sunrpc/xdr_float.c

   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)