xdr_float.c revision 1.16
1 /* $NetBSD: xdr_float.c,v 1.16 1998/02/13 05:52:42 lukem Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 #if 0 35 static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC"; 37 #else 38 __RCSID("$NetBSD: xdr_float.c,v 1.16 1998/02/13 05:52:42 lukem Exp $"); 39 #endif 40 #endif 41 42 /* 43 * xdr_float.c, Generic XDR routines impelmentation. 44 * 45 * Copyright (C) 1984, Sun Microsystems, Inc. 46 * 47 * These are the "floating point" xdr routines used to (de)serialize 48 * most common data items. See xdr.h for more info on the interface to 49 * xdr. 50 */ 51 52 #include "namespace.h" 53 54 #include <sys/types.h> 55 #include <sys/param.h> 56 57 #include <stdio.h> 58 59 #include <rpc/types.h> 60 #include <rpc/xdr.h> 61 62 #ifdef __weak_alias 63 __weak_alias(xdr_double,_xdr_double); 64 __weak_alias(xdr_float,_xdr_float); 65 #endif 66 67 /* 68 * NB: Not portable. 69 * This routine works on machines with IEEE754 FP and Vaxen. 70 */ 71 72 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 73 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \ 74 defined(__arm32__) || defined(__powerpc__) 75 #include <machine/endian.h> 76 #define IEEEFP 77 #endif 78 79 #ifdef vax 80 81 /* What IEEE single precision floating point looks like on a Vax */ 82 struct ieee_single { 83 unsigned int mantissa: 23; 84 unsigned int exp : 8; 85 unsigned int sign : 1; 86 }; 87 88 /* Vax single precision floating point */ 89 struct vax_single { 90 unsigned int mantissa1 : 7; 91 unsigned int exp : 8; 92 unsigned int sign : 1; 93 unsigned int mantissa2 : 16; 94 }; 95 96 #define VAX_SNG_BIAS 0x81 97 #define IEEE_SNG_BIAS 0x7f 98 99 static struct sgl_limits { 100 struct vax_single s; 101 struct ieee_single ieee; 102 } sgl_limits[2] = { 103 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 104 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 105 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 106 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 107 }; 108 #endif /* vax */ 109 110 bool_t 111 xdr_float(xdrs, fp) 112 XDR *xdrs; 113 float *fp; 114 { 115 #ifdef IEEEFP 116 bool_t rv; 117 long tmpl; 118 #else 119 struct ieee_single is; 120 struct vax_single vs, *vsp; 121 struct sgl_limits *lim; 122 int i; 123 #endif 124 switch (xdrs->x_op) { 125 126 case XDR_ENCODE: 127 #ifdef IEEEFP 128 tmpl = *(int32_t *)fp; 129 return (XDR_PUTLONG(xdrs, &tmpl)); 130 #else 131 vs = *((struct vax_single *)fp); 132 for (i = 0, lim = sgl_limits; 133 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 134 i++, lim++) { 135 if ((vs.mantissa2 == lim->s.mantissa2) && 136 (vs.exp == lim->s.exp) && 137 (vs.mantissa1 == lim->s.mantissa1)) { 138 is = lim->ieee; 139 goto shipit; 140 } 141 } 142 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 143 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 144 shipit: 145 is.sign = vs.sign; 146 return (XDR_PUTLONG(xdrs, (long *)&is)); 147 #endif 148 149 case XDR_DECODE: 150 #ifdef IEEEFP 151 rv = XDR_GETLONG(xdrs, &tmpl); 152 *(int32_t *)fp = tmpl; 153 return (rv); 154 #else 155 vsp = (struct vax_single *)fp; 156 if (!XDR_GETLONG(xdrs, (long *)&is)) 157 return (FALSE); 158 for (i = 0, lim = sgl_limits; 159 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 160 i++, lim++) { 161 if ((is.exp == lim->ieee.exp) && 162 (is.mantissa == lim->ieee.mantissa)) { 163 *vsp = lim->s; 164 goto doneit; 165 } 166 } 167 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 168 vsp->mantissa2 = is.mantissa; 169 vsp->mantissa1 = (is.mantissa >> 16); 170 doneit: 171 vsp->sign = is.sign; 172 return (TRUE); 173 #endif 174 175 case XDR_FREE: 176 return (TRUE); 177 } 178 return (FALSE); 179 } 180 181 #ifdef vax 182 /* What IEEE double precision