rpc.subproj/xdr_float.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 /*      $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $      */
  26
  27 /*
  28  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  29  * unrestricted use provided that this legend is included on all tape
  30  * media and as a part of the software program in whole or part.  Users
  31  * may copy or modify Sun RPC without charge, but are not authorized
  32  * to license or distribute it to anyone else except as part of a product or
  33  * program developed by the user.
  34  *
  35  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  36  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  37  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  38  *
  39  * Sun RPC is provided with no support and without any obligation on the
  40  * part of Sun Microsystems, Inc. to assist in its use, correction,
  41  * modification or enhancement.
  42  *
  43  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  44  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  45  * OR ANY PART THEREOF.
  46  *
  47  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  48  * or profits or other special, indirect and consequential damages, even if
  49  * Sun has been advised of the possibility of such damages.
  50  *
  51  * Sun Microsystems, Inc.
  52  * 2550 Garcia Avenue
  53  * Mountain View, California  94043
  54  */
  55
  56 #if defined(LIBC_SCCS) && !defined(lint)
  57 static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
  58 static char *sccsid = "@(#)xdr_float.c  2.1 88/07/29 4.0 RPCSRC";
  59 #endif
  60 #include <sys/cdefs.h>
  61
  62 /*
  63  * xdr_float.c, Generic XDR routines implementation.
  64  *
  65  * Copyright (C) 1984, Sun Microsystems, Inc.
  66  *
  67  * These are the "floating point" xdr routines used to (de)serialize
  68  * most common data items.  See xdr.h for more info on the interface to
  69  * xdr.
  70  */
  71
  72 #include <sys/types.h>
  73 #include <sys/param.h>
  74
  75 #include <stdio.h>
  76
  77 #include <rpc/types.h>
  78 #include <rpc/xdr.h>
  79
  80 /*
  81  * NB: Not portable.
  82  * This routine works on machines with IEEE754 FP and Vaxen.
  83  */
  84
  85 #if 1   /* Used to be long list of architectures */
  86 #include <machine/endian.h>
  87 #define IEEEFP
  88 #endif
  89
  90 #if defined(__vax__)
  91
  92 /* What IEEE single precision floating point looks like on a Vax */
  93 struct  ieee_single {
  94         unsigned int    mantissa: 23;
  95         unsigned int    exp     : 8;
  96         unsigned int    sign    : 1;
  97 };
  98
  99 /* Vax single precision floating point */
 100 struct  vax_single {
 101         unsigned int    mantissa1 : 7;
 102         unsigned int    exp       : 8;
 103         unsigned int    sign      : 1;
 104         unsigned int    mantissa2 : 16;
 105 };
 106
 107 #define VAX_SNG_BIAS    0x81
 108 #define IEEE_SNG_BIAS   0x7f
 109
 110 static struct sgl_limits {
 111         struct vax_single s;
 112         struct ieee_single ieee;
 113 } sgl_limits[2] = {
 114         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 115         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 116         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 117         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 118 };
 119 #endif /* vax */
 120
 121 bool_t
 122 xdr_float(xdrs, fp)
 123         XDR *xdrs;
 124         float *fp;
 125 {
 126 #ifndef IEEEFP
 127         struct ieee_single is;
 128         struct vax_single vs, *vsp;
 129         struct sgl_limits *lim;
 130         int i;
 131 #endif
 132         switch (xdrs->x_op) {
 133
 134         case XDR_ENCODE:
 135 #ifdef IEEEFP
 136                 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
 137 #else
 138                 vs = *((struct vax_single *)fp);
 139                 for (i = 0, lim = sgl_limits;
 140                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 141                         i++, lim++) {
 142                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 143                                 (vs.exp == lim->s.exp) &&
 144                                 (vs.mantissa1 == lim->s.mantissa1)) {
 145                                 is = lim->ieee;
 146                                 goto shipit;
 147                         }
 148                 }
 149                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 150                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 151         shipit:
 152                 is.sign = vs.sign;
 153                 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
 154 #endif
 155
 156         case XDR_DECODE:
 157 #ifdef IEEEFP
 158                 return (XDR_GETINT32(xdrs, (int32_t *)fp));
 159 #else
 160                 vsp = (struct vax_single *)fp;
 161                 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
 162                         return (FALSE);
 163                 for (i = 0, lim = sgl_limits;
 164                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 165                         i++, lim++) {
 166                         if ((is.exp == lim->ieee.exp) &&
 167                                 (is.mantissa == lim->ieee.mantissa)) {
 168                                 *vsp = lim->s;
 169                                 goto doneit;
 170                         }
 171                 }
 172                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 173                 vsp->mantissa2 = is.mantissa;
 174                 vsp->mantissa1 = (is.mantissa >> 16);
