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glibc/sunrpc/rpc/xdr.h

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/* @(#)xdr.h 2.2 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
*/
/* @(#)xdr.h 1.19 87/04/22 SMI */
/*
* xdr.h, External Data Representation Serialization Routines.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#ifndef _RPC_XDR_H
#define _RPC_XDR_H 1
#include <features.h>
#include <sys/types.h>
#include <rpc/types.h>
/* We need FILE. */
#include <stdio.h>
__BEGIN_DECLS
/*
* XDR provides a conventional way for converting between C data
* types and an external bit-string representation. Library supplied
* routines provide for the conversion on built-in C data types. These
* routines and utility routines defined here are used to help implement
* a type encode/decode routine for each user-defined type.
*
* Each data type provides a single procedure which takes two arguments:
*
* bool_t
* xdrproc(xdrs, argresp)
* XDR *xdrs;
* <type> *argresp;
*
* xdrs is an instance of a XDR handle, to which or from which the data
* type is to be converted. argresp is a pointer to the structure to be
* converted. The XDR handle contains an operation field which indicates
* which of the operations (ENCODE, DECODE * or FREE) is to be performed.
*
* XDR_DECODE may allocate space if the pointer argresp is null. This
* data can be freed with the XDR_FREE operation.
*
* We write only one procedure per data type to make it easy
* to keep the encode and decode procedures for a data type consistent.
* In many cases the same code performs all operations on a user defined type,
* because all the hard work is done in the component type routines.
* decode as a series of calls on the nested data types.
*/
/*
* Xdr operations. XDR_ENCODE causes the type to be encoded into the
* stream. XDR_DECODE causes the type to be extracted from the stream.
* XDR_FREE can be used to release the space allocated by an XDR_DECODE
* request.
*/
enum xdr_op
{
XDR_ENCODE = 0,
XDR_DECODE = 1,
XDR_FREE = 2
};
/*
* This is the number of bytes per unit of external data.
*/
#define BYTES_PER_XDR_UNIT (4)
/*
* This only works if the above is a power of 2. But it's defined to be
* 4 by the appropriate RFCs. So it will work. And it's normally quicker
* than the old routine.
*/
#if 1
#define RNDUP(x) (((x) + BYTES_PER_XDR_UNIT - 1) & ~(BYTES_PER_XDR_UNIT - 1))
#else /* this is the old routine */
#define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
* BYTES_PER_XDR_UNIT)
#endif
/*
* The XDR handle.
* Contains operation which is being applied to the stream,
* an operations vector for the particular implementation (e.g. see xdr_mem.c),
* and two private fields for the use of the particular implementation.
*/
typedef struct XDR XDR;
struct XDR
{
enum xdr_op x_op; /* operation; fast additional param */
struct xdr_ops
{
bool_t (*x_getlong) __PMT ((XDR * __xdrs, long *__lp));
/* get a long from underlying stream */
bool_t (*x_putlong) __PMT ((XDR * __xdrs, __const long *__lp));
/* put a long to " */
bool_t (*x_getbytes) __PMT ((XDR * __xdrs, caddr_t __addr,
u_int __len));
/* get some bytes from " */
bool_t (*x_putbytes) __PMT ((XDR * __xdrs, __const char *__addr,
u_int __len));
/* put some bytes to " */
u_int (*x_getpostn) __PMT ((__const XDR * __xdrs));
/* returns bytes off from beginning */
bool_t (*x_setpostn) __PMT ((XDR * __xdrs, u_int pos));
/* lets you reposition the stream */
long *(*x_inline) __PMT ((XDR * __xdrs, int len));
/* buf quick ptr to buffered data */
void (*x_destroy) __PMT ((XDR * __xdrs));
/* free privates of this xdr_stream */
}
*x_ops;
caddr_t x_public; /* users' data */
caddr_t x_private; /* pointer to private data */
caddr_t x_base; /* private used for position info */
int x_handy; /* extra private word */
};
/*
* A xdrproc_t exists for each data type which is to be encoded or decoded.
