xdr_float.c revision 1.10.2.1 1 1.10.2.1 jtc /* $NetBSD: xdr_float.c,v 1.10.2.1 1996/09/16 23:44:44 jtc Exp $ */
2 1.6 cgd
3 1.1 cgd /*
4 1.1 cgd * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
5 1.1 cgd * unrestricted use provided that this legend is included on all tape
6 1.1 cgd * media and as a part of the software program in whole or part. Users
7 1.1 cgd * may copy or modify Sun RPC without charge, but are not authorized
8 1.1 cgd * to license or distribute it to anyone else except as part of a product or
9 1.1 cgd * program developed by the user.
10 1.1 cgd *
11 1.1 cgd * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
12 1.1 cgd * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
13 1.1 cgd * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
14 1.1 cgd *
15 1.1 cgd * Sun RPC is provided with no support and without any obligation on the
16 1.1 cgd * part of Sun Microsystems, Inc. to assist in its use, correction,
17 1.1 cgd * modification or enhancement.
18 1.1 cgd *
19 1.1 cgd * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
20 1.1 cgd * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
21 1.1 cgd * OR ANY PART THEREOF.
22 1.1 cgd *
23 1.1 cgd * In no event will Sun Microsystems, Inc. be liable for any lost revenue
24 1.1 cgd * or profits or other special, indirect and consequential damages, even if
25 1.1 cgd * Sun has been advised of the possibility of such damages.
26 1.1 cgd *
27 1.1 cgd * Sun Microsystems, Inc.
28 1.1 cgd * 2550 Garcia Avenue
29 1.1 cgd * Mountain View, California 94043
30 1.1 cgd */
31 1.1 cgd
32 1.1 cgd #if defined(LIBC_SCCS) && !defined(lint)
33 1.1 cgd /*static char *sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/
34 1.1 cgd /*static char *sccsid = "from: @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";*/
35 1.10.2.1 jtc static char *rcsid = "$NetBSD: xdr_float.c,v 1.10.2.1 1996/09/16 23:44:44 jtc Exp $";
36 1.1 cgd #endif
37 1.1 cgd
38 1.1 cgd /*
39 1.1 cgd * xdr_float.c, Generic XDR routines impelmentation.
40 1.1 cgd *
41 1.1 cgd * Copyright (C) 1984, Sun Microsystems, Inc.
42 1.1 cgd *
43 1.1 cgd * These are the "floating point" xdr routines used to (de)serialize
44 1.1 cgd * most common data items. See xdr.h for more info on the interface to
45 1.1 cgd * xdr.
46 1.1 cgd */
47 1.1 cgd
48 1.10.2.1 jtc #include "namespace.h"
49 1.1 cgd #include <stdio.h>
50 1.1 cgd #include <sys/types.h>
51 1.1 cgd #include <sys/param.h>
52 1.1 cgd #include <rpc/types.h>
53 1.1 cgd #include <rpc/xdr.h>
54 1.10.2.1 jtc
55 1.10.2.1 jtc #ifdef __weak_alias
56 1.10.2.1 jtc __weak_alias(xdr_double,_xdr_double);
57 1.10.2.1 jtc __weak_alias(xdr_float,_xdr_float);
58 1.10.2.1 jtc #endif
59 1.1 cgd
60 1.1 cgd /*
61 1.1 cgd * NB: Not portable.
62 1.7 jtc * This routine works on machines with IEEE754 FP and Vaxen.
