1 /*
2 * xdr_float.c, Generic XDR routines implementation.
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 * These are the "floating point" xdr routines used to (de)serialize
34 * most common data items. See xdr.h for more info on the interface to
35 * xdr.
36 */
37
38 #include <stdio.h>
39 #include <endian.h>
40
41 #include <rpc/types.h>
42 #include <rpc/xdr.h>
43 #include <shlib-compat.h>
44
45 /*
46 * NB: Not portable.
47 * This routine works on Suns (Sky / 68000's) and Vaxen.
48 */
49
50 #define LSW (__FLOAT_WORD_ORDER == __BIG_ENDIAN)
51
52 #ifdef vax
53
54 /* What IEEE single precision floating point looks like on a Vax */
55 struct ieee_single {
56 unsigned int mantissa: 23;
57 unsigned int exp : 8;
58 unsigned int sign : 1;
59 };
60
61 /* Vax single precision floating point */
62 struct vax_single {
63 unsigned int mantissa1 : 7;
64 unsigned int exp : 8;
65 unsigned int sign : 1;
66 unsigned int mantissa2 : 16;
67 };
68
69 #define VAX_SNG_BIAS 0x81
70 #define IEEE_SNG_BIAS 0x7f
71
72 static struct sgl_limits {
73 struct vax_single s;
74 struct ieee_single ieee;
75 } sgl_limits[2] = {
76 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
77 { 0x0, 0xff, 0x0 }}, /* Max IEEE */
78 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
79 { 0x0, 0x0, 0x0 }} /* Min IEEE */
80 };
81 #endif /* vax */
82
83 bool_t
84 xdr_float (XDR *xdrs, float *fp)
85 {
86 #ifdef vax
87 struct ieee_single is;
88 struct vax_single vs, *vsp;
89 struct sgl_limits *lim;
90 int i;
91 #endif
92 switch (xdrs->x_op) {
93
94 case XDR_ENCODE:
95 #ifdef vax
96 vs = *((struct vax_single *)fp);
97 for (i = 0, lim = sgl_limits;
98 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
99 i++, lim++) {
100 if ((vs.mantissa2 == lim->s.mantissa2) &&
101 (vs.exp == lim->s.exp) &&
102 (vs.mantissa1 == lim->s.mantissa1)) {
103 is = lim->ieee;
104 goto shipit;
105 }
106 }
107 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
108 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
109 shipit:
110 is.sign = vs.sign;
111 return (XDR_PUTLONG(xdrs, (long *)&is));
112 #else
113 if (sizeof(float) == sizeof(long))
114 return (XDR_PUTLONG(xdrs, (long *)fp));
115 else if (sizeof(float) == sizeof(int)) {
116 long tmp = *(int *)fp;
117 return (XDR_PUTLONG(xdrs, &tmp));
118 }
119 break;
120 #endif
121
122 case XDR_DECODE:
123 #ifdef vax
124 vsp = (struct vax_single *)fp;
125 if (!XDR_GETLONG(xdrs, (long *)&is))
126 return (FALSE);
127 for (i = 0, lim = sgl_limits;
128 i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
129 i++, lim++) {
130 if ((is.exp == lim->ieee.exp) &&
131 (is.mantissa == lim->ieee.mantissa)) {
132 *vsp = lim->s;
133 goto doneit;
134 }
135 }
136 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
137 vsp->mantissa2 = is.mantissa;
138 vsp->mantissa1 = (is.mantissa >> 16);
139 doneit:
140 vsp->sign = is.sign;
141 return (TRUE);
142 #else
143 if (sizeof(float) == sizeof(long))
144 return (XDR_GETLONG(xdrs, (long *)fp));
145 else if (sizeof(float) == sizeof(int)) {
146 long tmp;
147 if (XDR_GETLONG(xdrs, &tmp)) {
148 *(int *)fp = tmp;
149 return (TRUE);
150 }
151 }
152 break;
153 #endif
154
155 case XDR_FREE:
156 return (TRUE);
157 }
158 return (FALSE);
159 }
160 libc_hidden_nolink_sunrpc (xdr_float, GLIBC_2_0)
161
162 /*
163 * This routine works on Suns (Sky / 68000's) and Vaxen.
