lib/libc/rpc/xdr_float.c

   1 /*      $NetBSD: xdr_float.c,v 1.38 2013/03/11 20:19:29 tron 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 1.38 2013/03/11 20:19:29 tron 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(__m68k__) || defined(__sparc__) || defined(__i386__) || \
  75     defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
  76     defined(__arm__) || defined(__powerpc__) || defined(__sh__) || \
  77     defined(__x86_64__) || defined(__hppa__) || defined(__ia64__)
  78 #include <machine/endian.h>
  79 #define IEEEFP
  80 #endif
  81
  82 #if defined(__vax__)
  83
  84 /* What IEEE single precision floating point looks like on a Vax */
  85 struct  ieee_single {
  86         unsigned int    mantissa: 23;
  87         unsigned int    exp     : 8;
  88         unsigned int    sign    : 1;
  89 };
  90
  91 /* Vax single precision floating point */
  92 struct  vax_single {
  93         unsigned int    mantissa1 : 7;
  94         unsigned int    exp       : 8;
  95         unsigned int    sign      : 1;
  96         unsigned int    mantissa2 : 16;
  97 };
  98
  99 #define VAX_SNG_BIAS    0x81
 100 #define IEEE_SNG_BIAS   0x7f
 101
 102 static struct sgl_limits {
 103         struct vax_single s;
 104         struct ieee_single ieee;
 105 } sgl_limits[2] = {
 106         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 107         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 108         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 109         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 110 };
 111 #endif /* vax */
 112
 113 bool_t
 114 xdr_float(XDR *xdrs, float *fp)
 115 {
 116 #ifndef IEEEFP
 117         struct ieee_single is;
 118         struct vax_single vs, *vsp;
 119         struct sgl_limits *lim;
 120         size_t i;
 121 #endif
 122         switch (xdrs->x_op) {
 123
 124         case XDR_ENCODE:
 125 #ifdef IEEEFP
 126                 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)fp));
 127 #else
 128                 vs = *((struct vax_single *)(void *)fp);
 129                 for (i = 0, lim = sgl_limits;
 130                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 131                         i++, lim++) {
 132                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 133                                 (vs.exp == lim->s.exp) &&
 134                                 (vs.mantissa1 == lim->s.mantissa1)) {
 135                                 is = lim->ieee;
 136                                 goto shipit;
 137                         }
 138                 }
 139                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 140                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 141         shipit:
 142                 is.sign = vs.sign;
 143                 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)&is));
 144 #endif
 145
 146         case XDR_DECODE:
 147 #ifdef IEEEFP
 148                 return (XDR_GETINT32(xdrs, (int32_t *)(void *)fp));
 149 #else
 150                 vsp = (struct vax_single *)(void *)fp;
 151                 if (!XDR_GETINT32(xdrs, (int32_t *)(void *)&is))
 152                         return (FALSE);
 153                 for (i = 0, lim = sgl_limits;
 154                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 155                         i++, lim++) {
 156                         if ((is.exp == lim->ieee.exp) &&
 157                                 (is.mantissa == lim->ieee.mantissa)) {
 158                                 *vsp = lim->s;
 159                                 goto doneit;
 160                         }
 161                 }
 162                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 163                 vsp->mantissa2 = is.mantissa;
 164                 vsp->mantissa1 = ((unsigned int)is.mantissa >> 16);
 165         doneit:
 166                 vsp->sign = is.sign;
 167                 return (TRUE);
 168 #endif
 169
 170         case XDR_FREE:
 171                 return (TRUE);
 172         }
 173         /* NOTREACHED */
 174         return (FALSE);
 175 }
 176
 177 #if defined(__vax__)
 178 /* What IEEE double precision floating point looks like on a Vax */
 179 struct  ieee_double {
 180         unsigned int    mantissa1 : 20;
 181         unsigned int    exp       : 11;
 182         unsigned int    sign      : 1;
 183         unsigned int    mantissa2 : 32;
 184 };
 185
 186 /* Vax double precision floating point */
 187 struct  vax_double {
 188         unsigned int    mantissa1 : 7;
 189         unsigned int    exp       : 8;
 190         unsigned int    sign      : 1;
 191         unsigned int    mantissa2 : 16;
 192         unsigned int    mantissa3 : 16;
 193         unsigned int    mantissa4 : 16;
 194 };
 195
 196 #define VAX_DBL_BIAS    0x81
 197 #define IEEE_DBL_BIAS   0x3ff
