1 /* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ */
2
3 /*-
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char *sccsid2 = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
36 static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";
37 #endif
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 /*
42 * xdr_float.c, Generic XDR routines implementation.
43 *
44 * These are the "floating point" xdr routines used to (de)serialize
45 * most common data items. See xdr.h for more info on the interface to
46 * xdr.
47 */
48
49 #include "namespace.h"
50 #include <sys/types.h>
51 #include <sys/param.h>
52
53 #include <stdio.h>
54
55 #include <rpc/types.h>
56 #include <rpc/xdr.h>
57 #include "un-namespace.h"
58
59 /*
60 * NB: Not portable.
61 * This routine works on machines with IEEE754 FP and Vaxen.
62 */
63
64 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
65 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
66 defined(__arm__) || defined(__ppc__) || \
67 defined(__arm26__) || defined(__sparc64__) || defined(__amd64__) || \
68 defined(__aarch64__)
69 #include <machine/endian.h>
70 #define IEEEFP
71 #endif
72
73 #if defined(__vax__)
74
75 /* What IEEE single precision floating point looks like on a Vax */
76 struct ieee_single {
77 unsigned int mantissa: 23;
78 unsigned int exp : 8;
79 unsigned int sign : 1;
80 };
81
82 /* Vax single precision floating point */
83 struct vax_single {
84 unsigned int mantissa1 : 7;
85 unsigned int exp : 8;
86 unsigned int sign : 1;
87 unsigned int mantissa2 : 16;
88 };
89
90 #define VAX_SNG_BIAS 0x81
91 #define IEEE_SNG_BIAS 0x7f
92
93 static struct sgl_limits {
94 struct vax_single s;
95 struct ieee_single ieee;
96 } sgl_limits[2] = {
97 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
98 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
99 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
100 { 0x0, 0x0, 0x0 }} /* Min IEEE */
101 };
102 #endif /* vax */
103
104 bool_t
xdr_float(XDR * xdrs,float * fp)105 xdr_float(XDR *xdrs, float *fp)
106 {
107 #ifndef IEEEFP
108 struct ieee_single is;
109 struct vax_single vs, *vsp;
110 struct sgl_limits *lim;
111 int i;
112 #endif
113 switch (xdrs->x_op) {
114
115 case XDR_ENCODE:
116 #ifdef IEEEFP
117 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
118 #else
119 vs = *((struct vax_single *)fp);
120 for (i = 0, lim = sgl_limits;
121 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
122 i++, lim++) {
123 if ((vs.mantissa2 == lim->s.mantissa2) &&
124 (vs.exp == lim->s.exp) &&
125 (vs.mantissa1 == lim->s.mantissa1)) {
126 is = lim->ieee;
127 goto shipit;
128 }
129 }
130 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
131 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
132 shipit:
133 is.sign = vs.sign;
134 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
135 #endif
136
137 case XDR_DECODE:
138 #ifdef IEEEFP
139 return (XDR_GETINT32(xdrs, (int32_t *)fp));
140 #else
141 vsp = (struct vax_single *)fp;
142 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
143 return (FALSE);
144 for (i = 0, lim = sgl_limits;
145 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
146 i++, lim++) {
147 if ((is.exp == lim->ieee.exp) &&
148 (is.mantissa == lim->ieee.mantissa)) {
149 *vsp = lim->s;
150 goto doneit;
151 }
152 }
153 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
154 vsp->mantissa2 = is.mantissa;
155 vsp->mantissa1 = (is.mantissa >> 16);
156 doneit:
157 vsp->sign = is.sign;
158 return (TRUE);
159 #endif
160
161 case XDR_FREE:
162 return (TRUE);
163 }
164 /* NOTREACHED */
165 return (FALSE);
166 }
167
168 #if defined(__vax__)
