switch (request) {
262 case XDR_GET_BYTES_AVAIL:
263 xptr = (xdr_bytesrec *)info;
264 xptr->xc_is_last_record = TRUE;
265 xptr->xc_num_avail = xdrs->x_handy;
266 return (TRUE);
267
268 case XDR_PEEK:
269 /*
270 * Return the next 4 byte unit in the XDR stream.
271 */
272 if (xdrs->x_handy < sizeof (int32_t))
273 return (FALSE);
274 l = (int32_t *)info;
275 *l = (int32_t)ntohl((uint32_t)
276 (*((int32_t *)(xdrs->x_private))));
277 return (TRUE);
278
279 case XDR_SKIPBYTES:
280 /*
281 * Skip the next N bytes in the XDR stream.
282 */
283 l = (int32_t *)info;
284 len = RNDUP((int)(*l));
285 if (xdrs->x_handy < len)
286 return (FALSE);
287 xdrs->x_handy -= len;
288 xdrs->x_private = (char *)xdrs->x_private + len;
289 return (TRUE);
290 }
291 return (FALSE);
292 }
293