271 lines
9.2 KiB
C
271 lines
9.2 KiB
C
/* @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC */
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/*
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* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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* unrestricted use provided that this legend is included on all tape
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* media and as a part of the software program in whole or part. Users
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* may copy or modify Sun RPC without charge, but are not authorized
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* to license or distribute it to anyone else except as part of a product or
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* program developed by the user.
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*
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* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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*
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* Sun RPC is provided with no support and without any obligation on the
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* part of Sun Microsystems, Inc. to assist in its use, correction,
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* modification or enhancement.
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*
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* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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* OR ANY PART THEREOF.
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*
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* In no event will Sun Microsystems, Inc. be liable for any lost revenue
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* or profits or other special, indirect and consequential damages, even if
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* Sun has been advised of the possibility of such damages.
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*
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* Sun Microsystems, Inc.
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* 2550 Garcia Avenue
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* Mountain View, California 94043
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*/
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/* @(#)xdr.h 1.19 87/04/22 SMI */
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/*
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* xdr.h, External Data Representation Serialization Routines.
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*
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* Copyright (C) 1984, Sun Microsystems, Inc.
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*/
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#ifndef __XDR_HEADER__
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#define __XDR_HEADER__
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/*
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* XDR provides a conventional way for converting between C data
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* types and an external bit-string representation. Library supplied
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* routines provide for the conversion on built-in C data types. These
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* routines and utility routines defined here are used to help implement
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* a type encode/decode routine for each user-defined type.
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*
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* Each data type provides a single procedure which takes two arguments:
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*
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* bool_t
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* xdrproc(xdrs, argresp)
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* XDR *xdrs;
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* <type> *argresp;
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*
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* xdrs is an instance of a XDR handle, to which or from which the data
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* type is to be converted. argresp is a pointer to the structure to be
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* converted. The XDR handle contains an operation field which indicates
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* which of the operations (ENCODE, DECODE * or FREE) is to be performed.
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*
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* XDR_DECODE may allocate space if the pointer argresp is null. This
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* data can be freed with the XDR_FREE operation.
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*
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* We write only one procedure per data type to make it easy
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* to keep the encode and decode procedures for a data type consistent.
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* In many cases the same code performs all operations on a user defined type,
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* because all the hard work is done in the component type routines.
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* decode as a series of calls on the nested data types.
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*/
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/*
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* Xdr operations. XDR_ENCODE causes the type to be encoded into the
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* stream. XDR_DECODE causes the type to be extracted from the stream.
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* XDR_FREE can be used to release the space allocated by an XDR_DECODE
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* request.
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*/
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enum xdr_op {
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XDR_ENCODE=0,
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XDR_DECODE=1,
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XDR_FREE=2
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};
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/*
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* This is the number of bytes per unit of external data.
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*/
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#define BYTES_PER_XDR_UNIT (4)
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#define RNDUP(x) ((((x) + BYTES_PER_XDR_UNIT - 1) / BYTES_PER_XDR_UNIT) \
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* BYTES_PER_XDR_UNIT)
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/*
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* A xdrproc_t exists for each data type which is to be encoded or decoded.
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*
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* The second argument to the xdrproc_t is a pointer to an opaque pointer.
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* The opaque pointer generally points to a structure of the data type
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* to be decoded. If this pointer is 0, then the type routines should
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* allocate dynamic storage of the appropriate size and return it.
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* bool_t (*xdrproc_t)(XDR *, caddr_t *);
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*/
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typedef bool_t (*xdrproc_t)();
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/*
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* The XDR handle.
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* Contains operation which is being applied to the stream,
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* an operations vector for the paticular implementation (e.g. see xdr_mem.c),
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* and two private fields for the use of the particular impelementation.
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*/
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typedef struct {
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enum xdr_op x_op; /* operation; fast additional param */
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struct xdr_ops {
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bool_t (*x_getlong)(); /* get a long from underlying stream */
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bool_t (*x_putlong)(); /* put a long to " */
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bool_t (*x_getbytes)();/* get some bytes from " */
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bool_t (*x_putbytes)();/* put some bytes to " */
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u_int (*x_getpostn)();/* returns bytes off from beginning */
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bool_t (*x_setpostn)();/* lets you reposition the stream */
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long * (*x_inline)(); /* buf quick ptr to buffered data */
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void (*x_destroy)(); /* free privates of this xdr_stream */
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} *x_ops;
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caddr_t x_public; /* users' data */
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caddr_t x_private; /* pointer to private data */
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caddr_t x_base; /* private used for position info */
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int x_handy; /* extra private word */
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} XDR;
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/*
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* Operations defined on a XDR handle
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*
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* XDR *xdrs;
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* long *longp;
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* caddr_t addr;
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* u_int len;
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* u_int pos;
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*/
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#define XDR_GETLONG(xdrs, longp) \
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(*(xdrs)->x_ops->x_getlong)(xdrs, longp)
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#define xdr_getlong(xdrs, longp) \
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(*(xdrs)->x_ops->x_getlong)(xdrs, longp)
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#define XDR_PUTLONG(xdrs, longp) \
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(*(xdrs)->x_ops->x_putlong)(xdrs, longp)
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#define xdr_putlong(xdrs, longp) \
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(*(xdrs)->x_ops->x_putlong)(xdrs, longp)
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#define XDR_GETBYTES(xdrs, addr, len) \
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(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
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#define xdr_getbytes(xdrs, addr, len) \
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(*(xdrs)->x_ops->x_getbytes)(xdrs, addr, len)
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#define XDR_PUTBYTES(xdrs, addr, len) \
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(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
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#define xdr_putbytes(xdrs, addr, len) \
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(*(xdrs)->x_ops->x_putbytes)(xdrs, addr, len)
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#define XDR_GETPOS(xdrs) \
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(*(xdrs)->x_ops->x_getpostn)(xdrs)
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#define xdr_getpos(xdrs) \
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(*(xdrs)->x_ops->x_getpostn)(xdrs)
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#define XDR_SETPOS(xdrs, pos) \
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(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
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#define xdr_setpos(xdrs, pos) \
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(*(xdrs)->x_ops->x_setpostn)(xdrs, pos)
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#define XDR_INLINE(xdrs, len) \
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(*(xdrs)->x_ops->x_inline)(xdrs, len)
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#define xdr_inline(xdrs, len) \
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(*(xdrs)->x_ops->x_inline)(xdrs, len)
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#define XDR_DESTROY(xdrs) \
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if ((xdrs)->x_ops->x_destroy) \
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(*(xdrs)->x_ops->x_destroy)(xdrs)
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#define xdr_destroy(xdrs) \
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if ((xdrs)->x_ops->x_destroy) \
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(*(xdrs)->x_ops->x_destroy)(xdrs)
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/*
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* Support struct for discriminated unions.
