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31 * xdr.h, External Data Representation Serialization Routines.
33 * Copyright (C) 1984, Sun Microsystems, Inc.
40 #include <sys/types.h>
49 * XDR provides a conventional way for converting between C data
50 * types and an external bit-string representation. Library supplied
51 * routines provide for the conversion on built-in C data types. These
52 * routines and utility routines defined here are used to help implement
53 * a type encode/decode routine for each user-defined type.
55 * Each data type provides a single procedure which takes two arguments:
58 * xdrproc(xdrs, argresp)
62 * xdrs is an instance of a XDR handle, to which or from which the data
63 * type is to be converted. argresp is a pointer to the structure to be
64 * converted. The XDR handle contains an operation field which indicates
65 * which of the operations (ENCODE, DECODE * or FREE) is to be performed.
67 * XDR_DECODE may allocate space if the pointer argresp is null. This
68 * data can be freed with the XDR_FREE operation.
70 * We write only one procedure per data type to make it easy
71 * to keep the encode and decode procedures for a data type consistent.
72 * In many cases the same code performs all operations on a user defined type,
73 * because all the hard work is done in the component type routines.
74 * decode as a series of calls on the nested data types.
78 * Xdr operations. XDR_ENCODE causes the type to be encoded into the
79 * stream. XDR_DECODE causes the type to be extracted from the stream.
80 * XDR_FREE can be used to release the space allocated by an XDR_DECODE
90 * This is the number of bytes per unit of external data.
92 #define BYTES_PER_XDR_UNIT (4)
94 * This only works if the above is a power of 2. But it's defined to be
95 * 4 by the appropriate RFCs. So it will work. And it's normally quicker
96 * than the old routine.
99 #define RNDUP(x) (((x) + BYTES_PER_XDR_UNIT - 1) & ~(BYTES_PER_XDR_UNIT - 1))
100 #else /* this is the old routine */
101 #define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
102 * BYTES_PER_XDR_UNIT)
107 * Contains operation which is being applied to the stream,
108 * an operations vector for the particular implementation (e.g. see xdr_mem.c),
109 * and two private fields for the use of the particular implementation.
111 typedef struct XDR XDR;
114 enum xdr_op x_op; /* operation; fast additional param */
117 bool_t (*x_getlong) (XDR *__xdrs, long *__lp);
118 /* get a long from underlying stream */
119 bool_t (*x_putlong) (XDR *__xdrs, __const long *__lp);
120 /* put a long to " */
121 bool_t (*x_getbytes) (XDR *__xdrs, caddr_t __addr, u_int __len);
122 /* get some bytes from " */
123 bool_t (*x_putbytes) (XDR *__xdrs, __const char *__addr, u_int __len);
124 /* put some bytes to " */
125 u_int (*x_getpostn) (__const XDR *__xdrs);
126 /* returns bytes off from beginning */
127 bool_t (*x_setpostn) (XDR *__xdrs, u_int __pos);
128 /* lets you reposition the stream */
129 int32_t *(*x_inline) (XDR *__xdrs, u_int __len);
130 /* buf quick ptr to buffered data */
131 void (*x_destroy) (XDR *__xdrs);
132 /* free privates of this xdr_stream */
133 bool_t (*x_getint32) (XDR *__xdrs, int32_t *__ip);
134 /* get a int from underlying stream */
135 bool_t (*x_putint32) (XDR *__xdrs, __const int32_t *__ip);
139 caddr_t x_public; /* users' data */
140 caddr_t x_private; /* pointer to private data */
141 caddr_t x_base; /* private used for position info */
142 u_int x_handy; /* extra private word */
146 * A xdrproc_t exists for each data type which is to be encoded or decoded.
148 * The second argument to the xdrproc_t is a pointer to an opaque pointer.
149 * The opaque pointer generally points to a structure of the data type
150 * to be decoded. If this pointer is 0, then the type routines should
151 * allocate dynamic storage of the appropriate size and return it.
