/* @(#)xdr_float.c      2.1 88/07/29 4.0 RPCSRC */
/*
 * Copyright (c) 2010, Oracle America, 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 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.
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * xdr_float.c, Generic XDR routines impelmentation.
 *
 * 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 <gssrpc/types.h>
#include <gssrpc/xdr.h>

/*
 * NB: Not portable.
 * This routine works on Suns (Sky / 68000's) and Vaxen.
 */
#ifdef IGNORE

#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(XDR *xdrs, float *fp)
{
#if defined(vax)
        struct ieee_single is;
        struct vax_single vs, *vsp;
        struct sgl_limits *lim;
        int i;
#endif
        long lg;

        switch (xdrs->x_op) {

        case XDR_ENCODE:
#if !defined(vax)
                lg = * (int_32 *) fp;
                return (XDR_PUTLONG(xdrs, &lg));
#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, (int32_t *)&is));
#endif

        case XDR_DECODE:
#if !defined(vax)
                if (!(XDR_GETLONG(xdrs, &lg))) {
                        return (FALSE);
                }
                *fp = (float) ((int) lg);
                return (TRUE);
#else
                vsp = (struct vax_single *)fp;
                if (!XDR_GETLONG(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);
        }
        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(XDR *xdrs, double *dp)
{
        int32_t *lp;
#if defined(vax)
        struct  ieee_double id;
        struct  vax_double vd;
        struct dbl_limits *lim;
        int i;
#endif

        switch (xdrs->x_op) {

        case XDR_ENCODE:
#if !defined(vax)
                lp = (int32_t *)dp;
                if (sizeof(int32_t) == sizeof(long)) {
                  return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
                } else {
                  long lg1 = *lp++;;
                  long lg2 = *lp;
                  return (XDR_PUTLONG(xdrs, &lg1) && XDR_PUTLONG(xdrs, &lg2));
                }
#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_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
#endif

        case XDR_DECODE:
#if !defined(vax)
                lp = (int32_t *)dp;
                if (sizeof(int32_t) == sizeof(long)) {
                  return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
                } else {
                  long lg1, lg2;
                  bool_t flag =
                   (XDR_GETLONG(xdrs, &lg1) && XDR_GETLONG(xdrs, &lg2));
                  *lp++ = lg1;
                  *lp = lg2;
                  return flag;
                }
#else
                lp = (int32_t *)&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);
}

#endif /* IGNORE */