mirror of
https://github.com/autc04/Retro68.git
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255 lines
7.0 KiB
C
255 lines
7.0 KiB
C
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/*
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* xdr_float_vax.c, XDR floating point routines for vax.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*
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* These are the "floating point" xdr routines used to (de)serialize
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* most common data items. See xdr.h for more info on the interface to
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* xdr.
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*/
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#ifndef XDR_FLOAT_C
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#error "Must be included from xdr_float.c"
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#endif
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/* What IEEE single precision floating point looks like on a Vax */
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struct ieee_single
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{
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unsigned int mantissa:23;
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unsigned int exp:8;
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unsigned int sign:1;
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};
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/* Vax single precision floating point */
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struct vax_single
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{
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unsigned int mantissa1:7;
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unsigned int exp:8;
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unsigned int sign:1;
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unsigned int mantissa2:16;
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};
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# define VAX_SNG_BIAS 0x81
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# define IEEE_SNG_BIAS 0x7f
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/* *INDENT-OFF*
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*/
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static struct sgl_limits
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{
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struct vax_single s;
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struct ieee_single ieee;
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} sgl_limits[2] =
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{
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{
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{0x7f, 0xff, 0x0, 0xffff}, /* Max Vax */
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{0x0, 0xff, 0x0} /* Max IEEE */
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},
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{
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{0x0, 0x0, 0x0, 0x0}, /* Min Vax */
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{0x0, 0x0, 0x0} /* Min IEEE */
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}
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};
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/* *INDENT-ON*
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*/
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bool_t
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_DEFUN (xdr_float, (xdrs, fp),
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XDR * xdrs _AND
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float *fp)
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{
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struct ieee_single is;
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struct vax_single vs, *vsp;
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struct sgl_limits *lim;
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int i;
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switch (xdrs->x_op)
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{
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case XDR_ENCODE:
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vs = *((struct vax_single *) fp);
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for (i = 0, lim = sgl_limits;
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i < sizeof (sgl_limits) / sizeof (struct sgl_limits); i++, lim++)
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{
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if ((vs.mantissa2 == lim->s.mantissa2) &&
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(vs.exp == lim->s.exp) && (vs.mantissa1 == lim->s.mantissa1))
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{
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is = lim->ieee;
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goto shipit;
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}
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}
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is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
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is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
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shipit:
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is.sign = vs.sign;
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return (XDR_PUTINT32 (xdrs, (int32_t *) & is));
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case XDR_DECODE:
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vsp = (struct vax_single *) fp;
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if (!XDR_GETINT32 (xdrs, (int32_t *) & is))
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return FALSE;
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for (i = 0, lim = sgl_limits;
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i < sizeof (sgl_limits) / sizeof (struct sgl_limits); i++, lim++)
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{
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if ((is.exp == lim->ieee.exp) &&
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(is.mantissa == lim->ieee.mantissa))
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{
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*vsp = lim->s;
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goto doneit;
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}
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}
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vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
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vsp->mantissa2 = is.mantissa;
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vsp->mantissa1 = (is.mantissa >> 16);
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doneit:
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vsp->sign = is.sign;
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return TRUE;
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case XDR_FREE:
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return TRUE;
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}
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return FALSE;
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}
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#if !defined(_DOUBLE_IS_32BITS)
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/* What IEEE double precision floating point looks like on a Vax */
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struct ieee_double
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{
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unsigned int mantissa1:20;
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unsigned int exp:11;
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unsigned int sign:1;
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unsigned int mantissa2:32;
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};
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/* Vax double precision floating point */
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struct vax_double
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{
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unsigned int mantissa1:7;
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unsigned int exp:8;
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unsigned int sign:1;
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unsigned int mantissa2:16;
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unsigned int mantissa3:16;
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unsigned int mantissa4:16;
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};
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# define VAX_DBL_BIAS 0x81
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# define IEEE_DBL_BIAS 0x3ff
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# define MASK(nbits) ((1 << nbits) - 1)
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/* *INDENT-OFF*
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*/
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static struct dbl_limits
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{
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struct vax_double d;
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struct ieee_double ieee;
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} dbl_limits[2] =
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{
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{
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{0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff}, /* Max Vax */
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{0x0, 0x7ff, 0x0, 0x0} /* Max IEEE */
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},
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{
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{0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
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{0x0, 0x0, 0x0, 0x0} /* Min IEEE */
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}
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};
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/* *INDENT-ON*
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*/
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bool_t
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_DEFUN (xdr_double, (xdrs, dp),
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XDR * xdrs _AND
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double *dp)
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{
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int32_t *lp;
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struct ieee_double id;
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struct vax_double vd;
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struct dbl_limits *lim;
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int i;
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switch (xdrs->x_op)
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{
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case XDR_ENCODE:
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vd = *((struct vax_double *) dp);
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for (i = 0, lim = dbl_limits;
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i < sizeof (dbl_limits) / sizeof (struct dbl_limits); i++, lim++)
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{
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if ((vd.mantissa4 == lim->d.mantissa4) &&
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(vd.mantissa3 == lim->d.mantissa3) &&
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(vd.mantissa2 == lim->d.mantissa2) &&
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(vd.mantissa1 == lim->d.mantissa1) && (vd.exp == lim->d.exp))
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{
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id = lim->ieee;
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goto shipit;
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}
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}
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id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
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id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
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id.mantissa2 = ((vd.mantissa2 & MASK (3)) << 29) |
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(vd.mantissa3 << 13) | ((vd.mantissa4 >> 3) & MASK (13));
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shipit:
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id.sign = vd.sign;
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lp = (int32_t *) & id;
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return (XDR_PUTINT32 (xdrs, lp++) && XDR_PUTINT32 (xdrs, lp));
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case XDR_DECODE:
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lp = (int32_t *) & id;
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if (!XDR_GETINT32 (xdrs, lp++) || !XDR_GETINT32 (xdrs, lp))
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return FALSE;
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for (i = 0, lim = dbl_limits;
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i < sizeof (dbl_limits) / sizeof (struct dbl_limits); i++, lim++)
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{
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if ((id.mantissa2 == lim->ieee.mantissa2) &&
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(id.mantissa1 == lim->ieee.mantissa1) &&
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(id.exp == lim->ieee.exp))
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{
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vd = lim->d;
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goto doneit;
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}
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}
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vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
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vd.mantissa1 = (id.mantissa1 >> 13);
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vd.mantissa2 = ((id.mantissa1 & MASK (13)) << 3) | (id.mantissa2 >> 29);
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vd.mantissa3 = (id.mantissa2 >> 13);
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vd.mantissa4 = (id.mantissa2 << 3);
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doneit:
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vd.sign = id.sign;
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*dp = *((double *) &vd);
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return TRUE;
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case XDR_FREE:
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return TRUE;
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}
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return FALSE;
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}
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#endif /* !_DOUBLE_IS_32BITS */
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