63 1.1 cgd */
64 1.1 cgd
65 1.5 cgd #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
66 1.10 mark defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
67 1.10 mark defined(__arm32__)
68 1.7 jtc #include <machine/endian.h>
69 1.1 cgd #define IEEEFP
70 1.1 cgd #endif
71 1.1 cgd
72 1.1 cgd #ifdef vax
73 1.1 cgd
74 1.1 cgd /* What IEEE single precision floating point looks like on a Vax */
75 1.1 cgd struct ieee_single {
76 1.1 cgd unsigned int mantissa: 23;
77 1.1 cgd unsigned int exp : 8;
78 1.1 cgd unsigned int sign : 1;
79 1.1 cgd };
80 1.1 cgd
81 1.1 cgd /* Vax single precision floating point */
82 1.1 cgd struct vax_single {
83 1.1 cgd unsigned int mantissa1 : 7;
84 1.1 cgd unsigned int exp : 8;
85 1.1 cgd unsigned int sign : 1;
86 1.1 cgd unsigned int mantissa2 : 16;
87 1.1 cgd };
88 1.1 cgd
89 1.1 cgd #define VAX_SNG_BIAS 0x81
90 1.1 cgd #define IEEE_SNG_BIAS 0x7f
91 1.1 cgd
92 1.1 cgd static struct sgl_limits {
93 1.1 cgd struct vax_single s;
94 1.1 cgd struct ieee_single ieee;
95 1.1 cgd } sgl_limits[2] = {
96 1.1 cgd {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
97 1.1 cgd { 0x0, 0xff, 0x0 }}, /* Max IEEE */
98 1.1 cgd {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
99 1.1 cgd { 0x0, 0x0, 0x0 }} /* Min IEEE */
100 1.1 cgd };
101 1.1 cgd #endif /* vax */
102 1.1 cgd
103 1.1 cgd bool_t
104 1.1 cgd xdr_float(xdrs, fp)
105 1.1 cgd register XDR *xdrs;
106 1.1 cgd register float *fp;
107 1.1 cgd {
108 1.4 cgd #ifdef IEEEFP
109 1.4 cgd bool_t rv;
110 1.4 cgd long tmpl;
111 1.4 cgd #else
112 1.1 cgd struct ieee_single is;
113 1.1 cgd struct vax_single vs, *vsp;
114 1.1 cgd struct sgl_limits *lim;
115 1.1 cgd int i;
116 1.1 cgd #endif
117 1.1 cgd switch (xdrs->x_op) {
118 1.1 cgd
119 1.1 cgd case XDR_ENCODE:
120 1.1 cgd #ifdef IEEEFP
121 1.4 cgd tmpl = *(int32_t *)fp;
122 1.4 cgd return (XDR_PUTLONG(xdrs, &tmpl));
123 1.1 cgd #else
124 1.1 cgd vs = *((struct vax_single *)fp);
125 1.1 cgd for (i = 0, lim = sgl_limits;
126 1.1 cgd i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
127 1.1 cgd i++, lim++) {
128 1.1 cgd if ((vs.mantissa2 == lim->s.mantissa2) &&
129 1.1 cgd (vs.exp == lim->s.exp) &&
130 1.1 cgd (vs.mantissa1 == lim->s.mantissa1)) {
131 1.1 cgd is = lim->ieee;
132 1.1 cgd goto shipit;
133 1.1 cgd }
134 1.1 cgd }
135 1.1 cgd is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
136 1.1 cgd is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
137 1.1 cgd shipit:
138 1.1 cgd is.sign = vs.sign;
139 1.1 cgd return (XDR_PUTLONG(xdrs, (long *)&is));
140 1.1 cgd #endif
141 1.1 cgd
142 1.1 cgd case XDR_DECODE:
143 1.1 cgd #ifdef IEEEFP
144 1.4 cgd rv = XDR_GETLONG(xdrs, &tmpl);
145 1.4 cgd *(int32_t *)fp = tmpl;
146 1.4 cgd return (rv);
147 1.1 cgd #else
148 1.1 cgd vsp = (struct vax_single *)fp;
149 1.1 cgd if (!XDR_GETLONG(xdrs, (long *)&is))
150 1.1 cgd return (FALSE);
