1 /* $NetBSD: xdr_float.c,v 1.24 2000/12/20 20:52:50 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 1.24 2000/12/20 20:52:50 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 "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 #ifndef IEEEFP 117 struct ieee_single is; 118 struct vax_single vs, *vsp; 119 struct sgl_limits *lim; 120 int i; 121 #endif 122 switch (xdrs->x_op) { 123 124 case XDR_ENCODE: 125 #ifdef IEEEFP 126 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)fp)); 127 #else 128 vs = *((struct vax_single *)fp); 129 for (i = 0, lim = sgl_limits; 130 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 131 i++, lim++) { 132 if ((vs.mantissa2 == lim->s.mantissa2) && 133 (vs.exp == lim->s.exp) && 134 (vs.mantissa1 == lim->s.mantissa1)) { 135 is = lim->ieee; 136 goto shipit; 137 } 138 } 139 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 140 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 141 shipit: 142 is.sign = vs.sign; 143 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 144 #endif 145 146 case XDR_DECODE: 147 #ifdef IEEEFP 148 return (XDR_GETINT32(xdrs, (int32_t *)(void *)fp)); 149 #else 150 vsp = (struct vax_single *)fp; 151 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 152 return (FALSE); 153 for (i = 0, lim = sgl_limits; 154 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 155 i++, lim++) { 156 if ((is.exp == lim->ieee.exp) && 157 (is.mantissa == lim->ieee.mantissa)) { 158 *vsp = lim->s; 159 goto doneit; 160 } 161 } 162 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 163 vsp->mantissa2 = is.mantissa; 164 vsp->mantissa1 = (is.mantissa >> 16); 165 doneit: 166 vsp->sign = is.sign; 167 return (TRUE); 168 #endif 169 170 case XDR_FREE: 171 return (TRUE); 172 } 173 /* NOTREACHED */ 174 return (FALSE); 175 } 176 177 #if defined(__vax__) 178 /* What IEEE double precision floating point looks like on a Vax */ 179 struct ieee_double { 180 unsigned int mantissa1 : 20; 181 unsigned int exp : 11; 182 unsigned int sign : 1; 183 unsigned int mantissa2 : 32; 184 }; 185 186 /* Vax double precision floating point */ 187 struct vax_double { 188 unsigned int mantissa1 : 7; 189 unsigned int exp : 8; 190 unsigned int sign : 1; 191 unsigned int mantissa2 : 16; 192 unsigned int mantissa3 : 16; 193 unsigned int mantissa4 : 16; 194 }; 195 196 #define VAX_DBL_BIAS 0x81 197 #define IEEE_DBL_BIAS 0x3ff 198 #define MASK(nbits) ((1 << nbits) - 1) 199 200 static struct dbl_limits { 201 struct vax_double d; 202 struct ieee_double ieee; 203 } dbl_limits[2] = { 204 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 205 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 206 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 207 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 208 }; 209 210 #endif /* vax */ 211 212 213 bool_t 214 xdr_double(xdrs, dp) 215 XDR *xdrs; 216 double *dp; 217 { 218 #ifdef IEEEFP 219 int32_t *i32p; 220 bool_t rv; 221 #else 222 int32_t *lp; 223 struct ieee_double id; 224 struct vax_double vd; 225 struct dbl_limits *lim; 226 int i; 227 #endif 228 229 switch (xdrs->x_op) { 230 231 case XDR_ENCODE: 232 #ifdef IEEEFP 233 i32p = (int32_t *)(void *)dp; 234 #if BYTE_ORDER == BIG_ENDIAN 235 rv = XDR_PUTINT32(xdrs, i32p); 236 if (!rv) 237 return (rv); 238 rv = XDR_PUTINT32(xdrs, i32p+1); 239 #else 240 rv = XDR_PUTINT32(xdrs, i32p+1); 241 if (!rv) 242 return (rv); 243 rv = XDR_PUTINT32(xdrs, i32p); 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 = (int32_t *)&id; 268 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 269 #endif 270 271 case XDR_DECODE: 272 #ifdef IEEEFP 273 i32p = (int32_t *)(void *)dp; 274 #if BYTE_ORDER == BIG_ENDIAN 275 rv = XDR_GETINT32(xdrs, i32p); 276 if (!rv) 277 return (rv); 278 rv = XDR_GETINT32(xdrs, i32p+1); 279 #else 280 rv = XDR_GETINT32(xdrs, i32p+1); 281 if (!rv) 282 return (rv); 283 rv = XDR_GETINT32(xdrs, i32p); 284 #endif 285 return (rv); 286 #else 287 lp = (int32_t *)&id; 288 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 289 return (FALSE); 290 for (i = 0, lim = dbl_limits; 291 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 292 i++, lim++) { 293 if ((id.mantissa2 == lim->ieee.mantissa2) && 294 (id.mantissa1 == lim->ieee.mantissa1) && 295 (id.exp == lim->ieee.exp)) { 296 vd = lim->d; 297 goto doneit; 298 } 299 } 300 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 301 vd.mantissa1 = (id.mantissa1 >> 13); 302 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 303 (id.mantissa2 >> 29); 304 vd.mantissa3 = (id.mantissa2 >> 13); 305 vd.mantissa4 = (id.mantissa2 << 3); 306 doneit: 307 vd.sign = id.sign; 308 *dp = *((double *)&vd); 309 return (TRUE); 310 #endif 311 312 case XDR_FREE: 313 return (TRUE); 314 } 315 /* NOTREACHED */ 316 return (FALSE); 317 } 318