0bb25b8d7b
Although usually small, values produced by nitems() are unsigned. Unsign inxdeing variables related to nitems() macros to avoid signed vs. unsigned comparisons.
296 lines
7.5 KiB
C
296 lines
7.5 KiB
C
/* $NetBSD: xdr_float.c,v 1.23 2000/07/17 04:59:51 matt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2010, Oracle America, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
* * Neither the name of the "Oracle America, Inc." nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
|
|
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
|
|
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char *sccsid2 = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
|
|
static char *sccsid = "@(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC";
|
|
#endif
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* xdr_float.c, Generic XDR routines implementation.
|
|
*
|
|
* These are the "floating point" xdr routines used to (de)serialize
|
|
* most common data items. See xdr.h for more info on the interface to
|
|
* xdr.
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include <sys/param.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <rpc/types.h>
|
|
#include <rpc/xdr.h>
|
|
#include "un-namespace.h"
|
|
|
|
/*
|
|
* NB: Not portable.
|
|
* This routine works on machines with IEEE754 FP and Vaxen.
|
|
*/
|
|
|
|
#include <machine/endian.h>
|
|
#define IEEEFP
|
|
|
|
#if defined(__vax__)
|
|
|
|
/* What IEEE single precision floating point looks like on a Vax */
|
|
struct ieee_single {
|
|
unsigned int mantissa: 23;
|
|
unsigned int exp : 8;
|
|
unsigned int sign : 1;
|
|
};
|
|
|
|
/* Vax single precision floating point */
|
|
struct vax_single {
|
|
unsigned int mantissa1 : 7;
|
|
unsigned int exp : 8;
|
|
unsigned int sign : 1;
|
|
unsigned int mantissa2 : 16;
|
|
};
|
|
|
|
#define VAX_SNG_BIAS 0x81
|
|
#define IEEE_SNG_BIAS 0x7f
|
|
|
|
static struct sgl_limits {
|
|
struct vax_single s;
|
|
struct ieee_single ieee;
|
|
} sgl_limits[2] = {
|
|
{{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
|
|
{ 0x0, 0xff, 0x0 }}, /* Max IEEE */
|
|
{{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
|
|
{ 0x0, 0x0, 0x0 }} /* Min IEEE */
|
|
};
|
|
#endif /* vax */
|
|
|
|
bool_t
|
|
xdr_float(XDR *xdrs, float *fp)
|
|
{
|
|
#ifndef IEEEFP
|
|
struct ieee_single is;
|
|
struct vax_single vs, *vsp;
|
|
struct sgl_limits *lim;
|
|
u_int i;
|
|
#endif
|
|
switch (xdrs->x_op) {
|
|
|
|
case XDR_ENCODE:
|
|
#ifdef IEEEFP
|
|
return (XDR_PUTINT32(xdrs, (int32_t *)fp));
|
|
#else
|
|
vs = *((struct vax_single *)fp);
|
|
for (i = 0, lim = sgl_limits; i < nitems(sgl_limits);
|
|
i++, lim++) {
|
|
if ((vs.mantissa2 == lim->s.mantissa2) &&
|
|
(vs.exp == lim->s.exp) &&
|
|
(vs.mantissa1 == lim->s.mantissa1)) {
|
|
is = lim->ieee;
|
|
goto shipit;
|
|
}
|
|
}
|
|
is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
|
|
is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
|
|
shipit:
|
|
is.sign = vs.sign;
|
|
return (XDR_PUTINT32(xdrs, (int32_t *)&is));
|
|
#endif
|
|
|
|
case XDR_DECODE:
|
|
#ifdef IEEEFP
|
|
return (XDR_GETINT32(xdrs, (int32_t *)fp));
|
|
#else
|
|
vsp = (struct vax_single *)fp;
|
|
if (!XDR_GETINT32(xdrs, (int32_t *)&is))
|
|
return (FALSE);
|
|
for (i = 0, lim = sgl_limits; i < nitems(sgl_limits);
|
|
i++, lim++) {
|
|
if ((is.exp == lim->ieee.exp) &&
|
|
(is.mantissa == lim->ieee.mantissa)) {
|
|
*vsp = lim->s;
|
|
goto doneit;
|
|
}
|
|
}
|
|
vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
|
|
vsp->mantissa2 = is.mantissa;
|
|
vsp->mantissa1 = (is.mantissa >> 16);
|
|
doneit:
|
|
vsp->sign = is.sign;
|
|
return (TRUE);
|
|
#endif
|
|
|
|
case XDR_FREE:
|