*
* The second argument to the xdrproc_t is a pointer to an opaque pointer.
* The opaque pointer generally points to a structure of the data type
* to be decoded. If this pointer is 0, then the type routines should
* allocate dynamic storage of the appropriate size and return it.
* bool_t (*xdrproc_t)(XDR *, caddr_t *);
*/
typedef bool_t (*xdrproc_t) __PMT ((XDR *, void *,...));
/*
* Operations defined on a XDR handle
*
* XDR *xdrs;
* long *longp;
* caddr_t addr;
* u_int len;
* u_int pos;
*/
#define XDR_GETLONG(xdrs, longp) \
(*(xdrs)->x_ops->x_getlong)(xdrs, longp)
#define xdr_getlong(xdrs, longp) \
(*(xdrs)->x_ops->x_getlong)(xdrs, longp)
#define XDR_PUTLONG(xdrs, longp) \
(*(xdrs)->x_ops->x_putlong)(xdrs, longp)
#define xdr_putlong(xdrs, longp) \
(*(xdrs)->x_ops->x_putlong)(xdrs, longp)
#define XDR_GETBYTES(xdrs, addr, len) \
(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
#define xdr_getbytes(xdrs, addr, len) \
(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
#define XDR_PUTBYTES(xdrs, addr, len) \
(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
#define xdr_putbytes(xdrs, addr, len) \
(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
#define XDR_GETPOS(xdrs) \
(*(xdrs)->x_ops->x_getpostn)(xdrs)
#define xdr_getpos(xdrs) \
(*(xdrs)->x_ops->x_getpostn)(xdrs)
#define XDR_SETPOS(xdrs, pos) \
(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
#define xdr_setpos(xdrs, pos) \
(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
#define XDR_INLINE(xdrs, len) \
(*(xdrs)->x_ops->x_inline)(xdrs, len)
#define xdr_inline(xdrs, len) \
(*(xdrs)->x_ops->x_inline)(xdrs, len)
#define XDR_DESTROY(xdrs) \
if ((xdrs)->x_ops->x_destroy) \
(*(xdrs)->x_ops->x_destroy)(xdrs)
#define xdr_destroy(xdrs) \
if ((xdrs)->x_ops->x_destroy) \
(*(xdrs)->x_ops->x_destroy)(xdrs)
/*
* Support struct for discriminated unions.
* You create an array of xdrdiscrim structures, terminated with
* a entry with a null procedure pointer. The xdr_union routine gets
* the discriminant value and then searches the array of structures
* for a matching value. If a match is found the associated xdr routine
* is called to handle that part of the union. If there is
* no match, then a default routine may be called.
* If there is no match and no default routine it is an error.
*/
#define NULL_xdrproc_t ((xdrproc_t)0)
struct xdr_discrim
{
int value;
xdrproc_t proc;
};
/*
* Inline routines for fast encode/decode of primitive data types.
* Caveat emptor: these use single memory cycles to get the
* data from the underlying buffer, and will fail to operate
* properly if the data is not aligned. The standard way to use these
* is to say:
* if ((buf = XDR_INLINE(xdrs, count)) == NULL)
* return (FALSE);
* <<< macro calls >>>
* where ``count'' is the number of bytes of data occupied
* by the primitive data types.
*
* N.B. and frozen for all time: each data type here uses 4 bytes
* of external representation.
*/
#define IXDR_GET_LONG(buf) ((long)ntohl((u_long)*((u_int32_t*)buf)++))
#define IXDR_PUT_LONG(buf, v) (*((u_int32_t*)(buf))++ = (long)htonl((u_long)v))
#define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
#define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
#define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
#define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
#define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
#define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
#define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
#define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
#define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
#define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
/*
* These are the "generic" xdr routines.
* None of these can have const applied because it's not possible to
* know whether the call is a read or a write to the passed parameter
* also, the XDR structure is always updated by some of these calls.
