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29 * @(#)xdr.c 1.35 87/08/12
30 * @(#)xdr.c 2.1 88/07/29 4.0 RPCSRC
31 * $NetBSD: xdr.c,v 1.22 2000/07/06 03:10:35 christos Exp $
32 * $FreeBSD: src/lib/libc/xdr/xdr.c,v 1.14 2004/10/16 06:32:43 obrien Exp $
33 * $DragonFly: src/lib/libc/xdr/xdr.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
37 * xdr.c, Generic XDR routines implementation.
39 * Copyright (C) 1986, Sun Microsystems, Inc.
41 * These are the "generic" xdr routines used to serialize and de-serialize
42 * most common data items. See xdr.h for more info on the interface to
46 #include "namespace.h"
52 #include <rpc/types.h>
54 #include "un-namespace.h"
56 typedef quad_t longlong_t; /* ANSI long long type */
57 typedef u_quad_t u_longlong_t; /* ANSI unsigned long long type */
60 * constants specific to the xdr "protocol"
62 #define XDR_FALSE ((long) 0)
63 #define XDR_TRUE ((long) 1)
64 #define LASTUNSIGNED ((u_int) 0-1)
69 static const char xdr_zero[BYTES_PER_XDR_UNIT] = { 0, 0, 0, 0 };
72 * Free a data structure using XDR
73 * Not a filter, but a convenient utility nonetheless
76 xdr_free(xdrproc_t proc, void *objp)
99 xdr_int(XDR *xdrs, int *ip)
103 switch (xdrs->x_op) {
107 return (XDR_PUTLONG(xdrs, &l));
110 if (!XDR_GETLONG(xdrs, &l)) {
124 * XDR unsigned integers
127 xdr_u_int(XDR *xdrs, u_int *up)
131 switch (xdrs->x_op) {
135 return (XDR_PUTLONG(xdrs, (long *)&l));
138 if (!XDR_GETLONG(xdrs, (long *)&l)) {
154 * same as xdr_u_long - open coded to save a proc call!
157 xdr_long(XDR *xdrs, long *lp)
159 switch (xdrs->x_op) {
161 return (XDR_PUTLONG(xdrs, lp));
163 return (XDR_GETLONG(xdrs, lp));
172 * XDR unsigned long integers
173 * same as xdr_long - open coded to save a proc call!
176 xdr_u_long(XDR *xdrs, u_long *ulp)
178 switch (xdrs->x_op) {
180 return (XDR_PUTLONG(xdrs, (long *)ulp));
182 return (XDR_GETLONG(xdrs, (long *)ulp));
192 * XDR 32-bit integers
193 * same as xdr_u_int32_t - open coded to save a proc call!
196 xdr_int32_t(XDR *xdrs, int32_t *int32_p)
200 switch (xdrs->x_op) {
204 return (XDR_PUTLONG(xdrs, &l));
207 if (!XDR_GETLONG(xdrs, &l)) {
210 *int32_p = (int32_t) l;
221 * XDR unsigned 32-bit integers
222 * same as xdr_int32_t - open coded to save a proc call!
225 xdr_u_int32_t(XDR *xdrs, u_int32_t *u_int32_p)
229 switch (xdrs->x_op) {
232 l = (u_long) *u_int32_p;
233 return (XDR_PUTLONG(xdrs, (long *)&l));
236 if (!XDR_GETLONG(xdrs, (long *)&l)) {
239 *u_int32_p = (u_int32_t) l;
254 xdr_short(XDR *xdrs, short *sp)
258 switch (xdrs->x_op) {
262 return (XDR_PUTLONG(xdrs, &l));
265 if (!XDR_GETLONG(xdrs, &l)) {
279 * XDR unsigned short integers
282 xdr_u_short(XDR *xdrs, u_short *usp)
286 switch (xdrs->x_op) {
290 return (XDR_PUTLONG(xdrs, (long *)&l));
293 if (!XDR_GETLONG(xdrs, (long *)&l)) {
308 * XDR 16-bit integers
311 xdr_int16_t(XDR *xdrs, int16_t *int16_p)
315 switch (xdrs->x_op) {
319 return (XDR_PUTLONG(xdrs, &l));
322 if (!XDR_GETLONG(xdrs, &l)) {
325 *int16_p = (int16_t) l;
336 * XDR unsigned 16-bit integers
339 xdr_u_int16_t(XDR *xdrs, u_int16_t *u_int16_p)
343 switch (xdrs->x_op) {
346 l = (u_long) *u_int16_p;
347 return (XDR_PUTLONG(xdrs, (long *)&l));
350 if (!XDR_GETLONG(xdrs, (long *)&l)) {
353 *u_int16_p = (u_int16_t) l;
368 xdr_char(XDR *xdrs, char *cp)
