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  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
  26  * unrestricted use provided that this legend is included on all tape
  27  * media and as a part of the software program in whole or part.  Users
  28  * may copy or modify Sun RPC without charge, but are not authorized
  29  * to license or distribute it to anyone else except as part of a product or
  30  * program developed by the user.
  31  *
  32  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  33  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  34  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  35  *
  36  * Sun RPC is provided with no support and without any obligation on the
  37  * part of Sun Microsystems, Inc. to assist in its use, correction,
  38  * modification or enhancement.
  39  *
  40  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  41  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  42  * OR ANY PART THEREOF.
  43  *
  44  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  45  * or profits or other special, indirect and consequential damages, even if
  46  * Sun has been advised of the possibility of such damages.
  47  *
  48  * Sun Microsystems, Inc.
  49  * 2550 Garcia Avenue
  50  * Mountain View, California  94043
  51  */
  52
  53 #if defined(LIBC_SCCS) && !defined(lint)
  54 /*static char *sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/
  55 /*static char *sccsid = "from: @(#)xdr_float.c  2.1 88/07/29 4.0 RPCSRC";*/
  56 static char *rcsid = "$Id: xdr_float.c,v 1.2 1999/10/14 21:56:55 wsanchez Exp $";
  57 #endif
  58
  59 /*
  60  * xdr_float.c, Generic XDR routines impelmentation.
  61  *
  62  * Copyright (C) 1984, Sun Microsystems, Inc.
  63  *
  64  * These are the "floating point" xdr routines used to (de)serialize
  65  * most common data items.  See xdr.h for more info on the interface to
  66  * xdr.
  67  */
  68
  69 #include <stdio.h>
  70 #include <sys/types.h>
  71 #include <sys/param.h>
  72 #include <rpc/types.h>
  73 #include <rpc/xdr.h>
  74
  75 /*
  76  * NB: Not portable.
  77  * This routine works on Suns (Sky / 68000's), i386's, MIPS, NS32k and Vaxen.
  78  */
  79
  80 #if defined(mc68000)||defined(sparc)||defined(i386)||defined(mips)||defined(ns32k)||defined(__APPLE__)
  81 #define IEEEFP
  82 #endif
  83
  84 #ifdef vax
  85
  86 /* What IEEE single precision floating point looks like on a Vax */
  87 struct  ieee_single {
  88         unsigned int    mantissa: 23;
  89         unsigned int    exp     : 8;
  90         unsigned int    sign    : 1;
  91 };
  92
  93 /* Vax single precision floating point */
  94 struct  vax_single {
  95         unsigned int    mantissa1 : 7;
  96         unsigned int    exp       : 8;
  97         unsigned int    sign      : 1;
  98         unsigned int    mantissa2 : 16;
  99 };
 100
 101 #define VAX_SNG_BIAS    0x81
 102 #define IEEE_SNG_BIAS   0x7f
 103
 104 static struct sgl_limits {
 105         struct vax_single s;
 106         struct ieee_single ieee;
 107 } sgl_limits[2] = {
 108         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
 109         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
 110         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
 111         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
 112 };
 113 #endif /* vax */
 114
 115 bool_t
 116 xdr_float(xdrs, fp)
 117         register XDR *xdrs;
 118         register float *fp;
 119 {
 120 #ifndef IEEEFP
 121         struct ieee_single is;
 122         struct vax_single vs, *vsp;
 123         struct sgl_limits *lim;
 124         int i;
 125 #endif
 126         switch (xdrs->x_op) {
 127
 128         case XDR_ENCODE:
 129 #ifdef IEEEFP
 130                 return (XDR_PUTLONG(xdrs, (long *)fp));
 131 #else
 132                 vs = *((struct vax_single *)fp);
 133                 for (i = 0, lim = sgl_limits;
 134                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 135                         i++, lim++) {
 136                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 137                                 (vs.exp == lim->s.exp) &&
 138                                 (vs.mantissa1 == lim->s.mantissa1)) {
 139                                 is = lim->ieee;
 140                                 goto shipit;
 141                         }
 142                 }
 143                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 144                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 145         shipit:
 146                 is.sign = vs.sign;
 147                 return (XDR_PUTLONG(xdrs, (long *)&is));
 148 #endif
 149
 150         case XDR_DECODE:
 151 #ifdef IEEEFP
 152                 return (XDR_GETLONG(xdrs, (long *)fp));
 153 #else
 154                 vsp = (struct vax_single *)fp;
 155                 if (!XDR_GETLONG(xdrs, (long *)&is))
 156                         return (FALSE);
 157                 for (i = 0, lim = sgl_limits;
 158                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 159                         i++, lim++) {
 160                         if ((is.exp == lim->ieee.exp) &&
 161                                 (is.mantissa == lim->ieee.mantissa)) {
 162                                 *vsp = lim->s;
 163                                 goto doneit;
 164                         }
 165                 }
 166                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 167                 vsp->mantissa2 = is.mantissa;
 168                 vsp->mantissa1 = (is.mantissa >> 16);
 169         doneit:
 170                 vsp->sign = is.sign;
 171                 return (TRUE);
 172 #endif
 173
 174         case XDR_FREE:
 175                 return (TRUE);
 176         }
 177         return (FALSE);
 178 }
 179
 180 /*
 181  * This routine works on Suns (Sky / 68000's), i386's, MIPS and Vaxen.
