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 #include <machine/endian.h> 65 #define IEEEFP 66 67 #if defined(__vax__) 68 69 /* What IEEE single precision floating point looks like on a Vax */ 70 struct ieee_single { 71 unsigned int mantissa: 23; 72 unsigned int exp : 8; 73 unsigned int sign : 1; 74 }; 75 76 /* Vax single precision floating point */ 77 struct vax_single { 78 unsigned int mantissa1 : 7; 79 unsigned int exp : 8; 80 unsigned int sign : 1; 81 unsigned int mantissa2 : 16; 82 }; 83 84 #define VAX_SNG_BIAS 0x81 85 #define IEEE_SNG_BIAS 0x7f 86 87 static struct sgl_limits { 88 struct vax_single s; 89 struct ieee_single ieee; 90 } sgl_limits[2] = { 91 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 92 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 93 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 94 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 95 }; 96 #endif /* vax */ 97 98 bool_t 99 xdr_float(XDR *xdrs, float *fp) 100 { 101 #ifndef IEEEFP 102 struct ieee_single is; 103 struct vax_single vs, *vsp; 104 struct sgl_limits *lim; 105 int i; 106 #endif 107 switch (xdrs->x_op) { 108 109 case XDR_ENCODE: 110 #ifdef IEEEFP 111 return (XDR_PUTINT32(xdrs, (int32_t *)fp)); 112 #else 113 vs = *((struct vax_single *)fp); 114 for (i = 0, lim = sgl_limits; 115 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 116 i++, lim++) { 117 if ((vs.mantissa2 == lim->s.mantissa2) && 118 (vs.exp == lim->s.exp) && 119 (vs.mantissa1 == lim->s.mantissa1)) { 120 is = lim->ieee; 121 goto shipit; 122 } 123 } 124 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 125 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 126 shipit: 127 is.sign = vs.sign; 128 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 129 #endif 130 131 case XDR_DECODE: 132 #ifdef IEEEFP 133 return (XDR_GETINT32(xdrs, (int32_t *)fp)); 134 #else 135 vsp = (struct vax_single *)fp; 136 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 137 return (FALSE); 138 for (i = 0, lim = sgl_limits; 139 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 140 i++, lim++) { 141 if ((is.exp == lim->ieee.exp) && 142 (is.mantissa == lim->ieee.mantissa)) { 143 *vsp = lim->s; 144 goto doneit; 145 } 146 } 147 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 148 vsp->mantissa2 = is.mantissa; 149 vsp->mantissa1 = (is.mantissa >> 16); 150 doneit: 151 vsp->sign = is.sign; 152 return (TRUE); 153 #endif 154 155 case XDR_FREE: 156 return (TRUE); 157 } 158 /* NOTREACHED */ 159 return (FALSE); 160 } 161 162 #if defined(__vax__) 163 /* What IEEE double precision floating point looks like on a Vax */ 164 struct ieee_double { 165 unsigned int mantissa1 : 20; 166 unsigned int exp : 11; 167 unsigned int sign : 1; 168 unsigned int mantissa2 : 32; 169 }; 170 171 /* Vax double precision floating point */ 172 struct vax_double { 173 unsigned int mantissa1 : 7; 174 unsigned int exp : 8; 175 unsigned int sign : 1; 176 unsigned int mantissa2 : 16; 177 unsigned int mantissa3 : 16; 178 unsigned int mantissa4 : 16; 179 }; 180 181 #define VAX_DBL_BIAS 0x81 182 #define IEEE_DBL_BIAS 0x3ff 183 #define MASK(nbits) ((1 << nbits) - 1) 184 185 static struct dbl_limits { 186 struct vax_double d; 187 struct ieee_double ieee; 188 } dbl_limits[2] = { 189 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 190 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 191 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 192 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 193 }; 194 195 #endif /* vax */ 196 197 198 bool_t 199 xdr_double(XDR *xdrs, double *dp) 200 { 201 #ifdef IEEEFP 202 int32_t *i32p; 203 bool_t rv; 204 #else 205 int32_t *lp; 206 struct ieee_double id; 207 struct vax_double vd; 208 struct dbl_limits *lim; 209 int i; 210 #endif 211 212 switch (xdrs->x_op) { 213 214 case XDR_ENCODE: 215 #ifdef IEEEFP 216 i32p = (int32_t *)(void *)dp; 217 #if BYTE_ORDER == BIG_ENDIAN 218 rv = XDR_PUTINT32(xdrs, i32p); 219 if (!rv) 220 return (rv); 221 rv = XDR_PUTINT32(xdrs, i32p+1); 222 #else 223 rv = XDR_PUTINT32(xdrs, i32p+1); 224 if (!rv) 225 return (rv); 226 rv = XDR_PUTINT32(xdrs, i32p); 227 #endif 228 return (rv); 229 #else 230 vd = *((struct vax_double *)dp); 231 for (i = 0, lim = dbl_limits; 232 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 233 i++, lim++) { 234 if ((vd.mantissa4 == lim->d.mantissa4) && 235 (vd.mantissa3 == lim->d.mantissa3) && 236 (vd.mantissa2 == lim->d.mantissa2) && 237 (vd.mantissa1 == lim->d.mantissa1) && 238 (vd.exp == lim->d.exp)) { 239 id = lim->ieee; 240 goto shipit; 241 } 242 } 243 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 244 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 245 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 246 (vd.mantissa3 << 13) | 247 ((vd.mantissa4 >> 3) & MASK(13)); 248 shipit: 249 id.sign = vd.sign; 250 lp = (int32_t *)&id; 251 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 252 #endif 253 254 case XDR_DECODE: 255 #ifdef IEEEFP 256 i32p = (int32_t *)(void *)dp; 257 #if BYTE_ORDER == BIG_ENDIAN 258 rv = XDR_GETINT32(xdrs, i32p); 259 if (!rv) 260 return (rv); 261 rv = XDR_GETINT32(xdrs, i32p+1); 262 #else 263 rv = XDR_GETINT32(xdrs, i32p+1); 264 if (!rv) 265 return (rv); 266 rv = XDR_GETINT32(xdrs, i32p); 267 #endif 268 return (rv); 269 #else 270 lp = (int32_t *)&id; 271 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 272 return (FALSE); 273 for (i = 0, lim = dbl_limits; 274 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 275 i++, lim++) { 276 if ((id.mantissa2 == lim->ieee.mantissa2) && 277 (id.mantissa1 == lim->ieee.mantissa1) && 278 (id.exp == lim->ieee.exp)) { 279 vd = lim->d; 280 goto doneit; 281 } 282 } 283 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 284 vd.mantissa1 = (id.mantissa1 >> 13); 285 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 286 (id.mantissa2 >> 29); 287 vd.mantissa3 = (id.mantissa2 >> 13); 288 vd.mantissa4 = (id.mantissa2 << 3); 289 doneit: 290 vd.sign = id.sign; 291 *dp = *((double *)&vd); 292 return (TRUE); 293 #endif 294 295 case XDR_FREE: 296 return (TRUE); 297 } 298 /* NOTREACHED */ 299 return (FALSE); 300 } 301