1 /* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 2010, Oracle America, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are
10 * met:
11 *
12 * * Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials
17 * provided with the distribution.
18 * * Neither the name of the "Oracle America, Inc." nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #if defined(LIBC_SCCS) && !defined(lint)
37 static char *sccsid2 = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
38 static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";
39 #endif
40 /*
41 * xdr_float.c, Generic XDR routines implementation.
42 *
43 * These are the "floating point" xdr routines used to (de)serialize
44 * most common data items. See xdr.h for more info on the interface to
45 * xdr.
46 */
47
48 #include "namespace.h"
49 #include <sys/param.h>
50
51 #include <stdio.h>
52
53 #include <rpc/types.h>
54 #include <rpc/xdr.h>
55 #include "un-namespace.h"
56
57 /*
58 * NB: Not portable.
59 * This routine works on machines with IEEE754 FP and Vaxen.
60 */
61
62 #include <machine/endian.h>
63 #define IEEEFP
64
65 #if defined(__vax__)
66
67 /* What IEEE single precision floating point looks like on a Vax */
68 struct ieee_single {
69 unsigned int mantissa: 23;
70 unsigned int exp : 8;
71 unsigned int sign : 1;
72 };
73
74 /* Vax single precision floating point */
75 struct vax_single {
76 unsigned int mantissa1 : 7;
77 unsigned int exp : 8;
78 unsigned int sign : 1;
79 unsigned int mantissa2 : 16;
80 };
81
82 #define VAX_SNG_BIAS 0x81
83 #define IEEE_SNG_BIAS 0x7f
84
85 static struct sgl_limits {
86 struct vax_single s;
87 struct ieee_single ieee;
88 } sgl_limits[2] = {
89 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
90 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
91 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
92 { 0x0, 0x0, 0x0 }} /* Min IEEE */
93 };
94 #endif /* vax */
95
96 bool_t
xdr_float(XDR * xdrs,float * fp)97 xdr_float(XDR *xdrs, float *fp)
98 {
99 #ifndef IEEEFP
100 struct ieee_single is;
101 struct vax_single vs, *vsp;
102 struct sgl_limits *lim;
103 u_int i;
104 #endif
105 switch (xdrs->x_op) {
106
107 case XDR_ENCODE:
108 #ifdef IEEEFP
109 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
110 #else
111 vs = *((struct vax_single *)fp);
112 for (i = 0, lim = sgl_limits; i < nitems(sgl_limits);
113 i++, lim++) {
114 if ((vs.mantissa2 == lim->s.mantissa2) &&
115 (vs.exp == lim->s.exp) &&
116 (vs.mantissa1 == lim->s.mantissa1)) {
117 is = lim->ieee;
118 goto shipit;
119 }
120 }
121 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
122 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
123 shipit:
124 is.sign = vs.sign;
125 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
126 #endif
127
128 case XDR_DECODE:
129 #ifdef IEEEFP
130 return (XDR_GETINT32(xdrs, (int32_t *)fp));
131 #else
132 vsp = (struct vax_single *)fp;
133 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
134 return (FALSE);
135 for (i = 0, lim = sgl_limits; i < nitems(sgl_limits);
136 i++, lim++) {
137 if ((is.exp == lim->ieee.exp) &&
138 (is.mantissa == lim->ieee.mantissa)) {
139 *vsp = lim->s;
140 goto doneit;
141 }
142 }
143 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
144 vsp->mantissa2 = is.mantissa;
145 vsp->mantissa1 = (is.mantissa >> 16);
146 doneit:
147 vsp->sign = is.sign;
148 return (TRUE);
149 #endif
150
151 case XDR_FREE:
152 return (TRUE);
153 }
154 /* NOTREACHED */
155 return (FALSE);
156 }
157
158 #if defined(__vax__)
