xdr.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static char *sccsid = "@(#)xdr.c	4.1      ULTRIX  7/3/90";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1986 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*
 *	Portions of this software have been licensed to 
 *	Digital Equipment Company, Maynard, MA.
 *	Copyright (c) 1986 Sun Microsystems, Inc.  ALL RIGHTS RESERVED.
 */
/*	Change Log
 *	04/13/89	jhw 	picked up SUN 4.0 changes
 */

/*
 * xdr.c, Generic XDR routines implementation.
 *
 *
 * These are the "generic" xdr routines used to serialize and de-serialize
 * most common data items.  See xdr.h for more info on the interface to
 * xdr.
 */

#ifdef KERNEL
#include "../h/param.h"
#include "../h/systm.h"
#include "../rpc/types.h"
#include "../rpc/xdr.h"
#else
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <stdio.h>
char *malloc();
#endif

/*
 * constants specific to the xdr "protocol"
 */
#define XDR_FALSE	((long) 0)
#define XDR_TRUE	((long) 1)
#define LASTUNSIGNED	((u_int) 0-1)

/*
 * for unit alignment
 */
static char xdr_zero[BYTES_PER_XDR_UNIT] = { 0, 0, 0, 0 };

#ifndef KERNEL
/*
 * Free a data structure using XDR
 * Not a filter, but a convenient utility nonetheless
 */
void
xdr_free(proc, objp)
        xdrproc_t proc;
        char *objp;
{
        XDR x;

        x.x_op = XDR_FREE;
        (*proc)(&x, objp);
}
#endif

/*
 * XDR nothing
 */
bool_t
xdr_void(/* xdrs, addr */)
	/* XDR *xdrs; */
	/* caddr_t addr; */
{

	return (TRUE);
}

/*
 * XDR integers
 */
bool_t
xdr_int(xdrs, ip)
	XDR *xdrs;
	int *ip;
{

#ifdef lint
	(void) (xdr_short(xdrs, (short *)ip));
	return (xdr_long(xdrs, (long *)ip));
#else
	if (sizeof (int) == sizeof (long)) {
		return (xdr_long(xdrs, (long *)ip));
	} else {
		return (xdr_short(xdrs, (short *)ip));
	}
#endif
}

/*
 * XDR unsigned integers
 */
bool_t
xdr_u_int(xdrs, up)
	XDR *xdrs;
	u_int *up;
{

#ifdef lint
	(void) (xdr_short(xdrs, (short *)up));
	return (xdr_u_long(xdrs, (u_long *)up));
#else
	if (sizeof (u_int) == sizeof (u_long)) {
		return (xdr_u_long(xdrs, (u_long *)up));
	} else {
		return (xdr_short(xdrs, (short *)up));
	}
#endif
}

/*
 * XDR long integers
 * same as xdr_u_long - open coded to save a proc call!
 */
bool_t
xdr_long(xdrs, lp)
	register XDR *xdrs;
	long *lp;
{

	if (xdrs->x_op == XDR_ENCODE)
		return (XDR_PUTLONG(xdrs, lp));

	if (xdrs->x_op == XDR_DECODE)
		return (XDR_GETLONG(xdrs, lp));

	if (xdrs->x_op == XDR_FREE)
		return (TRUE);

#ifdef KERNEL
	printf("xdr_long: FAILED\n");
#endif
	return (FALSE);
}

/*
 * XDR unsigned long integers
 * same as xdr_long - open coded to save a proc call!
 */
bool_t
xdr_u_long(xdrs, ulp)
	register XDR *xdrs;
	u_long *ulp;
{

	if (xdrs->x_op == XDR_DECODE)
		return (XDR_GETLONG(xdrs, (long *)ulp));
	if (xdrs->x_op == XDR_ENCODE)
		return (XDR_PUTLONG(xdrs, (long *)ulp));
	if (xdrs->x_op == XDR_FREE)
		return (TRUE);
#ifdef KERNEL
	printf("xdr_u_long: FAILED\n");
#endif
	return (FALSE);
}