152 * bool_t (*xdrproc_t)(XDR *, caddr_t *);
154 typedef bool_t (*xdrproc_t) (XDR *, void *,...);
158 * Operations defined on a XDR handle
167 #define XDR_GETINT32(xdrs, int32p) \
168 (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
169 #define xdr_getint32(xdrs, int32p) \
170 (*(xdrs)->x_ops->x_getint32)(xdrs, int32p)
172 #define XDR_PUTINT32(xdrs, int32p) \
173 (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
174 #define xdr_putint32(xdrs, int32p) \
175 (*(xdrs)->x_ops->x_putint32)(xdrs, int32p)
177 #define XDR_GETLONG(xdrs, longp) \
178 (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
179 #define xdr_getlong(xdrs, longp) \
180 (*(xdrs)->x_ops->x_getlong)(xdrs, longp)
182 #define XDR_PUTLONG(xdrs, longp) \
183 (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
184 #define xdr_putlong(xdrs, longp) \
185 (*(xdrs)->x_ops->x_putlong)(xdrs, longp)
187 #define XDR_GETBYTES(xdrs, addr, len) \
188 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
189 #define xdr_getbytes(xdrs, addr, len) \
190 (*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
192 #define XDR_PUTBYTES(xdrs, addr, len) \
193 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
194 #define xdr_putbytes(xdrs, addr, len) \
195 (*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
197 #define XDR_GETPOS(xdrs) \
198 (*(xdrs)->x_ops->x_getpostn)(xdrs)
199 #define xdr_getpos(xdrs) \
200 (*(xdrs)->x_ops->x_getpostn)(xdrs)
202 #define XDR_SETPOS(xdrs, pos) \
203 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
204 #define xdr_setpos(xdrs, pos) \
205 (*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
207 #define XDR_INLINE(xdrs, len) \
208 (*(xdrs)->x_ops->x_inline)(xdrs, len)
209 #define xdr_inline(xdrs, len) \
210 (*(xdrs)->x_ops->x_inline)(xdrs, len)
212 #define XDR_DESTROY(xdrs) \
214 if ((xdrs)->x_ops->x_destroy) \
215 (*(xdrs)->x_ops->x_destroy)(xdrs); \
217 #define xdr_destroy(xdrs) \
219 if ((xdrs)->x_ops->x_destroy) \
220 (*(xdrs)->x_ops->x_destroy)(xdrs); \
224 * Support struct for discriminated unions.
225 * You create an array of xdrdiscrim structures, terminated with
226 * a entry with a null procedure pointer. The xdr_union routine gets
227 * the discriminant value and then searches the array of structures
228 * for a matching value. If a match is found the associated xdr routine
229 * is called to handle that part of the union. If there is
230 * no match, then a default routine may be called.
231 * If there is no match and no default routine it is an error.
233 #define NULL_xdrproc_t ((xdrproc_t)0)
241 * Inline routines for fast encode/decode of primitive data types.
242 * Caveat emptor: these use single memory cycles to get the
243 * data from the underlying buffer, and will fail to operate
244 * properly if the data is not aligned. The standard way to use these
246 * if ((buf = XDR_INLINE(xdrs, count)) == NULL)
248 * <<< macro calls >>>
249 * where ``count'' is the number of bytes of data occupied
250 * by the primitive data types.
252 * N.B. and frozen for all time: each data type here uses 4 bytes
253 * of external representation.
256 #define IXDR_GET_INT32(buf) ((int32_t)ntohl((uint32_t)*(buf)++))
257 #define IXDR_PUT_INT32(buf, v) (*(buf)++ = (int32_t)htonl((uint32_t)(v)))
258 #define IXDR_GET_U_INT32(buf) ((uint32_t)IXDR_GET_INT32(buf))
259 #define IXDR_PUT_U_INT32(buf, v) IXDR_PUT_INT32(buf, (int32_t)(v))
261 /* WARNING: The IXDR_*_LONG defines are removed by Sun for new platforms
262 * and shouldn't be used any longer. Code which use this defines or longs
263 * in the RPC code will not work on 64bit Solaris platforms !
265 #define IXDR_GET_LONG(buf) ((long)IXDR_GET_U_INT32(buf))
266 #define IXDR_PUT_LONG(buf, v) ((long)IXDR_PUT_INT32(buf, (long)(v)))
267 #define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
268 #define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG(buf, (long)(v))
271 #define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
272 #define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
273 #define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
274 #define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
276 #define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG(buf, (long)(v))
277 #define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG(buf, (long)(v))
278 #define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
279 #define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG(buf, (long)(v))
282 * These are the "generic" xdr routines.
283 * None of these can have const applied because it's not possible to
284 * know whether the call is a read or a write to the passed parameter
285 * also, the XDR structure is always updated by some of these calls.
