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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 !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.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+
+#include <rpc/types.h>
+#include <rpc/xdr.h>
+
+/*
+ * NB: Not portable.
+ * This routine works on Suns (Sky / 68000's) and Vaxen.
+ */
+
+#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)
+ register XDR *xdrs;
+ register 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:
+#ifndef vax
+ return (XDR_PUTLONG(xdrs, (long *)fp));
+#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, (long *)&is));
+#endif
+
+ case XDR_DECODE:
+#ifndef vax
+ return (XDR_GETLONG(xdrs, (long *)fp));
+#else
+ 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);
+#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)
+ register XDR *xdrs;
+ double *dp;
+{
+ register long *lp;
+#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:
+#ifndef vax
+ lp = (long *)dp;
+#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 = (long *)&id;
+#endif
+ return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
+
+ case XDR_DECODE:
+#ifndef vax
+ lp = (long *)dp;
+ return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
+#else
+ 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);
+#endif
+
+ case XDR_FREE:
+ return (TRUE);
+ }
+ return (FALSE);
+}
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