sunrpc/xdr_float.c

   1 /*
   2  * xdr_float.c, Generic XDR routines implementation.
   3  *
   4  * Copyright (C) 1984, Sun Microsystems, 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 Sun Microsystems, 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(xdrs, fp)
  84      XDR *xdrs;
  85      float *fp;
  86 {
  87 #ifdef vax
  88         struct ieee_single is;
  89         struct vax_single vs, *vsp;
  90         struct sgl_limits *lim;
  91         int i;
  92 #endif
  93         switch (xdrs->x_op) {
  94
  95         case XDR_ENCODE:
  96 #ifdef vax
  97                 vs = *((struct vax_single *)fp);
  98                 for (i = 0, lim = sgl_limits;
  99                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 100                         i++, lim++) {
 101                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 102                                 (vs.exp == lim->s.exp) &&
 103                                 (vs.mantissa1 == lim->s.mantissa1)) {
 104                                 is = lim->ieee;
 105                                 goto shipit;
 106                         }
 107                 }
 108                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 109                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 110         shipit:
 111                 is.sign = vs.sign;
 112                 return (XDR_PUTLONG(xdrs, (long *)&is));
 113 #else
 114                 if (sizeof(float) == sizeof(long))
 115                         return (XDR_PUTLONG(xdrs, (long *)fp));
 116                 else if (sizeof(float) == sizeof(int)) {
 117                         long tmp = *(int *)fp;
 118                         return (XDR_PUTLONG(xdrs, &tmp));
 119                 }
 120                 break;
 121 #endif
 122
 123         case XDR_DECODE:
 124 #ifdef vax
 125                 vsp = (struct vax_single *)fp;
 126                 if (!XDR_GETLONG(xdrs, (long *)&is))
 127                         return (FALSE);
 128                 for (i = 0, lim = sgl_limits;
 129                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 130                         i++, lim++) {
 131                         if ((is.exp == lim->ieee.exp) &&
 132                                 (is.mantissa == lim->ieee.mantissa)) {
 133                                 *vsp = lim->s;
 134                                 goto doneit;
 135                         }
 136                 }
 137                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 138                 vsp->mantissa2 = is.mantissa;
 139                 vsp->mantissa1 = (is.mantissa >> 16);
 140         doneit:
 141                 vsp->sign = is.sign;
 142                 return (TRUE);
 143 #else
 144                 if (sizeof(float) == sizeof(long))
 145                         return (XDR_GETLONG(xdrs, (long *)fp));
 146                 else if (sizeof(float) == sizeof(int)) {
 147                         long tmp;
 148                         if (XDR_GETLONG(xdrs, &tmp)) {
 149                                 *(int *)fp = tmp;
 150                                 return (TRUE);
 151                         }
 152                 }
 153                 break;
 154 #endif
 155
 156         case XDR_FREE:
 157                 return (TRUE);
 158         }
 159         return (FALSE);
 160 }
 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(xdrs, dp)
 204      XDR *xdrs;
 205      double *dp;
 206 {
 207 #ifdef vax
 208         struct  ieee_double id;
 209         struct  vax_double vd;
 210         register struct dbl_limits *lim;
 211         int i;
 212 #endif
 213
 214         switch (xdrs->x_op) {
 215
 216         case XDR_ENCODE:
 217 #ifdef vax
 218                 vd = *((struct vax_double *)dp);
 219                 for (i = 0, lim = dbl_limits;
 220                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 221                         i++, lim++) {
 222                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 223                                 (vd.mantissa3 == lim->d.mantissa3) &&
 224                                 (vd.mantissa2 == lim->d.mantissa2) &&
 225                                 (vd.mantissa1 == lim->d.mantissa1) &&
 226                                 (vd.exp == lim->d.exp)) {
 227                                 id = lim->ieee;
 228                                 goto shipit;
 229                         }
 230                 }
 231                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 232                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 233                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 234                                 (vd.mantissa3 << 13) |
 235                                 ((vd.mantissa4 >> 3) & MASK(13));
 236         shipit:
 237                 id.sign = vd.sign;
 238                 dp = (double *)&id;
 239 #endif
 240                 if (2*sizeof(long) == sizeof(double)) {
 241                         long *lp = (long *)dp;
 242                         return (XDR_PUTLONG(xdrs, lp+!LSW) &&
 243                                 XDR_PUTLONG(xdrs, lp+LSW));
 244                 } else if (2*sizeof(int) == sizeof(double)) {
 245                         int *ip = (int *)dp;
 246                         long tmp[2];
 247                         tmp[0] = ip[!LSW];
 248                         tmp[1] = ip[LSW];
 249                         return (XDR_PUTLONG(xdrs, tmp) &&
 250                                 XDR_PUTLONG(xdrs, tmp+1));
 251                 }
 252                 break;
 253
 254         case XDR_DECODE:
 255 #ifdef vax
 256                 lp = (long *)&id;
 257                 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
 258                         return (FALSE);
 259                 for (i = 0, lim = dbl_limits;
 260                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 261                         i++, lim++) {
 262                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 263                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 264                                 (id.exp == lim->ieee.exp)) {
 265                                 vd = lim->d;
 266                                 goto doneit;
 267                         }
 268                 }
 269                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 270                 vd.mantissa1 = (id.mantissa1 >> 13);
 271                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 272                                 (id.mantissa2 >> 29);
 273                 vd.mantissa3 = (id.mantissa2 >> 13);
 274                 vd.mantissa4 = (id.mantissa2 << 3);
 275         doneit:
 276                 vd.sign = id.sign;
 277                 *dp = *((double *)&vd);
 278                 return (TRUE);
 279 #else
 280                 if (2*sizeof(long) == sizeof(double)) {
 281                         long *lp = (long *)dp;
 282                         return (XDR_GETLONG(xdrs, lp+!LSW) &&
 283                                 XDR_GETLONG(xdrs, lp+LSW));
 284                 } else if (2*sizeof(int) == sizeof(double)) {
 285                         int *ip = (int *)dp;
 286                         long tmp[2];
 287                         if (XDR_GETLONG(xdrs, tmp+!LSW) &&
 288                             XDR_GETLONG(xdrs, tmp+LSW)) {
 289                                 ip[0] = tmp[0];
 290                                 ip[1] = tmp[1];
 291                                 return (TRUE);
 292                         }
 293                 }
 294                 break;
 295 #endif
 296
 297         case XDR_FREE:
 298                 return (TRUE);
 299         }
 300         return (FALSE);
 301 }