xdr_float.c revision 1.38
1 /* $NetBSD: xdr_float.c,v 1.38 2013/03/11 20:19:29 tron 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 1.38 2013/03/11 20:19:29 tron 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(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 75 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \ 76 defined(__arm__) || defined(__powerpc__) || defined(__sh__) || \ 77 defined(__x86_64__) || defined(__hppa__) || defined(__ia64__) 78 #include <machine/endian.h> 79 #define IEEEFP 80 #endif 81 82 #if defined(__vax__) 83 84 /* What IEEE single precision floating point looks like on a Vax */ 85 struct ieee_single { 86 unsigned int mantissa: 23; 87 unsigned int exp : 8; 88 unsigned int sign : 1; 89 }; 90 91 /* Vax single precision floating point */ 92 struct vax_single { 93 unsigned int mantissa1 : 7; 94 unsigned int exp : 8; 95 unsigned int sign : 1; 96 unsigned int mantissa2 : 16; 97 }; 98 99 #define VAX_SNG_BIAS 0x81 100 #define IEEE_SNG_BIAS 0x7f 101 102 static struct sgl_limits { 103 struct vax_single s; 104 struct ieee_single ieee; 105 } sgl_limits[2] = { 106 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 107 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 108 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 109 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 110 }; 111 #endif /* vax */ 112 113 bool_t 114 xdr_float(XDR *xdrs, float *fp) 115 { 116 #ifndef IEEEFP 117 struct ieee_single is; 118 struct vax_single vs, *vsp; 119 struct sgl_limits *lim; 120 size_t 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 *)(void *)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 *)(void *)&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 *)(void *)fp; 151 if (!XDR_GETINT32(xdrs, (int32_t *)(void *)&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 = ((unsigned int)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(XDR *xdrs, double *dp) 215 { 216 #ifdef IEEEFP 217 int32_t *i32p; 218 bool_t rv; 219 #else 220 int32_t *lp; 221 struct ieee_double id; 222 struct vax_double vd; 223 struct dbl_limits *lim; 224 size_t i; 225 #endif 226 227 switch (xdrs->x_op) { 228 229 case XDR_ENCODE: 230 #ifdef IEEEFP 231 i32p = (int32_t *)(void *)dp; 232 #if (BYTE_ORDER == BIG_ENDIAN) || \ 233 (defined(__arm__) && !defined(__VFP_FP__)) 234 rv = XDR_PUTINT32(xdrs, i32p); 235 if (!rv) 236 return (rv); 237 rv = XDR_PUTINT32(xdrs, i32p+1); 238 #else 239 rv = XDR_PUTINT32(xdrs, i32p+1); 240 if (!rv) 241 return (rv); 242 rv = XDR_PUTINT32(xdrs, i32p); 243 #endif 244 return (rv); 245 #else 246 vd = *((struct vax_double *)(void *)dp); 247 for (i = 0, lim = dbl_limits; 248 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 249 i++, lim++) { 250 if ((vd.mantissa4 == lim->d.mantissa4) && 251 (vd.mantissa3 == lim->d.mantissa3) && 252 (vd.mantissa2 == lim->d.mantissa2) && 253 (vd.mantissa1 == lim->d.mantissa1) && 254 (vd.exp == lim->d.exp)) { 255 id = lim->ieee; 256 goto shipit; 257 } 258 } 259 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 260 id.mantissa1 = (vd.mantissa1 << 13) | 261 ((unsigned int)vd.mantissa2 >> 3); 262 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 263 (vd.mantissa3 << 13) | 264 (((unsigned int)vd.mantissa4 >> 3) & MASK(13)); 265 shipit: 266 id.sign = vd.sign; 267 lp = (int32_t *)(void *)&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 (defined(__arm__) && !defined(__VFP_FP__)) 276 rv = XDR_GETINT32(xdrs, i32p); 277 if (!rv) 278 return (rv); 279 rv = XDR_GETINT32(xdrs, i32p+1); 280 #else 281 rv = XDR_GETINT32(xdrs, i32p+1); 282 if (!rv) 283 return (rv); 284 rv = XDR_GETINT32(xdrs, i32p); 285 #endif 286 return (rv); 287 #else 288 lp = (int32_t *)(void *)&id; 289 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 290 return (FALSE); 291 for (i = 0, lim = dbl_limits; 292 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 293 i++, lim++) { 294 if ((id.mantissa2 == lim->ieee.mantissa2) && 295 (id.mantissa1 == lim->ieee.mantissa1) && 296 (id.exp == lim->ieee.exp)) { 297 vd = lim->d; 298 goto doneit; 299 } 300 } 301 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 302 vd.mantissa1 = ((unsigned int)id.mantissa1 >> 13); 303 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 304 ((unsigned int)id.mantissa2 >> 29); 305 vd.mantissa3 = ((unsigned int)id.mantissa2 >> 13); 306 vd.mantissa4 = (id.mantissa2 << 3); 307 doneit: 308 vd.sign = id.sign; 309 *dp = *((double *)(void *)&vd); 310 return (TRUE); 311 #endif 312 313 case XDR_FREE: 314 return (TRUE); 315 } 316 /* NOTREACHED */ 317 return (FALSE); 318 } 319
Indexes created Tue Sep 30 11:09:46 GMT 2025