1 /* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2010, Oracle America, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions are 10 * met: 11 * 12 * * Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * * Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials 17 * provided with the distribution. 18 * * Neither the name of the "Oracle America, Inc." nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 29 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * xdr_float.c, Generic XDR routines implementation. 38 * 39 * These are the "floating point" xdr routines used to (de)serialize 40 * most common data items. See xdr.h for more info on the interface to 41 * xdr. 42 */ 43 44 #include "namespace.h" 45 #include <sys/param.h> 46 47 #include <stdio.h> 48 49 #include <rpc/types.h> 50 #include <rpc/xdr.h> 51 #include "un-namespace.h" 52 53 /* 54 * NB: Not portable. 55 * This routine works on machines with IEEE754 FP and Vaxen. 56 */ 57 58 #include <machine/endian.h> 59 #define IEEEFP 60 61 #if defined(__vax__) 62 63 /* What IEEE single precision floating point looks like on a Vax */ 64 struct ieee_single { 65 unsigned int mantissa: 23; 66 unsigned int exp : 8; 67 unsigned int sign : 1; 68 }; 69 70 /* Vax single precision floating point */ 71 struct vax_single { 72 unsigned int mantissa1 : 7; 73 unsigned int exp : 8; 74 unsigned int sign : 1; 75 unsigned int mantissa2 : 16; 76 }; 77 78 #define VAX_SNG_BIAS 0x81 79 #define IEEE_SNG_BIAS 0x7f 80 81 static struct sgl_limits { 82 struct vax_single s; 83 struct ieee_single ieee; 84 } sgl_limits[2] = { 85 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 86 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 87 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 88 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 89 }; 90 #endif /* vax */ 91 92 bool_t 93 xdr_float(XDR *xdrs, float *fp) 94 { 95 #ifndef IEEEFP 96 struct ieee_single is; 97 struct vax_single vs, *vsp; 98 struct sgl_limits *lim; 99 u_int i; 100 #endif 101 switch (xdrs->x_op) { 102 103 case XDR_ENCODE: 104 #ifdef IEEEFP 105 return (XDR_PUTINT32(xdrs, (int32_t *)fp)); 106 #else 107 vs = *((struct vax_single *)fp); 108 for (i = 0, lim = sgl_limits; i < nitems(sgl_limits); 109 i++, lim++) { 110 if ((vs.mantissa2 == lim->s.mantissa2) && 111 (vs.exp == lim->s.exp) && 112 (vs.mantissa1 == lim->s.mantissa1)) { 113 is = lim->ieee; 114 goto shipit; 115 } 116 } 117 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 118 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 119 shipit: 120 is.sign = vs.sign; 121 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 122 #endif 123 124 case XDR_DECODE: 125 #ifdef IEEEFP 126 return (XDR_GETINT32(xdrs, (int32_t *)fp)); 127 #else 128 vsp = (struct vax_single *)fp; 129 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 130 return (FALSE); 131 for (i = 0, lim = sgl_limits; i < nitems(sgl_limits); 132 i++, lim++) { 133 if ((is.exp == lim->ieee.exp) && 134 (is.mantissa == lim->ieee.mantissa)) { 135 *vsp = lim->s; 136 goto doneit; 137 } 138 } 139 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 140 vsp->mantissa2 = is.mantissa; 141 vsp->mantissa1 = (is.mantissa >> 16); 142 doneit: 143 vsp->sign = is.sign; 144 return (TRUE); 145 #endif 146 147 case XDR_FREE: 148 return (TRUE); 149 } 150 /* NOTREACHED */ 151 return (FALSE); 152 } 153 154 #if defined(__vax__) 155 /* What IEEE double precision floating point looks like on a