/*
* 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
*
* from: @(#)xdr.h 1.19 87/04/22 SMI
* @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC
*/
/*
* xdr.h, External Data Representation Serialization Routines.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
/*
* 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)
#define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
* BYTES_PER_XDR_UNIT)
/*
* 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 __rpc_xdr {
enum xdr_op x_op; /* operation; fast additional param */
const struct xdr_ops {
/* get a long from underlying stream */
bool_t (*x_getlong)(struct __rpc_xdr *, long *);
/* put a long to " */
bool_t (*x_putlong)(struct __rpc_xdr *, const long *);
/* get some bytes from " */
bool_t (*x_getbytes)(struct __rpc_xdr *, char *, unsigned int);
/* put some bytes to " */
bool_t (*x_putbytes)(struct __rpc_xdr *, const char *,
unsigned int);
/* returns bytes off from beginning */
unsigned (*x_getpostn)(struct __rpc_xdr *);
/* lets you reposition the stream */
bool_t (*x_setpostn)(struct __rpc_xdr *, unsigned int);
/* buf quick ptr to buffered data */
int32_t *(*x_inline)(struct __rpc_xdr *, unsigned int);
/* free privates of this xdr_stream */
void (*x_destroy)(struct __rpc_xdr *);
bool_t (*x_control)(struct __rpc_xdr *, int, void *);
} *x_ops;
char * x_public; /* users' data */
void * x_private; /* pointer to private data */
char * x_base; /* private used for position info */
unsigned int x_handy; /* extra private word */
} XDR;
/*
* 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.
*/
typedef bool_t (*xdrproc_t)(XDR *, const void *);
/*
* Operations defined on a XDR handle
*
* XDR *xdrs;
* long *longp;
* char * addr;
* unsigned len;
* unsigned 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)
/*
* 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;
};
/*
* In-line 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 (0);
* <<< 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_INT32(buf) ((int32_t)ntohl((uint32_t)*(buf)++))
#define IXDR_PUT_INT32(buf, v) (*(buf)++ =(int32_t)htonl((uint32_t)v))
#define IXDR_GET_U_INT32(buf) ((uint32_t)IXDR_GET_INT32(buf))
#define IXDR_PUT_U_INT32(buf, v) IXDR_PUT_INT32((buf), ((int32_t)(v)))
/*
* These are the public routines for the various implementations of
* xdr streams.
*/
__BEGIN_DECLS
/* XDR using memory buffers */
extern void xdrmem_create(XDR *, char *, unsigned int, enum xdr_op);
