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1.1 root 1: /*
2: * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3: * unrestricted use provided that this legend is included on all tape
4: * media and as a part of the software program in whole or part. Users
5: * may copy or modify Sun RPC without charge, but are not authorized
6: * to license or distribute it to anyone else except as part of a product or
7: * program developed by the user.
8: *
9: * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10: * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11: * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12: *
13: * Sun RPC is provided with no support and without any obligation on the
14: * part of Sun Microsystems, Inc. to assist in its use, correction,
15: * modification or enhancement.
16: *
17: * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18: * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19: * OR ANY PART THEREOF.
20: *
21: * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22: * or profits or other special, indirect and consequential damages, even if
23: * Sun has been advised of the possibility of such damages.
24: *
25: * Sun Microsystems, Inc.
26: * 2550 Garcia Avenue
27: * Mountain View, California 94043
28: */
29: #ifndef lint
30: static char sccsid[] = "@(#)xdr_float.c 1.2 85/03/14 Copyr 1984 Sun Micro";
31: #endif
32:
33: /*
34: * xdr_float.c, Generic XDR routines impelmentation.
35: *
36: * Copyright (C) 1984, Sun Microsystems, Inc.
37: *
38: * These are the "floating point" xdr routines used to (de)serialize
39: * most common data items. See xdr.h for more info on the interface to
40: * xdr.
41: */
42:
43: #include "types.h"
44: #include "xdr.h"
45: #include <stdio.h>
46:
47: /*
48: * NB: Not portable.
49: * This routine works on Suns (Sky / 68000's) and Vaxen.
50: */
51:
52: /* What IEEE single precision floating point looks like on a Vax */
53: struct ieee_single {
54: unsigned int mantissa: 23;
55: unsigned int exp : 8;
56: unsigned int sign : 1;
57: };
58:
59: /* Vax single precision floating point */
60: struct vax_single {
61: unsigned int mantissa1 : 7;
62: unsigned int exp : 8;
63: unsigned int sign : 1;
64: unsigned int mantissa2 : 16;
65:
66: };
67:
68: #define VAX_SNG_BIAS 0x81
69: #define IEEE_SNG_BIAS 0x7f
70:
71: static struct sgl_limits {
72: struct vax_single s;
73: struct ieee_single ieee;
74: } sgl_limits[2] = {
75: {{ 0x3f, 0xff, 0x0, 0xffff }, /* Max Vax */
76: { 0x0, 0xff, 0x0 }}, /* Max IEEE */
77: {{ 0x0, 0x0, 0x0, 0x0 }, /* Min Vax */
78: { 0x0, 0x0, 0x0 }} /* Min IEEE */
79: };
80:
81: bool_t
82: xdr_float(xdrs, fp)
83: register XDR *xdrs;
84: register float *fp;
85: {
86: struct ieee_single is;
87: struct vax_single vs, *vsp;
88: struct sgl_limits *lim;
89: int i;
90:
91: switch (xdrs->x_op) {
92:
93: case XDR_ENCODE:
94: #ifdef mc68000
95: return (XDR_PUTLONG(xdrs, (long *)fp));
96: #else
97: vs = *((struct vax_single *)fp);
98: for (i = 0, lim = sgl_limits;
99: i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
100: i++, lim++) {
101: if ((vs.mantissa2 == lim->s.mantissa2) &&
102: (vs.exp == lim->s.exp) &&
103: (vs.mantissa1 == lim->s.mantissa1)) {
104: is = lim->ieee;
105: goto shipit;
106: }
107: }
108: is.exp = vs.exp - VAX_SNG_BIAS + IEEE_SNG_BIAS;
109: is.mantissa = (vs.mantissa1 << 16) | vs.mantissa2;
110: shipit:
111: is.sign = vs.sign;
112: return (XDR_PUTLONG(xdrs, (long *)&is));
113: #endif
114:
115: case XDR_DECODE:
116: #ifdef mc68000
117: return (XDR_GETLONG(xdrs, (long *)fp));
118: #else
119: vsp = (struct vax_single *)fp;
120: if (!XDR_GETLONG(xdrs, (long *)&is))
121: return (FALSE);
122: for (i = 0, lim = sgl_limits;
123: i < sizeof(sgl_limits)/sizeof(struct sgl_limits);
124: i++, lim++) {
125: if ((is.exp == lim->ieee.exp) &&
126: (is.mantissa = lim->ieee.mantissa)) {
127: *vsp = lim->s;
128: goto doneit;
129: }
130: }
131: vsp->exp = is.exp - IEEE_SNG_BIAS + VAX_SNG_BIAS;
132: vsp->mantissa2 = is.mantissa;
133: vsp->mantissa1 = (is.mantissa >> 16);
134: doneit:
135: vsp->sign = is.sign;
136: return (TRUE);
137: #endif
138:
139: case XDR_FREE:
140: return (TRUE);
141: }
142: return (FALSE);
143: }
144:
145: /*
146: * This routine works on Suns (Sky / 68000's) and Vaxen.