 198 #define MASK(nbits)     ((1 << nbits) - 1)
 199
 200 static struct dbl_limits {
 201         struct  vax_double d;
 202         struct  ieee_double ieee;
 203 } dbl_limits[2] = {
 204         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 205         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 206         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 207         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 208 };
 209
 210 #endif /* vax */
 211
 212
 213 bool_t
 214 xdr_double(XDR *xdrs, double *dp)
 215 {
 216 #ifdef IEEEFP
 217         int32_t *i32p;
 218         bool_t rv;
 219 #else
 220         int32_t *lp;
 221         struct  ieee_double id;
 222         struct  vax_double vd;
 223         struct dbl_limits *lim;
 224         size_t i;
 225 #endif
 226
 227         switch (xdrs->x_op) {
 228
 229         case XDR_ENCODE:
 230 #ifdef IEEEFP
 231                 i32p = (int32_t *)(void *)dp;
 232 #if (BYTE_ORDER == BIG_ENDIAN) || \
 233     (defined(__arm__) && !defined(__VFP_FP__))
 234                 rv = XDR_PUTINT32(xdrs, i32p);
 235                 if (!rv)
 236                         return (rv);
 237                 rv = XDR_PUTINT32(xdrs, i32p+1);
 238 #else
 239                 rv = XDR_PUTINT32(xdrs, i32p+1);
 240                 if (!rv)
 241                         return (rv);
 242                 rv = XDR_PUTINT32(xdrs, i32p);
 243 #endif
 244                 return (rv);
 245 #else
 246                 vd = *((struct vax_double *)(void *)dp);
 247                 for (i = 0, lim = dbl_limits;
 248                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 249                         i++, lim++) {
 250                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 251                                 (vd.mantissa3 == lim->d.mantissa3) &&
 252                                 (vd.mantissa2 == lim->d.mantissa2) &&
 253                                 (vd.mantissa1 == lim->d.mantissa1) &&
 254                                 (vd.exp == lim->d.exp)) {
 255                                 id = lim->ieee;
 256                                 goto shipit;
 257                         }
 258                 }
 259                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 260                 id.mantissa1 = (vd.mantissa1 << 13) |
 261                             ((unsigned int)vd.mantissa2 >> 3);
 262                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 263                                 (vd.mantissa3 << 13) |
 264                                 (((unsigned int)vd.mantissa4 >> 3) & MASK(13));
 265         shipit:
 266                 id.sign = vd.sign;
 267                 lp = (int32_t *)(void *)&id;
 268                 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
 269 #endif
 270
 271         case XDR_DECODE:
 272 #ifdef IEEEFP
 273                 i32p = (int32_t *)(void *)dp;
 274 #if BYTE_ORDER == BIG_ENDIAN || \
 275     (defined(__arm__) && !defined(__VFP_FP__))
 276                 rv = XDR_GETINT32(xdrs, i32p);
 277                 if (!rv)
 278                         return (rv);
 279                 rv = XDR_GETINT32(xdrs, i32p+1);
 280 #else
 281                 rv = XDR_GETINT32(xdrs, i32p+1);
 282                 if (!rv)
 283                         return (rv);
 284                 rv = XDR_GETINT32(xdrs, i32p);
 285 #endif
 286                 return (rv);
 287 #else
 288                 lp = (int32_t *)(void *)&id;
 289                 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
 290                         return (FALSE);
 291                 for (i = 0, lim = dbl_limits;
 292                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 293                         i++, lim++) {
 294                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 295                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 296                                 (id.exp == lim->ieee.exp)) {
 297                                 vd = lim->d;
 298                                 goto doneit;
 299                         }
 300                 }
 301                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 302                 vd.mantissa1 = ((unsigned int)id.mantissa1 >> 13);
 303                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 304                                 ((unsigned int)id.mantissa2 >> 29);
 305                 vd.mantissa3 = ((unsigned int)id.mantissa2 >> 13);
 306                 vd.mantissa4 = (id.mantissa2 << 3);
 307         doneit:
 308                 vd.sign = id.sign;
 309                 *dp = *((double *)(void *)&vd);
 310                 return (TRUE);
 311 #endif
 312
 313         case XDR_FREE:
 314                 return (TRUE);
 315         }
 316         /* NOTREACHED */
 317         return (FALSE);
 318 }