159 /* What IEEE double precision floating point looks like on a Vax */
160 struct ieee_double {
161 unsigned int mantissa1 : 20;
162 unsigned int exp : 11;
163 unsigned int sign : 1;
164 unsigned int mantissa2 : 32;
165 };
166
167 /* Vax double precision floating point */
168 struct vax_double {
169 unsigned int mantissa1 : 7;
170 unsigned int exp : 8;
171 unsigned int sign : 1;
172 unsigned int mantissa2 : 16;
173 unsigned int mantissa3 : 16;
174 unsigned int mantissa4 : 16;
175 };
176
177 #define VAX_DBL_BIAS 0x81
178 #define IEEE_DBL_BIAS 0x3ff
179 #define MASK(nbits) ((1 << nbits) - 1)
180
181 static struct dbl_limits {
182 struct vax_double d;
183 struct ieee_double ieee;
184 } dbl_limits[2] = {
185 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
186 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
187 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
188 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
189 };
190
191 #endif /* vax */
192
193
194 bool_t
xdr_double(XDR * xdrs,double * dp)195 xdr_double(XDR *xdrs, double *dp)
196 {
197 #ifdef IEEEFP
198 int32_t *i32p;
199 bool_t rv;
200 #else
201 int32_t *lp;
202 struct ieee_double id;
203 struct vax_double vd;
204 struct dbl_limits *lim;
205 u_int i;
206 #endif
207
208 switch (xdrs->x_op) {
209
210 case XDR_ENCODE:
211 #ifdef IEEEFP
212 i32p = (int32_t *)(void *)dp;
213 #if BYTE_ORDER == BIG_ENDIAN
214 rv = XDR_PUTINT32(xdrs, i32p);
215 if (!rv)
216 return (rv);
217 rv = XDR_PUTINT32(xdrs, i32p+1);
218 #else
219 rv = XDR_PUTINT32(xdrs, i32p+1);
220 if (!rv)
221 return (rv);
222 rv = XDR_PUTINT32(xdrs, i32p);
223 #endif
224 return (rv);
225 #else
226 vd = *((struct vax_double *)dp);
227 for (i = 0, lim = dbl_limits; i < nitems(dbl_limits);
228 i++, lim++) {
229 if ((vd.mantissa4 == lim->d.mantissa4) &&
230 (vd.mantissa3 == lim->d.mantissa3) &&
231 (vd.mantissa2 == lim->d.mantissa2) &&
232 (vd.mantissa1 == lim->d.mantissa1) &&
233 (vd.exp == lim->d.exp)) {
234 id = lim->ieee;
235 goto shipit;
236 }
237 }
238 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
239 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
240 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
241 (vd.mantissa3 << 13) |
242 ((vd.mantissa4 >> 3) & MASK(13));
243 shipit:
244 id.sign = vd.sign;
245 lp = (int32_t *)&id;
246 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
247 #endif
248
249 case XDR_DECODE:
250 #ifdef IEEEFP
251 i32p = (int32_t *)(void *)dp;
252 #if BYTE_ORDER == BIG_ENDIAN
253 rv = XDR_GETINT32(xdrs, i32p);
254 if (!rv)
255 return (rv);
256 rv = XDR_GETINT32(xdrs, i32p+1);
257 #else
258 rv = XDR_GETINT32(xdrs, i32p+1);
259 if (!rv)
260 return (rv);
261 rv = XDR_GETINT32(xdrs, i32p);
262 #endif
263 return (rv);
264 #else
265 lp = (int32_t *)&id;
266 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
267 return (FALSE);
268 for (i = 0, lim = dbl_limits; i < nitems(dbl_limits);
269 i++, lim++) {
270 if ((id.mantissa2 == lim->ieee.mantissa2) &&
271 (id.mantissa1 == lim->ieee.mantissa1) &&
272 (id.exp == lim->ieee.exp)) {
273 vd = lim->d;
274 goto doneit;
275 }
276 }
277 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
278 vd.mantissa1 = (id.mantissa1 >> 13);
279 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
280 (id.mantissa2 >> 29);
281 vd.mantissa3 = (id.mantissa2 >> 13);
282 vd.mantissa4 = (id.mantissa2 << 3);
283 doneit:
284 vd.sign = id.sign;
285 *dp = *((double *)&vd);
286 return (TRUE);
287 #endif
288
289 case XDR_FREE:
290 return (TRUE);
291 }
292 /* NOTREACHED */
293 return (FALSE);
294 }
295