151 1.1 cgd for (i = 0, lim = sgl_limits;
152 1.1 cgd i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
153 1.1 cgd i++, lim++) {
154 1.1 cgd if ((is.exp == lim->ieee.exp) &&
155 1.1 cgd (is.mantissa == lim->ieee.mantissa)) {
156 1.1 cgd *vsp = lim->s;
157 1.1 cgd goto doneit;
158 1.1 cgd }
159 1.1 cgd }
160 1.1 cgd vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
161 1.1 cgd vsp->mantissa2 = is.mantissa;
162 1.1 cgd vsp->mantissa1 = (is.mantissa >> 16);
163 1.1 cgd doneit:
164 1.1 cgd vsp->sign = is.sign;
165 1.1 cgd return (TRUE);
166 1.1 cgd #endif
167 1.1 cgd
168 1.1 cgd case XDR_FREE:
169 1.1 cgd return (TRUE);
170 1.1 cgd }
171 1.1 cgd return (FALSE);
172 1.1 cgd }
173 1.1 cgd
174 1.1 cgd #ifdef vax
175 1.1 cgd /* What IEEE double precision floating point looks like on a Vax */
176 1.1 cgd struct ieee_double {
177 1.1 cgd unsigned int mantissa1 : 20;
178 1.1 cgd unsigned int exp : 11;
179 1.1 cgd unsigned int sign : 1;
180 1.1 cgd unsigned int mantissa2 : 32;
181 1.1 cgd };
182 1.1 cgd
183 1.1 cgd /* Vax double precision floating point */
184 1.1 cgd struct vax_double {
185 1.1 cgd unsigned int mantissa1 : 7;
186 1.1 cgd unsigned int exp : 8;
187 1.1 cgd unsigned int sign : 1;
188 1.1 cgd unsigned int mantissa2 : 16;
189 1.1 cgd unsigned int mantissa3 : 16;
190 1.1 cgd unsigned int mantissa4 : 16;
191 1.1 cgd };
192 1.1 cgd
193 1.1 cgd #define VAX_DBL_BIAS 0x81
194 1.1 cgd #define IEEE_DBL_BIAS 0x3ff
195 1.1 cgd #define MASK(nbits) ((1 << nbits) - 1)
196 1.1 cgd
197 1.1 cgd static struct dbl_limits {
198 1.1 cgd struct vax_double d;
199 1.1 cgd struct ieee_double ieee;
200 1.1 cgd } dbl_limits[2] = {
201 1.1 cgd {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
202 1.1 cgd { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
203 1.1 cgd {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
204 1.1 cgd { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
205 1.1 cgd };
206 1.1 cgd
207 1.1 cgd #endif /* vax */
208 1.1 cgd
209 1.1 cgd
210 1.1 cgd bool_t
211 1.1 cgd xdr_double(xdrs, dp)
212 1.1 cgd register XDR *xdrs;
213 1.1 cgd double *dp;
214 1.1 cgd {
215 1.4 cgd #ifdef IEEEFP
216 1.4 cgd register int32_t *i32p;
217 1.4 cgd bool_t rv;
218 1.4 cgd long tmpl;
219 1.4 cgd #else
220 1.1 cgd register long *lp;
221 1.1 cgd struct ieee_double id;
222 1.1 cgd struct vax_double vd;
223 1.1 cgd register struct dbl_limits *lim;
224 1.1 cgd int i;
225 1.1 cgd #endif
226 1.1 cgd
227 1.1 cgd switch (xdrs->x_op) {
228 1.1 cgd
229 1.1 cgd case XDR_ENCODE:
230 1.1 cgd #ifdef IEEEFP
231 1.4 cgd i32p = (int32_t *)dp;
232 1.1 cgd #if BYTE_ORDER == BIG_ENDIAN
233 1.4 cgd tmpl = *i32p++;
234 1.4 cgd rv = XDR_PUTLONG(xdrs, &tmpl);
235 1.4 cgd if (!rv)
236 1.4 cgd return (rv);
237 1.4 cgd tmpl = *i32p;
238 1.4 cgd rv = XDR_PUTLONG(xdrs, &tmpl);
239 1.1 cgd #else
240 1.9 pk tmpl = *(i32p+1);
