1 /* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt 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 #if defined(LIBC_SCCS) && !defined(lint)
33 static char *sccsid2 = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
34 static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";
35 #endif
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: stable/9/lib/libc/xdr/xdr_float.c 136582 2004-10-16 06:32:43Z obrien $");
38
39 /*
40 * xdr_float.c, Generic XDR routines implementation.
41 *
42 * Copyright (C) 1984, Sun Microsystems, Inc.
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__) || defined(__ia64__) || \
67 defined(__arm26__) || defined(__sparc64__) || defined(__amd64__)
68 #include <machine/endian.h>
69 #define IEEEFP
70 #endif
71
72 #if defined(__vax__)
73
74 /* What IEEE single precision floating point looks like on a Vax */
75 struct ieee_single {
76 unsigned int mantissa: 23;
77 unsigned int exp : 8;
78 unsigned int sign : 1;
79 };
80
81 /* Vax single precision floating point */
82 struct vax_single {
83 unsigned int mantissa1 : 7;
84 unsigned int exp : 8;
85 unsigned int sign : 1;
86 unsigned int mantissa2 : 16;
87 };
88
89 #define VAX_SNG_BIAS 0x81
90 #define IEEE_SNG_BIAS 0x7f
91
92 static struct sgl_limits {
93 struct vax_single s;
94 struct ieee_single ieee;
95 } sgl_limits[2] = {
96 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
97 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
98 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
99 { 0x0, 0x0, 0x0 }} /* Min IEEE */
100 };
101 #endif /* vax */
102
103 bool_t
xdr_float(xdrs,fp)104 xdr_float(xdrs, fp)
105 XDR *xdrs;
106 float *fp;
107 {
108 #ifndef IEEEFP
109 struct ieee_single is;
110 struct vax_single vs, *vsp;
111 struct sgl_limits *lim;
112 int i;
113 #endif
114 switch (xdrs->x_op) {
115
116 case XDR_ENCODE:
117 #ifdef IEEEFP
118 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
119 #else
120 vs = *((struct vax_single *)fp);
121 for (i = 0, lim = sgl_limits;
122 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
123 i++, lim++) {
124 if ((vs.mantissa2 == lim->s.mantissa2) &&
125 (vs.exp == lim->s.exp) &&
126 (vs.mantissa1 == lim->s.mantissa1)) {
127 is = lim->ieee;
128 goto shipit;
129 }
130 }
131 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
132 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
133 shipit:
134 is.sign = vs.sign;
135 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
136 #endif
137
138 case XDR_DECODE:
139 #ifdef IEEEFP
140 return (XDR_GETINT32(xdrs, (int32_t *)fp));
141 #else
142 vsp = (struct vax_single *)fp;
143 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
144 return (FALSE);
145 for (i = 0, lim = sgl_limits;
146 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
147 i++, lim++) {
148 if ((is.exp == lim->ieee.exp) &&
149 (is.mantissa == lim->ieee.mantissa)) {
150 *vsp = lim->s;
151 goto doneit;
152 }
153 }
154 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
155 vsp->mantissa2 = is.mantissa;
156 vsp->mantissa1 = (is.mantissa >> 16);
157 doneit:
158 vsp->sign = is.sign;
159 return (TRUE);
160 #endif
161
162 case XDR_FREE:
163 return (TRUE);
164 }
165 /* NOTREACHED */
166 return (FALSE);
167 }
168
169 #if defined(__vax__)
170 /* What IEEE double precision floating point looks like on a Vax */
171 struct ieee_double {
172 unsigned int mantissa1 : 20;
173 unsigned int exp : 11;
174 unsigned int sign : 1;