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* You create an array of xdrdiscrim structures, terminated with
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* a entry with a null procedure pointer. The xdr_union routine gets
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* the discriminant value and then searches the array of structures
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* for a matching value. If a match is found the associated xdr routine
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* is called to handle that part of the union. If there is
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* no match, then a default routine may be called.
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* If there is no match and no default routine it is an error.
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*/
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#define NULL_xdrproc_t ((xdrproc_t)0)
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struct xdr_discrim {
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int value;
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xdrproc_t proc;
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};
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/*
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* In-line routines for fast encode/decode of primitve data types.
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* Caveat emptor: these use single memory cycles to get the
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* data from the underlying buffer, and will fail to operate
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* properly if the data is not aligned. The standard way to use these
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* is to say:
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* if ((buf = XDR_INLINE(xdrs, count)) == NULL)
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* return (FALSE);
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* <<< macro calls >>>
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* where ``count'' is the number of bytes of data occupied
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* by the primitive data types.
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*
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* N.B. and frozen for all time: each data type here uses 4 bytes
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* of external representation.
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*/
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#define IXDR_GET_LONG(buf) ((long)ntohl((u_long)*(buf)++))
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#define IXDR_PUT_LONG(buf, v) (*(buf)++ = (long)htonl((u_long)v))
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#define IXDR_GET_BOOL(buf) ((bool_t)IXDR_GET_LONG(buf))
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#define IXDR_GET_ENUM(buf, t) ((t)IXDR_GET_LONG(buf))
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#define IXDR_GET_U_LONG(buf) ((u_long)IXDR_GET_LONG(buf))
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#define IXDR_GET_SHORT(buf) ((short)IXDR_GET_LONG(buf))
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#define IXDR_GET_U_SHORT(buf) ((u_short)IXDR_GET_LONG(buf))
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#define IXDR_PUT_BOOL(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
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#define IXDR_PUT_ENUM(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
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#define IXDR_PUT_U_LONG(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
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#define IXDR_PUT_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
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#define IXDR_PUT_U_SHORT(buf, v) IXDR_PUT_LONG((buf), ((long)(v)))
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/*
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* These are the "generic" xdr routines.
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*/
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extern bool_t xdr_void();
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extern bool_t xdr_int();
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extern bool_t xdr_u_int();
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extern bool_t xdr_long();
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extern bool_t xdr_u_long();
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extern bool_t xdr_short();
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extern bool_t xdr_u_short();
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extern bool_t xdr_bool();
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extern bool_t xdr_enum();
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extern bool_t xdr_array();
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extern bool_t xdr_bytes();
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extern bool_t xdr_opaque();
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extern bool_t xdr_string();
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extern bool_t xdr_union();
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extern bool_t xdr_char();
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extern bool_t xdr_u_char();
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extern bool_t xdr_vector();
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extern bool_t xdr_float();
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extern bool_t xdr_double();
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extern bool_t xdr_reference();
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extern bool_t xdr_pointer();
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extern bool_t xdr_wrapstring();
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/*
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* Common opaque bytes objects used by many rpc protocols;
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* declared here due to commonality.
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*/
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#define MAX_NETOBJ_SZ 1024
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struct netobj {
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u_int n_len;
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char *n_bytes;
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};
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typedef struct netobj netobj;
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extern bool_t xdr_netobj();
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/*
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* These are the public routines for the various implementations of
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* xdr streams.
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*/
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extern void xdrmem_create(); /* XDR using memory buffers */
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extern void xdrstdio_create(); /* XDR using stdio library */
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extern void xdrrec_create(); /* XDR pseudo records for tcp */
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extern bool_t xdrrec_endofrecord(); /* make end of xdr record */
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extern bool_t xdrrec_skiprecord(); /* move to beginning of next record */
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extern bool_t xdrrec_eof(); /* true if no more input */
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#endif !__XDR_HEADER__
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