373 if (!xdr_int(xdrs, &i)) {
381 * XDR an unsigned char
384 xdr_u_char(XDR *xdrs, u_char *cp)
389 if (!xdr_u_int(xdrs, &u)) {
400 xdr_bool(XDR *xdrs, bool_t *bp)
404 switch (xdrs->x_op) {
407 lb = *bp ? XDR_TRUE : XDR_FALSE;
408 return (XDR_PUTLONG(xdrs, &lb));
411 if (!XDR_GETLONG(xdrs, &lb)) {
414 *bp = (lb == XDR_FALSE) ? FALSE : TRUE;
428 xdr_enum(XDR *xdrs, enum_t *ep)
430 enum sizecheck { SIZEVAL }; /* used to find the size of an enum */
433 * enums are treated as ints
435 /* LINTED */ if (sizeof (enum sizecheck) == sizeof (long)) {
436 return (xdr_long(xdrs, (long *)(void *)ep));
437 } else /* LINTED */ if (sizeof (enum sizecheck) == sizeof (int)) {
438 return (xdr_int(xdrs, (int *)(void *)ep));
439 } else /* LINTED */ if (sizeof (enum sizecheck) == sizeof (short)) {
440 return (xdr_short(xdrs, (short *)(void *)ep));
448 * Allows the specification of a fixed size sequence of opaque bytes.
449 * cp points to the opaque object and cnt gives the byte length.
452 xdr_opaque(XDR *xdrs, caddr_t cp, u_int cnt)
455 static int crud[BYTES_PER_XDR_UNIT];
458 * if no data we are done
464 * round byte count to full xdr units
466 rndup = cnt % BYTES_PER_XDR_UNIT;
468 rndup = BYTES_PER_XDR_UNIT - rndup;
470 if (xdrs->x_op == XDR_DECODE) {
471 if (!XDR_GETBYTES(xdrs, cp, cnt)) {
476 return (XDR_GETBYTES(xdrs, (caddr_t)(void *)crud, rndup));
479 if (xdrs->x_op == XDR_ENCODE) {
480 if (!XDR_PUTBYTES(xdrs, cp, cnt)) {
485 return (XDR_PUTBYTES(xdrs, xdr_zero, rndup));
488 if (xdrs->x_op == XDR_FREE) {
497 * *cpp is a pointer to the bytes, *sizep is the count.
498 * If *cpp is NULL maxsize bytes are allocated
501 xdr_bytes(XDR *xdrs, char **cpp, u_int *sizep, u_int maxsize)
503 char *sp = *cpp; /* sp is the actual string pointer */
507 * first deal with the length since xdr bytes are counted
509 if (! xdr_u_int(xdrs, sizep)) {
513 if ((nodesize > maxsize) && (xdrs->x_op != XDR_FREE)) {
518 * now deal with the actual bytes
520 switch (xdrs->x_op) {
527 *cpp = sp = mem_alloc(nodesize);
530 warnx("xdr_bytes: out of memory");
536 return (xdr_opaque(xdrs, sp, nodesize));
540 mem_free(sp, nodesize);
550 * Implemented here due to commonality of the object.
553 xdr_netobj(XDR *xdrs, struct netobj *np)
555 return (xdr_bytes(xdrs, &np->n_bytes, &np->n_len, MAX_NETOBJ_SZ));
559 * XDR a descriminated union
560 * Support routine for discriminated unions.
561 * You create an array of xdrdiscrim structures, terminated with
562 * an entry with a null procedure pointer. The routine gets
563 * the discriminant value and then searches the array of xdrdiscrims
564 * looking for that value. It calls the procedure given in the xdrdiscrim
565 * to handle the discriminant. If there is no specific routine a default
566 * routine may be called.
567 * If there is no specific or default routine an error is returned.
570 * dscmp: enum to decide which ar to work on
571 * unp: the union itself
572 * choices: [value, xdr proc] for each arm
573 * dfault: default xdr routine
576 xdr_union(XDR *xdrs, enum_t *dscmp, char *unp,
577 const struct xdr_discrim *choices, xdrproc_t dfault)
582 * we deal with the discriminator; it's an enum
584 if (! xdr_enum(xdrs, dscmp)) {
590 * search choices for a value that matches the discriminator.
591 * if we find one, execute the xdr routine for that value.
