sunrpc/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 !defined(lint) && defined(SCCSIDS)
  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 impelmentation.
  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 #include <stdio.h>
  45
  46 #include <rpc/types.h>
  47 #include <rpc/xdr.h>
  48
  49 /*
  50  * NB: Not portable.
  51  * This routine works on Suns (Sky / 68000's) and Vaxen.
  52  */
  53
  54 #ifdef vax
  55
  56 /* What IEEE single precision floating point looks like on a Vax */
  57 struct  ieee_single {
  58         unsigned int    mantissa: 23;
  59         unsigned int    exp     : 8;
  60         unsigned int    sign    : 1;
  61 };
  62
  63 /* Vax single precision floating point */
  64 struct  vax_single {
  65         unsigned int    mantissa1 : 7;
  66         unsigned int    exp       : 8;
  67         unsigned int    sign      : 1;
  68         unsigned int    mantissa2 : 16;
  69 };
  70
  71 #define VAX_SNG_BIAS    0x81
  72 #define IEEE_SNG_BIAS   0x7f
  73
  74 static struct sgl_limits {
  75         struct vax_single s;
  76         struct ieee_single ieee;
  77 } sgl_limits[2] = {
  78         {{ 0x7f, 0xff, 0x0, 0xffff },   /* Max Vax */
  79         { 0x0, 0xff, 0x0 }},            /* Max IEEE */
  80         {{ 0x0, 0x0, 0x0, 0x0 },        /* Min Vax */
  81         { 0x0, 0x0, 0x0 }}              /* Min IEEE */
  82 };
  83 #endif /* vax */
  84
  85 bool_t
  86 xdr_float(xdrs, fp)
  87         register XDR *xdrs;
  88         register float *fp;
  89 {
  90 #ifdef vax
  91         struct ieee_single is;
  92         struct vax_single vs, *vsp;
  93         struct sgl_limits *lim;
  94         int i;
  95 #endif
  96         switch (xdrs->x_op) {
  97
  98         case XDR_ENCODE:
  99 #ifndef vax
 100                 return (XDR_PUTLONG(xdrs, (long *)fp));
 101 #else
 102                 vs = *((struct vax_single *)fp);
 103                 for (i = 0, lim = sgl_limits;
 104                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 105                         i++, lim++) {
 106                         if ((vs.mantissa2 == lim->s.mantissa2) &&
 107                                 (vs.exp == lim->s.exp) &&
 108                                 (vs.mantissa1 == lim->s.mantissa1)) {
 109                                 is = lim->ieee;
 110                                 goto shipit;
 111                         }
 112                 }
 113                 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
 114                 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
 115         shipit:
 116                 is.sign = vs.sign;
 117                 return (XDR_PUTLONG(xdrs, (long *)&is));
 118 #endif
 119
 120         case XDR_DECODE:
 121 #ifndef vax
 122                 return (XDR_GETLONG(xdrs, (long *)fp));
 123 #else
 124                 vsp = (struct vax_single *)fp;
 125                 if (!XDR_GETLONG(xdrs, (long *)&is))
 126                         return (FALSE);
 127                 for (i = 0, lim = sgl_limits;
 128                         i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
 129                         i++, lim++) {
 130                         if ((is.exp == lim->ieee.exp) &&
 131                                 (is.mantissa == lim->ieee.mantissa)) {
 132                                 *vsp = lim->s;
 133                                 goto doneit;
 134                         }
 135                 }
 136                 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
 137                 vsp->mantissa2 = is.mantissa;
 138                 vsp->mantissa1 = (is.mantissa >> 16);
 139         doneit:
 140                 vsp->sign = is.sign;
 141                 return (TRUE);
 142 #endif
 143
 144         case XDR_FREE:
 145                 return (TRUE);
 146         }
 147         return (FALSE);
 148 }
 149
 150 /*
 151  * This routine works on Suns (Sky / 68000's) and Vaxen.
