xdr_float.c

   1 /* @(#)xdr_float.c      2.1 88/07/29 4.0 RPCSRC */
   2 /*
   3  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   4  * unrestricted use provided that this legend is included on all tape
   5  * media and as a part of the software program in whole or part.  Users
   6  * may copy or modify Sun RPC without charge, but are not authorized
   7  * to license or distribute it to anyone else except as part of a product or
   8  * program developed by the user.
   9  *
  10  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  11  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  12  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  13  *
  14  * Sun RPC is provided with no support and without any obligation on the
  15  * part of Sun Microsystems, Inc. to assist in its use, correction,
  16  * modification or enhancement.
  17  *
  18  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  19  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  20  * OR ANY PART THEREOF.
  21  *
  22  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  23  * or profits or other special, indirect and consequential damages, even if
  24  * Sun has been advised of the possibility of such damages.
  25  *
  26  * Sun Microsystems, Inc.
  27  * 2550 Garcia Avenue
  28  * Mountain View, California  94043
  29  */
  30 #if 0
  31 static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
  32 #endif
  33
  34 /*
  35  * xdr_float.c, Generic XDR routines implementation.
  36  *
  37  * Copyright (C) 1984, Sun Microsystems, Inc.
  38  *
  39  * These are the "floating point" xdr routines used to (de)serialize
  40  * most common data items.  See xdr.h for more info on the interface to
  41  * xdr.
  42  */
  43
  44 #define __FORCE_GLIBC
  45 #include <features.h>
  46
  47 #include <stdio.h>
  48 #include <endian.h>
  49
  50 #include <rpc/types.h>
  51 #include <rpc/xdr.h>
  52
  53 /*
  54  * NB: Not portable.
  55  * This routine works on Suns (Sky / 68000's) and Vaxen.
  56  */
  57
  58 #define LSW     (__FLOAT_WORD_ORDER == __BIG_ENDIAN)
  59
  60 #ifdef vax
  61
  62 /* What IEEE single precision floating point looks like on a Vax */
  63 struct  ieee_single {
  64         unsigned int    mantissa: 23;
  65         unsigned int    exp     : 8;
  66         unsigned int    sign    : 1;
  67 };
  68
  69 /* Vax single precision floating point */
  70 struct  vax_single {
  71         unsigned int    mantissa1 : 7;
  72         unsigned int    exp       : 8;
  73         unsigned int    sign      : 1;
  74         unsigned int    mantissa2 : 16;
  75 };
  76
  77 #define VAX_SNG_BIAS    0x81
  78 #define IEEE_SNG_BIAS   0x7f
  79
  80 static struct sgl_limits {
  81         struct vax_single s;
  82         struct ieee_single ieee;
  83 } sgl_limits[2] = {
  84         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
  85         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
  86         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
  87         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
  88 };
  89 #endif /* vax */
  90
  91 bool_t
  92 xdr_float(XDR *xdrs, float *fp)
  93 {
  94 #ifdef vax
  95         struct ieee_single is;
  96         struct vax_single vs, *vsp;
  97         struct sgl_limits *lim;
  98         int i;
  99 #endif
 100         switch (xdrs->x_op) {
 101
 102         case XDR_ENCODE:
 103 #ifdef vax
 104                 vs = *((struct vax_single *)fp);
 105                 for (i = 0, lim = sgl_limits;
 106                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 107                         i++, lim++) {
 108                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 109                                 (vs.exp == lim->s.exp) &&
 110                                 (vs.mantissa1 == lim->s.mantissa1)) {
 111                                 is = lim->ieee;
 112                                 goto shipit;
 113                         }
 114                 }
 115                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 116                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 117         shipit:
 118                 is.sign = vs.sign;
 119                 return (XDR_PUTLONG(xdrs, (long *)&is));
 120 #else
 121                 if (sizeof(float) == sizeof(long))
 122                         return (XDR_PUTLONG(xdrs, (long *)fp));
 123                 else if (sizeof(float) == sizeof(int)) {
 124                         long tmp = *(int *)fp;
 125                         return (XDR_PUTLONG(xdrs, &tmp));
 126                 }
 127                 break;
 128 #endif
 129
 130         case XDR_DECODE:
 131 #ifdef vax
 132                 vsp = (struct vax_single *)fp;
 133                 if (!XDR_GETLONG(xdrs, (long *)&is))
 134                         return (FALSE);
 135                 for (i = 0, lim = sgl_limits;
 136                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 137                         i++, lim++) {
 138                         if ((is.exp == lim->ieee.exp) &&
 139                                 (is.mantissa == lim->ieee.mantissa)) {
 140                                 *vsp = lim->s;
 141                                 goto doneit;
 142                         }
 143                 }
 144                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 145                 vsp->mantissa2 = is.mantissa;
 146                 vsp->mantissa1 = (is.mantissa >> 16);
 147         doneit:
 148                 vsp->sign = is.sign;
 149                 return (TRUE);
 150 #else
 151                 if (sizeof(float) == sizeof(long))
 152                         return (XDR_GETLONG(xdrs, (long *)fp));
 153                 else if (sizeof(float) == sizeof(int)) {
 154                         long tmp;
 155                         if (XDR_GETLONG(xdrs, &tmp)) {
 156                                 *(int *)fp = tmp;
 157                                 return (TRUE);
 158                         }
 159                 }
 160                 break;
 161 #endif
 162
 163         case XDR_FREE:
 164                 return (TRUE);
 165         }
 166         return (FALSE);
 167 }
 168
 169 /*
 170  * This routine works on Suns (Sky / 68000's) and Vaxen.