593 for (; choices->proc != NULL_xdrproc_t; choices++) {
594 if (choices->value == dscm)
595 return ((*(choices->proc))(xdrs, unp));
599 * no match - execute the default xdr routine if there is one
601 return ((dfault == NULL_xdrproc_t) ? FALSE :
602 (*dfault)(xdrs, unp));
607 * Non-portable xdr primitives.
608 * Care should be taken when moving these routines to new architectures.
613 * XDR null terminated ASCII strings
614 * xdr_string deals with "C strings" - arrays of bytes that are
615 * terminated by a NULL character. The parameter cpp references a
616 * pointer to storage; If the pointer is null, then the necessary
617 * storage is allocated. The last parameter is the max allowed length
618 * of the string as specified by a protocol.
621 xdr_string(XDR *xdrs, char **cpp, u_int maxsize)
623 char *sp = *cpp; /* sp is the actual string pointer */
628 * first deal with the length since xdr strings are counted-strings
630 switch (xdrs->x_op) {
633 return(TRUE); /* already free */
642 if (! xdr_u_int(xdrs, &size)) {
645 if (size > maxsize) {
651 * now deal with the actual bytes
653 switch (xdrs->x_op) {
660 *cpp = sp = mem_alloc(nodesize);
662 warnx("xdr_string: out of memory");
669 return (xdr_opaque(xdrs, sp, size));
672 mem_free(sp, nodesize);
681 * Wrapper for xdr_string that can be called directly from
682 * routines like clnt_call
685 xdr_wrapstring(XDR *xdrs, char **cpp)
687 return xdr_string(xdrs, cpp, LASTUNSIGNED);
691 * NOTE: xdr_hyper(), xdr_u_hyper(), xdr_longlong_t(), and xdr_u_longlong_t()
692 * are in the "non-portable" section because they require that a `long long'
695 * --thorpej@netbsd.org, November 30, 1999
699 * XDR 64-bit integers
702 xdr_int64_t(XDR *xdrs, int64_t *llp)
706 switch (xdrs->x_op) {
708 ul[0] = (u_long)((u_int64_t)*llp >> 32) & 0xffffffff;
709 ul[1] = (u_long)((u_int64_t)*llp) & 0xffffffff;
710 if (XDR_PUTLONG(xdrs, (long *)&ul[0]) == FALSE)
712 return (XDR_PUTLONG(xdrs, (long *)&ul[1]));
714 if (XDR_GETLONG(xdrs, (long *)&ul[0]) == FALSE)
716 if (XDR_GETLONG(xdrs, (long *)&ul[1]) == FALSE)
719 (((u_int64_t)ul[0] << 32) | ((u_int64_t)ul[1]));
730 * XDR unsigned 64-bit integers
733 xdr_u_int64_t(XDR *xdrs, u_int64_t *ullp)
737 switch (xdrs->x_op) {
739 ul[0] = (u_long)(*ullp >> 32) & 0xffffffff;
740 ul[1] = (u_long)(*ullp) & 0xffffffff;
741 if (XDR_PUTLONG(xdrs, (long *)&ul[0]) == FALSE)
743 return (XDR_PUTLONG(xdrs, (long *)&ul[1]));
745 if (XDR_GETLONG(xdrs, (long *)&ul[0]) == FALSE)
747 if (XDR_GETLONG(xdrs, (long *)&ul[1]) == FALSE)
750 (((u_int64_t)ul[0] << 32) | ((u_int64_t)ul[1]));
764 xdr_hyper(XDR *xdrs, longlong_t *llp)
768 * Don't bother open-coding this; it's a fair amount of code. Just
769 * call xdr_int64_t().
771 return (xdr_int64_t(xdrs, (int64_t *)llp));
776 * XDR unsigned hypers
779 xdr_u_hyper(XDR *xdrs, u_longlong_t *ullp)
783 * Don't bother open-coding this; it's a fair amount of code. Just
784 * call xdr_u_int64_t().
786 return (xdr_u_int64_t(xdrs, (u_int64_t *)ullp));
794 xdr_longlong_t(XDR *xdrs, longlong_t *llp)
798 * Don't bother open-coding this; it's a fair amount of code. Just
799 * call xdr_int64_t().
801 return (xdr_int64_t(xdrs, (int64_t *)llp));
809 xdr_u_longlong_t(XDR *xdrs, u_longlong_t *ullp)
813 * Don't bother open-coding this; it's a fair amount of code. Just
814 * call xdr_u_int64_t().
816 return (xdr_u_int64_t(xdrs, (u_int64_t *)ullp));