169 /* What IEEE double precision floating point looks like on a Vax */
170 struct ieee_double {
171 unsigned int mantissa1 : 20;
172 unsigned int exp : 11;
173 unsigned int sign : 1;
174 unsigned int mantissa2 : 32;
175 };
176
177 /* Vax double precision floating point */
178 struct vax_double {
179 unsigned int mantissa1 : 7;
180 unsigned int exp : 8;
181 unsigned int sign : 1;
182 unsigned int mantissa2 : 16;
183 unsigned int mantissa3 : 16;
184 unsigned int mantissa4 : 16;
185 };
186
187 #define VAX_DBL_BIAS 0x81
188 #define IEEE_DBL_BIAS 0x3ff
189 #define MASK(nbits) ((1 << nbits) - 1)
190
191 static struct dbl_limits {
192 struct vax_double d;
193 struct ieee_double ieee;
194 } dbl_limits[2] = {
195 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
196 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
197 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
198 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
199 };
200
201 #endif /* vax */
202
203
204 bool_t
xdr_double(XDR * xdrs,double * dp)205 xdr_double(XDR *xdrs, double *dp)
206 {
207 #ifdef IEEEFP
208 int32_t *i32p;
209 bool_t rv;
210 #else
211 int32_t *lp;
212 struct ieee_double id;
213 struct vax_double vd;
214 struct dbl_limits *lim;
215 int i;
216 #endif
217
218 switch (xdrs->x_op) {
219
220 case XDR_ENCODE:
221 #ifdef IEEEFP
222 i32p = (int32_t *)(void *)dp;
223 #if BYTE_ORDER == BIG_ENDIAN
224 rv = XDR_PUTINT32(xdrs, i32p);
225 if (!rv)
226 return (rv);
227 rv = XDR_PUTINT32(xdrs, i32p+1);
228 #else
229 rv = XDR_PUTINT32(xdrs, i32p+1);
230 if (!rv)
231 return (rv);
232 rv = XDR_PUTINT32(xdrs, i32p);
233 #endif
234 return (rv);
235 #else
236 vd = *((struct vax_double *)dp);
237 for (i = 0, lim = dbl_limits;
238 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
239 i++, lim++) {
240 if ((vd.mantissa4 == lim->d.mantissa4) &&
241 (vd.mantissa3 == lim->d.mantissa3) &&
242 (vd.mantissa2 == lim->d.mantissa2) &&
243 (vd.mantissa1 == lim->d.mantissa1) &&
244 (vd.exp == lim->d.exp)) {
245 id = lim->ieee;
246 goto shipit;
247 }
248 }
249 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
250 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
251 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
252 (vd.mantissa3 << 13) |
253 ((vd.mantissa4 >> 3) & MASK(13));
254 shipit:
255 id.sign = vd.sign;
256 lp = (int32_t *)&id;
257 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
258 #endif
259
260 case XDR_DECODE:
261 #ifdef IEEEFP
262 i32p = (int32_t *)(void *)dp;
263 #if BYTE_ORDER == BIG_ENDIAN
264 rv = XDR_GETINT32(xdrs, i32p);
265 if (!rv)
266 return (rv);
267 rv = XDR_GETINT32(xdrs, i32p+1);
268 #else
269 rv = XDR_GETINT32(xdrs, i32p+1);
270 if (!rv)
271 return (rv);
272 rv = XDR_GETINT32(xdrs, i32p);
273 #endif
274 return (rv);
275 #else
276 lp = (int32_t *)&id;
277 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
278 return (FALSE);
279 for (i = 0, lim = dbl_limits;
280 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
281 i++, lim++) {
282 if ((id.mantissa2 == lim->ieee.mantissa2) &&
283 (id.mantissa1 == lim->ieee.mantissa1) &&
284 (id.exp == lim->ieee.exp)) {
285 vd = lim->d;
286 goto doneit;
287 }
288 }
289 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
290 vd.mantissa1 = (id.mantissa1 >> 13);
291 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
292 (id.mantissa2 >> 29);
293 vd.mantissa3 = (id.mantissa2 >> 13);
294 vd.mantissa4 = (id.mantissa2 << 3);
295 doneit:
296 vd.sign = id.sign;
297 *dp = *((double *)&vd);
298 return (TRUE);
299 #endif
300
301 case XDR_FREE:
302 return (TRUE);
303 }
304 /* NOTREACHED */
305 return (FALSE);
306 }
307