xdr_float.c revision 1.21
1 /* $NetBSD: xdr_float.c,v 1.21 2000/05/09 21:55:52 bjh21 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 1.21 2000/05/09 21:55:52 bjh21 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__) || defined(__sh3__) || \ 75 defined(__arm26__) 76 #include <machine/endian.h> 77 #define IEEEFP 78 #endif 79 80 #if defined(__vax__) 81 82 /* What IEEE single precision floating point looks like on a Vax */ 83 struct ieee_single { 84 unsigned int mantissa: 23; 85 unsigned int exp : 8; 86 unsigned int sign : 1; 87 }; 88 89 /* Vax single precision floating point */ 90 struct vax_single { 91 unsigned int mantissa1 : 7; 92 unsigned int exp : 8; 93 unsigned int sign : 1; 94 unsigned int mantissa2 : 16; 95 }; 96 97 #define VAX_SNG_BIAS 0x81 98 #define IEEE_SNG_BIAS 0x7f 99 100 static struct sgl_limits { 101 struct vax_single s; 102 struct ieee_single ieee; 103 } sgl_limits[2] = { 104 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 105 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 106 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 107 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 108 }; 109 #endif /* vax */ 110 111 bool_t 112 xdr_float(xdrs, fp) 113 XDR *xdrs; 114 float *fp; 115 { 116 #ifdef IEEEFP 117 bool_t rv; 118 long tmpl; 119 #else 120 struct ieee_single is; 121 struct vax_single vs, *vsp; 122 struct sgl_limits *lim; 123 int i; 124 #endif 125 switch (xdrs->x_op) { 126 127 case XDR_ENCODE: 128 #ifdef IEEEFP 129 tmpl = *(int32_t *)(void *)fp; 130 return (XDR_PUTLONG(xdrs, &tmpl)); 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 rv = XDR_GETLONG(xdrs, &tmpl); 153 *(int32_t *)(void *)fp = (int32_t)tmpl; 154 return (rv); 155 #else 156 vsp = (struct vax_single *)fp; 157 if (!XDR_GETLONG(xdrs, (long *)&is)) 158 return (FALSE); 159 for (i = 0, lim = sgl_limits; 160 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 161 i++, lim++) { 162 if ((is.exp == lim->ieee.exp) && 163 (is.mantissa == lim->ieee.mantissa)) { 164 *vsp = lim->s; 165 goto doneit; 166 } 167 } 168 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 169 vsp->mantissa2 = is.mantissa; 170 vsp->mantissa1 = (is.mantissa >> 16); 171 doneit: 172 vsp->sign = is.sign; 173 return (TRUE); 174 #endif 175 176 case XDR_FREE: 177 return (TRUE); 178 } 179 /* NOTREACHED */ 180 return (FALSE); 181 } 182 183 #if defined(__vax__) 184 /* What IEEE double precision floating point looks like on a Vax */ 185 struct ieee_double { 186 unsigned int mantissa1 : 20; 187 unsigned int exp : 11; 188 unsigned int sign : 1; 189 unsigned int mantissa2 : 32; 190 }; 191 192 /* Vax double precision floating point */ 193 struct vax_double { 194 unsigned int mantissa1 : 7; 195 unsigned int exp : 8; 196 unsigned int sign : 1; 197 unsigned int mantissa2 : 16; 198 unsigned int mantissa3 : 16; 199 unsigned int mantissa4 : 16; 200 }; 201 202 #define VAX_DBL_BIAS 0x81 203 #define IEEE_DBL_BIAS 0x3ff 204 #define MASK(nbits) ((1 << nbits) - 1) 205 206 static struct dbl_limits { 207 struct vax_double d; 208 struct ieee_double ieee; 209 } dbl_limits[2] = { 210 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 211 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 212 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 213 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 214 }; 215 216 #endif /* vax */ 217 218 219 bool_t 220 xdr_double(xdrs, dp) 221 XDR *xdrs; 222 double *dp; 223 { 224 #ifdef IEEEFP 225 int32_t *i32p; 226 bool_t rv; 227 long tmpl; 228 #else 229 long *lp; 230 struct ieee_double id; 231 struct vax_double vd; 232 struct dbl_limits *lim; 233 int i; 234 #endif 235 236 switch (xdrs->x_op) { 237 238 case XDR_ENCODE: 239 #ifdef IEEEFP 240 i32p = (int32_t *)(void *)dp; 241 #if BYTE_ORDER == BIG_ENDIAN 242 tmpl = *i32p++; 243 rv = XDR_PUTLONG(xdrs, &tmpl); 244 if (!rv) 245 return (rv); 246 tmpl = *i32p; 247 rv = XDR_PUTLONG(xdrs, &tmpl); 248 #else 249 tmpl = *(i32p+1); 250 rv = XDR_PUTLONG(xdrs, &tmpl); 251 if (!rv) 252 return (rv); 253 tmpl = *i32p; 254 rv = XDR_PUTLONG(xdrs, &tmpl); 255 #endif 256 return (rv); 257 #else 258 vd = *((struct vax_double *)dp); 259 for (i = 0, lim = dbl_limits; 260 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 261 i++, lim++) { 262 if ((vd.mantissa4 == lim->d.mantissa4) && 263 (vd.mantissa3 == lim->d.mantissa3) && 264 (vd.mantissa2 == lim->d.mantissa2) && 265 (vd.mantissa1 == lim->d.mantissa1) && 266 (vd.exp == lim->d.exp)) { 267 id = lim->ieee; 268 goto shipit; 269 } 270 } 271 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 272 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 273 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 274 (vd.mantissa3 << 13) | 275 ((vd.mantissa4 >> 3) & MASK(13)); 276 shipit: 277 id.sign = vd.sign; 278 lp = (long *)&id; 279 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp)); 280 #endif 281 282 case XDR_DECODE: 283 #ifdef IEEEFP 284 i32p = (int32_t *)(void *)dp; 285 #if BYTE_ORDER == BIG_ENDIAN 286 rv = XDR_GETLONG(xdrs, &tmpl); 287 *i32p++ = tmpl; 288 if (!rv) 289 return (rv); 290 rv = XDR_GETLONG(xdrs, &tmpl); 291 *i32p = tmpl; 292 #else 293 rv = XDR_GETLONG(xdrs, &tmpl); 294 *(i32p+1) = (int32_t)tmpl; 295 if (!rv) 296 return (rv); 297 rv = XDR_GETLONG(xdrs, &tmpl); 298 *i32p = (int32_t)tmpl; 299 #endif 300 return (rv); 301 #else 302 lp = (long *)&id; 303 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp)) 304 return (FALSE); 305 for (i = 0, lim = dbl_limits; 306 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 307 i++, lim++) { 308 if ((id.mantissa2 == lim->ieee.mantissa2) && 309 (id.mantissa1 == lim->ieee.mantissa1) && 310 (id.exp == lim->ieee.exp)) { 311 vd = lim->d; 312 goto doneit; 313 } 314 } 315 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 316 vd.mantissa1 = (id.mantissa1 >> 13); 317 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 318 (id.mantissa2 >> 29); 319 vd.mantissa3 = (id.mantissa2 >> 13); 320 vd.mantissa4 = (id.mantissa2 << 3); 321 doneit: 322 vd.sign = id.sign; 323 *dp = *((double *)&vd); 324 return (TRUE); 325 #endif 326 327 case XDR_FREE: 328 return (TRUE); 329 } 330 /* NOTREACHED */ 331 return (FALSE); 332 } 333
Indexes created Tue Sep 23 07:09:52 GMT 2025