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xdr_float.c revision 1.10.2.1
      1  1.10.2.1   jtc /*	$NetBSD: xdr_float.c,v 1.10.2.1 1996/09/16 23:44:44 jtc Exp $	*/
      2       1.6   cgd 
      3       1.1   cgd /*
      4       1.1   cgd  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
      5       1.1   cgd  * unrestricted use provided that this legend is included on all tape
      6       1.1   cgd  * media and as a part of the software program in whole or part.  Users
      7       1.1   cgd  * may copy or modify Sun RPC without charge, but are not authorized
      8       1.1   cgd  * to license or distribute it to anyone else except as part of a product or
      9       1.1   cgd  * program developed by the user.
     10       1.1   cgd  *
     11       1.1   cgd  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
     12       1.1   cgd  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
     13       1.1   cgd  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
     14       1.1   cgd  *
     15       1.1   cgd  * Sun RPC is provided with no support and without any obligation on the
     16       1.1   cgd  * part of Sun Microsystems, Inc. to assist in its use, correction,
     17       1.1   cgd  * modification or enhancement.
     18       1.1   cgd  *
     19       1.1   cgd  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
     20       1.1   cgd  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
     21       1.1   cgd  * OR ANY PART THEREOF.
     22       1.1   cgd  *
     23       1.1   cgd  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
     24       1.1   cgd  * or profits or other special, indirect and consequential damages, even if
     25       1.1   cgd  * Sun has been advised of the possibility of such damages.
     26       1.1   cgd  *
     27       1.1   cgd  * Sun Microsystems, Inc.
     28       1.1   cgd  * 2550 Garcia Avenue
     29       1.1   cgd  * Mountain View, California  94043
     30       1.1   cgd  */
     31       1.1   cgd 
     32       1.1   cgd #if defined(LIBC_SCCS) && !defined(lint)
     33       1.1   cgd /*static char *sccsid = "from: @(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";*/
     34       1.1   cgd /*static char *sccsid = "from: @(#)xdr_float.c	2.1 88/07/29 4.0 RPCSRC";*/
     35  1.10.2.1   jtc static char *rcsid = "$NetBSD: xdr_float.c,v 1.10.2.1 1996/09/16 23:44:44 jtc Exp $";
     36       1.1   cgd #endif
     37       1.1   cgd 
     38       1.1   cgd /*
     39       1.1   cgd  * xdr_float.c, Generic XDR routines impelmentation.
     40       1.1   cgd  *
     41       1.1   cgd  * Copyright (C) 1984, Sun Microsystems, Inc.
     42       1.1   cgd  *
     43       1.1   cgd  * These are the "floating point" xdr routines used to (de)serialize
     44       1.1   cgd  * most common data items.  See xdr.h for more info on the interface to
     45       1.1   cgd  * xdr.
     46       1.1   cgd  */
     47       1.1   cgd 
     48  1.10.2.1   jtc #include "namespace.h"
     49       1.1   cgd #include <stdio.h>
     50       1.1   cgd #include <sys/types.h>
     51       1.1   cgd #include <sys/param.h>
     52       1.1   cgd #include <rpc/types.h>
     53       1.1   cgd #include <rpc/xdr.h>
     54  1.10.2.1   jtc 
     55  1.10.2.1   jtc #ifdef __weak_alias
     56  1.10.2.1   jtc __weak_alias(xdr_double,_xdr_double);
     57  1.10.2.1   jtc __weak_alias(xdr_float,_xdr_float);
     58  1.10.2.1   jtc #endif
     59       1.1   cgd 
     60       1.1   cgd /*
     61       1.1   cgd  * NB: Not portable.
     62       1.7   jtc  * This routine works on machines with IEEE754 FP and Vaxen.
