1 /* $NetBSD: xdr_float.c,v 1.9 1995/06/05 11:48:26 pk 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 #if defined(LIBC_SCCS) && !defined(lint) 33 /*static char *sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/ 34 /*static char *sccsid = "from: @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";*/ 35 static char *rcsid = "$NetBSD: xdr_float.c,v 1.9 1995/06/05 11:48:26 pk Exp $"; 36 #endif 37 38 /* 39 * xdr_float.c, Generic XDR routines impelmentation. 40 * 41 * Copyright (C) 1984, Sun Microsystems, Inc. 42 * 43 * These are the "floating point" xdr routines used to (de)serialize 44 * most common data items. See xdr.h for more info on the interface to 45 * xdr. 46 */ 47 48 #include <stdio.h> 49 #include <sys/types.h> 50 #include <sys/param.h> 51 #include <rpc/types.h> 52 #include <rpc/xdr.h> 53 54 /* 55 * NB: Not portable. 56 * This routine works on machines with IEEE754 FP and Vaxen. 57 */ 58 59 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 60 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) 61 #include <machine/endian.h> 62 #define IEEEFP 63 #endif 64 65 #ifdef vax 66 67 /* What IEEE single precision floating point looks like on a Vax */ 68 struct ieee_single { 69 unsigned int mantissa: 23; 70 unsigned int exp : 8; 71 unsigned int sign : 1; 72 }; 73 74 /* Vax single precision floating point */ 75 struct vax_single { 76 unsigned int mantissa1 : 7; 77 unsigned int exp : 8; 78 unsigned int sign : 1; 79 unsigned int mantissa2 : 16; 80 }; 81 82 #define VAX_SNG_BIAS 0x81 83 #define IEEE_SNG_BIAS 0x7f 84 85 static struct sgl_limits { 86 struct vax_single s; 87 struct ieee_single ieee; 88 } sgl_limits[2] = { 89 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 90 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 91 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 92 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 93 }; 94 #endif /* vax */ 95 96 bool_t 97 xdr_float(xdrs, fp) 98 register XDR *xdrs; 99 register float *fp; 100 { 101 #ifdef IEEEFP 102 bool_t rv; 103 long tmpl; 104 #else 105 struct ieee_single is; 106 struct vax_single vs, *vsp; 107 struct sgl_limits *lim; 108 int i; 109 #endif 110 switch (xdrs->x_op) { 111 112 case XDR_ENCODE: 113 #ifdef IEEEFP 114 tmpl = *(int32_t *)fp; 115 return (XDR_PUTLONG(xdrs, &tmpl)); 116 #else 117 vs = *((struct vax_single *)fp); 118 for (i = 0, lim = sgl_limits; 119 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 120 i++, lim++) { 121 if ((vs.mantissa2 == lim->s.mantissa2) && 122 (vs.exp == lim->s.exp) && 123 (vs.mantissa1 == lim->s.mantissa1)) { 124 is = lim->ieee; 125 goto shipit; 126 } 127 } 128 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 129 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 130 shipit: 131 is.sign = vs.sign; 132 return (XDR_PUTLONG(xdrs, (long *)&is)); 133 #endif 134 135 case XDR_DECODE: 136 #ifdef IEEEFP 137 rv = XDR_GETLONG(xdrs, &tmpl); 138 *(int32_t *)fp = tmpl; 139 return (rv); 140 #else 141 vsp = (struct vax_single *)fp; 142 if (!XDR_GETLONG(xdrs, (long *)&is)) 143 return (FALSE); 144 for (i = 0, lim = sgl_limits; 145 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 146 i++, lim++) { 147 if ((is.exp == lim->ieee.exp) && 148 (is.mantissa == lim->ieee.mantissa)) { 149 *vsp = lim->s; 150 goto doneit; 151 } 152 } 153 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 154 vsp->mantissa2 = is.mantissa; 155 vsp->mantissa1 = (is.mantissa >> 16); 156 doneit: 157 vsp->sign = is.sign; 158 return (TRUE); 159 #endif 160 161 case XDR_FREE: 162 return (TRUE); 163 } 164 return (FALSE); 165 } 166 167 #ifdef vax 168 /* What IEEE double precision floating point looks like on a Vax */ 169 struct