*/
extern bool_t xdr_void __P ((void));
extern bool_t xdr_int __P ((XDR * __xdrs, int *__ip));
extern bool_t xdr_u_int __P ((XDR * __xdrs, u_int * __up));
extern bool_t xdr_long __P ((XDR * __xdrs, long *__lp));
extern bool_t xdr_u_long __P ((XDR * __xdrs, u_long * __ulp));
extern bool_t xdr_short __P ((XDR * __xdrs, short *__sp));
extern bool_t xdr_u_short __P ((XDR * __xdrs, u_short * __usp));
extern bool_t xdr_bool __P ((XDR * __xdrs, bool_t * __bp));
extern bool_t xdr_enum __P ((XDR * __xdrs, enum_t * __ep));
extern bool_t xdr_array __P ((XDR * _xdrs, caddr_t * __addrp, u_int * __sizep,
u_int __maxsize, u_int __elsize,
xdrproc_t __elproc));
extern bool_t xdr_bytes __P ((XDR * __xdrs, char **__cpp, u_int * __sizep,
u_int __maxsize));
extern bool_t xdr_opaque __P ((XDR * __xdrs, caddr_t __cp, u_int __cnt));
extern bool_t xdr_string __P ((XDR * __xdrs, char **__cpp, u_int __maxsize));
extern bool_t xdr_union __P ((XDR * __xdrs, enum_t * __dscmp, char *__unp,
__const struct xdr_discrim * __choices,
xdrproc_t dfault));
extern bool_t xdr_char __P ((XDR * __xdrs, char *__cp));
extern bool_t xdr_u_char __P ((XDR * __xdrs, u_char * __cp));
extern bool_t xdr_vector __P ((XDR * __xdrs, char *__basep, u_int __nelem,
u_int __elemsize, xdrproc_t __xdr_elem));
extern bool_t xdr_float __P ((XDR * __xdrs, float *__fp));
extern bool_t xdr_double __P ((XDR * __xdrs, double *__dp));
extern bool_t xdr_reference __P ((XDR * __xdrs, caddr_t * __xpp, u_int __size,
xdrproc_t __proc));
extern bool_t xdr_pointer __P ((XDR * __xdrs, char **__objpp,
u_int __obj_size, xdrproc_t __xdr_obj));
extern bool_t xdr_wrapstring __P ((XDR * __xdrs, char **__cpp));
extern u_long xdr_sizeof __P ((xdrproc_t, void *));
/*
* Common opaque bytes objects used by many rpc protocols;
* declared here due to commonality.
*/
#define MAX_NETOBJ_SZ 1024
struct netobj
{
u_int n_len;
char *n_bytes;
};
typedef struct netobj netobj;
extern bool_t xdr_netobj __P ((XDR * __xdrs, struct netobj * __np));
/*
* These are the public routines for the various implementations of
* xdr streams.
*/
/* XDR using memory buffers */
extern void xdrmem_create __P ((XDR * __xdrs, __const caddr_t __addr,
u_int __size, enum xdr_op __xop));
/* XDR using stdio library */
extern void xdrstdio_create __P ((XDR * __xdrs, FILE * __file,
enum xdr_op __xop));
/* XDR pseudo records for tcp */
extern void xdrrec_create __P ((XDR * __xdrs, u_int __sendsize,
u_int __recvsize, caddr_t __tcp_handle,
int (*__readit) (char *, char *, int),
int (*__writeit) (char *, char *, int)));
/* make end of xdr record */
extern bool_t xdrrec_endofrecord __P ((XDR * __xdrs, bool_t __sendnow));
/* move to beginning of next record */
extern bool_t xdrrec_skiprecord __P ((XDR * __xdrs));
/* true if no more input */
extern bool_t xdrrec_eof __P ((XDR * __xdrs));
/* free memory buffers for xdr */
extern void xdr_free __P ((xdrproc_t __proc, char *__objp));
__END_DECLS
#endif /* rpc/xdr.h */
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