floating point looks like on a Vax */ 183 struct ieee_double { 184 unsigned int mantissa1 : 20; 185 unsigned int exp : 11; 186 unsigned int sign : 1; 187 unsigned int mantissa2 : 32; 188 }; 189 190 /* Vax double precision floating point */ 191 struct vax_double { 192 unsigned int mantissa1 : 7; 193 unsigned int exp : 8; 194 unsigned int sign : 1; 195 unsigned int mantissa2 : 16; 196 unsigned int mantissa3 : 16; 197 unsigned int mantissa4 : 16; 198 }; 199 200 #define VAX_DBL_BIAS 0x81 201 #define IEEE_DBL_BIAS 0x3ff 202 #define MASK(nbits) ((1 << nbits) - 1) 203 204 static struct dbl_limits { 205 struct vax_double d; 206 struct ieee_double ieee; 207 } dbl_limits[2] = { 208 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 209 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 210 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 211 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 212 }; 213 214 #endif /* vax */ 215 216 217 bool_t 218 xdr_double(xdrs, dp) 219 XDR *xdrs; 220 double *dp; 221 { 222 #ifdef IEEEFP 223 int32_t *i32p; 224 bool_t rv; 225 long tmpl; 226 #else 227 long *lp; 228 struct ieee_double id; 229 struct vax_double vd; 230 struct dbl_limits *lim; 231 int i; 232 #endif 233 234 switch (xdrs->x_op) { 235 236 case XDR_ENCODE: 237 #ifdef IEEEFP 238 i32p = (int32_t *)dp; 239 #if BYTE_ORDER == BIG_ENDIAN 240 tmpl = *i32p++; 241 rv = XDR_PUTLONG(xdrs, &tmpl); 242 if (!rv) 243 return (rv); 244 tmpl = *i32p; 245 rv = XDR_PUTLONG(xdrs, &tmpl); 246 #else 247 tmpl = *(i32p+1); 248 rv = XDR_PUTLONG(xdrs, &tmpl); 249 if (!rv) 250 return (rv); 251 tmpl = *i32p; 252 rv = XDR_PUTLONG(xdrs, &tmpl); 253 #endif 254 return (rv); 255 #else 256 vd = *((struct vax_double *)dp); 257 for (i = 0, lim = dbl_limits; 258 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 259 i++, lim++) { 260 if ((vd.mantissa4 == lim->d.mantissa4) && 261 (vd.mantissa3 == lim->d.mantissa3) && 262 (vd.mantissa2 == lim->d.mantissa2) && 263 (vd.mantissa1 == lim->d.mantissa1) && 264 (vd.exp == lim->d.exp)) { 265 id = lim->ieee; 266 goto shipit; 267 } 268 } 269 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 270 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 271 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 272 (vd.mantissa3 << 13) | 273 ((vd.mantissa4 >> 3) & MASK(13)); 274 shipit: 275 id.sign = vd.sign; 276 lp = (long *)&id; 277 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp)); 278 #endif 279 280 case XDR_DECODE: 281 #ifdef IEEEFP 282 i32p = (int32_t *)dp; 283 #if BYTE_ORDER == BIG_ENDIAN 284 rv = XDR_GETLONG(xdrs, &tmpl); 285 *i32p++ = tmpl; 286 if (!rv) 287 return (rv); 288 rv = XDR_GETLONG(xdrs, &tmpl); 289 *i32p = tmpl; 290 #else 291 rv = XDR_GETLONG(xdrs, &tmpl); 292 *(i32p+1) = tmpl; 293 if (!rv) 294 return (rv); 295 rv = XDR_GETLONG(xdrs, &tmpl); 296 *i32p = tmpl; 297 #endif 298 return (rv); 299 #else 300 lp = (long *)&id; 301 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp)) 302 return (FALSE); 303 for (i = 0, lim = dbl_limits; 304 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 305 i++, lim++) { 306 if ((id.mantissa2 == lim->ieee.mantissa2) && 307 (id.mantissa1 == lim->ieee.mantissa1) && 308 (id.exp == lim->ieee.exp)) { 309 vd = lim->d; 310 goto doneit; 311 } 312 } 313 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 314 vd.mantissa1 = (id.mantissa1 >> 13); 315 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 316 (id.mantissa2 >> 29); 317 vd.mantissa3 = (id.mantissa2 >> 13); 318 vd.mantissa4 = (id.mantissa2 << 3); 319 doneit: 320 vd.sign = id.sign; 321 *dp = *((double *)&vd); 322 return (TRUE); 323 #endif 324 325 case XDR_FREE: 326 return (TRUE); 327 } 328 return (FALSE); 329 } 330
Indexes created Mon Sep 22 13:09:51 GMT 2025