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