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/*
* Copyright (c) 2009, Sun Microsystems, Inc.
* All rights reserved.
*
* 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 Sun Microsystems, 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.
*/
#include <config.h>
#include <sys/cdefs.h>
/*
* xdr_float.c, Generic XDR routines implementation.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* 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/types.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.
*/
#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 */
};
#else
#if defined(__linux__)
#include <bits/endian.h>
#elif defined(_WIN32)
/* XXX */
#elif defined(__APPLE__)
#include <sys/_endian.h>
#else
#include <sys/endian.h>
#endif
#define IEEEFP
#endif /* vax */
bool
xdr_float(XDR *xdrs, float *fp)
{
#ifndef IEEEFP
struct ieee_single is;
struct vax_single vs, *vsp;
struct sgl_limits *lim;
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 < sizeof(sgl_limits) / sizeof(struct 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 < sizeof(sgl_limits) / sizeof(struct 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
xdr_double(XDR *xdrs, double *dp)
{
#ifdef IEEEFP
int32_t *i32p;
bool rv;
#else
int32_t *lp;
struct ieee_double id;
struct vax_double vd;
struct dbl_limits *lim;
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 < sizeof(dbl_limits) / sizeof(struct 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 < sizeof(dbl_limits) / sizeof(struct 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);
}