241 1.4 cgd rv = XDR_PUTLONG(xdrs, &tmpl);
242 1.4 cgd if (!rv)
243 1.4 cgd return (rv);
244 1.4 cgd tmpl = *i32p;
245 1.4 cgd rv = XDR_PUTLONG(xdrs, &tmpl);
246 1.1 cgd #endif
247 1.4 cgd return (rv);
248 1.1 cgd #else
249 1.1 cgd vd = *((struct vax_double *)dp);
250 1.1 cgd for (i = 0, lim = dbl_limits;
251 1.1 cgd i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
252 1.1 cgd i++, lim++) {
253 1.1 cgd if ((vd.mantissa4 == lim->d.mantissa4) &&
254 1.1 cgd (vd.mantissa3 == lim->d.mantissa3) &&
255 1.1 cgd (vd.mantissa2 == lim->d.mantissa2) &&
256 1.1 cgd (vd.mantissa1 == lim->d.mantissa1) &&
257 1.1 cgd (vd.exp == lim->d.exp)) {
258 1.1 cgd id = lim->ieee;
259 1.1 cgd goto shipit;
260 1.1 cgd }
261 1.1 cgd }
262 1.1 cgd id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
263 1.1 cgd id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
264 1.1 cgd id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
265 1.1 cgd (vd.mantissa3 << 13) |
266 1.1 cgd ((vd.mantissa4 >> 3) & MASK(13));
267 1.1 cgd shipit:
268 1.1 cgd id.sign = vd.sign;
269 1.1 cgd lp = (long *)&id;
270 1.1 cgd return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
271 1.1 cgd #endif
272 1.1 cgd
273 1.1 cgd case XDR_DECODE:
274 1.1 cgd #ifdef IEEEFP
275 1.4 cgd i32p = (int32_t *)dp;
276 1.1 cgd #if BYTE_ORDER == BIG_ENDIAN
277 1.4 cgd rv = XDR_GETLONG(xdrs, &tmpl);
278 1.4 cgd *i32p++ = tmpl;
279 1.4 cgd if (!rv)
280 1.4 cgd return (rv);
281 1.4 cgd rv = XDR_GETLONG(xdrs, &tmpl);
282 1.4 cgd *i32p = tmpl;
283 1.1 cgd #else
284 1.4 cgd rv = XDR_GETLONG(xdrs, &tmpl);
285 1.4 cgd *(i32p+1) = tmpl;
286 1.4 cgd if (!rv)
287 1.4 cgd return (rv);
288 1.4 cgd rv = XDR_GETLONG(xdrs, &tmpl);
289 1.4 cgd *i32p = tmpl;
290 1.1 cgd #endif
291 1.4 cgd return (rv);
292 1.1 cgd #else
293 1.1 cgd lp = (long *)&id;
294 1.1 cgd if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
295 1.1 cgd return (FALSE);
296 1.1 cgd for (i = 0, lim = dbl_limits;
297 1.1 cgd i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
298 1.1 cgd i++, lim++) {
299 1.1 cgd if ((id.mantissa2 == lim->ieee.mantissa2) &&
300 1.1 cgd (id.mantissa1 == lim->ieee.mantissa1) &&
301 1.1 cgd (id.exp == lim->ieee.exp)) {
302 1.1 cgd vd = lim->d;
303 1.1 cgd goto doneit;
304 1.1 cgd }
305 1.1 cgd }
306 1.1 cgd vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
307 1.1 cgd vd.mantissa1 = (id.mantissa1 >> 13);
308 1.1 cgd vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
309 1.1 cgd (id.mantissa2 >> 29);
310 1.1 cgd vd.mantissa3 = (id.mantissa2 >> 13);
311 1.1 cgd vd.mantissa4 = (id.mantissa2 << 3);
312 1.1 cgd doneit:
313 1.1 cgd vd.sign = id.sign;
314 1.1 cgd *dp = *((double *)&vd);
315 1.1 cgd return (TRUE);
316 1.1 cgd #endif
317 1.1 cgd
318 1.1 cgd case XDR_FREE:
319 1.1 cgd return (TRUE);
320 1.1 cgd }
321 1.1 cgd return (FALSE);
322 1.1 cgd }
323