175 unsigned int mantissa2 : 32;
176 };
177
178 /* Vax double precision floating point */
179 struct vax_double {
180 unsigned int mantissa1 : 7;
181 unsigned int exp : 8;
182 unsigned int sign : 1;
183 unsigned int mantissa2 : 16;
184 unsigned int mantissa3 : 16;
185 unsigned int mantissa4 : 16;
186 };
187
188 #define VAX_DBL_BIAS 0x81
189 #define IEEE_DBL_BIAS 0x3ff
190 #define MASK(nbits) ((1 << nbits) - 1)
191
192 static struct dbl_limits {
193 struct vax_double d;
194 struct ieee_double ieee;
195 } dbl_limits[2] = {
196 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
197 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
198 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
199 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
200 };
201
202 #endif /* vax */
203
204
205 bool_t
xdr_double(xdrs,dp)206 xdr_double(xdrs, dp)
207 XDR *xdrs;
208 double *dp;
209 {
210 #ifdef IEEEFP
211 int32_t *i32p;
212 bool_t rv;
213 #else
214 int32_t *lp;
215 struct ieee_double id;
216 struct vax_double vd;
217 struct dbl_limits *lim;
218 int i;
219 #endif
220
221 switch (xdrs->x_op) {
222
223 case XDR_ENCODE:
224 #ifdef IEEEFP
225 i32p = (int32_t *)(void *)dp;
226 #if BYTE_ORDER == BIG_ENDIAN
227 rv = XDR_PUTINT32(xdrs, i32p);
228 if (!rv)
229 return (rv);
230 rv = XDR_PUTINT32(xdrs, i32p+1);
231 #else
232 rv = XDR_PUTINT32(xdrs, i32p+1);
233 if (!rv)
234 return (rv);
235 rv = XDR_PUTINT32(xdrs, i32p);
236 #endif
237 return (rv);
238 #else
239 vd = *((struct vax_double *)dp);
240 for (i = 0, lim = dbl_limits;
241 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
242 i++, lim++) {
243 if ((vd.mantissa4 == lim->d.mantissa4) &&
244 (vd.mantissa3 == lim->d.mantissa3) &&
245 (vd.mantissa2 == lim->d.mantissa2) &&
246 (vd.mantissa1 == lim->d.mantissa1) &&
247 (vd.exp == lim->d.exp)) {
248 id = lim->ieee;
249 goto shipit;
250 }
251 }
252 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
253 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
254 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
255 (vd.mantissa3 << 13) |
256 ((vd.mantissa4 >> 3) & MASK(13));
257 shipit:
258 id.sign = vd.sign;
259 lp = (int32_t *)&id;
260 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
261 #endif
262
263 case XDR_DECODE:
264 #ifdef IEEEFP
265 i32p = (int32_t *)(void *)dp;
266 #if BYTE_ORDER == BIG_ENDIAN
267 rv = XDR_GETINT32(xdrs, i32p);
268 if (!rv)
269 return (rv);
270 rv = XDR_GETINT32(xdrs, i32p+1);
271 #else
272 rv = XDR_GETINT32(xdrs, i32p+1);
273 if (!rv)
274 return (rv);
275 rv = XDR_GETINT32(xdrs, i32p);
276 #endif
277 return (rv);
278 #else
279 lp = (int32_t *)&id;
280 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
281 return (FALSE);
282 for (i = 0, lim = dbl_limits;
283 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
284 i++, lim++) {
285 if ((id.mantissa2 == lim->ieee.mantissa2) &&
286 (id.mantissa1 == lim->ieee.mantissa1) &&
287 (id.exp == lim->ieee.exp)) {
288 vd = lim->d;
289 goto doneit;
290 }
291 }
292 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
293 vd.mantissa1 = (id.mantissa1 >> 13);
294 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
295 (id.mantissa2 >> 29);
296 vd.mantissa3 = (id.mantissa2 >> 13);
297 vd.mantissa4 = (id.mantissa2 << 3);
298 doneit:
299 vd.sign = id.sign;
300 *dp = *((double *)&vd);
301 return (TRUE);
302 #endif
303
304 case XDR_FREE:
305 return (TRUE);
306 }
307 /* NOTREACHED */
308 return (FALSE);
309 }
310