 175         doneit:
 176                 vsp->sign = is.sign;
 177                 return (TRUE);
 178 #endif
 179
 180         case XDR_FREE:
 181                 return (TRUE);
 182         }
 183         /* NOTREACHED */
 184         return (FALSE);
 185 }
 186
 187 #if defined(__vax__)
 188 /* What IEEE double precision floating point looks like on a Vax */
 189 struct  ieee_double {
 190         unsigned int    mantissa1 : 20;
 191         unsigned int    exp       : 11;
 192         unsigned int    sign      : 1;
 193         unsigned int    mantissa2 : 32;
 194 };
 195
 196 /* Vax double precision floating point */
 197 struct  vax_double {
 198         unsigned int    mantissa1 : 7;
 199         unsigned int    exp       : 8;
 200         unsigned int    sign      : 1;
 201         unsigned int    mantissa2 : 16;
 202         unsigned int    mantissa3 : 16;
 203         unsigned int    mantissa4 : 16;
 204 };
 205
 206 #define VAX_DBL_BIAS    0x81
 207 #define IEEE_DBL_BIAS   0x3ff
 208 #define MASK(nbits)     ((1 << nbits) - 1)
 209
 210 static struct dbl_limits {
 211         struct  vax_double d;
 212         struct  ieee_double ieee;
 213 } dbl_limits[2] = {
 214         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 215         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 216         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 217         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 218 };
 219
 220 #endif /* vax */
 221
 222
 223 bool_t
 224 xdr_double(xdrs, dp)
 225         XDR *xdrs;
 226         double *dp;
 227 {
 228 #ifdef IEEEFP
 229         int32_t *i32p;
 230         bool_t rv;
 231 #else
 232         int32_t *lp;
 233         struct  ieee_double id;
 234         struct  vax_double vd;
 235         struct dbl_limits *lim;
 236         int i;
 237 #endif
 238
 239         switch (xdrs->x_op) {
 240
 241         case XDR_ENCODE:
 242 #ifdef IEEEFP
 243                 i32p = (int32_t *)(void *)dp;
 244 #if BYTE_ORDER == BIG_ENDIAN
 245                 rv = XDR_PUTINT32(xdrs, i32p);
 246                 if (!rv)
 247                         return (rv);
 248                 rv = XDR_PUTINT32(xdrs, i32p+1);
 249 #else
 250                 rv = XDR_PUTINT32(xdrs, i32p+1);
 251                 if (!rv)
 252                         return (rv);
 253                 rv = XDR_PUTINT32(xdrs, i32p);
 254 #endif
 255                 return (rv);
 256 #else
 257                 vd = *((struct vax_double *)dp);
 258                 for (i = 0, lim = dbl_limits;
 259                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 260                         i++, lim++) {
 261                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 262                                 (vd.mantissa3 == lim->d.mantissa3) &&
 263                                 (vd.mantissa2 == lim->d.mantissa2) &&
 264                                 (vd.mantissa1 == lim->d.mantissa1) &&
 265                                 (vd.exp == lim->d.exp)) {
 266                                 id = lim->ieee;
 267                                 goto shipit;
 268                         }
 269                 }
 270                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 271                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 272                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 273                                 (vd.mantissa3 << 13) |
 274                                 ((vd.mantissa4 >> 3) & MASK(13));
 275         shipit:
 276                 id.sign = vd.sign;
 277                 lp = (int32_t *)&id;
 278                 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
 279 #endif
 280
 281         case XDR_DECODE:
 282 #ifdef IEEEFP
 283                 i32p = (int32_t *)(void *)dp;
 284 #if BYTE_ORDER == BIG_ENDIAN
 285                 rv = XDR_GETINT32(xdrs, i32p);
 286                 if (!rv)
 287                         return (rv);
 288                 rv = XDR_GETINT32(xdrs, i32p+1);
 289 #else
 290                 rv = XDR_GETINT32(xdrs, i32p+1);
 291                 if (!rv)
 292                         return (rv);
 293                 rv = XDR_GETINT32(xdrs, i32p);
 294 #endif
 295                 return (rv);
 296 #else
 297                 lp = (int32_t *)&id;
 298                 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
 299                         return (FALSE);
 300                 for (i = 0, lim = dbl_limits;
 301                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 302                         i++, lim++) {
 303                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 304                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 305                                 (id.exp == lim->ieee.exp)) {
 306                                 vd = lim->d;
 307                                 goto doneit;
 308                         }
 309                 }
 310                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 311                 vd.mantissa1 = (id.mantissa1 >> 13);
 312                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 313                                 (id.mantissa2 >> 29);
 314                 vd.mantissa3 = (id.mantissa2 >> 13);
 315                 vd.mantissa4 = (id.mantissa2 << 3);
 316         doneit:
 317                 vd.sign = id.sign;
 318                 *dp = *((double *)&vd);
 319                 return (TRUE);
 320 #endif
 321
 322         case XDR_FREE:
 323                 return (TRUE);
 324         }
 325         /* NOTREACHED */
 326         return (FALSE);
 327 }