Vax */ 156 struct ieee_double { 157 unsigned int mantissa1 : 20; 158 unsigned int exp : 11; 159 unsigned int sign : 1; 160 unsigned int mantissa2 : 32; 161 }; 162 163 /* Vax double precision floating point */ 164 struct vax_double { 165 unsigned int mantissa1 : 7; 166 unsigned int exp : 8; 167 unsigned int sign : 1; 168 unsigned int mantissa2 : 16; 169 unsigned int mantissa3 : 16; 170 unsigned int mantissa4 : 16; 171 }; 172 173 #define VAX_DBL_BIAS 0x81 174 #define IEEE_DBL_BIAS 0x3ff 175 #define MASK(nbits) ((1 << nbits) - 1) 176 177 static struct dbl_limits { 178 struct vax_double d; 179 struct ieee_double ieee; 180 } dbl_limits[2] = { 181 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 182 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 183 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 184 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 185 }; 186 187 #endif /* vax */ 188 189 190 bool_t 191 xdr_double(XDR *xdrs, double *dp) 192 { 193 #ifdef IEEEFP 194 int32_t *i32p; 195 bool_t rv; 196 #else 197 int32_t *lp; 198 struct ieee_double id; 199 struct vax_double vd; 200 struct dbl_limits *lim; 201 u_int i; 202 #endif 203 204 switch (xdrs->x_op) { 205 206 case XDR_ENCODE: 207 #ifdef IEEEFP 208 i32p = (int32_t *)(void *)dp; 209 #if BYTE_ORDER == BIG_ENDIAN 210 rv = XDR_PUTINT32(xdrs, i32p); 211 if (!rv) 212 return (rv); 213 rv = XDR_PUTINT32(xdrs, i32p+1); 214 #else 215 rv = XDR_PUTINT32(xdrs, i32p+1); 216 if (!rv) 217 return (rv); 218 rv = XDR_PUTINT32(xdrs, i32p); 219 #endif 220 return (rv); 221 #else 222 vd = *((struct vax_double *)dp); 223 for (i = 0, lim = dbl_limits; i < nitems(dbl_limits); 224 i++, lim++) { 225 if ((vd.mantissa4 == lim->d.mantissa4) && 226 (vd.mantissa3 == lim->d.mantissa3) && 227 (vd.mantissa2 == lim->d.mantissa2) && 228 (vd.mantissa1 == lim->d.mantissa1) && 229 (vd.exp == lim->d.exp)) { 230 id = lim->ieee; 231 goto shipit; 232 } 233 } 234 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 235 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 236 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 237 (vd.mantissa3 << 13) | 238 ((vd.mantissa4 >> 3) & MASK(13)); 239 shipit: 240 id.sign = vd.sign; 241 lp = (int32_t *)&id; 242 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 243 #endif 244 245 case XDR_DECODE: 246 #ifdef IEEEFP 247 i32p = (int32_t *)(void *)dp; 248 #if BYTE_ORDER == BIG_ENDIAN 249 rv = XDR_GETINT32(xdrs, i32p); 250 if (!rv) 251 return (rv); 252 rv = XDR_GETINT32(xdrs, i32p+1); 253 #else 254 rv = XDR_GETINT32(xdrs, i32p+1); 255 if (!rv) 256 return (rv); 257 rv = XDR_GETINT32(xdrs, i32p); 258 #endif 259 return (rv); 260 #else 261 lp = (int32_t *)&id; 262 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 263 return (FALSE); 264 for (i = 0, lim = dbl_limits; i < nitems(dbl_limits); 265 i++, lim++) { 266 if ((id.mantissa2 == lim->ieee.mantissa2) && 267 (id.mantissa1 == lim->ieee.mantissa1) && 268 (id.exp == lim->ieee.exp)) { 269 vd = lim->d; 270 goto doneit; 271 } 272 } 273 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 274 vd.mantissa1 = (id.mantissa1 >> 13); 275 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 276 (id.mantissa2 >> 29); 277 vd.mantissa3 = (id.mantissa2 >> 13); 278 vd.mantissa4 = (id.mantissa2 << 3); 279 doneit: 280 vd.sign = id.sign; 281 *dp = *((double *)&vd); 282 return (TRUE); 283 #endif 284 285 case XDR_FREE: 286 return (TRUE); 287 } 288 /* NOTREACHED */ 289 return (FALSE); 290 } 291