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/* $OpenBSD: xdr_float.c,v 1.20 2011/07/26 11:43:01 martynas 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.
*/
/*
* 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 <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
/*
* NB: Not portable.
* This routine works on machines with IEEE754 FP and Vaxen.
*/
#ifdef __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
#include <machine/endian.h>
#define IEEEFP
#endif
bool_t
xdr_float(XDR *xdrs, float *fp)
{
#ifdef IEEEFP
bool_t rv;
long tmpl;
#else
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
tmpl = *(int32_t *)fp;
return (XDR_PUTLONG(xdrs, &tmpl));
#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_PUTLONG(xdrs, (long *)&is));
#endif
case XDR_DECODE:
#ifdef IEEEFP
rv = XDR_GETLONG(xdrs, &tmpl);
*(int32_t *)fp = tmpl;
return (rv);
#else
vsp = (struct vax_single *)fp;
if (!XDR_GETLONG(xdrs, (long *)&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);
}
return (FALSE);
}
#ifdef __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;
long tmpl;
#else
long *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 *)dp;
#if (BYTE_ORDER == BIG_ENDIAN) || (defined(__arm__) && !defined(__VFP_FP__))
tmpl = *i32p++;
rv = XDR_PUTLONG(xdrs, &tmpl);
if (!rv)
return (rv);
tmpl = *i32p;
rv = XDR_PUTLONG(xdrs, &tmpl);
#else
tmpl = *(i32p+1);
rv = XDR_PUTLONG(xdrs, &tmpl);
if (!rv)
return (rv);
tmpl = *i32p;
rv = XDR_PUTLONG(xdrs, &tmpl);
#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 = (long *)&id;
return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
#endif
case XDR_DECODE:
#ifdef IEEEFP
i32p = (int32_t *)dp;
#if (BYTE_ORDER == BIG_ENDIAN) || (defined(__arm__) && !defined(__VFP_FP__))
rv = XDR_GETLONG(xdrs, &tmpl);
*i32p++ = tmpl;
if (!rv)
return (rv);
rv = XDR_GETLONG(xdrs, &tmpl);
*i32p = tmpl;
#else
rv = XDR_GETLONG(xdrs, &tmpl);
*(i32p+1) = tmpl;
if (!rv)
return (rv);
rv = XDR_GETLONG(xdrs, &tmpl);
*i32p = tmpl;
#endif
return (rv);
#else
lp = (long *)&id;
if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(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);
}
return (FALSE);
}
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