xdr_sizeof.c revision 256281
1/* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29/* 30 * xdr_sizeof.c 31 * 32 * Copyright 1990 Sun Microsystems, Inc. 33 * 34 * General purpose routine to see how much space something will use 35 * when serialized using XDR. 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: stable/10/sys/xdr/xdr_sizeof.c 177633 2008-03-26 15:23:12Z dfr $"); 40 41#include <sys/param.h> 42#include <sys/systm.h> 43#include <sys/malloc.h> 44 45#include <rpc/types.h> 46#include <rpc/xdr.h> 47 48/* ARGSUSED */ 49static bool_t 50x_putlong(XDR *xdrs, const long *longp) 51{ 52 53 xdrs->x_handy += BYTES_PER_XDR_UNIT; 54 return (TRUE); 55} 56 57/* ARGSUSED */ 58static bool_t 59x_putbytes(XDR *xdrs, const char *bp, u_int len) 60{ 61 62 xdrs->x_handy += len; 63 return (TRUE); 64} 65 66static u_int 67x_getpostn(XDR *xdrs) 68{ 69 70 return (xdrs->x_handy); 71} 72 73/* ARGSUSED */ 74static bool_t 75x_setpostn(XDR *xdrs, u_int pos) 76{ 77 78 /* This is not allowed */ 79 return (FALSE); 80} 81 82static int32_t * 83x_inline(XDR *xdrs, u_int len) 84{ 85 86 if (len == 0) { 87 return (NULL); 88 } 89 if (xdrs->x_op != XDR_ENCODE) { 90 return (NULL); 91 } 92 if (len < (u_int)(uintptr_t)xdrs->x_base) { 93 /* x_private was already allocated */ 94 xdrs->x_handy += len; 95 return ((int32_t *) xdrs->x_private); 96 } else { 97 /* Free the earlier space and allocate new area */ 98 if (xdrs->x_private) 99 free(xdrs->x_private, M_RPC); 100 if ((xdrs->x_private = (caddr_t) malloc(len, M_RPC, M_WAITOK)) == NULL) { 101 xdrs->x_base = 0; 102 return (NULL); 103 } 104 xdrs->x_base = (caddr_t)(uintptr_t) len; 105 xdrs->x_handy += len; 106 return ((int32_t *) xdrs->x_private); 107 } 108} 109 110static int 111harmless(void) 112{ 113 114 /* Always return FALSE/NULL, as the case may be */ 115 return (0); 116} 117 118static void 119x_destroy(XDR *xdrs) 120{ 121 122 xdrs->x_handy = 0; 123 xdrs->x_base = 0; 124 if (xdrs->x_private) { 125 free(xdrs->x_private, M_RPC); 126 xdrs->x_private = NULL; 127 } 128 return; 129} 130 131unsigned long 132xdr_sizeof(xdrproc_t func, void *data) 133{ 134 XDR x; 135 struct xdr_ops ops; 136 bool_t stat; 137 /* to stop ANSI-C compiler from complaining */ 138 typedef bool_t (* dummyfunc1)(XDR *, long *); 139 typedef bool_t (* dummyfunc2)(XDR *, caddr_t, u_int); 140 141 ops.x_putlong = x_putlong; 142 ops.x_putbytes = x_putbytes; 143 ops.x_inline = x_inline; 144 ops.x_getpostn = x_getpostn; 145 ops.x_setpostn = x_setpostn; 146 ops.x_destroy = x_destroy; 147 148 /* the other harmless ones */ 149 ops.x_getlong = (dummyfunc1) harmless; 150 ops.x_getbytes = (dummyfunc2) harmless; 151 152 x.x_op = XDR_ENCODE; 153 x.x_ops = &ops; 154 x.x_handy = 0; 155 x.x_private = (caddr_t) NULL; 156 x.x_base = (caddr_t) 0; 157 158 stat = func(&x, data); 159 if (x.x_private) 160 free(x.x_private, M_RPC); 161 return (stat == TRUE ? (unsigned) x.x_handy: 0); 162} 163