 182  */
 183
 184 #ifdef vax
 185 /* What IEEE double precision floating point looks like on a Vax */
 186 struct  ieee_double {
 187         unsigned int    mantissa1 : 20;
 188         unsigned int    exp       : 11;
 189         unsigned int    sign      : 1;
 190         unsigned int    mantissa2 : 32;
 191 };
 192
 193 /* Vax double precision floating point */
 194 struct  vax_double {
 195         unsigned int    mantissa1 : 7;
 196         unsigned int    exp       : 8;
 197         unsigned int    sign      : 1;
 198         unsigned int    mantissa2 : 16;
 199         unsigned int    mantissa3 : 16;
 200         unsigned int    mantissa4 : 16;
 201 };
 202
 203 #define VAX_DBL_BIAS    0x81
 204 #define IEEE_DBL_BIAS   0x3ff
 205 #define MASK(nbits)     ((1 << nbits) - 1)
 206
 207 static struct dbl_limits {
 208         struct  vax_double d;
 209         struct  ieee_double ieee;
 210 } dbl_limits[2] = {
 211         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 212         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 213         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 214         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 215 };
 216
 217 #endif /* vax */
 218
 219
 220 bool_t
 221 xdr_double(xdrs, dp)
 222         register XDR *xdrs;
 223         double *dp;
 224 {
 225         register long *lp;
 226 #ifndef IEEEFP
 227         struct  ieee_double id;
 228         struct  vax_double vd;
 229         register struct dbl_limits *lim;
 230         int i;
 231 #endif
 232
 233         switch (xdrs->x_op) {
 234
 235         case XDR_ENCODE:
 236 #ifdef IEEEFP
 237                 lp = (long *)dp;
 238 #if BYTE_ORDER == BIG_ENDIAN
 239                 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
 240 #else
 241                 return (XDR_PUTLONG(xdrs, lp+1) && XDR_PUTLONG(xdrs, lp));
 242 #endif
 243 #else
 244                 vd = *((struct vax_double *)dp);
 245                 for (i = 0, lim = dbl_limits;
 246                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 247                         i++, lim++) {
 248                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 249                                 (vd.mantissa3 == lim->d.mantissa3) &&
 250                                 (vd.mantissa2 == lim->d.mantissa2) &&
 251                                 (vd.mantissa1 == lim->d.mantissa1) &&
 252                                 (vd.exp == lim->d.exp)) {
 253                                 id = lim->ieee;
 254                                 goto shipit;
 255                         }
 256                 }
 257                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 258                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 259                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 260                                 (vd.mantissa3 << 13) |
 261                                 ((vd.mantissa4 >> 3) & MASK(13));
 262         shipit:
 263                 id.sign = vd.sign;
 264                 lp = (long *)&id;
 265                 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
 266 #endif
 267
 268         case XDR_DECODE:
 269 #ifdef IEEEFP
 270                 lp = (long *)dp;
 271 #if BYTE_ORDER == BIG_ENDIAN
 272                 return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
 273 #else
 274                 return (XDR_GETLONG(xdrs, lp+1) && XDR_GETLONG(xdrs, lp));
 275 #endif
 276 #else
 277                 lp = (long *)&id;
 278                 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
 279                         return (FALSE);
 280                 for (i = 0, lim = dbl_limits;
 281                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 282                         i++, lim++) {
 283                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 284                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 285                                 (id.exp == lim->ieee.exp)) {
 286                                 vd = lim->d;
 287                                 goto doneit;
 288                         }
 289                 }
 290                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 291                 vd.mantissa1 = (id.mantissa1 >> 13);
 292                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 293                                 (id.mantissa2 >> 29);
 294                 vd.mantissa3 = (id.mantissa2 >> 13);
 295                 vd.mantissa4 = (id.mantissa2 << 3);
 296         doneit:
 297                 vd.sign = id.sign;
 298                 *dp = *((double *)&vd);
 299                 return (TRUE);
 300 #endif
 301
 302         case XDR_FREE:
 303                 return (TRUE);
 304         }
 305         return (FALSE);
 306 }