 152  */
 153
 154 #ifdef vax
 155 /* What IEEE double precision floating point looks like on a Vax */
 156 struct  ieee_double {
 157         unsigned int    mantissa1 : 20;
 158         unsigned int    exp       : 11;
 159         unsigned int    sign      : 1;
 160         unsigned int    mantissa2 : 32;
 161 };
 162
 163 /* Vax double precision floating point */
 164 struct  vax_double {
 165         unsigned int    mantissa1 : 7;
 166         unsigned int    exp       : 8;
 167         unsigned int    sign      : 1;
 168         unsigned int    mantissa2 : 16;
 169         unsigned int    mantissa3 : 16;
 170         unsigned int    mantissa4 : 16;
 171 };
 172
 173 #define VAX_DBL_BIAS    0x81
 174 #define IEEE_DBL_BIAS   0x3ff
 175 #define MASK(nbits)     ((1 << nbits) - 1)
 176
 177 static struct dbl_limits {
 178         struct  vax_double d;
 179         struct  ieee_double ieee;
 180 } dbl_limits[2] = {
 181         {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },   /* Max Vax */
 182         { 0x0, 0x7ff, 0x0, 0x0 }},                      /* Max IEEE */
 183         {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},               /* Min Vax */
 184         { 0x0, 0x0, 0x0, 0x0 }}                         /* Min IEEE */
 185 };
 186
 187 #endif /* vax */
 188
 189
 190 bool_t
 191 xdr_double(xdrs, dp)
 192         register XDR *xdrs;
 193         double *dp;
 194 {
 195         register long *lp;
 196 #ifdef vax
 197         struct  ieee_double id;
 198         struct  vax_double vd;
 199         register struct dbl_limits *lim;
 200         int i;
 201 #endif
 202
 203         switch (xdrs->x_op) {
 204
 205         case XDR_ENCODE:
 206 #ifndef vax
 207                 lp = (long *)dp;
 208 #else
 209                 vd = *((struct vax_double *)dp);
 210                 for (i = 0, lim = dbl_limits;
 211                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 212                         i++, lim++) {
 213                         if ((vd.mantissa4 == lim->d.mantissa4) &&
 214                                 (vd.mantissa3 == lim->d.mantissa3) &&
 215                                 (vd.mantissa2 == lim->d.mantissa2) &&
 216                                 (vd.mantissa1 == lim->d.mantissa1) &&
 217                                 (vd.exp == lim->d.exp)) {
 218                                 id = lim->ieee;
 219                                 goto shipit;
 220                         }
 221                 }
 222                 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
 223                 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
 224                 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
 225                                 (vd.mantissa3 << 13) |
 226                                 ((vd.mantissa4 >> 3) & MASK(13));
 227         shipit:
 228                 id.sign = vd.sign;
 229                 lp = (long *)&id;
 230 #endif
 231                 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
 232
 233         case XDR_DECODE:
 234 #ifndef vax
 235                 lp = (long *)dp;
 236                 return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
 237 #else
 238                 lp = (long *)&id;
 239                 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
 240                         return (FALSE);
 241                 for (i = 0, lim = dbl_limits;
 242                         i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
 243                         i++, lim++) {
 244                         if ((id.mantissa2 == lim->ieee.mantissa2) &&
 245                                 (id.mantissa1 == lim->ieee.mantissa1) &&
 246                                 (id.exp == lim->ieee.exp)) {
 247                                 vd = lim->d;
 248                                 goto doneit;
 249                         }
 250                 }
 251                 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
 252                 vd.mantissa1 = (id.mantissa1 >> 13);
 253                 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
 254                                 (id.mantissa2 >> 29);
 255                 vd.mantissa3 = (id.mantissa2 >> 13);
 256                 vd.mantissa4 = (id.mantissa2 << 3);
 257         doneit:
 258                 vd.sign = id.sign;
 259                 *dp = *((double *)&vd);
 260                 return (TRUE);
 261 #endif
 262
 263         case XDR_FREE:
 264                 return (TRUE);
 265         }
 266         return (FALSE);
 267 }