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