147: */
148:
149: /* What IEEE double precision floating point looks like on a Vax */
150: struct ieee_double {
151: unsigned int mantissa1 : 20;
152: unsigned int exp : 11;
153: unsigned int sign : 1;
154: unsigned int mantissa2 : 32;
155: };
156:
157: /* Vax double precision floating point */
158: struct vax_double {
159: unsigned int mantissa1 : 7;
160: unsigned int exp : 8;
161: unsigned int sign : 1;
162: unsigned int mantissa2 : 16;
163: unsigned int mantissa3 : 16;
164: unsigned int mantissa4 : 16;
165: };
166:
167: #define VAX_DBL_BIAS 0x81
168: #define IEEE_DBL_BIAS 0x3ff
169: #define MASK(nbits) ((1 << nbits) - 1)
170:
171: static struct dbl_limits {
172: struct vax_double d;
173: struct ieee_double ieee;
174: } dbl_limits[2] = {
175: {{ 0x7f, 0xff, 0x0, 0xffff, 0xffff, 0xffff }, /* Max Vax */
176: { 0x0, 0x7ff, 0x0, 0x0 }}, /* Max IEEE */
177: {{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* Min Vax */
178: { 0x0, 0x0, 0x0, 0x0 }} /* Min IEEE */
179: };
180:
181: bool_t
182: xdr_double(xdrs, dp)
183: register XDR *xdrs;
184: double *dp;
185: {
186: register long *lp;
187: struct ieee_double id;
188: struct vax_double vd;
189: register struct dbl_limits *lim;
190: int i;
191:
192: switch (xdrs->x_op) {
193:
194: case XDR_ENCODE:
195: #ifdef mc68000
196: lp = (long *)dp;
197: #else
198: vd = *((struct vax_double *)dp);
199: for (i = 0, lim = dbl_limits;
200: i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
201: i++, lim++) {
202: if ((vd.mantissa4 == lim->d.mantissa4) &&
203: (vd.mantissa3 == lim->d.mantissa3) &&
204: (vd.mantissa2 == lim->d.mantissa2) &&
205: (vd.mantissa1 == lim->d.mantissa1) &&
206: (vd.exp == lim->d.exp)) {
207: id = lim->ieee;
208: goto shipit;
209: }
210: }
211: id.exp = vd.exp - VAX_DBL_BIAS + IEEE_DBL_BIAS;
212: id.mantissa1 = (vd.mantissa1 << 13) | (vd.mantissa2 >> 3);
213: id.mantissa2 = ((vd.mantissa2 & MASK(3)) << 29) |
214: (vd.mantissa3 << 13) |
215: ((vd.mantissa4 >> 3) & MASK(13));
216: shipit:
217: id.sign = vd.sign;
218: lp = (long *)&id;
219: #endif
220: return (XDR_PUTLONG(xdrs, lp++) && XDR_PUTLONG(xdrs, lp));
221:
222: case XDR_DECODE:
223: #ifdef mc68000
224: lp = (long *)dp;
225: return (XDR_GETLONG(xdrs, lp++) && XDR_GETLONG(xdrs, lp));
226: #else
227: lp = (long *)&id;
228: if (!XDR_GETLONG(xdrs, lp++) || !XDR_GETLONG(xdrs, lp))
229: return (FALSE);
230: for (i = 0, lim = dbl_limits;
231: i < sizeof(dbl_limits)/sizeof(struct dbl_limits);
232: i++, lim++) {
233: if ((id.mantissa2 == lim->ieee.mantissa2) &&
234: (id.mantissa1 == lim->ieee.mantissa1) &&
235: (id.exp == lim->ieee.exp)) {
236: vd = lim->d;
237: goto doneit;
238: }
239: }
240: vd.exp = id.exp - IEEE_DBL_BIAS + VAX_DBL_BIAS;
241: vd.mantissa1 = (id.mantissa1 >> 13);
242: vd.mantissa2 = ((id.mantissa1 & MASK(13)) << 3) |
243: (id.mantissa2 >> 29);
244: vd.mantissa3 = (id.mantissa2 >> 13);
245: vd.mantissa4 = (id.mantissa2 << 3);
246: doneit:
247: vd.sign = id.sign;
248: *dp = *((double *)&vd);
249: return (TRUE);
250: #endif
251:
252: case XDR_FREE:
253: return (TRUE);
254: }
255: return (FALSE);
256: }
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