     63       1.1   cgd  */
     64       1.1   cgd 
     65       1.5   cgd #if defined(__m68k__) || defined(__sparc__) || defined(__i386__) || \
     66      1.10  mark     defined(__mips__) || defined(__ns32k__) || defined(__alpha__) || \
     67      1.10  mark     defined(__arm32__)
     68       1.7   jtc #include <machine/endian.h>
     69       1.1   cgd #define IEEEFP
     70       1.1   cgd #endif
     71       1.1   cgd 
     72       1.1   cgd #ifdef vax
     73       1.1   cgd 
     74       1.1   cgd /* What IEEE single precision floating point looks like on a Vax */
     75       1.1   cgd struct	ieee_single {
     76       1.1   cgd 	unsigned int	mantissa: 23;
     77       1.1   cgd 	unsigned int	exp     : 8;
     78       1.1   cgd 	unsigned int	sign    : 1;
     79       1.1   cgd };
     80       1.1   cgd 
     81       1.1   cgd /* Vax single precision floating point */
     82       1.1   cgd struct	vax_single {
     83       1.1   cgd 	unsigned int	mantissa1 : 7;
     84       1.1   cgd 	unsigned int	exp       : 8;
     85       1.1   cgd 	unsigned int	sign      : 1;
     86       1.1   cgd 	unsigned int	mantissa2 : 16;
     87       1.1   cgd };
     88       1.1   cgd 
     89       1.1   cgd #define VAX_SNG_BIAS	0x81
     90       1.1   cgd #define IEEE_SNG_BIAS	0x7f
     91       1.1   cgd 
     92       1.1   cgd static struct sgl_limits {
     93       1.1   cgd 	struct vax_single s;
     94       1.1   cgd 	struct ieee_single ieee;
     95       1.1   cgd } sgl_limits[2] = {
     96       1.1   cgd 	{{ 0x7f, 0xff, 0x0, 0xffff },	/* Max Vax */
     97       1.1   cgd 	{ 0x0, 0xff, 0x0 }},		/* Max IEEE */
     98       1.1   cgd 	{{ 0x0, 0x0, 0x0, 0x0 },	/* Min Vax */
     99       1.1   cgd 	{ 0x0, 0x0, 0x0 }}		/* Min IEEE */
    100       1.1   cgd };
    101       1.1   cgd #endif /* vax */
    102       1.1   cgd 
    103       1.1   cgd bool_t
    104       1.1   cgd xdr_float(xdrs, fp)
    105       1.1   cgd 	register XDR *xdrs;
    106       1.1   cgd 	register float *fp;
    107       1.1   cgd {
    108       1.4   cgd #ifdef IEEEFP
    109       1.4   cgd 	bool_t rv;
    110       1.4   cgd 	long tmpl;
    111       1.4   cgd #else
    112       1.1   cgd 	struct ieee_single is;
    113       1.1   cgd 	struct vax_single vs, *vsp;
    114       1.1   cgd 	struct sgl_limits *lim;
    115       1.1   cgd 	int i;
    116       1.1   cgd #endif
    117       1.1   cgd 	switch (xdrs->x_op) {
    118       1.1   cgd 
    119       1.1   cgd 	case XDR_ENCODE:
    120       1.1   cgd #ifdef IEEEFP
    121       1.4   cgd 		tmpl = *(int32_t *)fp;
    122       1.4   cgd 		return (XDR_PUTLONG(xdrs, &tmpl));
    123       1.1   cgd #else
    124       1.1   cgd 		vs = *((struct vax_single *)fp);
    125       1.1   cgd 		for (i = 0, lim = sgl_limits;
    126       1.1   cgd 			i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
    127       1.1   cgd 			i++, lim++) {
    128       1.1   cgd 			if ((vs.mantissa2 == lim->s.mantissa2) &&
    129       1.1   cgd 				(vs.exp == lim->s.exp) &&
    130       1.1   cgd 				(vs.mantissa1 == lim->s.mantissa1)) {
    131       1.1   cgd 				is = lim->ieee;
    132       1.1   cgd 				goto shipit;
    133       1.1   cgd 			}
    134       1.1   cgd 		}
    135       1.1   cgd 		is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
    136       1.1   cgd 		is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
    137       1.1   cgd 	shipit:
    138       1.1   cgd 		is.sign = vs.sign;
    139       1.1   cgd 		return (XDR_PUTLONG(xdrs, (long *)&is));
    140       1.1   cgd #endif
    141       1.1   cgd 
    142       1.1   cgd 	case XDR_DECODE:
    143       1.1   cgd #ifdef IEEEFP
    144       1.4   cgd 		rv = XDR_GETLONG(xdrs, &tmpl);
    145       1.4   cgd 		*(int32_t *)fp = tmpl;
    146       1.4   cgd 		return (rv);
    147       1.1   cgd #else
    148       1.1   cgd 		vsp = (struct vax_single *)fp;
    149       1.1   cgd 		if (!XDR_GETLONG(xdrs, (long *)&is))
