1/* 2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights 7 * Reserved. This file contains Original Code and/or Modifications of 8 * Original Code as defined in and that are subject to the Apple Public 9 * Source License Version 1.1 (the "License"). You may not use this file 10 * except in compliance with the License. Please obtain a copy of the 11 * License at http://www.apple.com/publicsource and read it before using 12 * this file. 13 * 14 * The Original Code and all software distributed under the License are 15 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER 16 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the 19 * License for the specific language governing rights and limitations 20 * under the License. 21 * 22 * @APPLE_LICENSE_HEADER_END@ 23 */ 24 25/* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ */ 26 27/* 28 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 29 * unrestricted use provided that this legend is included on all tape 30 * media and as a part of the software program in whole or part. Users 31 * may copy or modify Sun RPC without charge, but are not authorized 32 * to license or distribute it to anyone else except as part of a product or 33 * program developed by the user. 34 * 35 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 36 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 37 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 38 * 39 * Sun RPC is provided with no support and without any obligation on the 40 * part of Sun Microsystems, Inc. to assist in its use, correction, 41 * modification or enhancement. 42 * 43 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 44 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 45 * OR ANY PART THEREOF. 46 * 47 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 48 * or profits or other special, indirect and consequential damages, even if 49 * Sun has been advised of the possibility of such damages. 50 * 51 * Sun Microsystems, Inc. 52 * 2550 Garcia Avenue 53 * Mountain View, California 94043 54 */ 55 56#if defined(LIBC_SCCS) && !defined(lint) 57static char *sccsid = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro"; 58static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC"; 59#endif 60#include <sys/cdefs.h> 61 62/* 63 * xdr_float.c, Generic XDR routines implementation. 64 * 65 * Copyright (C) 1984, Sun Microsystems, Inc. 66 * 67 * These are the "floating point" xdr routines used to (de)serialize 68 * most common data items. See xdr.h for more info on the interface to 69 * xdr. 70 */ 71 72#include <sys/types.h> 73#include <sys/param.h> 74 75#include <stdio.h> 76 77#include <rpc/types.h> 78#include <rpc/xdr.h> 79 80/* 81 * NB: Not portable. 82 * This routine works on machines with IEEE754 FP and Vaxen. 83 */ 84 85#if 1 /* Used to be long list of architectures */ 86#include <machine/endian.h> 87#define IEEEFP 88#endif 89 90#if defined(__vax__) 91 92/* What IEEE single precision floating point looks like on a Vax */ 93struct ieee_single { 94 unsigned int mantissa: 23; 95 unsigned int exp : 8; 96 unsigned int sign : 1; 97}; 98 99/* Vax single precision floating point */ 100struct vax_single { 101 unsigned int mantissa1 : 7; 102 unsigned int exp : 8; 103 unsigned int sign : 1; 104 unsigned int mantissa2 : 16; 105}; 106 107#define VAX_SNG_BIAS 0x81 108#define IEEE_SNG_BIAS 0x7f 109 110static struct sgl_limits { 111 struct vax_single s; 112 struct ieee_single ieee; 113} sgl_limits[2] = { 114 {{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */ 115 { 0x0, 0xff, 0x0 }}, /* Max IEEE */ 116 {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */ 117 { 0x0, 0x0, 0x0 }} /* Min IEEE */ 118}; 119#endif /* vax */ 120 121bool_t 122xdr_float(xdrs, fp) 123 XDR *xdrs; 124 float *fp; 125{ 126#ifndef IEEEFP 127 struct ieee_single is; 128 struct vax_single vs, *vsp; 129 struct sgl_limits *lim; 130 int i; 131#endif 132 switch (xdrs->x_op) { 133 134 case XDR_ENCODE: 135#ifdef IEEEFP 136 return (XDR_PUTINT32(xdrs, (int32_t *)fp)); 137#else 138 vs = *((struct vax_single *)fp); 139 for (i = 0, lim = sgl_limits; 140 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 141 i++, lim++) { 142 if ((vs.mantissa2 == lim->s.mantissa2) && 143 (vs.exp == lim->s.exp) && 144 (vs.mantissa1 == lim->s.mantissa1)) { 145 is = lim->ieee; 146 goto shipit; 147 } 148 } 149 is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS; 150 is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2; 