lib/libc/rpc/xdr_float.c

   1 /*      $NetBSD: xdr_float.c,v 1.40 2014/08/24 17:07:00 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 #include <sys/cdefs.h>
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 #if 0
  37 static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
  38 static char *sccsid = "@(#)xdr_float.c  2.1 88/07/29 4.0 RPCSRC";
  39 #else
  40 __RCSID("$NetBSD: xdr_float.c,v 1.40 2014/08/24 17:07:00 matt Exp $");
  41 #endif
  42 #endif
  43
  44 /*
  45  * xdr_float.c, Generic XDR routines implementation.
  46  *
  47  * Copyright (C) 1984, Sun Microsystems, Inc.
  48  *
  49  * These are the "floating point" xdr routines used to (de)serialize
  50  * most common data items.  See xdr.h for more info on the interface to
  51  * xdr.
  52  */
  53
  54 #include "namespace.h"
  55
  56 #include <sys/types.h>
  57 #include <sys/param.h>
  58
  59 #include <stdio.h>
  60
  61 #include <rpc/types.h>
  62 #include <rpc/xdr.h>
  63
  64 #ifdef __weak_alias
  65 __weak_alias(xdr_double,_xdr_double)
  66 __weak_alias(xdr_float,_xdr_float)
  67 #endif
  68
  69 /*
  70  * NB: Not portable.
  71  * This routine works on machines with IEEE754 FP and Vaxen.
  72  */
  73
  74 #if !defined(__vax__)
  75 #include <machine/endian.h>
  76 #define IEEEFP
  77 #endif
  78
  79 #if defined(__vax__)
  80
  81 /* What IEEE single precision floating point looks like on a Vax */
  82 struct  ieee_single {
  83         unsigned int    mantissa: 23;
  84         unsigned int    exp     : 8;
  85         unsigned int    sign    : 1;
  86 };
  87
  88 /* Vax single precision floating point */
  89 struct  vax_single {
  90         unsigned int    mantissa1 : 7;
  91         unsigned int    exp       : 8;
  92         unsigned int    sign      : 1;
  93         unsigned int    mantissa2 : 16;
  94 };
  95
  96 #define VAX_SNG_BIAS    0x81
  97 #define IEEE_SNG_BIAS   0x7f
  98
  99 static struct sgl_limits {
 100         struct vax_single s;
 101         struct ieee_single ieee;
 102 } sgl_limits[2] = {
 103         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 104         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 105         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 106         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 107 };
 108 #endif /* vax */
 109
 110 bool_t
 111 xdr_float(XDR *xdrs, float *fp)
 112 {
 113 #ifndef IEEEFP
 114         struct ieee_single is;
 115         struct vax_single vs, *vsp;
 116         struct sgl_limits *lim;
 117         size_t i;
 118 #endif
 119         switch (xdrs->x_op) {
 120
 121         case XDR_ENCODE:
 122 #ifdef IEEEFP
 123                 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)fp));
 124 #else
 125                 vs = *((struct vax_single *)(void *)fp);
 126                 for (i = 0, lim = sgl_limits;
 127                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 128                         i++, lim++) {
 129                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 130                                 (vs.exp == lim->s.exp) &&
 131                                 (vs.mantissa1 == lim->s.mantissa1)) {
 132                                 is = lim->ieee;
 133                                 goto shipit;
 134                         }
 135                 }
 136                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 137                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 138         shipit:
 139                 is.sign = vs.sign;
 140                 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)&is));
 141 #endif
 142
 143         case XDR_DECODE:
 144 #ifdef IEEEFP
 145                 return (XDR_GETINT32(xdrs, (int32_t *)(void *)fp));
 146 #else
 147                 vsp = (struct vax_single *)(void *)fp;
 148                 if (!XDR_GETINT32(xdrs, (int32_t *)(void *)&is))
 149                         return (FALSE);
 150                 for (i = 0, lim = sgl_limits;
 151                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 152                         i++, lim++) {
 153                         if ((is.exp == lim->ieee.exp) &&
 154                                 (is.mantissa == lim->ieee.mantissa)) {
 155                                 *vsp = lim->s;
 156                                 goto doneit;
 157                         }
 158                 }
 159                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 160                 vsp->mantissa2 = is.mantissa;
 161                 vsp->mantissa1 = ((unsigned int)is.mantissa >> 16);
 162         doneit:
 163                 vsp->sign = is.sign;
 164                 return (TRUE);
 165 #endif
 166
 167         case XDR_FREE:
 168                 return (TRUE);
 169         }
 170         /* NOTREACHED */
 171         return (FALSE);
 172 }
 173
 174 #if defined(__vax__)
 175 /* What IEEE double precision floating point looks like on a Vax */
 176 struct  ieee_double {
 177         unsigned int    mantissa1 : 20;
 178         unsigned int    exp       : 11;
 179         unsigned int    sign      : 1;
 180         unsigned int    mantissa2 : 32;
 181 };
 182
 183 /* Vax double precision floating point */
