1 /* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *sccsid2 = "@(#)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 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * xdr_float.c, Generic XDR routines implementation. 43 * 44 * These are the "floating point" xdr routines used to (de)serialize 45 * most common data items. See xdr.h for more info on the interface to 46 * xdr. 47 */ 48 49 #include "namespace.h" 50 #include <sys/types.h> 51 #include <sys/param.h> 52 53 #include <stdio.h> 54 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 #include "un-namespace.h" 58 59 /* 60 * NB: Not portable. 61 * This routine works on machines with IEEE754 FP and Vaxen. 62 */ 63 64 #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \ 65 defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \ 66 defined(__arm__) || defined(__ppc__) || \ 67 defined(__arm26__) || defined(__sparc64__) || defined(__amd64__) || \ 68 defined(__aarch64__) 69 #include <machine/endian.h> 70 #define IEEEFP 71 #endif 72 73 #if defined(__vax__) 74 75 /* What IEEE single precision floating point looks like on a Vax */ 76 struct ieee_single { 77 unsigned int mantissa: 23; 78 unsigned int exp : 8; 79 unsigned int sign : 1; 80 }; 81 82 /* Vax single precision floating point */ 83 struct vax_single { 84 unsigned int mantissa1 : 7; 85 unsigned int exp : 8; 86 unsigned int sign : 1; 87 unsigned int mantissa2 : 16; 88 }; 89 90 #define VAX_SNG_BIAS 0x81 91 #define IEEE_SNG_BIAS 0x7f 92 93 static struct sgl_limits { 94 struct vax_single s; 95 struct ieee_single ieee; 96 } sgl_limits[2] = { 97 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 98 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 99 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 100 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 101 }; 102 #endif /* vax */ 103 104 bool_t 105 xdr_float(XDR *xdrs, float *fp) 106 { 107 #ifndef IEEEFP 108 struct ieee_single is; 109 struct vax_single vs, *vsp; 110 struct sgl_limits *lim; 111 int i; 112 #endif 113 switch (xdrs->x_op) { 114 115 case XDR_ENCODE: 116 #ifdef IEEEFP 117 return (XDR_PUTINT32(xdrs, (int32_t *)fp)); 118 #else 119 vs = *((struct vax_single *)fp); 120 for (i = 0, lim = sgl_limits; 121 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 122 i++, lim++) { 123 if ((vs.mantissa2 == lim->s.mantissa2) && 124 (vs.exp == lim->s.exp) && 125 (vs.mantissa1 == lim->s.mantissa1)) { 126 is = lim->ieee; 127 goto shipit; 128 } 129 } 130 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 131 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 132 shipit: 133 is.sign = vs.sign; 134 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 135 #endif 136 137 case XDR_DECODE: 138 #ifdef IEEEFP 139 return (XDR_GETINT32(xdrs, (int32_t *)fp)); 140 #else 141 vsp = (struct vax_single *)fp; 142 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 143 return (FALSE); 144 for (i = 0, lim = sgl_limits; 145 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 146 i++, lim++) { 147 if ((is.exp == lim->ieee.exp) && 148 (is.mantissa == lim->ieee.mantissa)) { 149 *vsp = lim->s; 150 goto doneit; 151 } 152 } 153 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 154 vsp->mantissa2 = is.mantissa; 155 vsp->mantissa1 = (is.mantissa >> 16); 156 doneit: 157 vsp->sign = is.sign; 158 return (TRUE); 159 #endif 160 161 case XDR_FREE: 162 return (TRUE); 163 } 164 /* NOTREACHED */ 165 return (FALSE); 166 } 167 168 #if defined(__vax__) 169 /* What IEEE double precision floating point looks like