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/* @(#)xdr_float.c      2.1 88/07/29 4.0 RPCSRC */

/*

 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for

 * unrestricted use provided that this legend is included on all tape

 * media and as a part of the software program in whole or part.  Users

 * may copy or modify Sun RPC without charge, but are not authorized

 * to license or distribute it to anyone else except as part of a product or

 * program developed by the user.

 *

 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE

 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.

 *

 * Sun RPC is provided with no support and without any obligation on the

 * part of Sun Microsystems, Inc. to assist in its use, correction,

 * modification or enhancement.

 *

 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE

 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC

 * OR ANY PART THEREOF.

 *

 * In no event will Sun Microsystems, Inc. be liable for any lost revenue

 * or profits or other special, indirect and consequential damages, even if

 * Sun has been advised of the possibility of such damages.

 *

 * Sun Microsystems, Inc.

 * 2550 Garcia Avenue

 * Mountain View, California  94043

 */

#if 0

static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";

#endif

/*

 * 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.

 */

#define __FORCE_GLIBC

#define _GNU_SOURCE

#include <features.h>

#include <stdio.h>

#include <endian.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

/*

 * NB: Not portable.

 * This routine works on Suns (Sky / 68000's) and Vaxen.

 */

#define LSW     (__FLOAT_WORD_ORDER == __BIG_ENDIAN)

#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 */

};

#endif /* vax */

bool_t

xdr_float(xdrs, fp)

     XDR *xdrs;

     float *fp;

{

#ifdef vax

        struct ieee_single is;

        struct vax_single vs, *vsp;

        struct sgl_limits *lim;

        int i;

#endif

        switch (xdrs->x_op) {

        case XDR_ENCODE:

#ifdef vax

                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));

#else

                if (sizeof(float) == sizeof(long))

                        return (XDR_PUTLONG(xdrs, (long *)fp));

                else if (sizeof(float) == sizeof(int)) {

                        long tmp = *(int *)fp;

                        return (XDR_PUTLONG(xdrs, &tmp));

                }

                break;

#endif

        case XDR_DECODE:

#ifdef vax

                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);

#else

                if (sizeof(float) == sizeof(long))

                        return (XDR_GETLONG(xdrs, (long *)fp));

                else if (sizeof(float) == sizeof(int)) {

                        long tmp;

                        if (XDR_GETLONG(xdrs, &tmp)) {

                                *(int *)fp = tmp;

                                return (TRUE);

                        }

                }

                break;

#endif

        case XDR_FREE:

                return (TRUE);

        }

        return (FALSE);

}

/*

 * This routine works on Suns (Sky / 68000's) and Vaxen.

 */

#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(xdrs, dp)

     XDR *xdrs;

     double *dp;

{

#ifdef vax

        struct  ieee_double id;

        struct  vax_double vd;

        register struct dbl_limits *lim;

        int i;

#endif

        switch (xdrs->x_op) {

        case XDR_ENCODE:

#ifdef vax

                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;

                dp = (double *)&id;

#endif

                if (2*sizeof(long) == sizeof(double)) {

                        long *lp = (long *)dp;

                        return (XDR_PUTLONG(xdrs, lp+!LSW) &&

                                XDR_PUTLONG(xdrs, lp+LSW));

                } else if (2*sizeof(int) == sizeof(double)) {

                        int *ip = (int *)dp;

                        long tmp[2];

                        tmp[0] = ip[!LSW];

                        tmp[1] = ip[LSW];

                        return (XDR_PUTLONG(xdrs, tmp) &&

                                XDR_PUTLONG(xdrs, tmp+1));

                }

                break;

        case XDR_DECODE:

#ifdef vax

                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);

#else

                if (2*sizeof(long) == sizeof(double)) {

                        long *lp = (long *)dp;

                        return (XDR_GETLONG(xdrs, lp+!LSW) &&

                                XDR_GETLONG(xdrs, lp+LSW));

                } else if (2*sizeof(int) == sizeof(double)) {

                        int *ip = (int *)dp;

                        long tmp[2];

                        if (XDR_GETLONG(xdrs, tmp+!LSW) &&

                            XDR_GETLONG(xdrs, tmp+LSW)) {

                                ip[0] = tmp[0];

                                ip[1] = tmp[1];

                                return (TRUE);

                        }

                }

                break;

#endif

        case XDR_FREE:

                return (TRUE);

        }

        return (FALSE);

}