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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: /* @(#)xdr.h 1.4 85/02/08 SMI */
30:
31: /*
32: * xdr.h, External Data Representation Serialization Routines.
33: *
34: * Copyright (C) 1984, Sun Microsystems, Inc.
35: */
36:
37: /*
38: * XDR provides a conventional way for converting between C data
39: * types and an external bit-string representation. Library supplied
40: * routines provide for the conversion on built-in C data types. These
41: * routines and utility routines defined here are used to help implement
42: * a type encode/decode routine for each user-defined type.
43: *
44: * Each data type provides a single procedure which takes two arguments:
45: *
46: * bool_t
47: * xdrproc(xdrs, argresp)
48: * XDR *xdrs;
49: * <type> *argresp;
50: *
51: * xdrs is an instance of a XDR handle, to which or from which the data
52: * type is to be converted. argresp is a pointer to the structure to be
53: * converted. The XDR handle contains an operation field which indicates
54: * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
55: *
56: * XDR_DECODE may allocate space if the pointer argresp is null. This
57: * data can be freed with the XDR_FREE operation.
58: *
59: * We write only one procedure per data type to make it easy
60: * to keep the encode and decode procedures for a data type consistent.
61: * In many cases the same code performs all operations on a user defined type,
62: * because all the hard work is done in the component type routines.
63: * decode as a series of calls on the nested data types.
64: */
65:
66: /*
67: * Xdr operations. XDR_ENCODE causes the type to be encoded into the
68: * stream. XDR_DECODE causes the type to be extracted from the stream.
69: * XDR_FREE can be used to release the space allocated by an XDR_DECODE
70: * request.
71: */
72: enum xdr_op {
73: XDR_ENCODE=0,
74: XDR_DECODE=1,
75: XDR_FREE=2
76: };
77:
78: /*
79: * This is the number of bytes per unit of external data.
80: */
81: #define BYTES_PER_XDR_UNIT (4)
82:
83: /*
84: * A xdrproc_t exists for each data type which is to be encoded or decoded.
85: *
86: * The second argument to the xdrproc_t is a pointer to an opaque pointer.
87: * The opaque pointer generally points to a structure of the data type
88: * to be decoded. If this pointer is 0, then the type routines should
89: * allocate dynamic storage of the appropriate size and return it.
90: * bool_t (*xdrproc_t)(XDR *, caddr_t *);
91: */
92: typedef bool_t (*xdrproc_t)();
93:
94: /*
95: * The XDR handle.
96: * Contains operation which is being applied to the stream,
97: * an operations vector for the paticular implementation (e.g. see xdr_mem.c),
98: * and two private fields for the use of the particular impelementation.
99: */
100: typedef struct {
101: enum xdr_op x_op; /* operation; fast additional param */
102: struct xdr_ops {
103: bool_t (*x_getlong)(); /* get a long from underlying stream */
104: bool_t (*x_putlong)(); /* put a long to " */
105: bool_t (*x_getbytes)();/* get some bytes from " */
106: bool_t (*x_putbytes)();/* put some bytes to " */
107: u_int (*x_getpostn)();/* returns bytes off from beginning */
108: bool_t (*x_setpostn)();/* lets you reposition the stream */
109: long * (*x_inline)(); /* buf quick ptr to buffered data */
110: void (*x_destroy)(); /* free privates of this xdr_stream */
111: } *x_ops;
112: caddr_t x_public; /* users' data */
113: caddr_t x_private; /* pointer to private data */
114: caddr_t x_base; /* private used for position info */
115: int x_handy; /* extra private word */
116: } XDR;
117:
118: /*
119: * Operations defined on a XDR handle
120: *
121: * XDR *xdrs;
122: * long *longp;
123: * caddr_t addr;
124: * u_int len;
125: * u_int pos;
126: */
127: #define XDR_GETLONG(xdrs, longp) \
128: (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
129: #define xdr_getlong(xdrs, longp) \
130: (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
131:
132: #define XDR_PUTLONG(xdrs, longp) \
133: (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
134: #define xdr_putlong(xdrs, longp) \
135: (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
136:
137: #define XDR_GETBYTES(xdrs, addr, len) \
138: (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
139: #define xdr_getbytes(xdrs, addr, len) \