on a Vax */ 170 struct ieee_double { 171 unsigned int mantissa1 : 20; 172 unsigned int exp : 11; 173 unsigned int sign : 1; 174 unsigned int mantissa2 : 32; 175 }; 176 177 /* Vax double precision floating point */ 178 struct vax_double { 179 unsigned int mantissa1 : 7; 180 unsigned int exp : 8; 181 unsigned int sign : 1; 182 unsigned int mantissa2 : 16; 183 unsigned int mantissa3 : 16; 184 unsigned int mantissa4 : 16; 185 }; 186 187 #define VAX_DBL_BIAS 0x81 188 #define IEEE_DBL_BIAS 0x3ff 189 #define MASK(nbits) ((1 << nbits) - 1) 190 191 static struct dbl_limits { 192 struct vax_double d; 193 struct ieee_double ieee; 194 } dbl_limits[2] = { 195 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 196 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 197 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 198 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 199 }; 200 201 #endif /* vax */ 202 203 204 bool_t 205 xdr_double(XDR *xdrs, double *dp) 206 { 207 #ifdef IEEEFP 208 int32_t *i32p; 209 bool_t rv; 210 #else 211 int32_t *lp; 212 struct ieee_double id; 213 struct vax_double vd; 214 struct dbl_limits *lim; 215 int i; 216 #endif 217 218 switch (xdrs->x_op) { 219 220 case XDR_ENCODE: 221 #ifdef IEEEFP 222 i32p = (int32_t *)(void *)dp; 223 #if BYTE_ORDER == BIG_ENDIAN 224 rv = XDR_PUTINT32(xdrs, i32p); 225 if (!rv) 226 return (rv); 227 rv = XDR_PUTINT32(xdrs, i32p+1); 228 #else 229 rv = XDR_PUTINT32(xdrs, i32p+1); 230 if (!rv) 231 return (rv); 232 rv = XDR_PUTINT32(xdrs, i32p); 233 #endif 234 return (rv); 235 #else 236 vd = *((struct vax_double *)dp); 237 for (i = 0, lim = dbl_limits; 238 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 239 i++, lim++) { 240 if ((vd.mantissa4 == lim->d.mantissa4) && 241 (vd.mantissa3 == lim->d.mantissa3) && 242 (vd.mantissa2 == lim->d.mantissa2) && 243 (vd.mantissa1 == lim->d.mantissa1) && 244 (vd.exp == lim->d.exp)) { 245 id = lim->ieee; 246 goto shipit; 247 } 248 } 249 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 250 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 251 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 252 (vd.mantissa3 << 13) | 253 ((vd.mantissa4 >> 3) & MASK(13)); 254 shipit: 255 id.sign = vd.sign; 256 lp = (int32_t *)&id; 257 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 258 #endif 259 260 case XDR_DECODE: 261 #ifdef IEEEFP 262 i32p = (int32_t *)(void *)dp; 263 #if BYTE_ORDER == BIG_ENDIAN 264 rv = XDR_GETINT32(xdrs, i32p); 265 if (!rv) 266 return (rv); 267 rv = XDR_GETINT32(xdrs, i32p+1); 268 #else 269 rv = XDR_GETINT32(xdrs, i32p+1); 270 if (!rv) 271 return (rv); 272 rv = XDR_GETINT32(xdrs, i32p); 273 #endif 274 return (rv); 275 #else 276 lp = (int32_t *)&id; 277 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 278 return (FALSE); 279 for (i = 0, lim = dbl_limits; 280 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 281 i++, lim++) { 282 if ((id.mantissa2 == lim->ieee.mantissa2) && 283 (id.mantissa1 == lim->ieee.mantissa1) && 284 (id.exp == lim->ieee.exp)) { 285 vd = lim->d; 286 goto doneit; 287 } 288 } 289 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 290 vd.mantissa1 = (id.mantissa1 >> 13); 291 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 292 (id.mantissa2 >> 29); 293 vd.mantissa3 = (id.mantissa2 >> 13); 294 vd.mantissa4 = (id.mantissa2 << 3); 295 doneit: 296 vd.sign = id.sign; 297 *dp = *((double *)&vd); 298 return (TRUE); 299 #endif 300 301 case XDR_FREE: 302 return (TRUE); 303 } 304 /* NOTREACHED */ 305 return (FALSE); 306 } 307