ieee_double { 170 unsigned int mantissa1 : 20; 171 unsigned int exp : 11; 172 unsigned int sign : 1; 173 unsigned int mantissa2 : 32; 174 }; 175 176 /* Vax double precision floating point */ 177 struct vax_double { 178 unsigned int mantissa1 : 7; 179 unsigned int exp : 8; 180 unsigned int sign : 1; 181 unsigned int mantissa2 : 16; 182 unsigned int mantissa3 : 16; 183 unsigned int mantissa4 : 16; 184 }; 185 186 #define VAX_DBL_BIAS 0x81 187 #define IEEE_DBL_BIAS 0x3ff 188 #define MASK(nbits) ((1 << nbits) - 1) 189 190 static struct dbl_limits { 191 struct vax_double d; 192 struct ieee_double ieee; 193 } dbl_limits[2] = { 194 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 195 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 196 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 197 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 198 }; 199 200 #endif /* vax */ 201 202 203 bool_t 204 xdr_double(xdrs, dp) 205 register XDR *xdrs; 206 double *dp; 207 { 208 #ifdef IEEEFP 209 register int32_t *i32p; 210 bool_t rv; 211 long tmpl; 212 #else 213 register long *lp; 214 struct ieee_double id; 215 struct vax_double vd; 216 register struct dbl_limits *lim; 217 int i; 218 #endif 219 220 switch (xdrs->x_op) { 221 222 case XDR_ENCODE: 223 #ifdef IEEEFP 224 i32p = (int32_t *)dp; 225 #if BYTE_ORDER == BIG_ENDIAN 226 tmpl = *i32p++; 227 rv = XDR_PUTLONG(xdrs, &tmpl); 228 if (!rv) 229 return (rv); 230 tmpl = *i32p; 231 rv = XDR_PUTLONG(xdrs, &tmpl); 232 #else 233 tmpl = *(i32p+1); 234 rv = XDR_PUTLONG(xdrs, &tmpl); 235 if (!rv) 236 return (rv); 237 tmpl = *i32p; 238 rv = XDR_PUTLONG(xdrs, &tmpl); 239 #endif 240 return (rv); 241 #else 242 vd = *((struct vax_double *)dp); 243 for (i = 0, lim = dbl_limits; 244 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 245 i++, lim++) { 246 if ((vd.mantissa4 == lim->d.mantissa4) && 247 (vd.mantissa3 == lim->d.mantissa3) && 248 (vd.mantissa2 == lim->d.mantissa2) && 249 (vd.mantissa1 == lim->d.mantissa1) && 250 (vd.exp == lim->d.exp)) { 251 id = lim->ieee; 252 goto shipit; 253 } 254 } 255 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 256 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 257 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 258 (vd.mantissa3 << 13) | 259 ((vd.mantissa4 >> 3) & MASK(13)); 260 shipit: 261 id.sign = vd.sign; 262 lp = (long *)&id; 263 return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp)); 264 #endif 265 266 case XDR_DECODE: 267 #ifdef IEEEFP 268 i32p = (int32_t *)dp; 269 #if BYTE_ORDER == BIG_ENDIAN 270 rv = XDR_GETLONG(xdrs, &tmpl); 271 *i32p++ = tmpl; 272 if (!rv) 273 return (rv); 274 rv = XDR_GETLONG(xdrs, &tmpl); 275 *i32p = tmpl; 276 #else 277 rv = XDR_GETLONG(xdrs, &tmpl); 278 *(i32p+1) = tmpl; 279 if (!rv) 280 return (rv); 281 rv = XDR_GETLONG(xdrs, &tmpl); 282 *i32p = tmpl; 283 #endif 284 return (rv); 285 #else 286 lp = (long *)&id; 287 if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp)) 288 return (FALSE); 289 for (i = 0, lim = dbl_limits; 290 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 291 i++, lim++) { 292 if ((id.mantissa2 == lim->ieee.mantissa2) && 293 (id.mantissa1 == lim->ieee.mantissa1) && 294 (id.exp == lim->ieee.exp)) { 295 vd = lim->d; 296 goto doneit; 297 } 298 } 299 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 300 vd.mantissa1 = (id.mantissa1 >> 13); 301 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 302 (id.mantissa2 >> 29); 303 vd.mantissa3 = (id.mantissa2 >> 13); 304 vd.mantissa4 = (id.mantissa2 << 3); 305 doneit: 306 vd.sign = id.sign; 307 *dp = *((double *)&vd); 308 return (TRUE); 309 #endif 310 311 case XDR_FREE: 312 return (TRUE); 313 } 314 return (FALSE); 315 } 316