xdr_float.c revision 1.12
1 /* $NetBSD: xdr_float.c,v 1.12 1997/07/13 20:13:30 christos 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 1.12 1997/07/13 20:13:30 christos 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 <stdio.h> 53 #include <sys/types.h> 54 #include <sys/param.h> 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 58 /* 59 * NB: Not portable. 60 * This routine works on machines with IEEE754 FP and Vaxen. 61 */ 62 63 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 64 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \ 65 defined(__arm32__) || defined(__powerpc__) 66 #include <machine/endian.h> 67 #define IEEEFP 68 #endif 69 70 #ifdef vax 71 72 /* What IEEE single precision floating point looks like on a Vax */ 73 struct ieee_single { 74 unsigned int mantissa: 23; 75 unsigned int exp : 8; 76 unsigned int sign : 1; 77 }; 78 79 /* Vax single precision floating point */ 80 struct vax_single { 81 unsigned int mantissa1 : 7; 82 unsigned int exp : 8; 83 unsigned int sign : 1; 84 unsigned int mantissa2 : 16; 85 }; 86 87 #define VAX_SNG_BIAS 0x81 88 #define IEEE_SNG_BIAS 0x7f 89 90 static struct sgl_limits { 91 struct vax_single s; 92 struct ieee_single ieee; 93 } sgl_limits[2] = { 94 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 95 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 96 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 97 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 98 }; 99 #endif /* vax */ 100 101 bool_t 102 xdr_float(xdrs, fp) 103 register XDR *xdrs; 104 register float *fp; 105 { 106 #ifdef IEEEFP 107 bool_t rv; 108 long tmpl; 109 #else 110 struct ieee_single is; 111 struct vax_single vs, *vsp; 112 struct sgl_limits *lim; 113 int i; 114 #endif 115 switch (xdrs->x_op) { 116 117 case XDR_ENCODE: 118 #ifdef IEEEFP 119 tmpl = *(int32_t *)fp; 120 return (XDR_PUTLONG(xdrs, &tmpl)); 121 #else 122 vs = *((struct vax_single *)fp); 123 for (i = 0, lim = sgl_limits; 124 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 125 i++, lim++) { 126 if ((vs.mantissa2 == lim->s.mantissa2) && 127 (vs.exp == lim->s.exp) && 128 (vs.mantissa1 == lim->s.mantissa1)) { 129 is = lim->ieee; 130 goto shipit; 131 } 132 } 133 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 134 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 135 shipit: 136 is.sign = vs.sign; 137 return (XDR_PUTLONG(xdrs, (long *)&is)); 138 #endif 139 140 case XDR_DECODE: 141 #ifdef IEEEFP 142 rv = XDR_GETLONG(xdrs, &tmpl); 143 *(int32_t *)fp = tmpl; 144 return (rv); 145 #else 146 vsp = (struct vax_single *)fp; 147 if (!XDR_GETLONG(xdrs, (long *)&is)) 148 return (FALSE); 149 for (i = 0, lim = sgl_limits; 150 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 151 i++, lim++) { 152 if ((is.exp == lim->ieee.exp) && 153 (is.mantissa == lim->ieee.mantissa)) { 154 *vsp = lim->s; 155 goto doneit; 156 } 157 } 158 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 159 vsp->mantissa2 = is.mantissa; 160 vsp->mantissa1 = (is.mantissa >> 16); 161 doneit: 162 vsp->sign = is.sign; 163 return (TRUE); 164 #endif 165 166 case XDR_FREE: 167 return (TRUE); 168 } 169 return (FALSE); 170 } 171 172 #ifdef vax 173 /* What IEEE double precision floating point looks like on a Vax */ 174 struct ieee_double { 175 unsigned int mantissa1 : 20; 176 unsigned int exp : 11; 177 unsigned int sign : 1; 178 unsigned int mantissa2 : 32; 179 }; 180 181 /* Vax double precision floating point */ 182 struct vax_double { 183 unsigned int mantissa1 : 7; 184 unsigned int exp : 8; 185 unsigned int sign : 1; 186 unsigned int mantissa2 : 16; 187 unsigned int mantissa3 : 16; 188 unsigned int mantissa4 : 16; 189 }; 190 191 #define VAX_DBL_BIAS 0x81 192 #define IEEE_DBL_BIAS 0x3ff 193 #define MASK(nbits) ((1 << nbits) - 1) 194 195 static struct dbl_limits { 196 struct vax_double d; 197 struct ieee_double ieee; 198 } dbl_limits[2] = { 199 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 200 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 201 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 202 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 203 }; 204 205 #endif /* vax */ 206 207 208 bool_t 209 xdr_double(xdrs, dp) 210 register XDR *xdrs; 211 double *dp; 212 { 213 #ifdef IEEEFP 214 register int32_t *i32p; 215 bool_t rv; 216 long tmpl; 217 #else 218 register long *lp; 219 struct ieee_double id; 220 struct vax_double vd; 221 register struct dbl_limits *lim; 222 int i; 223 #endif 224 225 switch (xdrs->x_op) { 226 227 case XDR_ENCODE: 228 #ifdef IEEEFP 229 i32p = (int32_t *)dp; 230 #if BYTE_ORDER == BIG_ENDIAN 231 tmpl = *i32p++; 232 rv = XDR_PUTLONG(xdrs, &tmpl); 233 if (!rv) 234 return (rv); 235 tmpl = *i32p; 236 rv = XDR_PUTLONG(xdrs, &tmpl); 237 #else 238 tmpl = *(i32p+1); 239 rv = XDR_PUTLONG(xdrs, &tmpl); 240 if (!rv) 241 return (rv); 242 tmpl = *i32p; 243 rv = XDR_PUTLONG(xdrs, &tmpl); 244 #endif 245 return (rv); 246 #else 247 vd = *((struct vax_double *)dp); 248 for (i = 0, lim = dbl_limits; 249 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 250 i++, lim++) { 251 if ((vd.mantissa4 == lim->d.mantissa4) && 252 (vd.mantissa3 == lim->d.mantissa3) && 253 (vd.mantissa2 == lim->d.mantissa2) && 254 (vd.mantissa1 == lim->d.mantissa1) && 255 (vd.exp == lim->d.exp)) { 256 id = lim->ieee; 257 goto shipit; 258 } 259 } 260 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 261 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 262 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 263 (vd.mantissa3 << 13) | 264 ((vd.mantissa4 >> 3) & MASK(13)); 265 shipit: 266 id.sign = vd.sign; 267 lp = (long *)&id; 268 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp)); 269 #endif 270 271 case XDR_DECODE: 272 #ifdef IEEEFP 273 i32p = (int32_t *)dp; 274 #if BYTE_ORDER == BIG_ENDIAN 275 rv = XDR_GETLONG(xdrs, &tmpl); 276 *i32p++ = tmpl; 277 if (!rv) 278 return (rv); 279 rv = XDR_GETLONG(xdrs, &tmpl); 280 *i32p = tmpl; 281 #else 282 rv = XDR_GETLONG(xdrs, &tmpl); 283 *(i32p+1) = tmpl; 284 if (!rv) 285 return (rv); 286 rv = XDR_GETLONG(xdrs, &tmpl); 287 *i32p = tmpl; 288 #endif 289 return (rv); 290 #else 291 lp = (long *)&id; 292 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp)) 293 return (FALSE); 294 for (i = 0, lim = dbl_limits; 295 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 296 i++, lim++) { 297 if ((id.mantissa2 == lim->ieee.mantissa2) && 298 (id.mantissa1 == lim->ieee.mantissa1) && 299 (id.exp == lim->ieee.exp)) { 300 vd = lim->d; 301 goto doneit; 302 } 303 } 304 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 305 vd.mantissa1 = (id.mantissa1 >> 13); 306 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 307 (id.mantissa2 >> 29); 308 vd.mantissa3 = (id.mantissa2 >> 13); 309 vd.mantissa4 = (id.mantissa2 << 3); 310 doneit: 311 vd.sign = id.sign; 312 *dp = *((double *)&vd); 313 return (TRUE); 314 #endif 315 316 case XDR_FREE: 317 return (TRUE); 318 } 319 return (FALSE); 320 } 321
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