268 lines
6.6 KiB
C
268 lines
6.6 KiB
C
/* @(#)xdr_float.c 2.1 88/07/29 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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#if !defined(lint) && defined(SCCSIDS)
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static char sccsid[] = "@(#)xdr_float.c 1.12 87/08/11 Copyr 1984 Sun Micro";
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#endif
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/*
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* xdr_float.c, Generic XDR routines impelmentation.
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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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#include <stdio.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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/*
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* NB: Not portable.
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* This routine works on Suns (Sky / 68000's) and Vaxen.
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*/
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#ifdef vax
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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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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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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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static struct sgl_limits {
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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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{{ 0x7f, 0xff, 0x0, 0xffff }, /* Max Vax */
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{ 0x0, 0xff, 0x0 }}, /* Max IEEE */
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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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#endif /* vax */
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bool_t
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xdr_float(xdrs, fp)
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register XDR *xdrs;
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register float *fp;
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{
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#ifdef vax
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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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#endif
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switch (xdrs->x_op) {
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case XDR_ENCODE:
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#ifndef vax
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return (XDR_PUTLONG(xdrs, (long *)fp));
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#else
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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);
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i++, lim++) {
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if ((vs.mantissa2 == lim->s.mantissa2) &&
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(vs.exp == lim->s.exp) &&
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(vs.mantissa1 == lim->s.mantissa1)) {
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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_PUTLONG(xdrs, (long *)&is));
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#endif
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case XDR_DECODE:
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#ifndef vax
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return (XDR_GETLONG(xdrs, (long *)fp));
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#else
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vsp = (struct vax_single *)fp;
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if (!XDR_GETLONG(xdrs, (long *)&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);
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i++, lim++) {
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if ((is.exp == lim->ieee.exp) &&
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(is.mantissa == lim->ieee.mantissa)) {
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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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#endif
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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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/*
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* This routine works on Suns (Sky / 68000's) and Vaxen.
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*/
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#ifdef vax
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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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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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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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static struct dbl_limits {
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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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{{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
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{ 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
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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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#endif /* vax */
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bool_t
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xdr_double(xdrs, dp)
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register XDR *xdrs;
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double *dp;
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{
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register long *lp;
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#ifdef vax
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struct ieee_double id;
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struct vax_double vd;
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register struct dbl_limits *lim;
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int i;
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#endif
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switch (xdrs->x_op) {
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case XDR_ENCODE:
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#ifndef vax
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lp = (long *)dp;
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#else
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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);
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i++, lim++) {
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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) &&
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(vd.exp == lim->d.exp)) {
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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) |
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((vd.mantissa4 >> 3) & MASK(13));
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shipit:
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id.sign = vd.sign;
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lp = (long *)&id;
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#endif
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return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
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case XDR_DECODE:
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#ifndef vax
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lp = (long *)dp;
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return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
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#else
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lp = (long *)&id;
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if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(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);
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i++, lim++) {
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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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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) |
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(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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#endif
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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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