 171  */
 172
 173 #ifdef vax
 174 /* What IEEE double precision floating point looks like on a Vax */
 175 struct  ieee_double {
 176         unsigned int    mantissa1 : 20;
 177         unsigned int    exp       : 11;
 178         unsigned int    sign      : 1;
 179         unsigned int    mantissa2 : 32;
 180 };
 181
 182 /* Vax double precision floating point */
 183 struct  vax_double {
 184         unsigned int    mantissa1 : 7;
 185         unsigned int    exp       : 8;
 186         unsigned int    sign      : 1;
 187         unsigned int    mantissa2 : 16;
 188         unsigned int    mantissa3 : 16;
 189         unsigned int    mantissa4 : 16;
 190 };
 191
 192 #define VAX_DBL_BIAS    0x81
 193 #define IEEE_DBL_BIAS   0x3ff
 194 #define MASK(nbits)     ((1 << nbits) - 1)
 195
 196 static struct dbl_limits {
 197         struct  vax_double d;
 198         struct  ieee_double ieee;
 199 } dbl_limits[2] = {
 200         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 201         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 202         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 203         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 204 };
 205
 206 #endif /* vax */
 207
 208
 209 bool_t
 210 xdr_double(XDR *xdrs, double *dp)
 211 {
 212 #ifdef vax
 213         struct  ieee_double id;
 214         struct  vax_double vd;
 215         register struct dbl_limits *lim;
 216         int i;
 217 #endif
 218
 219         switch (xdrs->x_op) {
 220
 221         case XDR_ENCODE:
 222 #ifdef vax
 223                 vd = *((struct vax_double *)dp);
 224                 for (i = 0, lim = dbl_limits;
 225                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 226                         i++, lim++) {
 227                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 228                                 (vd.mantissa3 == lim->d.mantissa3) &&
 229                                 (vd.mantissa2 == lim->d.mantissa2) &&
 230                                 (vd.mantissa1 == lim->d.mantissa1) &&
 231                                 (vd.exp == lim->d.exp)) {
 232                                 id = lim->ieee;
 233                                 goto shipit;
 234                         }
 235                 }
 236                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 237                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 238                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 239                                 (vd.mantissa3 << 13) |
 240                                 ((vd.mantissa4 >> 3) & MASK(13));
 241         shipit:
 242                 id.sign = vd.sign;
 243                 dp = (double *)&id;
 244 #endif
 245                 if (2*sizeof(long) == sizeof(double)) {
 246                         long *lp = (long *)dp;
 247                         return (XDR_PUTLONG(xdrs, lp+!LSW) &&
 248                                 XDR_PUTLONG(xdrs, lp+LSW));
 249                 } else if (2*sizeof(int) == sizeof(double)) {
 250                         int *ip = (int *)dp;
 251                         long tmp[2];
 252                         tmp[0] = ip[!LSW];
 253                         tmp[1] = ip[LSW];
 254                         return (XDR_PUTLONG(xdrs, tmp) &&
 255                                 XDR_PUTLONG(xdrs, tmp+1));
 256                 }
 257                 break;
 258
 259         case XDR_DECODE:
 260 #ifdef vax
 261                 lp = (long *)&id;
 262                 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
 263                         return (FALSE);
 264                 for (i = 0, lim = dbl_limits;
 265                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 266                         i++, lim++) {
 267                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 268                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 269                                 (id.exp == lim->ieee.exp)) {
 270                                 vd = lim->d;
 271                                 goto doneit;
 272                         }
 273                 }
 274                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 275                 vd.mantissa1 = (id.mantissa1 >> 13);
 276                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 277                                 (id.mantissa2 >> 29);
 278                 vd.mantissa3 = (id.mantissa2 >> 13);
 279                 vd.mantissa4 = (id.mantissa2 << 3);
 280         doneit:
 281                 vd.sign = id.sign;
 282                 *dp = *((double *)&vd);
 283                 return (TRUE);
 284 #else
 285                 if (2*sizeof(long) == sizeof(double)) {
 286                         long *lp = (long *)dp;
 287                         return (XDR_GETLONG(xdrs, lp+!LSW) &&
 288                                 XDR_GETLONG(xdrs, lp+LSW));
 289                 } else if (2*sizeof(int) == sizeof(double)) {
 290                         int *ip = (int *)dp;
 291                         long tmp[2];
 292                         if (XDR_GETLONG(xdrs, tmp+!LSW) &&
 293                             XDR_GETLONG(xdrs, tmp+LSW)) {
 294                                 ip[0] = tmp[0];
 295                                 ip[1] = tmp[1];
 296                                 return (TRUE);
 297                         }
 298                 }
 299                 break;
 300 #endif
 301
 302         case XDR_FREE:
 303                 return (TRUE);
 304         }
 305         return (FALSE);
 306 }