 184 struct  vax_double {
 185         unsigned int    mantissa1 : 7;
 186         unsigned int    exp       : 8;
 187         unsigned int    sign      : 1;
 188         unsigned int    mantissa2 : 16;
 189         unsigned int    mantissa3 : 16;
 190         unsigned int    mantissa4 : 16;
 191 };
 192
 193 #define VAX_DBL_BIAS    0x81
 194 #define IEEE_DBL_BIAS   0x3ff
 195 #define MASK(nbits)     ((1 << nbits) - 1)
 196
 197 static struct dbl_limits {
 198         struct  vax_double d;
 199         struct  ieee_double ieee;
 200 } dbl_limits[2] = {
 201         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 202         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 203         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 204         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 205 };
 206
 207 #endif /* vax */
 208
 209
 210 bool_t
 211 xdr_double(XDR *xdrs, double *dp)
 212 {
 213 #ifdef IEEEFP
 214         int32_t *i32p;
 215         bool_t rv;
 216 #else
 217         int32_t *lp;
 218         struct  ieee_double id;
 219         struct  vax_double vd;
 220         struct dbl_limits *lim;
 221         size_t i;
 222 #endif
 223
 224         switch (xdrs->x_op) {
 225
 226         case XDR_ENCODE:
 227 #ifdef IEEEFP
 228                 i32p = (int32_t *)(void *)dp;
 229 #if (BYTE_ORDER == BIG_ENDIAN) || \
 230     (defined(__arm__) && !defined(__VFP_FP__))
 231                 rv = XDR_PUTINT32(xdrs, i32p);
 232                 if (!rv)
 233                         return (rv);
 234                 rv = XDR_PUTINT32(xdrs, i32p+1);
 235 #else
 236                 rv = XDR_PUTINT32(xdrs, i32p+1);
 237                 if (!rv)
 238                         return (rv);
 239                 rv = XDR_PUTINT32(xdrs, i32p);
 240 #endif
 241                 return (rv);
 242 #else
 243                 vd = *((struct vax_double *)(void *)dp);
 244                 for (i = 0, lim = dbl_limits;
 245                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 246                         i++, lim++) {
 247                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 248                                 (vd.mantissa3 == lim->d.mantissa3) &&
 249                                 (vd.mantissa2 == lim->d.mantissa2) &&
 250                                 (vd.mantissa1 == lim->d.mantissa1) &&
 251                                 (vd.exp == lim->d.exp)) {
 252                                 id = lim->ieee;
 253                                 goto shipit;
 254                         }
 255                 }
 256                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 257                 id.mantissa1 = (vd.mantissa1 << 13) |
 258                             ((unsigned int)vd.mantissa2 >> 3);
 259                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 260                                 (vd.mantissa3 << 13) |
 261                                 (((unsigned int)vd.mantissa4 >> 3) & MASK(13));
 262         shipit:
 263                 id.sign = vd.sign;
 264                 lp = (int32_t *)(void *)&id;
 265                 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
 266 #endif
 267
 268         case XDR_DECODE:
 269 #ifdef IEEEFP
 270                 i32p = (int32_t *)(void *)dp;
 271 #if BYTE_ORDER == BIG_ENDIAN || \
 272     (defined(__arm__) && !defined(__VFP_FP__))
 273                 rv = XDR_GETINT32(xdrs, i32p);
 274                 if (!rv)
 275                         return (rv);
 276                 rv = XDR_GETINT32(xdrs, i32p+1);
 277 #else
 278                 rv = XDR_GETINT32(xdrs, i32p+1);
 279                 if (!rv)
 280                         return (rv);
 281                 rv = XDR_GETINT32(xdrs, i32p);
 282 #endif
 283                 return (rv);
 284 #else
 285                 lp = (int32_t *)(void *)&id;
 286                 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
 287                         return (FALSE);
 288                 for (i = 0, lim = dbl_limits;
 289                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 290                         i++, lim++) {
 291                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 292                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 293                                 (id.exp == lim->ieee.exp)) {
 294                                 vd = lim->d;
 295                                 goto doneit;
 296                         }
 297                 }
 298                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 299                 vd.mantissa1 = ((unsigned int)id.mantissa1 >> 13);
 300                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 301                                 ((unsigned int)id.mantissa2 >> 29);
 302                 vd.mantissa3 = ((unsigned int)id.mantissa2 >> 13);
 303                 vd.mantissa4 = (id.mantissa2 << 3);
 304         doneit:
 305                 vd.sign = id.sign;
 306                 *dp = *((double *)(void *)&vd);
 307                 return (TRUE);
 308 #endif
 309
 310         case XDR_FREE:
 311                 return (TRUE);
 312         }
 313         /* NOTREACHED */
 314         return (FALSE);
 315 }