164 */
165
166 #ifdef vax
167 /* What IEEE double precision floating point looks like on a Vax */
168 struct ieee_double {
169 unsigned int mantissa1 : 20;
170 unsigned int exp : 11;
171 unsigned int sign : 1;
172 unsigned int mantissa2 : 32;
173 };
174
175 /* Vax double precision floating point */
176 struct vax_double {
177 unsigned int mantissa1 : 7;
178 unsigned int exp : 8;
179 unsigned int sign : 1;
180 unsigned int mantissa2 : 16;
181 unsigned int mantissa3 : 16;
182 unsigned int mantissa4 : 16;
183 };
184
185 #define VAX_DBL_BIAS 0x81
186 #define IEEE_DBL_BIAS 0x3ff
187 #define MASK(nbits) ((1 << nbits) - 1)
188
189 static struct dbl_limits {
190 struct vax_double d;
191 struct ieee_double ieee;
192 } dbl_limits[2] = {
193 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
194 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
195 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
196 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
197 };
198
199 #endif /* vax */
200
201
202 bool_t
203 xdr_double (XDR *xdrs, double *dp)
204 {
205 #ifdef vax
206 struct ieee_double id;
207 struct vax_double vd;
208 register struct dbl_limits *lim;
209 int i;
210 #endif
211
212 switch (xdrs->x_op) {
213
214 case XDR_ENCODE:
215 #ifdef vax
216 vd = *((struct vax_double *)dp);
217 for (i = 0, lim = dbl_limits;
218 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
219 i++, lim++) {
220 if ((vd.mantissa4 == lim->d.mantissa4) &&
221 (vd.mantissa3 == lim->d.mantissa3) &&
222 (vd.mantissa2 == lim->d.mantissa2) &&
223 (vd.mantissa1 == lim->d.mantissa1) &&
224 (vd.exp == lim->d.exp)) {
225 id = lim->ieee;
226 goto shipit;
227 }
228 }
229 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
230 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
231 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
232 (vd.mantissa3 << 13) |
233 ((vd.mantissa4 >> 3) & MASK(13));
234 shipit:
235 id.sign = vd.sign;
236 dp = (double *)&id;
237 #endif
238 if (2*sizeof(long) == sizeof(double)) {
239 long *lp = (long *)dp;
240 return (XDR_PUTLONG(xdrs, lp+!LSW) &&
241 XDR_PUTLONG(xdrs, lp+LSW));
242 } else if (2*sizeof(int) == sizeof(double)) {
243 int *ip = (int *)dp;
244 long tmp[2];
245 tmp[0] = ip[!LSW];
246 tmp[1] = ip[LSW];
247 return (XDR_PUTLONG(xdrs, tmp) &&
248 XDR_PUTLONG(xdrs, tmp+1));
249 }
250 break;
251
252 case XDR_DECODE:
253 #ifdef vax
254 lp = (long *)&id;
255 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
256 return (FALSE);
257 for (i = 0, lim = dbl_limits;
258 i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
259 i++, lim++) {
260 if ((id.mantissa2 == lim->ieee.mantissa2) &&
261 (id.mantissa1 == lim->ieee.mantissa1) &&
262 (id.exp == lim->ieee.exp)) {
263 vd = lim->d;
264 goto doneit;
265 }
266 }
267 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
268 vd.mantissa1 = (id.mantissa1 >> 13);
269 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
270 (id.mantissa2 >> 29);
271 vd.mantissa3 = (id.mantissa2 >> 13);
272 vd.mantissa4 = (id.mantissa2 << 3);
273 doneit:
274 vd.sign = id.sign;
275 *dp = *((double *)&vd);
276 return (TRUE);
277 #else
278 if (2*sizeof(long) == sizeof(double)) {
279 long *lp = (long *)dp;
280 return (XDR_GETLONG(xdrs, lp+!LSW) &&
281 XDR_GETLONG(xdrs, lp+LSW));
282 } else if (2*sizeof(int) == sizeof(double)) {
283 int *ip = (int *)dp;
284 long tmp[2];
285 if (XDR_GETLONG(xdrs, tmp+!LSW) &&
286 XDR_GETLONG(xdrs, tmp+LSW)) {
287 ip[0] = tmp[0];
288 ip[1] = tmp[1];
289 return (TRUE);
290 }
291 }
292 break;
293 #endif
294
295 case XDR_FREE:
296 return (TRUE);
297 }
298 return (FALSE);
299 }
300 libc_hidden_nolink_sunrpc (xdr_double, GLIBC_2_0)