    150       1.1   cgd 			return (FALSE);
    151       1.1   cgd 		for (i = 0, lim = sgl_limits;
    152       1.1   cgd 			i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
    153       1.1   cgd 			i++, lim++) {
    154       1.1   cgd 			if ((is.exp == lim->ieee.exp) &&
    155       1.1   cgd 				(is.mantissa == lim->ieee.mantissa)) {
    156       1.1   cgd 				*vsp = lim->s;
    157       1.1   cgd 				goto doneit;
    158       1.1   cgd 			}
    159       1.1   cgd 		}
    160       1.1   cgd 		vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
    161       1.1   cgd 		vsp->mantissa2 = is.mantissa;
    162       1.1   cgd 		vsp->mantissa1 = (is.mantissa >> 16);
    163       1.1   cgd 	doneit:
    164       1.1   cgd 		vsp->sign = is.sign;
    165       1.1   cgd 		return (TRUE);
    166       1.1   cgd #endif
    167       1.1   cgd 
    168       1.1   cgd 	case XDR_FREE:
    169       1.1   cgd 		return (TRUE);
    170       1.1   cgd 	}
    171       1.1   cgd 	return (FALSE);
    172       1.1   cgd }
    173       1.1   cgd 
    174       1.1   cgd #ifdef vax
    175       1.1   cgd /* What IEEE double precision floating point looks like on a Vax */
    176       1.1   cgd struct	ieee_double {
    177       1.1   cgd 	unsigned int	mantissa1 : 20;
    178       1.1   cgd 	unsigned int	exp       : 11;
    179       1.1   cgd 	unsigned int	sign      : 1;
    180       1.1   cgd 	unsigned int	mantissa2 : 32;
    181       1.1   cgd };
    182       1.1   cgd 
    183       1.1   cgd /* Vax double precision floating point */
    184       1.1   cgd struct  vax_double {
    185       1.1   cgd 	unsigned int	mantissa1 : 7;
    186       1.1   cgd 	unsigned int	exp       : 8;
    187       1.1   cgd 	unsigned int	sign      : 1;
    188       1.1   cgd 	unsigned int	mantissa2 : 16;
    189       1.1   cgd 	unsigned int	mantissa3 : 16;
    190       1.1   cgd 	unsigned int	mantissa4 : 16;
    191       1.1   cgd };
    192       1.1   cgd 
    193       1.1   cgd #define VAX_DBL_BIAS	0x81
    194       1.1   cgd #define IEEE_DBL_BIAS	0x3ff
    195       1.1   cgd #define MASK(nbits)	((1 << nbits) - 1)
    196       1.1   cgd 
    197       1.1   cgd static struct dbl_limits {
    198       1.1   cgd 	struct	vax_double d;
    199       1.1   cgd 	struct	ieee_double ieee;
    200       1.1   cgd } dbl_limits[2] = {
    201       1.1   cgd 	{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff },	/* Max Vax */
    202       1.1   cgd 	{ 0x0, 0x7ff, 0x0, 0x0 }},			/* Max IEEE */
    203       1.1   cgd 	{{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0},		/* Min Vax */
    204       1.1   cgd 	{ 0x0, 0x0, 0x0, 0x0 }}				/* Min IEEE */
    205       1.1   cgd };
    206       1.1   cgd 
    207       1.1   cgd #endif /* vax */
    208       1.1   cgd 
    209       1.1   cgd 
    210       1.1   cgd bool_t
    211       1.1   cgd xdr_double(xdrs, dp)
    212       1.1   cgd 	register XDR *xdrs;
    213       1.1   cgd 	double *dp;
    214       1.1   cgd {
    215       1.4   cgd #ifdef IEEEFP
    216       1.4   cgd 	register int32_t *i32p;
    217       1.4   cgd 	bool_t rv;
    218       1.4   cgd 	long tmpl;
    219       1.4   cgd #else
    220       1.1   cgd 	register long *lp;
    221       1.1   cgd 	struct	ieee_double id;
    222       1.1   cgd 	struct	vax_double vd;
    223       1.1   cgd 	register struct dbl_limits *lim;
    224       1.1   cgd 	int i;
    225       1.1   cgd #endif
    226       1.1   cgd 
    227       1.1   cgd 	switch (xdrs->x_op) {
    228       1.1   cgd 
    229       1.1   cgd 	case XDR_ENCODE:
    230       1.1   cgd #ifdef IEEEFP
    231       1.4   cgd 		i32p = (int32_t *)dp;
    232       1.1   cgd #if BYTE_ORDER == BIG_ENDIAN
    233       1.4   cgd 		tmpl = *i32p++;
    234       1.4   cgd 		rv = XDR_PUTLONG(xdrs, &tmpl);
    235       1.4   cgd 		if (!rv)
    236       1.4   cgd 			return (rv);
    237       1.4   cgd 		tmpl = *i32p;
    238       1.4   cgd 		rv = XDR_PUTLONG(xdrs, &tmpl);
    239       1.1   cgd #else
