xdr_float.c revision 1.40
1 /* $NetBSD: xdr_float.c,v 1.40 2014/08/24 17:07:00 matt Exp $ */ 2 3 /* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #if defined(LIBC_SCCS) && !defined(lint) 36 #if 0 37 static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro"; 38 static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC"; 39 #else 40 __RCSID("$NetBSD: xdr_float.c,v 1.40 2014/08/24 17:07:00 matt Exp $"); 41 #endif 42 #endif 43 44 /* 45 * xdr_float.c, Generic XDR routines implementation. 46 * 47 * Copyright (C) 1984, Sun Microsystems, Inc. 48 * 49 * These are the "floating point" xdr routines used to (de)serialize 50 * most common data items. See xdr.h for more info on the interface to 51 * xdr. 52 */ 53 54 #include "namespace.h" 55 56 #include <sys/types.h> 57 #include <sys/param.h> 58 59 #include <stdio.h> 60 61 #include <rpc/types.h> 62 #include <rpc/xdr.h> 63 64 #ifdef __weak_alias 65 __weak_alias(xdr_double,_xdr_double) 66 __weak_alias(xdr_float,_xdr_float) 67 #endif 68 69 /* 70 * NB: Not portable. 71 * This routine works on machines with IEEE754 FP and Vaxen. 72 */ 73 74 #if !defined(__vax__) 75 #include <machine/endian.h> 76 #define IEEEFP 77 #endif 78 79 #if defined(__vax__) 80 81 /* What IEEE single precision floating point looks like on a Vax */ 82 struct ieee_single { 83 unsigned int mantissa: 23; 84 unsigned int exp : 8; 85 unsigned int sign : 1; 86 }; 87 88 /* Vax single precision floating point */ 89 struct vax_single { 90 unsigned int mantissa1 : 7; 91 unsigned int exp : 8; 92 unsigned int sign : 1; 93 unsigned int mantissa2 : 16; 94 }; 95 96 #define VAX_SNG_BIAS 0x81 97 #define IEEE_SNG_BIAS 0x7f 98 99 static struct sgl_limits { 100 struct vax_single s; 101 struct ieee_single ieee; 102 } sgl_limits[2] = { 103 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 104 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 105 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 106 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 107 }; 108 #endif /* vax */ 109 110 bool_t 111 xdr_float(XDR *xdrs, float *fp) 112 { 113 #ifndef IEEEFP 114 struct ieee_single is; 115 struct vax_single vs, *vsp; 116 struct sgl_limits *lim; 117 size_t i; 118 #endif 119 switch (xdrs->x_op) { 120 121 case XDR_ENCODE: 122 #ifdef IEEEFP 123 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)fp)); 124 #else 125 vs = *((struct vax_single *)(void *)fp); 126 for (i = 0, lim = sgl_limits; 127 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 128 i++, lim++) { 129 if ((vs.mantissa2 == lim->s.mantissa2) && 130 (vs.exp == lim->s.exp) && 131 (vs.mantissa1 == lim->s.mantissa1)) { 132 is = lim->ieee; 133 goto shipit; 134 } 135 } 136 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 137 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 138 shipit: 139 is.sign = vs.sign; 140 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)&is)); 141 #endif 142 143 case XDR_DECODE: 144 #ifdef IEEEFP 145 return (XDR_GETINT32(xdrs, (int32_t *)(void *)fp)); 146 #else 147 vsp = (struct vax_single *)(void *)fp; 148 if (!XDR_GETINT32(xdrs, (int32_t *)(void *)&is)) 149 return (FALSE); 150 for (i = 0, lim = sgl_limits; 151 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 152 i++, lim++) { 153 if ((is.exp == lim->ieee.exp) && 154 (is.mantissa == lim->ieee.mantissa)) { 155 *vsp = lim->s; 156 goto doneit; 157 } 158 } 159 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 160 vsp->mantissa2 = is.mantissa; 161 vsp->mantissa1 = ((unsigned int)is.mantissa >> 16); 162 doneit: 163 vsp->sign = is.sign; 164 return (TRUE); 165 #endif 166 167 case XDR_FREE: 168 return (TRUE); 169 } 170 /* NOTREACHED */ 171 return (FALSE); 172 } 173 174 #if defined(__vax__) 175 /* What IEEE double precision floating point looks like on a Vax */ 