/*

 * xdr_float.c, Generic XDR routines implementation.

 *

 * 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.

 *

 * 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 <endian.h>

#include <rpc/types.h>

#include <rpc/xdr.h>

#include <shlib-compat.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 (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);

}

libc_hidden_nolink_sunrpc (xdr_float, GLIBC_2_0)

/*

 * 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)

{

#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);

}

libc_hidden_nolink_sunrpc (xdr_double, GLIBC_2_0)