138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/*
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* Copyright (c) 2009, Sun Microsystems, Inc.
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* All rights reserved.
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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 met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, 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 "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* xdr_reference.c, Generic XDR routines impelmentation.
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*
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* Copyright (C) 1987, Sun Microsystems, Inc.
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*
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* These are the "non-trivial" xdr primitives used to serialize and de-serialize
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* "pointers". See xdr.h for more info on the interface to xdr.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#include "xdr_private.h"
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#define LASTUNSIGNED ((u_int)0-1)
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/*
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* XDR an indirect pointer
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* xdr_reference is for recursively translating a structure that is
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* referenced by a pointer inside the structure that is currently being
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* translated. pp references a pointer to storage. If *pp is null
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* the necessary storage is allocated.
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* size is the sizeof the referneced structure.
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* proc is the routine to handle the referenced structure.
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*/
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bool_t
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xdr_reference (XDR * xdrs,
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caddr_t * pp,
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u_int size,
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xdrproc_t proc)
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{
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caddr_t loc = *pp;
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bool_t stat;
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if (loc == NULL)
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switch (xdrs->x_op)
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{
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case XDR_FREE:
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return TRUE;
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case XDR_DECODE:
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*pp = loc = (caddr_t) mem_alloc (size);
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if (loc == NULL)
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{
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xdr_warnx ("xdr_reference: out of memory");
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errno = ENOMEM;
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return FALSE;
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}
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memset (loc, 0, size);
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break;
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case XDR_ENCODE:
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break;
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}
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stat = (*proc) (xdrs, loc, LASTUNSIGNED);
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if (xdrs->x_op == XDR_FREE)
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{
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mem_free (loc, size);
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*pp = NULL;
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}
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return stat;
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}
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/*
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* xdr_pointer():
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*
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* XDR a pointer to a possibly recursive data structure. This
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* differs with xdr_reference in that it can serialize/deserialiaze
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* trees correctly.
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*
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* What's sent is actually a union:
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*
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* union object_pointer switch (boolean b) {
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* case TRUE: object_data data;
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* case FALSE: void nothing;
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* }
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*
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* > objpp: Pointer to the pointer to the object.
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* > obj_size: size of the object.
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* > xdr_obj: routine to XDR an object.
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*
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*/
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bool_t
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xdr_pointer (XDR * xdrs,
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char **objpp,
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u_int obj_size,
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xdrproc_t xdr_obj)
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{
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bool_t more_data;
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more_data = (*objpp != NULL);
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if (!xdr_bool (xdrs, &more_data))
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{
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return FALSE;
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}
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if (!more_data)
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{
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*objpp = NULL;
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return TRUE;
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}
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return (xdr_reference (xdrs, objpp, obj_size, xdr_obj));
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}
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