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 #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)