/*
 * XDR short integers
 */
bool_t
xdr_short(xdrs, sp)
	register XDR *xdrs;
	short *sp;
{
	long l;

	switch (xdrs->x_op) {

	case XDR_ENCODE:
		l = (long) *sp;
		return (XDR_PUTLONG(xdrs, &l));

	case XDR_DECODE:
		if (!XDR_GETLONG(xdrs, &l)) {
			return (FALSE);
		}
		*sp = (short) l;
		return (TRUE);

	case XDR_FREE:
		return (TRUE);
	}
	return (FALSE);
}

/*
 * XDR unsigned short integers
 */
bool_t
xdr_u_short(xdrs, usp)
	register XDR *xdrs;
	u_short *usp;
{
	u_long l;

	switch (xdrs->x_op) {

	case XDR_ENCODE:
		l = (u_long) *usp;
		return (XDR_PUTLONG(xdrs, &l));

	case XDR_DECODE:
		if (!XDR_GETLONG(xdrs, &l)) {
#ifdef KERNEL
			printf("xdr_u_short: decode FAILED\n");
#endif
			return (FALSE);
		}
		*usp = (u_short) l;
		return (TRUE);

	case XDR_FREE:
		return (TRUE);
	}
#ifdef KERNEL
	printf("xdr_u_short: bad op FAILED\n");
#endif
	return (FALSE);
}

/* xdr_char, xdr_u_char taken from
 *	abyss: /usr/arch/sun/dfs/nfs.3.2a/lib/libc/rpc/xdr.c
 */
#ifndef KERNEL
/*
 * XDR a char
 */
bool_t
xdr_char(xdrs, cp)
	XDR *xdrs;
	char *cp;
{
	int i;

	i = (*cp);
	if (!xdr_int(xdrs, &i)) {
		return (FALSE);
	}
	*cp = i;
	return (TRUE);
}

/*
 * XDR an unsigned char
 */
bool_t
xdr_u_char(xdrs, cp)
	XDR *xdrs;
	char *cp;
{
	u_int u;

	u = (*cp);
	if (!xdr_u_int(xdrs, &u)) {
		return (FALSE);
	}
	*cp = u;
	return (TRUE);
}
#endif /* !KERNEL */

/*
 * XDR booleans
 */
bool_t
xdr_bool(xdrs, bp)
	register XDR *xdrs;
	bool_t *bp;
{
	long lb;

	switch (xdrs->x_op) {

	case XDR_ENCODE:
		lb = *bp ? XDR_TRUE : XDR_FALSE;
		return (XDR_PUTLONG(xdrs, &lb));

	case XDR_DECODE:
		if (!XDR_GETLONG(xdrs, &lb)) {
#ifdef KERNEL
			printf("xdr_bool: decode FAILED\n");
#endif
			return (FALSE);
		}
		*bp = (lb == XDR_FALSE) ? FALSE : TRUE;
		return (TRUE);

	case XDR_FREE:
		return (TRUE);
	}
#ifdef KERNEL
	printf("xdr_bool: bad op FAILED\n");
#endif
	return (FALSE);
}

/*
 * XDR enumerations
 */
bool_t
xdr_enum(xdrs, ep)
	XDR *xdrs;
	enum_t *ep;
{
	enum sizecheck { SIZEVAL };	/* used to find the size of an enum */

	/*
	 * enums are treated as ints
	 */
#ifdef lint
	(void) (xdr_short(xdrs, (short *)ep));
	return (xdr_long(xdrs, (long *)ep));
#else
	if (sizeof (enum sizecheck) == sizeof (long)) {
		return (xdr_long(xdrs, (long *)ep));
	} else if (sizeof (enum sizecheck) == sizeof (short)) {
		return (xdr_short(xdrs, (short *)ep));
	} else {
		return (FALSE);
	}
#endif
}

