rpc.subproj/xdr_float.c

   1 /*
   2  * Copyright (c) 1999-2018 Apple 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 "libinfo_common.h"
  61
  62 #include <sys/cdefs.h>
  63
  64 /*
  65  * xdr_float.c, Generic XDR routines implementation.
  66  *
  67  * Copyright (C) 1984, Sun Microsystems, Inc.
  68  *
  69  * These are the "floating point" xdr routines used to (de)serialize
  70  * most common data items.  See xdr.h for more info on the interface to
  71  * xdr.
  72  */
  73
  74 #include <sys/types.h>
  75 #include <sys/param.h>
  76
  77 #include <stdio.h>
  78
  79 #include <rpc/types.h>
  80 #include <rpc/xdr.h>
  81
  82 /*
  83  * NB: Not portable.
  84  * This routine works on machines with IEEE754 FP and Vaxen.
  85  */
  86
  87 #if 1   /* Used to be long list of architectures */
  88 #include <machine/endian.h>
  89 #define IEEEFP
  90 #endif
  91
  92 #if defined(__vax__)
  93
  94 /* What IEEE single precision floating point looks like on a Vax */
  95 struct  ieee_single {
  96         unsigned int    mantissa: 23;
  97         unsigned int    exp     : 8;
  98         unsigned int    sign    : 1;
  99 };
 100
 101 /* Vax single precision floating point */
 102 struct  vax_single {
 103         unsigned int    mantissa1 : 7;
 104         unsigned int    exp       : 8;
 105         unsigned int    sign      : 1;
 106         unsigned int    mantissa2 : 16;
 107 };
 108
 109 #define VAX_SNG_BIAS    0x81
 110 #define IEEE_SNG_BIAS   0x7f
 111
 112 static struct sgl_limits {
 113         struct vax_single s;
 114         struct ieee_single ieee;
 115 } sgl_limits[2] = {
 116         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 117         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 118         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 119         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 120 };
 121 #endif /* vax */
 122
 123 LIBINFO_EXPORT
 124 bool_t
 125 xdr_float(xdrs, fp)
 126         XDR *xdrs;
 127         float *fp;
 128 {
 129 #ifndef IEEEFP
 130         struct ieee_single is;
 131         struct vax_single vs, *vsp;
 132         struct sgl_limits *lim;
 133         int i;
 134 #endif
 135         switch (xdrs->x_op) {
 136
 137         case XDR_ENCODE:
 138 #ifdef IEEEFP
 139                 return (XDR_PUTINT32(xdrs, (int32_t *)fp));
 140 #else
 141                 vs = *((struct vax_single *)fp);
 142                 for (i = 0, lim = sgl_limits;
 143                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 144                         i++, lim++) {
 145                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 146                                 (vs.exp == lim->s.exp) &&
 147                                 (vs.mantissa1 == lim->s.mantissa1)) {
 148                                 is = lim->ieee;
 149                                 goto shipit;
 150                         }
 151                 }
 152                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 153                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 154         shipit:
 155                 is.sign = vs.sign;
 156                 return (XDR_PUTINT32(xdrs, (int32_t *)&is));
 157 #endif
 158
 159         case XDR_DECODE:
 160 #ifdef IEEEFP
 161                 return (XDR_GETINT32(xdrs, (int32_t *)fp));
 162 #else
 163                 vsp = (struct vax_single *)fp;
 164                 if (!XDR_GETINT32(xdrs, (int32_t *)&is))
 165                         return (FALSE);
 166                 for (i = 0, lim = sgl_limits;
 167                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 168                         i++, lim++) {
 169                         if ((is.exp == lim->ieee.exp) &&
 170                                 (is.mantissa == lim->ieee.mantissa)) {
 171                                 *vsp = lim->s;
 172                                 goto doneit;
 173                         }
 174                 }
 175                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 176                 vsp->mantissa2 = is.mantissa;
 177                 vsp->mantissa1 = (is.mantissa >> 16);
 178         doneit:
 179                 vsp->sign = is.sign;
 180                 return (TRUE);
 181 #endif
 182
 183         case XDR_FREE:
 184                 return (TRUE);
 185         }
 186         /* NOTREACHED */
 187         return (FALSE);
 188 }
 189
 190 #if defined(__vax__)
 191 /* What IEEE double precision floating point looks like on a Vax */
 192 struct  ieee_double {
 193         unsigned int    mantissa1 : 20;
 194         unsigned int    exp       : 11;
 195         unsigned int    sign      : 1;
 196         unsigned int    mantissa2 : 32;
 197 };
 198
 199 /* Vax double precision floating point */
 200 struct  vax_double {
 201         unsigned int    mantissa1 : 7;
 202         unsigned int    exp       : 8;
