1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 * 29 * @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro 30 * @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC 31 * $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ 32 * $FreeBSD: src/lib/libc/xdr/xdr_float.c,v 1.14 2004/10/16 06:32:43 obrien Exp $ 33 */ 34 35 /* 36 * xdr_float.c, Generic XDR routines implementation. 37 * 38 * Copyright (C) 1984, Sun Microsystems, Inc. 39 * 40 * These are the "floating point" xdr routines used to (de)serialize 41 * most common data items. See xdr.h for more info on the interface to 42 * xdr. 43 */ 44 45 #include "namespace.h" 46 #include <sys/types.h> 47 #include <sys/param.h> 48 49 #include <stdio.h> 50 51 #include <rpc/types.h> 52 #include <rpc/xdr.h> 53 #include "un-namespace.h" 54 55 /* 56 * NB: Not portable. 57 * This routine works on machines with IEEE754 FP and Vaxen. 58 */ 59 60 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 61 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \ 62 defined(__arm__) || defined(__ppc__) || defined(__ia64__) || \ 63 defined(__arm26__) || defined(__sparc64__) || defined(__x86_64__) 64 #include <machine/endian.h> 65 #define IEEEFP 66 #endif 67 68 #if defined(__vax__) 69 70 /* What IEEE single precision floating point looks like on a Vax */ 71 struct ieee_single { 72 unsigned int mantissa: 23; 73 unsigned int exp : 8; 74 unsigned int sign : 1; 75 }; 76 77 /* Vax single precision floating point */ 78 struct vax_single { 79 unsigned int mantissa1 : 7; 80 unsigned int exp : 8; 81 unsigned int sign : 1; 82 unsigned int mantissa2 : 16; 83 }; 84 85 #define VAX_SNG_BIAS 0x81 86 #define IEEE_SNG_BIAS 0x7f 87 88 static struct sgl_limits { 89 struct vax_single s; 90 struct ieee_single ieee; 91 } sgl_limits[2] = { 92 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 93 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 94 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 95 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 96 }; 97 #endif /* vax */ 98 99 bool_t 100 xdr_float(XDR *xdrs, float *fp) 101 { 102 #ifndef IEEEFP 103 struct ieee_single is; 104 struct vax_single vs, *vsp; 105 struct sgl_limits *lim; 106 int i; 107 #endif 108 switch (xdrs->x_op) { 109 110 case XDR_ENCODE: 111 #ifdef IEEEFP 112 return (XDR_PUTINT32(xdrs, (int32_t *)fp)); 113 #else 114 vs = *((struct vax_single *)fp); 115 for (i = 0, lim = sgl_limits; 116 i < NELEM(sgl_limits); 117 i++, lim++) { 118 if ((vs.mantissa2 == lim->s.mantissa2) && 119 (vs.exp == lim->s.exp) && 120 (vs.mantissa1 == lim->s.mantissa1)) { 121 is = lim->ieee; 122 goto shipit; 123 } 124 } 125 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 126 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 127 shipit: 128 is.sign = vs.sign; 129 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 130 #endif 131 132 case XDR_DECODE: 133 #ifdef IEEEFP 134 return (XDR_GETINT32(xdrs, (int32_t *)fp)); 135 #else 136 vsp = (struct vax_single *)fp; 137 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 138 return (FALSE); 139 for (i = 0, lim = sgl_limits; 140 i < NELEM(sgl_limits); 141 i++, lim++) { 142 if ((is.exp == lim->ieee.exp) && 143 (is.mantissa == lim->ieee.mantissa)) { 144 *vsp = lim->s; 145 goto doneit; 146 } 147 } 148 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 149 vsp->mantissa2 = is.mantissa; 150 vsp->mantissa1 = (is.mantissa >> 16); 151 doneit: 152 vsp->sign = is.sign; 153 return (TRUE); 154 #endif 155 156 case XDR_FREE: 157 return (TRUE); 158 } 159 /* NOTREACHED */ 160 return (FALSE); 161 } 162 163 #if defined(__vax__) 164 /* What IEEE double precision floating point looks like on a Vax */ 165 struct ieee_double { 166 unsigned int mantissa1 : 20; 167 unsigned int exp : 11; 168 unsigned int sign : 1; 169 unsigned int mantissa2 : 32; 170 }; 171 172 /* Vax double precision floating point */ 173 struct vax_double { 174 unsigned int mantissa1 : 7; 175 unsigned int exp : 8; 176 unsigned int sign : 1; 177 unsigned int mantissa2 : 16; 178 unsigned int mantissa3 : 16; 179 unsigned int mantissa4 : 16; 180 }; 181 182 #define VAX_DBL_BIAS 0x81 183 #define IEEE_DBL_BIAS 0x3ff 184 #define MASK(nbits) ((1 << nbits) - 1) 185 186 static struct dbl_limits { 187 struct vax_double d; 188 struct ieee_double ieee; 189 } dbl_limits[2] = { 190 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 191 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 192 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 193 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 194 }; 195 196 #endif /* vax */ 197 198 199 bool_t 200 xdr_double(XDR *xdrs, double *dp) 201 { 202 #ifdef IEEEFP 203 int32_t *i32p; 204 bool_t rv; 205 #else 206 int32_t *lp; 207 struct ieee_double id; 208 struct vax_double vd; 209 struct dbl_limits *lim; 210 int i; 211 #endif 212 213 switch (xdrs->x_op) { 214 215 case XDR_ENCODE: 216 #ifdef IEEEFP 217 i32p = (int32_t *)(void *)dp; 218 #if BYTE_ORDER == BIG_ENDIAN 219 rv = XDR_PUTINT32(xdrs, i32p); 220 if (!rv) 221 return (rv); 222 rv = XDR_PUTINT32(xdrs, i32p+1); 223 #else 224 rv = XDR_PUTINT32(xdrs, i32p+1); 225 if (!rv) 226 return (rv); 227 rv = XDR_PUTINT32(xdrs, i32p); 228 #endif 229 return (rv); 230 #else 231 vd = *((struct vax_double *)dp); 232 for (i = 0, lim = dbl_limits; 233 i < NELEM(dbl_limits); 234 i++, lim++) { 235 if ((vd.mantissa4 == lim->d.mantissa4) && 236 (vd.mantissa3 == lim->d.mantissa3) && 237 (vd.mantissa2 == lim->d.mantissa2) && 238 (vd.mantissa1 == lim->d.mantissa1) && 239 (vd.exp == lim->d.exp)) { 240 id = lim->ieee; 241 goto shipit; 242 } 243 } 244 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 245 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 246 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 247 (vd.mantissa3 << 13) | 248 ((vd.mantissa4 >> 3) & MASK(13)); 249 shipit: 250 id.sign = vd.sign; 251 lp = (int32_t *)&id; 252 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 253 #endif 254 255 case XDR_DECODE: 256 #ifdef IEEEFP 257 i32p = (int32_t *)(void *)dp; 258 #if BYTE_ORDER == BIG_ENDIAN 259 rv = XDR_GETINT32(xdrs, i32p); 260 if (!rv) 261 return (rv); 262 rv = XDR_GETINT32(xdrs, i32p+1); 263 #else 264 rv = XDR_GETINT32(xdrs, i32p+1); 265 if (!rv) 266 return (rv); 267 rv = XDR_GETINT32(xdrs, i32p); 268 #endif 269 return (rv); 270 #else 271 lp = (int32_t *)&id; 272 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 273 return (FALSE); 274 for (i = 0, lim = dbl_limits; 275 i < NELEM(dbl_limits); 276 i++, lim++) { 277 if ((id.mantissa2 == lim->ieee.mantissa2) && 278 (id.mantissa1 == lim->ieee.mantissa1) && 279 (id.exp == lim->ieee.exp)) { 280 vd = lim->d; 281 goto doneit; 282 } 283 } 284 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 285 vd.mantissa1 = (id.mantissa1 >> 13); 286 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 287 (id.mantissa2 >> 29); 288 vd.mantissa3 = (id.mantissa2 >> 13); 289 vd.mantissa4 = (id.mantissa2 << 3); 290 doneit: 291 vd.sign = id.sign; 292 *dp = *((double *)&vd); 293 return (TRUE); 294 #endif 295 296 case XDR_FREE: 297 return (TRUE); 298 } 299 /* NOTREACHED */ 300 return (FALSE); 301 } 302