1 /* $NetBSD: xdr_array.c,v 1.12 2000/01/22 22:19:18 mycroft Exp $ */ 2 3 /*- 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *sccsid2 = "@(#)xdr_array.c 1.10 87/08/11 Copyr 1984 Sun Micro"; 36 static char *sccsid = "@(#)xdr_array.c 2.1 88/07/29 4.0 RPCSRC"; 37 #endif 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 /* 42 * xdr_array.c, Generic XDR routines impelmentation. 43 * 44 * These are the "non-trivial" xdr primitives used to serialize and de-serialize 45 * arrays. See xdr.h for more info on the interface to xdr. 46 */ 47 48 #include "namespace.h" 49 #include <err.h> 50 #include <limits.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include <rpc/types.h> 56 #include <rpc/xdr.h> 57 #include "un-namespace.h" 58 59 /* 60 * XDR an array of arbitrary elements 61 * *addrp is a pointer to the array, *sizep is the number of elements. 62 * If addrp is NULL (*sizep * elsize) bytes are allocated. 63 * elsize is the size (in bytes) of each element, and elproc is the 64 * xdr procedure to call to handle each element of the array. 65 */ 66 bool_t 67 xdr_array(xdrs, addrp, sizep, maxsize, elsize, elproc) 68 XDR *xdrs; 69 caddr_t *addrp; /* array pointer */ 70 u_int *sizep; /* number of elements */ 71 u_int maxsize; /* max numberof elements */ 72 u_int elsize; /* size in bytes of each element */ 73 xdrproc_t elproc; /* xdr routine to handle each element */ 74 { 75 u_int i; 76 caddr_t target = *addrp; 77 u_int c; /* the actual element count */ 78 bool_t stat = TRUE; 79 u_int nodesize; 80 81 /* like strings, arrays are really counted arrays */ 82 if (!xdr_u_int(xdrs, sizep)) { 83 return (FALSE); 84 } 85 c = *sizep; 86 if ((c > maxsize || UINT_MAX/elsize < c) && 87 (xdrs->x_op != XDR_FREE)) { 88 return (FALSE); 89 } 90 nodesize = c * elsize; 91 92 /* 93 * if we are deserializing, we may need to allocate an array. 94 * We also save time by checking for a null array if we are freeing. 95 */ 96 if (target == NULL) 97 switch (xdrs->x_op) { 98 case XDR_DECODE: 99 if (c == 0) 100 return (TRUE); 101 *addrp = target = mem_alloc(nodesize); 102 if (target == NULL) { 103 warnx("xdr_array: out of memory"); 104 return (FALSE); 105 } 106 memset(target, 0, nodesize); 107 break; 108 109 case XDR_FREE: 110 return (TRUE); 111 112 case XDR_ENCODE: 113 break; 114 } 115 116 /* 117 * now we xdr each element of array 118 */ 119 for (i = 0; (i < c) && stat; i++) { 120 stat = (*elproc)(xdrs, target); 121 target += elsize; 122 } 123 124 /* 125 * the array may need freeing 126 */ 127 if (xdrs->x_op == XDR_FREE) { 128 mem_free(*addrp, nodesize); 129 *addrp = NULL; 130 } 131 return (stat); 132 } 133 134 /* 135 * xdr_vector(): 136 * 137 * XDR a fixed length array. Unlike variable-length arrays, 138 * the storage of fixed length arrays is static and unfreeable. 139 * > basep: base of the array 140 * > size: size of the array 141 * > elemsize: size of each element 142 * > xdr_elem: routine to XDR each element 143 */ 144 bool_t 145 xdr_vector(xdrs, basep, nelem, elemsize, xdr_elem) 146 XDR *xdrs; 147 char *basep; 148 u_int nelem; 149 u_int elemsize; 150 xdrproc_t xdr_elem; 151 { 152 u_int i; 153 char *elptr; 154 155 elptr = basep; 156 for (i = 0; i < nelem; i++) { 157 if (!(*xdr_elem)(xdrs, elptr)) { 158 return(FALSE); 159 } 160 elptr += elemsize; 161 } 162 return(TRUE); 163 } 164