287 extern bool_t xdr_void (void) __THROW;
288 extern bool_t xdr_short (XDR *__xdrs, short *__sp) __THROW;
289 extern bool_t xdr_u_short (XDR *__xdrs, u_short *__usp) __THROW;
290 extern bool_t xdr_int (XDR *__xdrs, int *__ip) __THROW;
291 extern bool_t xdr_u_int (XDR *__xdrs, u_int *__up) __THROW;
292 extern bool_t xdr_long (XDR *__xdrs, long *__lp) __THROW;
293 extern bool_t xdr_u_long (XDR *__xdrs, u_long *__ulp) __THROW;
294 extern bool_t xdr_hyper (XDR *__xdrs, quad_t *__llp) __THROW;
295 extern bool_t xdr_u_hyper (XDR *__xdrs, u_quad_t *__ullp) __THROW;
296 extern bool_t xdr_longlong_t (XDR *__xdrs, quad_t *__llp) __THROW;
297 extern bool_t xdr_u_longlong_t (XDR *__xdrs, u_quad_t *__ullp) __THROW;
298 extern bool_t xdr_int8_t (XDR *__xdrs, int8_t *__ip) __THROW;
299 extern bool_t xdr_uint8_t (XDR *__xdrs, uint8_t *__up) __THROW;
300 extern bool_t xdr_int16_t (XDR *__xdrs, int16_t *__ip) __THROW;
301 extern bool_t xdr_uint16_t (XDR *__xdrs, uint16_t *__up) __THROW;
302 extern bool_t xdr_int32_t (XDR *__xdrs, int32_t *__ip) __THROW;
303 extern bool_t xdr_uint32_t (XDR *__xdrs, uint32_t *__up) __THROW;
304 extern bool_t xdr_int64_t (XDR *__xdrs, int64_t *__ip) __THROW;
305 extern bool_t xdr_uint64_t (XDR *__xdrs, uint64_t *__up) __THROW;
306 extern bool_t xdr_quad_t (XDR *__xdrs, quad_t *__ip) __THROW;
307 extern bool_t xdr_u_quad_t (XDR *__xdrs, u_quad_t *__up) __THROW;
308 extern bool_t xdr_bool (XDR *__xdrs, bool_t *__bp) __THROW;
309 extern bool_t xdr_enum (XDR *__xdrs, enum_t *__ep) __THROW;
310 extern bool_t xdr_array (XDR * _xdrs, caddr_t *__addrp, u_int *__sizep,
311 u_int __maxsize, u_int __elsize, xdrproc_t __elproc)
313 extern bool_t xdr_bytes (XDR *__xdrs, char **__cpp, u_int *__sizep,
314 u_int __maxsize) __THROW;
315 extern bool_t xdr_opaque (XDR *__xdrs, caddr_t __cp, u_int __cnt) __THROW;
316 extern bool_t xdr_string (XDR *__xdrs, char **__cpp, u_int __maxsize) __THROW;
317 extern bool_t xdr_union (XDR *__xdrs, enum_t *__dscmp, char *__unp,
318 __const struct xdr_discrim *__choices,
319 xdrproc_t dfault) __THROW;
320 extern bool_t xdr_char (XDR *__xdrs, char *__cp) __THROW;
321 extern bool_t xdr_u_char (XDR *__xdrs, u_char *__cp) __THROW;
322 extern bool_t xdr_vector (XDR *__xdrs, char *__basep, u_int __nelem,
323 u_int __elemsize, xdrproc_t __xdr_elem) __THROW;
324 extern bool_t xdr_float (XDR *__xdrs, float *__fp) __THROW;
325 extern bool_t xdr_double (XDR *__xdrs, double *__dp) __THROW;
326 extern bool_t xdr_reference (XDR *__xdrs, caddr_t *__xpp, u_int __size,
327 xdrproc_t __proc) __THROW;
328 extern bool_t xdr_pointer (XDR *__xdrs, char **__objpp,
329 u_int __obj_size, xdrproc_t __xdr_obj) __THROW;
330 extern bool_t xdr_wrapstring (XDR *__xdrs, char **__cpp) __THROW;
331 extern u_long xdr_sizeof (xdrproc_t, void *) __THROW;
334 * Common opaque bytes objects used by many rpc protocols;
335 * declared here due to commonality.
337 #define MAX_NETOBJ_SZ 1024
343 typedef struct netobj netobj;
344 extern bool_t xdr_netobj (XDR *__xdrs, struct netobj *__np) __THROW;
347 * These are the public routines for the various implementations of
351 /* XDR using memory buffers */
352 extern void xdrmem_create (XDR *__xdrs, __const caddr_t __addr,
353 u_int __size, enum xdr_op __xop) __THROW;
355 /* XDR using stdio library */
356 extern void xdrstdio_create (XDR *__xdrs, FILE *__file, enum xdr_op __xop)
359 /* XDR pseudo records for tcp */
360 extern void xdrrec_create (XDR *__xdrs, u_int __sendsize,
361 u_int __recvsize, caddr_t __tcp_handle,
362 int (*__readit) (char *, char *, int),
363 int (*__writeit) (char *, char *, int)) __THROW;
365 /* make end of xdr record */
366 extern bool_t xdrrec_endofrecord (XDR *__xdrs, bool_t __sendnow) __THROW;
368 /* move to beginning of next record */
369 extern bool_t xdrrec_skiprecord (XDR *__xdrs) __THROW;
371 /* true if no more input */
372 extern bool_t xdrrec_eof (XDR *__xdrs) __THROW;
374 /* free memory buffers for xdr */
375 extern void xdr_free (xdrproc_t __proc, char *__objp) __THROW;
379 #endif /* rpc/xdr.h */