151 shipit: 152 is.sign = vs.sign; 153 return (XDR_PUTINT32(xdrs, (int32_t *)&is)); 154#endif 155 156 case XDR_DECODE: 157#ifdef IEEEFP 158 return (XDR_GETINT32(xdrs, (int32_t *)fp)); 159#else 160 vsp = (struct vax_single *)fp; 161 if (!XDR_GETINT32(xdrs, (int32_t *)&is)) 162 return (FALSE); 163 for (i = 0, lim = sgl_limits; 164 i < sizeof(sgl_limits)/sizeof(struct sgl_limits); 165 i++, lim++) { 166 if ((is.exp == lim->ieee.exp) && 167 (is.mantissa == lim->ieee.mantissa)) { 168 *vsp = lim->s; 169 goto doneit; 170 } 171 } 172 vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS; 173 vsp->mantissa2 = is.mantissa; 174 vsp->mantissa1 = (is.mantissa >> 16); 175 doneit: 176 vsp->sign = is.sign; 177 return (TRUE); 178#endif 179 180 case XDR_FREE: 181 return (TRUE); 182 } 183 /* NOTREACHED */ 184 return (FALSE); 185} 186 187#if defined(__vax__) 188/* What IEEE double precision floating point looks like on a Vax */ 189struct ieee_double { 190 unsigned int mantissa1 : 20; 191 unsigned int exp : 11; 192 unsigned int sign : 1; 193 unsigned int mantissa2 : 32; 194}; 195 196/* Vax double precision floating point */ 197struct vax_double { 198 unsigned int mantissa1 : 7; 199 unsigned int exp : 8; 200 unsigned int sign : 1; 201 unsigned int mantissa2 : 16; 202 unsigned int mantissa3 : 16; 203 unsigned int mantissa4 : 16; 204}; 205 206#define VAX_DBL_BIAS 0x81 207#define IEEE_DBL_BIAS 0x3ff 208#define MASK(nbits) ((1 << nbits) - 1) 209 210static struct dbl_limits { 211 struct vax_double d; 212 struct ieee_double ieee; 213} dbl_limits[2] = { 214 {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */ 215 { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */ 216 {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */ 217 { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */ 218}; 219 220#endif /* vax */ 221 222 223bool_t 224xdr_double(xdrs, dp) 225 XDR *xdrs; 226 double *dp; 227{ 228#ifdef IEEEFP 229 int32_t *i32p; 230 bool_t rv; 231#else 232 int32_t *lp; 233 struct ieee_double id; 234 struct vax_double vd; 235 struct dbl_limits *lim; 236 int i; 237#endif 238 239 switch (xdrs->x_op) { 240 241 case XDR_ENCODE: 242#ifdef IEEEFP 243 i32p = (int32_t *)(void *)dp; 244#if BYTE_ORDER == BIG_ENDIAN 245 rv = XDR_PUTINT32(xdrs, i32p); 246 if (!rv) 247 return (rv); 248 rv = XDR_PUTINT32(xdrs, i32p+1); 249#else 250 rv = XDR_PUTINT32(xdrs, i32p+1); 251 if (!rv) 252 return (rv); 253 rv = XDR_PUTINT32(xdrs, i32p); 254#endif 255 return (rv); 256#else 257 vd = *((struct vax_double *)dp); 258 for (i = 0, lim = dbl_limits; 259 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 260 i++, lim++) { 261 if ((vd.mantissa4 == lim->d.mantissa4) && 262 (vd.mantissa3 == lim->d.mantissa3) && 263 (vd.mantissa2 == lim->d.mantissa2) && 264 (vd.mantissa1 == lim->d.mantissa1) && 265 (vd.exp == lim->d.exp)) { 266 id = lim->ieee; 267 goto shipit; 268 } 269 } 270 id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS; 271 id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3); 272 id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) | 273 (vd.mantissa3 << 13) | 274 ((vd.mantissa4 >> 3) & MASK(13)); 275 shipit: 276 id.sign = vd.sign; 277 lp = (int32_t *)&id; 278 return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp)); 279#endif 280 281 case XDR_DECODE: 282#ifdef IEEEFP 283 i32p = (int32_t *)(void *)dp; 284#if BYTE_ORDER == BIG_ENDIAN 285 rv = XDR_GETINT32(xdrs, i32p); 286 if (!rv) 287 return (rv); 288 rv = XDR_GETINT32(xdrs, i32p+1); 289#else 290 rv = XDR_GETINT32(xdrs, i32p+1); 291 if (!rv) 292 return (rv); 293 rv = XDR_GETINT32(xdrs, i32p); 294#endif 295 return (rv); 296#else 297 lp = (int32_t *)&id; 298 if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp)) 299 return (FALSE); 300 for (i = 0, lim = dbl_limits; 301 i < sizeof(dbl_limits)/sizeof(struct dbl_limits); 302 i++, lim++) { 303 if ((id.mantissa2 == lim->ieee.mantissa2) && 304 (id.mantissa1 == lim->ieee.mantissa1) && 305 (id.exp == lim->ieee.exp)) { 306 vd = lim->d; 307 goto doneit; 308 } 309 } 310 vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS; 311 vd.mantissa1 = (id.mantissa1 >> 13); 312 vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) | 313 (id.mantissa2 >> 29); 314 vd.mantissa3 = (id.mantissa2 >> 13); 315 vd.mantissa4 = (id.mantissa2 << 3); 316 doneit: 317 vd.sign = id.sign; 318 *dp = *((double *)&vd); 319 return (TRUE); 320#endif 321 322 case XDR_FREE: 323 return (TRUE); 324 } 325 /* NOTREACHED */ 326 return (FALSE); 327} 328