140: (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
141:
142: #define XDR_PUTBYTES(xdrs, addr, len) \
143: (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
144: #define xdr_putbytes(xdrs, addr, len) \
145: (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
146:
147: #define XDR_GETPOS(xdrs) \
148: (*(xdrs)->x_ops->x_getpostn)(xdrs)
149: #define xdr_getpos(xdrs) \
150: (*(xdrs)->x_ops->x_getpostn)(xdrs)
151:
152: #define XDR_SETPOS(xdrs, pos) \
153: (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
154: #define xdr_setpos(xdrs, pos) \
155: (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
156:
157: #define XDR_INLINE(xdrs, len) \
158: (*(xdrs)->x_ops->x_inline)(xdrs, len)
159: #define xdr_inline(xdrs, len) \
160: (*(xdrs)->x_ops->x_inline)(xdrs, len)
161:
162: #define XDR_DESTROY(xdrs) \
163: if ((xdrs)->x_ops->x_destroy) \
164: (*(xdrs)->x_ops->x_destroy)(xdrs)
165: #define xdr_destroy(xdrs) \
166: if ((xdrs)->x_ops->x_destroy) \
167: (*(xdrs)->x_ops->x_destroy)(xdrs)
168:
169: /*
170: * Support struct for discriminated unions.
171: * You create an array of xdrdiscrim structures, terminated with
172: * a entry with a null procedure pointer. The xdr_union routine gets
173: * the discriminant value and then searches the array of structures
174: * for a matching value. If a match is found the associated xdr routine
175: * is called to handle that part of the union. If there is
176: * no match, then a default routine may be called.
177: * If there is no match and no default routine it is an error.
178: */
179: #define NULL_xdrproc_t ((xdrproc_t)0)
180: struct xdr_discrim {
181: int value;
182: xdrproc_t proc;
183: };
184:
185: /*
186: * In-line routines for fast encode/decode of primitve data types.
187: * Caveat emptor: these use single memory cycles to get the
188: * data from the underlying buffer, and will fail to operate
189: * properly if the data is not aligned. The standard way to use these
190: * is to say:
191: * if ((buf = XDR_INLINE(xdrs, count)) == NULL)
192: * return (FALSE);
193: * <<< macro calls >>>
194: * where ``count'' is the number of bytes of data occupied
195: * by the primitive data types.
196: *
197: * N.B. and frozen for all time: each data type here uses 4 bytes
198: * of external representation.
199: */
200: #define IXDR_GET_LONG(buf) ntohl(*buf++)
201: #define IXDR_PUT_LONG(buf, v) (*buf++ = htonl(v))
202:
203: #define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
204: #define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
205: #define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
206: #define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
207: #define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
208:
209: #define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
210: #define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
211: #define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
212: #define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
213: #define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
214:
215: /*
216: * These are the "generic" xdr routines.
217: */
218: extern bool_t xdr_void();
219: extern bool_t xdr_int();
220: extern bool_t xdr_u_int();
221: extern bool_t xdr_long();
222: extern bool_t xdr_u_long();
223: extern bool_t xdr_short();
224: extern bool_t xdr_u_short();
225: extern bool_t xdr_float();
226: extern bool_t xdr_double();
227: extern bool_t xdr_bool();
228: extern bool_t xdr_enum();
229: extern bool_t xdr_array();
230: extern bool_t xdr_bytes();
231: extern bool_t xdr_opaque();
232: extern bool_t xdr_string();
233: extern bool_t xdr_wrapstring();
234: extern bool_t xdr_union();
235: extern bool_t xdr_reference();
236:
237: /*
238: * These are the public routines for the various implementations of
239: * xdr streams.
240: */
241:
242: extern void xdrmem_create(); /* XDR using memory buffers */
243: extern void xdrstdio_create(); /* XDR using stdio library */
244: extern void xdrrec_create(); /* XDR pseudo records for tcp */
245: extern bool_t xdrrec_endofrecord(); /* make end of xdr record */
246: extern bool_t xdrrec_skiprecord(); /* move to begining of next record */
247: extern bool_t xdrrec_eof(); /* true iff no more input */
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