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/* $OpenBSD: xdr.h,v 1.12 2010/09/01 14:43:34 millert Exp $ */
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/* $NetBSD: xdr.h,v 1.7 1995/04/29 05:28:06 cgd Exp $ */
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/*
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* Copyright (c) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: @(#)xdr.h 1.19 87/04/22 SMI
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* @(#)xdr.h 2.2 88/07/29 4.0 RPCSRC
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*/
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/*
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* xdr.h, External Data Representation Serialization Routines.
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*/
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#ifndef _RPC_XDR_H
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#define _RPC_XDR_H
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#include <sys/cdefs.h>
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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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* 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 __rpc_xdr {
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enum xdr_op x_op; /* operation; fast additional param */
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struct xdr_ops {
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/* get a long from underlying stream */
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bool_t (*x_getlong)(struct __rpc_xdr *, long *);
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/* put a long to " */
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bool_t (*x_putlong)(struct __rpc_xdr *, long *);
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/* get some bytes from " */
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bool_t (*x_getbytes)(struct __rpc_xdr *, caddr_t,
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unsigned int);
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/* put some bytes to " */
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bool_t (*x_putbytes)(struct __rpc_xdr *, caddr_t,
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unsigned int);
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/* returns bytes off from beginning */
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unsigned int (*x_getpostn)(struct __rpc_xdr *);
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/* lets you reposition the stream */
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bool_t (*x_setpostn)(struct __rpc_xdr *, unsigned int);
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/* buf quick ptr to buffered data */
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int32_t *(*x_inline)(struct __rpc_xdr *, unsigned int);
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/* free privates of this xdr_stream */
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void (*x_destroy)(struct __rpc_xdr *);
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bool_t (*x_control)(struct __rpc_xdr *, int, void *);
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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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unsigned int x_handy; /* extra private word */
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} XDR;
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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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*
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* XXX can't actually prototype it, because some take three args!!!
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*/
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typedef bool_t (*xdrproc_t)(/* XDR *, void *, unsigned int */);
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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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* unsigned int len;
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* unsigned 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 primitive 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((unsigned long)*(buf)++))
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#define IXDR_PUT_LONG(buf, v) (*(buf)++ = (long)htonl((unsigned 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) ((unsigned 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) ((unsigned 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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__BEGIN_DECLS
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extern bool_t xdr_void(void);
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extern bool_t xdr_int(XDR *, int *);
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extern bool_t xdr_u_int(XDR *, unsigned int *);
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extern bool_t xdr_long(XDR *, long *);
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extern bool_t xdr_u_long(XDR *, unsigned long *);
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extern bool_t xdr_short(XDR *, short *);
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extern bool_t xdr_u_short(XDR *, unsigned short *);
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extern bool_t xdr_int16_t(XDR *, int16_t *);
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extern bool_t xdr_u_int16_t(XDR *, u_int16_t *);
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extern bool_t xdr_int32_t(XDR *, int32_t *);
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extern bool_t xdr_u_int32_t(XDR *, u_int32_t *);
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extern bool_t xdr_int64_t(XDR *, int64_t *);
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extern bool_t xdr_u_int64_t(XDR *, u_int64_t *);
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extern bool_t xdr_bool(XDR *, bool_t *);
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extern bool_t xdr_enum(XDR *, enum_t *);
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extern bool_t xdr_array(XDR *, char **, unsigned int *, unsigned int,
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unsigned int, xdrproc_t);
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extern bool_t xdr_bytes(XDR *, char **, unsigned int *, unsigned int);
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extern bool_t xdr_opaque(XDR *, caddr_t, unsigned int);
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extern bool_t xdr_string(XDR *, char **, unsigned int);
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extern bool_t xdr_union(XDR *, enum_t *, char *, struct xdr_discrim *,
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xdrproc_t);
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extern bool_t xdr_char(XDR *, char *);
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extern bool_t xdr_u_char(XDR *, unsigned char *);
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extern bool_t xdr_vector(XDR *, char *, unsigned int, unsigned int,
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xdrproc_t);
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extern bool_t xdr_float(XDR *, float *);
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extern bool_t xdr_double(XDR *, double *);
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extern bool_t xdr_reference(XDR *, caddr_t *, unsigned int, xdrproc_t);
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extern bool_t xdr_pointer(XDR *, caddr_t *, unsigned int, xdrproc_t);
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extern bool_t xdr_wrapstring(XDR *, char **);
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extern void xdr_free(xdrproc_t, char *);
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__END_DECLS
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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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unsigned 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(XDR *, struct 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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__BEGIN_DECLS
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/* XDR using memory buffers */
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extern void xdrmem_create(XDR *, char *, unsigned int, enum xdr_op);
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#ifdef _STDIO_H_
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/* XDR using stdio library */
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extern void xdrstdio_create(XDR *, FILE *, enum xdr_op);
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#endif
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/* XDR pseudo records for tcp */
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extern void xdrrec_create(XDR *, unsigned int, unsigned int, char *,
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int (*)(caddr_t, caddr_t, int),
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int (*)(caddr_t, caddr_t, int));
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/* make end of xdr record */
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extern bool_t xdrrec_endofrecord(XDR *, int);
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/* move to beginning of next record */
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extern bool_t xdrrec_skiprecord(XDR *);
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/* true if no more input */
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extern bool_t xdrrec_eof(XDR *);
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__END_DECLS
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#endif /* !_RPC_XDR_H */
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