mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-08 20:55:01 +00:00
255 lines
7.0 KiB
C
255 lines
7.0 KiB
C
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* xdr_float_vax.c, XDR floating point routines for vax.
|
|
*
|
|
* 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.
|
|
*/
|
|
#ifndef XDR_FLOAT_C
|
|
#error "Must be included from xdr_float.c"
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
/* *INDENT-OFF*
|
|
*/
|
|
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 */
|
|
}
|
|
};
|
|
/* *INDENT-ON*
|
|
*/
|
|
|
|
bool_t
|
|
_DEFUN (xdr_float, (xdrs, fp),
|
|
XDR * xdrs _AND
|
|
float *fp)
|
|
{
|
|
struct ieee_single is;
|
|
struct vax_single vs, *vsp;
|
|
struct sgl_limits *lim;
|
|
int i;
|
|
switch (xdrs->x_op)
|
|
{
|
|
|
|
case XDR_ENCODE:
|
|
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));
|
|
|
|
case XDR_DECODE:
|
|
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;
|
|
|
|
case XDR_FREE:
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
#if !defined(_DOUBLE_IS_32BITS)
|
|
|
|
/* 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)
|
|
|
|
/* *INDENT-OFF*
|
|
*/
|
|
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 */
|
|
}
|
|
};
|
|
/* *INDENT-ON*
|
|
*/
|
|
|
|
bool_t
|
|
_DEFUN (xdr_double, (xdrs, dp),
|
|
XDR * xdrs _AND
|
|
double *dp)
|
|
{
|
|
int32_t *lp;
|
|
struct ieee_double id;
|
|
struct vax_double vd;
|
|
struct dbl_limits *lim;
|
|
int i;
|
|
|
|
switch (xdrs->x_op)
|
|
{
|
|
|
|
case XDR_ENCODE:
|
|
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));
|
|
|
|
case XDR_DECODE:
|
|
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;
|
|
|
|
case XDR_FREE:
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
#endif /* !_DOUBLE_IS_32BITS */
|
|
|