/*
 * XDR opaque data
 * Allows the specification of a fixed size sequence of opaque bytes.
 * cp points to the opaque object and cnt gives the byte length.
 */
bool_t
xdr_opaque(xdrs, cp, cnt)
	register XDR *xdrs;
	caddr_t cp;
	register u_int cnt;
{
	register u_int rndup;
	static crud[BYTES_PER_XDR_UNIT];

	/*
	 * if no data we are done
	 */
	if (cnt == 0)
		return (TRUE);

	/*
	 * round byte count to full xdr units
	 */
	rndup = cnt % BYTES_PER_XDR_UNIT;
	if (rndup > 0)
		rndup = BYTES_PER_XDR_UNIT - rndup;

	if (xdrs->x_op == XDR_DECODE) {
		if (!XDR_GETBYTES(xdrs, cp, cnt)) {
#ifdef KERNEL
			printf("xdr_opaque: decode FAILED\n");
#endif
			return (FALSE);
		}
		if (rndup == 0)
			return (TRUE);
		return (XDR_GETBYTES(xdrs, crud, rndup));
	}

	if (xdrs->x_op == XDR_ENCODE) {
		if (!XDR_PUTBYTES(xdrs, cp, cnt)) {
#ifdef KERNEL
			printf("xdr_opaque: encode FAILED\n");
#endif
			return (FALSE);
		}
		if (rndup == 0)
			return (TRUE);
		return (XDR_PUTBYTES(xdrs, xdr_zero, rndup));
	}

	if (xdrs->x_op == XDR_FREE) {
		return (TRUE);
	}

#ifdef KERNEL
	printf("xdr_opaque: bad op FAILED\n");
#endif
	return (FALSE);
}

/*
 * XDR counted bytes
 * *cpp is a pointer to the bytes, *sizep is the count.
 * If *cpp is NULL maxsize bytes are allocated
 */
bool_t
xdr_bytes(xdrs, cpp, sizep, maxsize)
	register XDR *xdrs;
	char **cpp;
	register u_int *sizep;
	u_int maxsize;
{
	register char *sp = *cpp;  /* sp is the actual string pointer */
	register u_int nodesize;

	/*
	 * first deal with the length since xdr bytes are counted
	 */
	if (! xdr_u_int(xdrs, sizep)) {
#ifdef KERNEL
		printf("xdr_bytes: size FAILED\n");
#endif
		return (FALSE);
	}
	nodesize = *sizep;
	if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE)) {
#ifdef KERNEL
		printf("xdr_bytes: bad size FAILED\n");
#endif
		return (FALSE);
	}

	/*
	 * now deal with the actual bytes
	 */
	switch (xdrs->x_op) {

	case XDR_DECODE:
		if (sp == NULL) {
			*cpp = sp = (char *)mem_alloc(0, 0, nodesize, 0);
		}
#ifndef KERNEL
		if (sp == NULL) {
			fprintf(stderr, "xdr_bytes: out of memory\n");
			return (FALSE);
		}
#endif
		/* fall into ... */

	case XDR_ENCODE:
		return (xdr_opaque(xdrs, sp, nodesize));

	case XDR_FREE:
		if (sp != NULL) {
			mem_free(sp, nodesize);
			*cpp = NULL;
		}
		return (TRUE);
	}
#ifdef KERNEL
	printf("xdr_bytes: bad op FAILED\n");
#endif
	return (FALSE);
}