|
return (TRUE);
|
|
}
|
|
/* NOTREACHED */
|
|
return (FALSE);
|
|
}
|
|
|
|
#if defined(__vax__)
|
|
/* What IEEE double precision floating point looks like on a Vax */
|
|
struct ieee_double {
|
|
unsigned int mantissa1 : 20;
|
|
unsigned int exp : 11;
|
|
unsigned int sign : 1;
|
|
unsigned int mantissa2 : 32;
|
|
};
|
|
|
|
/* Vax double precision floating point */
|
|
struct vax_double {
|
|
unsigned int mantissa1 : 7;
|
|
unsigned int exp : 8;
|
|
unsigned int sign : 1;
|
|
unsigned int mantissa2 : 16;
|
|
unsigned int mantissa3 : 16;
|
|
unsigned int mantissa4 : 16;
|
|
};
|
|
|
|
#define VAX_DBL_BIAS 0x81
|
|
#define IEEE_DBL_BIAS 0x3ff
|
|
#define MASK(nbits) ((1 << nbits) - 1)
|
|
|
|
static struct dbl_limits {
|
|
struct vax_double d;
|
|
struct ieee_double ieee;
|
|
} dbl_limits[2] = {
|
|
{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
|
|
{ 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
|
|
{{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
|
|
{ 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
|
|
};
|
|
|
|
#endif /* vax */
|
|
|
|
|
|
bool_t
|
|
xdr_double(XDR *xdrs, double *dp)
|
|
{
|
|
#ifdef IEEEFP
|
|
int32_t *i32p;
|
|
bool_t rv;
|
|
#else
|
|
int32_t *lp;
|
|
struct ieee_double id;
|
|
struct vax_double vd;
|
|
struct dbl_limits *lim;
|
|
u_int i;
|
|
#endif
|
|
|
|
switch (xdrs->x_op) {
|
|
|
|
case XDR_ENCODE:
|
|
#ifdef IEEEFP
|
|
i32p = (int32_t *)(void *)dp;
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
rv = XDR_PUTINT32(xdrs, i32p);
|
|
if (!rv)
|
|
return (rv);
|
|
rv = XDR_PUTINT32(xdrs, i32p+1);
|
|
#else
|
|
rv = XDR_PUTINT32(xdrs, i32p+1);
|
|
if (!rv)
|
|
return (rv);
|
|
rv = XDR_PUTINT32(xdrs, i32p);
|
|
#endif
|
|
return (rv);
|
|
#else
|
|
vd = *((struct vax_double *)dp);
|
|
for (i = 0, lim = dbl_limits; i < nitems(dbl_limits);
|
|
i++, lim++) {
|
|
if ((vd.mantissa4 == lim->d.mantissa4) &&
|
|
(vd.mantissa3 == lim->d.mantissa3) &&
|
|
(vd.mantissa2 == lim->d.mantissa2) &&
|
|
(vd.mantissa1 == lim->d.mantissa1) &&
|
|
(vd.exp == lim->d.exp)) {
|
|
id = lim->ieee;
|
|
goto shipit;
|
|
}
|
|
}
|
|
id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
|
|
id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
|
|
id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
|
|
(vd.mantissa3 << 13) |
|
|
((vd.mantissa4 >> 3) & MASK(13));
|
|
shipit:
|
|
id.sign = vd.sign;
|
|
lp = (int32_t *)&id;
|
|
return (XDR_PUTINT32(xdrs, lp++) && XDR_PUTINT32(xdrs, lp));
|
|
#endif
|
|
|
|
case XDR_DECODE:
|
|
#ifdef IEEEFP
|
|
i32p = (int32_t *)(void *)dp;
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
rv = XDR_GETINT32(xdrs, i32p);
|
|
if (!rv)
|
|
return (rv);
|
|
rv = XDR_GETINT32(xdrs, i32p+1);
|
|
#else
|
|
rv = XDR_GETINT32(xdrs, i32p+1);
|
|
if (!rv)
|
|
return (rv);
|
|
rv = XDR_GETINT32(xdrs, i32p);
|
|
#endif
|
|
return (rv);
|
|
#else
|
|
lp = (int32_t *)&id;
|
|
if (!XDR_GETINT32(xdrs, lp++) || !XDR_GETINT32(xdrs, lp))
|
|
return (FALSE);
|
|
for (i = 0, lim = dbl_limits; i < nitems(dbl_limits);
|
|
i++, lim++) {
|
|
if ((id.mantissa2 == lim->ieee.mantissa2) &&
|
|
(id.mantissa1 == lim->ieee.mantissa1) &&
|
|
(id.exp == lim->ieee.exp)) {
|
|
vd = lim->d;
|
|
goto doneit;
|
|
}
|
|
}
|
|
vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
|
|
vd.mantissa1 = (id.mantissa1 >> 13);
|
|
vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
|
|
(id.mantissa2 >> 29);
|
|
vd.mantissa3 = (id.mantissa2 >> 13);
|
|
vd.mantissa4 = (id.mantissa2 << 3);
|
|
doneit:
|
|
vd.sign = id.sign;
|
|
*dp = *((double *)&vd);
|
|
return (TRUE);
|
|
#endif
|
|
|
|
case XDR_FREE:
|
|
return (TRUE);
|
|
}
|
|
/* NOTREACHED */
|
|
return (FALSE);
|
|
}
|