xdr_float.c revision 1.35.8.1
1 /* $NetBSD: xdr_float.c,v 1.35.8.1 2013/03/14 22:03:15 riz 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 1.35.8.1 2013/03/14 22:03:15 riz 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(xdrs, fp) 115 XDR *xdrs; 116 float *fp; 117 { 118 #ifndef IEEEFP 119 struct ieee_single is; 120 struct vax_single vs, *vsp; 121 struct sgl_limits *lim; 122 size_t i; 123 #endif 124 switch (xdrs->x_op) { 125 126 case XDR_ENCODE: 127 #ifdef IEEEFP 128 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)fp)); 129 #else 130 vs = *((struct vax_single *)fp); 131 for (i = 0, lim = sgl_limits; 132 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 133 i++, lim++) { 134 if ((vs.mantissa2 == lim->s.mantissa2) && 135 (vs.exp == lim->s.exp) && 136 (vs.mantissa1 == lim->s.mantissa1)) { 137 is = lim->ieee; 138 goto shipit; 139 } 140 } 141 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 142 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 143 shipit: 144 is.sign = vs.sign; 145 return (XDR_PUTINT32(xdrs, (int32_t *)(void *)&is)); 146 #endif 147 148 case XDR_DECODE: 149 #ifdef IEEEFP 150 return (XDR_GETINT32(xdrs, (int32_t *)(void *)fp)); 151 #else 152 vsp = (struct vax_single *)fp; 153 if (!XDR_GETINT32(xdrs, (int32_t *)(void *)&is)) 154 return (FALSE); 155 for (i = 0, lim = sgl_limits; 156 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 157 i++, lim++) { 158 if ((is.exp == lim->ieee.exp) && 159 (is.mantissa == lim->ieee.mantissa)) { 160 *vsp = lim->s; 161 goto doneit; 162 } 163 } 164 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 165 vsp->mantissa2 = is.mantissa; 166 vsp->mantissa1 = (is.mantissa >> 16); 167 doneit: 168 vsp->sign = is.sign; 169 return (TRUE); 170 #endif 171 172 case XDR_FREE: 173 return (TRUE); 174 } 175 /* NOTREACHED */ 176 return (FALSE); 177 } 178 179 #if defined(__vax__) 180 /* What IEEE double precision floating point looks like on a Vax */ 181 struct ieee_double { 182 unsigned int mantissa1 : 20; 183 unsigned int exp : 11; 184 unsigned int sign : 1; 185 unsigned int mantissa2 : 32; 186 }; 187 188 /* Vax double precision floating point */ 189 struct vax_double { 190 unsigned int mantissa1 : 7; 191 unsigned int exp : 8; 192 unsigned int sign : 1; 193 unsigned int mantissa2 : 16; 194 unsigned int mantissa3 : 16; 195 unsigned int mantissa4 : 16; 196 }; 197 198 #define VAX_DBL_BIAS 0x81 199 #define IEEE_DBL_BIAS 0x3ff 200 #define MASK(nbits) ((1 << nbits) - 1) 201 202 static struct dbl_limits { 203 struct vax_double d; 204 struct ieee_double ieee; 205 } dbl_limits[2] = { 206 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 207 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 208 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 209 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 210 }; 211 212 #endif /* vax */ 213 214 215 bool_t 216 xdr_double(xdrs, dp) 217 XDR *xdrs; 218 double *dp; 219 { 220 #ifdef IEEEFP 221 int32_t *i32p; 222 bool_t rv; 223 #else 224 int32_t *lp; 225 struct ieee_double id; 226 struct vax_double vd; 227 struct dbl_limits *lim; 228 size_t i; 229 #endif 230 231 switch (xdrs->x_op) { 232 233 case XDR_ENCODE: 234 #ifdef IEEEFP 235 i32p = (int32_t *)(void *)dp; 236 #if (BYTE_ORDER == BIG_ENDIAN) || \ 237 (defined(__arm__) && !defined(__VFP_FP__)) 238 rv = XDR_PUTINT32(xdrs, i32p); 239 if (!rv) 240 return (rv); 241 rv = XDR_PUTINT32(xdrs, i32p+1); 242 #else 243 rv = XDR_PUTINT32(xdrs, i32p+1); 244 if (!rv) 245 return (rv); 246 rv = XDR_PUTINT32(xdrs, i32p); 247 #endif 248 return (rv); 249 #else 250 vd = *((struct vax_double *)dp); 251 for (i = 0, lim = dbl_limits; 252 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 253 i++, lim++) { 254 if ((vd.mantissa4 == lim->d.mantissa4) && 255 (vd.mantissa3 == lim->d.mantissa3) && 256 (vd.mantissa2 == lim->d.mantissa2) && 257 (vd.mantissa1 == lim->d.mantissa1) && 258 (vd.exp == lim->d.exp)) { 259 id = lim->ieee; 260 goto shipit; 261 } 262 } 263 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 264 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 265 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 266 (vd.mantissa3 << 13) | 267 ((vd.mantissa4 >> 3) & MASK(13)); 268 shipit: 269 id.sign = vd.sign; 270 lp = (int32_t *)(void *)&id; 271 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 272 #endif 273 274 case XDR_DECODE: 275 #ifdef IEEEFP 276 i32p = (int32_t *)(void *)dp; 277 #if BYTE_ORDER == BIG_ENDIAN || \ 278 (defined(__arm__) && !defined(__VFP_FP__)) 279 rv = XDR_GETINT32(xdrs, i32p); 280 if (!rv) 281 return (rv); 282 rv = XDR_GETINT32(xdrs, i32p+1); 283 #else 284 rv = XDR_GETINT32(xdrs, i32p+1); 285 if (!rv) 286 return (rv); 287 rv = XDR_GETINT32(xdrs, i32p); 288 #endif 289 return (rv); 290 #else 291 lp = (int32_t *)(void *)&id; 292 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 293 return (FALSE); 294 for (i = 0, lim = dbl_limits; 295 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 296 i++, lim++) { 297 if ((id.mantissa2 == lim->ieee.mantissa2) && 298 (id.mantissa1 == lim->ieee.mantissa1) && 299 (id.exp == lim->ieee.exp)) { 300 vd = lim->d; 301 goto doneit; 302 } 303 } 304 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 305 vd.mantissa1 = (id.mantissa1 >> 13); 306 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 307 (id.mantissa2 >> 29); 308 vd.mantissa3 = (id.mantissa2 >> 13); 309 vd.mantissa4 = (id.mantissa2 << 3); 310 doneit: 311 vd.sign = id.sign; 312 *dp = *((double *)(void *)&vd); 313 return (TRUE); 314 #endif 315 316 case XDR_FREE: 317 return (TRUE); 318 } 319 /* NOTREACHED */ 320 return (FALSE); 321 } 322
Indexes created Tue Sep 30 11:09:46 GMT 2025