lib/libc/rpc/xdr_float.c

   1 /*      $NetBSD: xdr_float.c,v 1.35 2009/02/14 06:26:42 lukem Exp $     */
   2
   3 /*
   4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   5  * unrestricted use provided that this legend is included on all tape
   6  * media and as a part of the software program in whole or part.  Users
   7  * may copy or modify Sun RPC without charge, but are not authorized
   8  * to license or distribute it to anyone else except as part of a product or
   9  * program developed by the user.
  10  *
  11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  14  *
  15  * Sun RPC is provided with no support and without any obligation on the
  16  * part of Sun Microsystems, Inc. to assist in its use, correction,
  17  * modification or enhancement.
  18  *
  19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  21  * OR ANY PART THEREOF.
  22  *
  23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  24  * or profits or other special, indirect and consequential damages, even if
  25  * Sun has been advised of the possibility of such damages.
  26  *
  27  * Sun Microsystems, Inc.
  28  * 2550 Garcia Avenue
  29  * Mountain View, California  94043
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
  36 static char *sccsid = "@(#)xdr_float.c  2.1 88/07/29 4.0 RPCSRC";
  37 #else
  38 __RCSID("$NetBSD: xdr_float.c,v 1.35 2009/02/14 06:26:42 lukem Exp $");
  39 #endif
  40 #endif
  41
  42 /*
  43  * xdr_float.c, Generic XDR routines implementation.
  44  *
  45  * Copyright (C) 1984, Sun Microsystems, Inc.
  46  *
  47  * These are the "floating point" xdr routines used to (de)serialize
  48  * most common data items.  See xdr.h for more info on the interface to
  49  * xdr.
  50  */
  51
  52 #include "namespace.h"
  53
  54 #include <sys/types.h>
  55 #include <sys/param.h>
  56
  57 #include <stdio.h>
  58
  59 #include <rpc/types.h>
  60 #include <rpc/xdr.h>
  61
  62 #ifdef __weak_alias
  63 __weak_alias(xdr_double,_xdr_double)
  64 __weak_alias(xdr_float,_xdr_float)
  65 #endif
  66
  67 /*
  68  * NB: Not portable.
  69  * This routine works on machines with IEEE754 FP and Vaxen.
  70  */
  71
  72 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
  73     defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
  74     defined(__arm__) || defined(__powerpc__) || defined(__sh__) || \
  75     defined(__x86_64__) || defined(__hppa__) || defined(__ia64__)
  76 #include <machine/endian.h>
  77 #define IEEEFP
  78 #endif
  79
  80 #if defined(__vax__)
  81
  82 /* What IEEE single precision floating point looks like on a Vax */
  83 struct  ieee_single {
  84         unsigned int    mantissa: 23;
  85         unsigned int    exp     : 8;
  86         unsigned int    sign    : 1;
  87 };
  88
  89 /* Vax single precision floating point */
  90 struct  vax_single {
  91         unsigned int    mantissa1 : 7;
  92         unsigned int    exp       : 8;
  93         unsigned int    sign      : 1;
  94         unsigned int    mantissa2 : 16;
  95 };
  96
  97 #define VAX_SNG_BIAS    0x81
  98 #define IEEE_SNG_BIAS   0x7f
  99
 100 static struct sgl_limits {
 101         struct vax_single s;
 102         struct ieee_single ieee;
 103 } sgl_limits[2] = {
 104         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 105         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 106         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 107         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 108 };
 109 #endif /* vax */
 110
 111 bool_t
 112 xdr_float(xdrs, fp)
 113         XDR *xdrs;
 114         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 *)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 *)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 = (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(xdrs, dp)
 215         XDR *xdrs;
 216         double *dp;
 217 {
 218 #ifdef IEEEFP
 219         int32_t *i32p;
 220         bool_t rv;
 221 #else
 222         int32_t *lp;
 223         struct  ieee_double id;
 224         struct  vax_double vd;
 225         struct dbl_limits *lim;
 226         size_t i;
 227 #endif
 228
 229         switch (xdrs->x_op) {
 230
 231         case XDR_ENCODE:
 232 #ifdef IEEEFP
 233                 i32p = (int32_t *)(void *)dp;
 234 #if (BYTE_ORDER == BIG_ENDIAN) || \
 235     (defined(__arm__) && !defined(__VFP_FP__))
 236                 rv = XDR_PUTINT32(xdrs, i32p);
 237                 if (!rv)
 238                         return (rv);
 239                 rv = XDR_PUTINT32(xdrs, i32p+1);
 240 #else
 241                 rv = XDR_PUTINT32(xdrs, i32p+1);
 242                 if (!rv)
 243                         return (rv);
 244                 rv = XDR_PUTINT32(xdrs, i32p);
 245 #endif
 246                 return (rv);
 247 #else
 248                 vd = *((struct vax_double *)dp);
 249                 for (i = 0, lim = dbl_limits;
 250                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 251                         i++, lim++) {
 252                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 253                                 (vd.mantissa3 == lim->d.mantissa3) &&
 254                                 (vd.mantissa2 == lim->d.mantissa2) &&
 255                                 (vd.mantissa1 == lim->d.mantissa1) &&
 256                                 (vd.exp == lim->d.exp)) {
 257                                 id = lim->ieee;
 258                                 goto shipit;
 259                         }
 260                 }
 261                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 262                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 263                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 264                                 (vd.mantissa3 << 13) |
 265                                 ((vd.mantissa4 >> 3) & MASK(13));
 266         shipit:
 267                 id.sign = vd.sign;
 268                 lp = (int32_t *)(void *)&id;
 269                 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
 270 #endif
 271
 272         case XDR_DECODE:
 273 #ifdef IEEEFP
 274                 i32p = (int32_t *)(void *)dp;
 275 #if BYTE_ORDER == BIG_ENDIAN || \
 276     (defined(__arm__) && !defined(__VFP_FP__))
 277                 rv = XDR_GETINT32(xdrs, i32p);
 278                 if (!rv)
 279                         return (rv);
 280                 rv = XDR_GETINT32(xdrs, i32p+1);
 281 #else
 282                 rv = XDR_GETINT32(xdrs, i32p+1);
 283                 if (!rv)
 284                         return (rv);
 285                 rv = XDR_GETINT32(xdrs, i32p);
 286 #endif
 287                 return (rv);
 288 #else
 289                 lp = (int32_t *)(void *)&id;
 290                 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
 291                         return (FALSE);
 292                 for (i = 0, lim = dbl_limits;
 293                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 294                         i++, lim++) {
 295                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 296                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 297                                 (id.exp == lim->ieee.exp)) {
 298                                 vd = lim->d;
 299                                 goto doneit;
 300                         }
 301                 }
 302                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 303                 vd.mantissa1 = (id.mantissa1 >> 13);
 304                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 305                                 (id.mantissa2 >> 29);
 306                 vd.mantissa3 = (id.mantissa2 >> 13);
 307                 vd.mantissa4 = (id.mantissa2 << 3);
 308         doneit:
 309                 vd.sign = id.sign;
 310                 *dp = *((double *)(void *)&vd);
 311                 return (TRUE);
 312 #endif
 313
 314         case XDR_FREE:
 315                 return (TRUE);
 316         }
 317         /* NOTREACHED */
 318         return (FALSE);
 319 }