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xdr.h
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C/C++ Source or Header
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1995-04-07
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11KB
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283 lines
#ifndef RPC_XDR_H
#define RPC_XDR_H
/*
* $Id: xdr.h,v 4.1 1994/09/26 08:07:59 jraja Exp jraja $
*
* External Data Representation Serialization Routines.
*
* Copyright © 1994 AmiTCP/IP Group,
* Network Solutions Development Inc.
* All rights reserved.
*
*/
/* @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC */
/* @(#)xdr.h 1.19 87/04/22 SMI */
/*
* Copyright (C) 1984, Sun Microsystems, Inc.
*/
#include <stdio.h> /* for the FILE* */
/*
* 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 paticular implementation (e.g. see xdr_mem.c),
* and two private fields for the use of the particular impelementation.
*/
typedef struct XDR {
enum xdr_op x_op; /* operation; fast additional param */
struct xdr_ops {
bool_t (*x_getlong)(struct XDR *xdrs, long *longp); /* get a long from underlying stream */
bool_t (*x_putlong)(struct XDR *xdrs, long *longp); /* put a long to " */
bool_t (*x_getbytes)(struct XDR *xdrs, caddr_t addr,
u_int len);/* get some bytes from " */
bool_t (*x_putbytes)(struct XDR *xdrs, caddr_t addr,
u_int len);/* put some bytes to " */
u_int (*x_getpostn)(struct XDR *xdrs);/* returns bytes off from beginning */
bool_t (*x_setpostn)(struct XDR *xdrs, u_int pos);/* lets you reposition the stream */
long * (*x_inline)(struct XDR *xdrs, u_int len);/* buf quick ptr to buffered data */
void (*x_destroy)(struct 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 */
} 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.
* bool_t (*xdrproc_t)(XDR *, caddr_t *);
*/
typedef bool_t (* XDRFUN xdrproc_t)(XDR *, void *);
/*
* xdr_string_t is for type casts in cases where a xdr function is called
* via a pointer. If the function happens to be xdr_string(), then it uses
* the last argument, which is passed as UINT_MAX, othervice the u_int is
* just ignored.
*/
typedef bool_t (* XDRFUN xdr_string_t)(XDR *, void *, u_int);
/*
* 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;
};
/*
* In-line routines for fast encode/decode of primitve 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)*(buf)++))
#define IXDR_PUT_LONG(buf, v) (*(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)))
/*
* Function to free memory allocated by an xdr object
*/
void xdr_free(xdrproc_t proc, void * objp);
/*
* These are the "generic" xdr routines.
*/
extern bool_t XDRFUN xdr_void(XDR * xdrs, void * dummy);
extern bool_t XDRFUN xdr_int(XDR * xdrs, int * ip);
extern bool_t XDRFUN xdr_u_int(XDR * xdrs, u_int * uip);
extern bool_t XDRFUN xdr_long(XDR * xdrs, long * lp);
extern bool_t XDRFUN xdr_u_long(XDR * xdrs, u_long * ulp);
extern bool_t XDRFUN xdr_short(XDR * xdrs, short * sp);
extern bool_t XDRFUN xdr_u_short(XDR * xdrs, u_short * usp);
extern bool_t XDRFUN xdr_bool(XDR * xdrs, bool_t * bp);
extern bool_t XDRFUN xdr_enum(XDR * xdrs, enum_t * ep);
extern bool_t XDRFUN xdr_array(XDR * xdrs, caddr_t * addrp,
u_int * sizep, u_int maxsize,
u_int elsize, xdrproc_t elproc);
extern bool_t XDRFUN xdr_bytes(XDR * xdrs, char ** cpp, u_int * sizep,
u_int maxsize);
extern bool_t XDRFUN xdr_opaque(XDR * xdrs, caddr_t cp, u_int cnt);
extern bool_t XDRFUN xdr_string(XDR * xdrs, char ** cpp, u_int maxsize);
extern bool_t XDRFUN xdr_union(XDR * xdrs, int * dscmp, char * unp,
struct xdr_discrim * choices,
xdrproc_t dfault);
extern bool_t XDRFUN xdr_char(XDR * xdrs, char * cp);
extern bool_t XDRFUN xdr_u_char(XDR * xdrs, u_char * ucp);
extern bool_t XDRFUN xdr_vector(XDR * xdrs, char * basep, u_int nelem,
u_int elemsize, xdrproc_t xdr_elem);
extern bool_t XDRFUN xdr_float(XDR *xdrs, float *fp);
extern bool_t XDRFUN xdr_double(XDR *xdrs, double *dp);
extern bool_t XDRFUN xdr_reference(XDR * xdrs, caddr_t * pp, u_int size,
xdrproc_t proc);
extern bool_t XDRFUN xdr_pointer(XDR * xdrs, char ** objpp,
u_int obj_size, xdrproc_t xdr_obj);
extern bool_t XDRFUN xdr_wrapstring(XDR * xdrs, char ** cpp);
/*
* 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 XDRFUN xdr_netobj(XDR * xdrs, struct netobj * np);
/*
* These are the public routines for the various implementations of
* xdr streams.
*/
extern void xdrmem_create(XDR * xdrs, caddr_t addr, u_int size,
enum xdr_op op); /* XDR using memory buffers */
#ifdef USE_DOSIO
extern void xdrstdio_create(XDR * xdrs, BPTR file,
enum xdr_op op); /* XDR using stdio library */
#else
extern void xdrstdio_create(XDR * xdrs, FILE * file,
enum xdr_op op); /* XDR using stdio library */
#endif
extern void xdrrec_create(XDR * xdrs, u_int sendsize, u_int recvsize,
void * tcp_handle,
int (* readit)(void *, caddr_t, int),
int (* writeit)(void *, caddr_t, int)); /* XDR pseudo records for tcp */
extern bool_t xdrrec_endofrecord(XDR * xdrs, int sendnow);/* make end of xdr record */
extern bool_t xdrrec_skiprecord(XDR * xdrs);/* move to beginning of next record */
extern bool_t xdrrec_eof(XDR * xdrs); /* true if no more input */
#endif /* !RPC_XDR_H */