/*
 * Implemented here due to commonality of the object.
 */
bool_t
xdr_netobj(xdrs, np)
        XDR *xdrs;
        struct netobj *np;
{

        return (xdr_bytes(xdrs, &np->n_bytes, &np->n_len, MAX_NETOBJ_SZ));
}

/*
 * XDR a descriminated union
 * Support routine for discriminated unions.
 * You create an array of xdrdiscrim structures, terminated with
 * an entry with a null procedure pointer.  The routine gets
 * the discriminant value and then searches the array of xdrdiscrims
 * looking for that value.  It calls the procedure given in the xdrdiscrim
 * to handle the discriminant.  If there is no specific routine a default
 * routine may be called.
 * If there is no specific or default routine an error is returned.
 */
bool_t
xdr_union(xdrs, dscmp, unp, choices, dfault)
	register XDR *xdrs;
	enum_t *dscmp;		/* enum to decide which arm to work on */
	caddr_t unp;		/* the union itself */
	struct xdr_discrim *choices;	/* [value, xdr proc] for each arm */
	xdrproc_t dfault;	/* default xdr routine */
{
	register enum_t dscm;

	/*
	 * we deal with the discriminator;  it's an enum
	 */
	if (! xdr_enum(xdrs, dscmp)) {
#ifdef KERNEL
		printf("xdr_enum: dscmp FAILED\n");
#endif
		return (FALSE);
	}
	dscm = *dscmp;

	/*
	 * search choices for a value that matches the discriminator.
	 * if we find one, execute the xdr routine for that value.
	 */
	for (; choices->proc != NULL_xdrproc_t; choices++) {
		if (choices->value == dscm)
			return ((*(choices->proc))(xdrs, unp, LASTUNSIGNED));
	}

	/*
	 * no match - execute the default xdr routine if there is one
	 */
	return ((dfault == NULL_xdrproc_t) ? FALSE :
	    (*dfault)(xdrs, unp, LASTUNSIGNED));
}


/*
 * Non-portable xdr primitives.
 * Care should be taken when moving these routines to new architectures.
 */


/*
 * XDR null terminated ASCII strings
 * xdr_string deals with "C strings" - arrays of bytes that are
 * terminated by a NULL character.  The parameter cpp references a
 * pointer to storage; If the pointer is null, then the necessary
 * storage is allocated.  The last parameter is the max allowed length
 * of the string as specified by a protocol.
 */
bool_t
xdr_string(xdrs, cpp, maxsize)
	register XDR *xdrs;
	char **cpp;
	u_int maxsize;
{
	register char *sp = *cpp;  /* sp is the actual string pointer */
	u_int size;
	u_int nodesize;

	/*
	 * first deal with the length since xdr strings are counted-strings
	 */
	if ((xdrs->x_op) != XDR_DECODE)
		size = strlen(sp);
	if (! xdr_u_int(xdrs, &size)) {
#ifdef KERNEL
		printf("xdr_string: size FAILED\n");
#endif
		return (FALSE);
	}
	if (size > maxsize) {
#ifdef KERNEL
		printf("xdr_string: bad size FAILED\n");
#endif
		return (FALSE);
	}
	nodesize = size + 1;

	/*
	 * now deal with the actual bytes
	 */
	switch (xdrs->x_op) {

	case XDR_DECODE:
		if (sp == NULL)
			*cpp = sp = (char *)mem_alloc(0, 0, nodesize, 0);
#ifndef KERNEL
		if (sp == NULL) {
			fprintf(stderr, "xdr_string: out of memory\n");
			return (FALSE);
		}
#endif
		sp[size] = 0;
		/* fall into ... */

	case XDR_ENCODE:
		return (xdr_opaque(xdrs, sp, size));

	case XDR_FREE:
		if (sp != NULL) {
			mem_free(sp, nodesize);
			*cpp = NULL;
		}
		return (TRUE);
	}
#ifdef KERNEL
	printf("xdr_string: bad op FAILED\n");
#endif
	return (FALSE);
}

#ifndef KERNEL
/* 
 * Wrapper for xdr_string that can be called directly from 
 * routines like clnt_call
 */
bool_t
xdr_wrapstring(xdrs, cpp)
	XDR *xdrs;
	char **cpp;
{
	if (xdr_string(xdrs, cpp, BUFSIZ)) {
		return(TRUE);
	}
	return(FALSE);
}
#endif