    240       1.9    pk 		tmpl = *(i32p+1);
    241       1.4   cgd 		rv = XDR_PUTLONG(xdrs, &tmpl);
    242       1.4   cgd 		if (!rv)
    243       1.4   cgd 			return (rv);
    244       1.4   cgd 		tmpl = *i32p;
    245       1.4   cgd 		rv = XDR_PUTLONG(xdrs, &tmpl);
    246       1.1   cgd #endif
    247       1.4   cgd 		return (rv);
    248       1.1   cgd #else
    249       1.1   cgd 		vd = *((struct vax_double *)dp);
    250       1.1   cgd 		for (i = 0, lim = dbl_limits;
    251       1.1   cgd 			i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
    252       1.1   cgd 			i++, lim++) {
    253       1.1   cgd 			if ((vd.mantissa4 == lim->d.mantissa4) &&
    254       1.1   cgd 				(vd.mantissa3 == lim->d.mantissa3) &&
    255       1.1   cgd 				(vd.mantissa2 == lim->d.mantissa2) &&
    256       1.1   cgd 				(vd.mantissa1 == lim->d.mantissa1) &&
    257       1.1   cgd 				(vd.exp == lim->d.exp)) {
    258       1.1   cgd 				id = lim->ieee;
    259       1.1   cgd 				goto shipit;
    260       1.1   cgd 			}
    261       1.1   cgd 		}
    262       1.1   cgd 		id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
    263       1.1   cgd 		id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
    264       1.1   cgd 		id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
    265       1.1   cgd 				(vd.mantissa3 << 13) |
    266       1.1   cgd 				((vd.mantissa4 >> 3) & MASK(13));
    267       1.1   cgd 	shipit:
    268       1.1   cgd 		id.sign = vd.sign;
    269       1.1   cgd 		lp = (long *)&id;
    270       1.1   cgd 		return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
    271       1.1   cgd #endif
    272       1.1   cgd 
    273       1.1   cgd 	case XDR_DECODE:
    274       1.1   cgd #ifdef IEEEFP
    275       1.4   cgd 		i32p = (int32_t *)dp;
    276       1.1   cgd #if BYTE_ORDER == BIG_ENDIAN
    277       1.4   cgd 		rv = XDR_GETLONG(xdrs, &tmpl);
    278       1.4   cgd 		*i32p++ = tmpl;
    279       1.4   cgd 		if (!rv)
    280       1.4   cgd 			return (rv);
    281       1.4   cgd 		rv = XDR_GETLONG(xdrs, &tmpl);
    282       1.4   cgd 		*i32p = tmpl;
    283       1.1   cgd #else
    284       1.4   cgd 		rv = XDR_GETLONG(xdrs, &tmpl);
    285       1.4   cgd 		*(i32p+1) = tmpl;
    286       1.4   cgd 		if (!rv)
    287       1.4   cgd 			return (rv);
    288       1.4   cgd 		rv = XDR_GETLONG(xdrs, &tmpl);
    289       1.4   cgd 		*i32p = tmpl;
    290       1.1   cgd #endif
    291       1.4   cgd 		return (rv);
    292       1.1   cgd #else
    293       1.1   cgd 		lp = (long *)&id;
    294       1.1   cgd 		if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
    295       1.1   cgd 			return (FALSE);
    296       1.1   cgd 		for (i = 0, lim = dbl_limits;
    297       1.1   cgd 			i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
    298       1.1   cgd 			i++, lim++) {
    299       1.1   cgd 			if ((id.mantissa2 == lim->ieee.mantissa2) &&
    300       1.1   cgd 				(id.mantissa1 == lim->ieee.mantissa1) &&
    301       1.1   cgd 				(id.exp == lim->ieee.exp)) {
    302       1.1   cgd 				vd = lim->d;
    303       1.1   cgd 				goto doneit;
    304       1.1   cgd 			}
    305       1.1   cgd 		}
    306       1.1   cgd 		vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
    307       1.1   cgd 		vd.mantissa1 = (id.mantissa1 >> 13);
    308       1.1   cgd 		vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
    309       1.1   cgd 				(id.mantissa2 >> 29);
    310       1.1   cgd 		vd.mantissa3 = (id.mantissa2 >> 13);
    311       1.1   cgd 		vd.mantissa4 = (id.mantissa2 << 3);
    312       1.1   cgd 	doneit:
    313       1.1   cgd 		vd.sign = id.sign;
    314       1.1   cgd 		*dp = *((double *)&vd);
    315       1.1   cgd 		return (TRUE);
    316       1.1   cgd #endif
    317       1.1   cgd 
    318       1.1   cgd 	case XDR_FREE:
    319       1.1   cgd 		return (TRUE);
    320       1.1   cgd 	}
    321       1.1   cgd 	return (FALSE);
    322       1.1   cgd }
    323