 203         unsigned int    sign      : 1;
 204         unsigned int    mantissa2 : 16;
 205         unsigned int    mantissa3 : 16;
 206         unsigned int    mantissa4 : 16;
 207 };
 208
 209 #define VAX_DBL_BIAS    0x81
 210 #define IEEE_DBL_BIAS   0x3ff
 211 #define MASK(nbits)     ((1 << nbits) - 1)
 212
 213 static struct dbl_limits {
 214         struct  vax_double d;
 215         struct  ieee_double ieee;
 216 } dbl_limits[2] = {
 217         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 218         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 219         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 220         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 221 };
 222
 223 #endif /* vax */
 224
 225
 226 LIBINFO_EXPORT
 227 bool_t
 228 xdr_double(xdrs, dp)
 229         XDR *xdrs;
 230         double *dp;
 231 {
 232 #ifdef IEEEFP
 233         int32_t *i32p;
 234         bool_t rv;
 235 #else
 236         int32_t *lp;
 237         struct  ieee_double id;
 238         struct  vax_double vd;
 239         struct dbl_limits *lim;
 240         int i;
 241 #endif
 242
 243         switch (xdrs->x_op) {
 244
 245         case XDR_ENCODE:
 246 #ifdef IEEEFP
 247                 i32p = (int32_t *)(void *)dp;
 248 #if BYTE_ORDER == BIG_ENDIAN
 249                 rv = XDR_PUTINT32(xdrs, i32p);
 250                 if (!rv)
 251                         return (rv);
 252                 rv = XDR_PUTINT32(xdrs, i32p+1);
 253 #else
 254                 rv = XDR_PUTINT32(xdrs, i32p+1);
 255                 if (!rv)
 256                         return (rv);
 257                 rv = XDR_PUTINT32(xdrs, i32p);
 258 #endif
 259                 return (rv);
 260 #else
 261                 vd = *((struct vax_double *)dp);
 262                 for (i = 0, lim = dbl_limits;
 263                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 264                         i++, lim++) {
 265                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 266                                 (vd.mantissa3 == lim->d.mantissa3) &&
 267                                 (vd.mantissa2 == lim->d.mantissa2) &&
 268                                 (vd.mantissa1 == lim->d.mantissa1) &&
 269                                 (vd.exp == lim->d.exp)) {
 270                                 id = lim->ieee;
 271                                 goto shipit;
 272                         }
 273                 }
 274                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 275                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 276                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 277                                 (vd.mantissa3 << 13) |
 278                                 ((vd.mantissa4 >> 3) & MASK(13));
 279         shipit:
 280                 id.sign = vd.sign;
 281                 lp = (int32_t *)&id;
 282                 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
 283 #endif
 284
 285         case XDR_DECODE:
 286 #ifdef IEEEFP
 287                 i32p = (int32_t *)(void *)dp;
 288 #if BYTE_ORDER == BIG_ENDIAN
 289                 rv = XDR_GETINT32(xdrs, i32p);
 290                 if (!rv)
 291                         return (rv);
 292                 rv = XDR_GETINT32(xdrs, i32p+1);
 293 #else
 294                 rv = XDR_GETINT32(xdrs, i32p+1);
 295                 if (!rv)
 296                         return (rv);
 297                 rv = XDR_GETINT32(xdrs, i32p);
 298 #endif
 299                 return (rv);
 300 #else
 301                 lp = (int32_t *)&id;
 302                 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
 303                         return (FALSE);
 304                 for (i = 0, lim = dbl_limits;
 305                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 306                         i++, lim++) {
 307                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 308                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 309                                 (id.exp == lim->ieee.exp)) {
 310                                 vd = lim->d;
 311                                 goto doneit;
 312                         }
 313                 }
 314                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 315                 vd.mantissa1 = (id.mantissa1 >> 13);
 316                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 317                                 (id.mantissa2 >> 29);
 318                 vd.mantissa3 = (id.mantissa2 >> 13);
 319                 vd.mantissa4 = (id.mantissa2 << 3);
 320         doneit:
 321                 vd.sign = id.sign;
 322                 *dp = *((double *)&vd);
 323                 return (TRUE);
 324 #endif
 325
 326         case XDR_FREE:
 327                 return (TRUE);
 328         }
 329         /* NOTREACHED */
 330         return (FALSE);
 331 }