176 struct ieee_double { 177 unsigned int mantissa1 : 20; 178 unsigned int exp : 11; 179 unsigned int sign : 1; 180 unsigned int mantissa2 : 32; 181 }; 182 183 /* Vax double precision floating point */ 184 struct vax_double { 185 unsigned int mantissa1 : 7; 186 unsigned int exp : 8; 187 unsigned int sign : 1; 188 unsigned int mantissa2 : 16; 189 unsigned int mantissa3 : 16; 190 unsigned int mantissa4 : 16; 191 }; 192 193 #define VAX_DBL_BIAS 0x81 194 #define IEEE_DBL_BIAS 0x3ff 195 #define MASK(nbits) ((1 << nbits) - 1) 196 197 static struct dbl_limits { 198 struct vax_double d; 199 struct ieee_double ieee; 200 } dbl_limits[2] = { 201 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 202 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 203 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 204 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 205 }; 206 207 #endif /* vax */ 208 209 210 bool_t 211 xdr_double(XDR *xdrs, double *dp) 212 { 213 #ifdef IEEEFP 214 int32_t *i32p; 215 bool_t rv; 216 #else 217 int32_t *lp; 218 struct ieee_double id; 219 struct vax_double vd; 220 struct dbl_limits *lim; 221 size_t i; 222 #endif 223 224 switch (xdrs->x_op) { 225 226 case XDR_ENCODE: 227 #ifdef IEEEFP 228 i32p = (int32_t *)(void *)dp; 229 #if (BYTE_ORDER == BIG_ENDIAN) || \ 230 (defined(__arm__) && !defined(__VFP_FP__)) 231 rv = XDR_PUTINT32(xdrs, i32p); 232 if (!rv) 233 return (rv); 234 rv = XDR_PUTINT32(xdrs, i32p+1); 235 #else 236 rv = XDR_PUTINT32(xdrs, i32p+1); 237 if (!rv) 238 return (rv); 239 rv = XDR_PUTINT32(xdrs, i32p); 240 #endif 241 return (rv); 242 #else 243 vd = *((struct vax_double *)(void *)dp); 244 for (i = 0, lim = dbl_limits; 245 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 246 i++, lim++) { 247 if ((vd.mantissa4 == lim->d.mantissa4) && 248 (vd.mantissa3 == lim->d.mantissa3) && 249 (vd.mantissa2 == lim->d.mantissa2) && 250 (vd.mantissa1 == lim->d.mantissa1) && 251 (vd.exp == lim->d.exp)) { 252 id = lim->ieee; 253 goto shipit; 254 } 255 } 256 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 257 id.mantissa1 = (vd.mantissa1 << 13) | 258 ((unsigned int)vd.mantissa2 >> 3); 259 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 260 (vd.mantissa3 << 13) | 261 (((unsigned int)vd.mantissa4 >> 3) & MASK(13)); 262 shipit: 263 id.sign = vd.sign; 264 lp = (int32_t *)(void *)&id; 265 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 266 #endif 267 268 case XDR_DECODE: 269 #ifdef IEEEFP 270 i32p = (int32_t *)(void *)dp; 271 #if BYTE_ORDER == BIG_ENDIAN || \ 272 (defined(__arm__) && !defined(__VFP_FP__)) 273 rv = XDR_GETINT32(xdrs, i32p); 274 if (!rv) 275 return (rv); 276 rv = XDR_GETINT32(xdrs, i32p+1); 277 #else 278 rv = XDR_GETINT32(xdrs, i32p+1); 279 if (!rv) 280 return (rv); 281 rv = XDR_GETINT32(xdrs, i32p); 282 #endif 283 return (rv); 284 #else 285 lp = (int32_t *)(void *)&id; 286 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 287 return (FALSE); 288 for (i = 0, lim = dbl_limits; 289 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 290 i++, lim++) { 291 if ((id.mantissa2 == lim->ieee.mantissa2) && 292 (id.mantissa1 == lim->ieee.mantissa1) && 293 (id.exp == lim->ieee.exp)) { 294 vd = lim->d; 295 goto doneit; 296 } 297 } 298 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 299 vd.mantissa1 = ((unsigned int)id.mantissa1 >> 13); 300 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 301 ((unsigned int)id.mantissa2 >> 29); 302 vd.mantissa3 = ((unsigned int)id.mantissa2 >> 13); 303 vd.mantissa4 = (id.mantissa2 << 3); 304 doneit: 305 vd.sign = id.sign; 306 *dp = *((double *)(void *)&vd); 307 return (TRUE); 308 #endif 309 310 case XDR_FREE: 311 return (TRUE); 312 } 313 /* NOTREACHED */ 314 return (FALSE); 315 } 316
Indexes created Tue Sep 30 20:09:53 GMT 2025