| /* @(#)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 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. |
| */ |
| |
| #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); |
| } |